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Zhu, Bin
Publications (10 of 13) Show all publications
Ali, A., Raza, R., Kaleem Ullah, M., Rafique, A., Wang, B. & Zhu, B. (2018). Alkaline earth metal and samarium co-doped ceria as efficient electrolytes. Applied Physics Letters, 112(4), Article ID 043902.
Open this publication in new window or tab >>Alkaline earth metal and samarium co-doped ceria as efficient electrolytes
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2018 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, no 4, article id 043902Article in journal (Refereed) Published
Abstract [en]

Co-doped ceramic electrolytes M0.1Sm0.1Ce0.8O2-δ (M = Ba, Ca, Mg, and Sr) were synthesized via co-precipitation. The focus of this study was to highlight the effects of alkaline earth metals in doped ceria on the microstructure, densification, conductivity, and performance. The ionic conductivity comparisons of prepared electrolytes in the air atmosphere were studied. It has been observed that Ca0.1Sm0.1Ce0.8O2-δ shows the highest conductivity of 0.124 Scm-1 at 650 °C and a lower activation energy of 0.48 eV. The cell shows a maximum power density of 630 mW cm-2 at 650 °C using hydrogen fuel. The enhancement in conductivity and performance was due to increasing the oxygen vacancies in the ceria lattice with the increasing dopant concentration. The bandgap was calculated from UV-Vis data, which shows a red shift when compared with pure ceria. The average crystallite size is in the range of 37-49 nm. DFT was used to analyze the co-doping structure, and the calculated lattice parameter was compared with the experimental lattice parameter.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-222299 (URN)10.1063/1.5005824 (DOI)000423724300048 ()2-s2.0-85041125633 (Scopus ID)
Note

QC 20180206

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-22Bibliographically approved
Fan, L., Zhu, B., Su, P.-C. & He, C. (2018). Nanomaterials and technologies for low temperature solid oxide fuel cells: Recent advances, challenges and opportunities. Nano Energy, 45, 148-176
Open this publication in new window or tab >>Nanomaterials and technologies for low temperature solid oxide fuel cells: Recent advances, challenges and opportunities
2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 45, p. 148-176Article, review/survey (Refereed) Published
Abstract [en]

Solid oxide fuel cells (SOFCs) show considerable promise for meeting the current ever-increasing energy demand and environmental sustainability requirements because of their high efficiency, low environmental impact, and distinct fuel diversity. In the past few decades, extensive R&D efforts have been focused on lowering operational temperatures in order to decrease the system (stack and balance-of-plant) cost and improve the longevity of operationally useful devices of commercial relevance. Nanomaterials and related nanotechnologies have the potential to improve SOFC performance because of their advantageous functionalities, namely, their enlarged surface area and unique surface and interface properties compared to their microscale analogs. Recently, the use of nanomaterials has increased rapidly, as reflected by the exponential growth in the number of publications since 2002. In this work, we present a comprehensive summary of nanoparticles, nano-thin films and nanocomposites with different crystal phases, morphologies, microstructures, electronic properties, and electrochemical performances for low temperature SOFCs (LT-SOFCs), with focus on efforts to enhance electrical efficiency, to induce novel fundamental properties that are inaccessible in microcrystalline materials, and to promote the commercialization of LT-SOFCs. Recent progress in the applications of many classically or newly chemical and physical nanomaterials and nanofabrication techniques, such as thin film vacuum deposition, impregnation, electrospinning, spark plasma sintering, hard-and soft-template methods, and in-situ nanoparticle surface exsolution are also thoroughly described. The technological and scientific advantages and limitations related to the use of nanomaterials and nanotechnologies are highlighted, along with our expectations for future research within this emerging field.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keywords
Low temperature solid oxide fuel cells, Nanomaterials and nanotechnology, Nanoionics, Nanocomposite
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-224020 (URN)10.1016/j.nanoen.2017.12.044 (DOI)000425396400018 ()2-s2.0-85039868017 (Scopus ID)
Note

QC 20180323

Available from: 2018-03-23 Created: 2018-03-23 Last updated: 2018-03-23Bibliographically approved
Mushtaq, N., Xia, C., Dong, W., Abbas, G., Raza, R., Ali, A., . . . Zhu, B. (2018). Perovskite SrFe1-xTixO3-δ (x < = 0.1) cathode for low temperature solid oxide fuel cell. Ceramics International, 44(9), 10266-10272
Open this publication in new window or tab >>Perovskite SrFe1-xTixO3-δ (x < = 0.1) cathode for low temperature solid oxide fuel cell
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2018 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 44, no 9, p. 10266-10272Article in journal (Refereed) Published
Abstract [en]

Stable and compatible cathode materials are a key factor for realizing the low-temperature (LT, ≤600 °C) operation and practical implementations of solid oxide fuel cells (SOFCs). In this study, perovskite oxides SrFe1-xTixO3-δ (x &lt; = 0.1), with various ratios of Ti doping, are prepared by a sol-gel method for cathode material for LT-SOFCs. The structure, morphology and thermo-gravimetric characteristics of the resultant SFT powders are investigated. It is found that the Ti is successfully doped into SrFeO3-δ to form a single phase cubic perovskite structure and crystal structure of SFT shows better stability than SrFeO3-δ. The dc electrical conductivity and electrochemical properties of SFT are measured and analysed by four-probe and electrochemical impedance spectra (EIS) measurements, respectively. The obtained SFT exhibits a very low polarization resistance (Rp),.01 Ωcm2 at 600◦C. The SFT powders using as cathode in fuel cell devices, exhibit maximum power density of 551 mW cm−2 with open circuit voltage (OCV) of 1.15 V at 600◦C. The good performance of the SFT cathode indicates a high rate of oxygen diffusion through the material at cathode. By enabling operation at low temperatures, SFT cathodes may result in a practical implementation of SOFCs.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Low polarization resistance, LT-SOFCs, Material stability, Perovskite cathode, Power density, SrFeTiO3-δ
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-227539 (URN)10.1016/j.ceramint.2018.03.033 (DOI)000431470200033 ()2-s2.0-85043990545 (Scopus ID)
Note

QC 20180518

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-12-14Bibliographically approved
Khan, M. A., Xu, C., Song, Z., Raza, R., Ahmad, M. A., Abbas, G. & Zhu, B. (2018). Synthesize and characterization of ceria based nano-composite materials for low temperature solid oxide fuel cell. International journal of hydrogen energy, 43(12), 6310-6317
Open this publication in new window or tab >>Synthesize and characterization of ceria based nano-composite materials for low temperature solid oxide fuel cell
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2018 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 43, no 12, p. 6310-6317Article in journal (Refereed) Published
Abstract [en]

The present study is focused on ceria based mixed (ionic and electronic conductor) composite Al0.05Ni0.1Ti0.05Zn0.80-SDC (ATZN-SDC) oxide material was prepared by solid state reaction, which can be used as anode materials for solid oxide fuel cell. The effect of Ti and Al oxides were analyzed on the NiZn-SDC composite with respect to its conductivity and catalytic activity in hydrogen atmosphere. The average crystallite size of the composite was found to be 40-100 nm by XRD and SEM. The DC conductivity was determined by 4-probe technique. The electrochemical impedance spectrum (EIS) was also examined in hydrogen atmosphere within a temperature range of 350-550 degrees C. The maximum power density 370 mW/cm(2) was achieved at 650 degrees C.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2018
Keywords
Nanocomposite anode, Nanostructure, Non-symmetrical fuel cell, LTSOFC, NiZn-SDC composite
National Category
Ceramics
Identifiers
urn:nbn:se:kth:diva-228160 (URN)10.1016/j.ijhydene.2018.01.166 (DOI)000428823900030 ()2-s2.0-85042452962 (Scopus ID)
Note

QC 20180522

Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-05-22Bibliographically approved
Liu, L., Liu, Y., Li, L., Wu, Y., Singh, M. & Zhu, B. (2018). The composite electrolyte with an insulation Sm2O3 and semiconductor NiO for advanced fuel cells. Paper presented at Forum of Hydrogen and Fuel Cells, DEC 11-13, 2017, Hubei Univ, Wuhan, PEOPLES R CHINA. International journal of hydrogen energy, 43(28), 12739-12747
Open this publication in new window or tab >>The composite electrolyte with an insulation Sm2O3 and semiconductor NiO for advanced fuel cells
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2018 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 43, no 28, p. 12739-12747Article in journal (Refereed) Published
Abstract [en]

Novel Sm2O3-NiO composite was prepared as the functional electrolyte for the first time. The total electrical conductivity of Sm2O3-NiO is 0.38 S cm(-1) in H-2/air condition at 550 degrees C. High performance, e.g. 718 mW cm(-2), was achieved using Sm2O3-NiO composite as an electrolyte of solid oxide fuel cells operated at 550 degrees C. The electrical properties and electrochemical performance are strongly depended on Sm2O3 and NiO constituent phase of the compositions. Notably, surprisingly high ionic conductivity and fuel cell performance are achieved using the composite system constituting with insulating Sm2O3 and intrinsic p-type conductive NiO with a low conductivity of 4 x 10(-3) S cm(-1). The interfacial ionic conduction between two phases is a dominating factor giving rise to significantly enhanced proton conduction. Fuel cell performance and further ionic conduction mechanisms are under investigation.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Sm2O3-NiO, Composite electrolyte, Proton conduction, Interfacial ionic conduction, Semiconductor-ionic fuel cells
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-240211 (URN)10.1016/j.ijhydene.2018.03.184 (DOI)000439678700019 ()2-s2.0-85046168913 (Scopus ID)
Conference
Forum of Hydrogen and Fuel Cells, DEC 11-13, 2017, Hubei Univ, Wuhan, PEOPLES R CHINA
Note

QC 20181218

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved
Feng, C., Wang, B., Zhu, J., Wang, H. & Zhu, B. (2018). Thin-Film Fuel Cells using a Sodium Silicate Binder with La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) and LaCePr Oxides (LCP) Membranes. Energy Technology, 6(2), 312-317
Open this publication in new window or tab >>Thin-Film Fuel Cells using a Sodium Silicate Binder with La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) and LaCePr Oxides (LCP) Membranes
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2018 (English)In: Energy Technology, ISSN 2194-4288, Vol. 6, no 2, p. 312-317Article in journal (Refereed) Published
Abstract [en]

Sodium silicate was used as a binder to prepare LaCePr oxides (LCP) and La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) thin films on a Ni0.8Co0.15Al0.05Li oxide ceramic substrate for the first time. The microstructure, morphology, and electrical properties of the LSCF-LCP thin films were characterized and investigated by using XRD, SEM, energy-dispersive X-ray spectroscopy, and electrochemical impedance spectroscopy. The film sintered at 600 degrees C presents promising density and has been successfully applied as the electrolyte membrane for solid-oxide fuel cells (SOFCs). Such a device achieved a respectable electrochemical performance with an open-circuit voltage of 1.04V and a maximum power output of 545mWcm(-2) at 575 degrees C. These findings suggest that sodium silicate is a suitable binder for the preparation of dense thin-film membranes for SOFCs. Moreover, the preparation technology based on sodium silicate eliminated degumming and high-temperature sintering, which resulted in greatly simplifying the preparation process of the thin-film fuel cell towards potential fuel cell commercialization.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2018
Keywords
electrochemistry, membranes, rare earths, silicon, thin films
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-240184 (URN)10.1002/ente.201700469 (DOI)000424795100015 ()2-s2.0-85040242331 (Scopus ID)
Funder
Swedish Research Council, 621-2011-4983EU, FP7, Seventh Framework Programme, 303454
Note

QC 20181218

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved
Cai, Y., Xia, C., Wang, B., Zhang, W., Wang, Y. & Zhu, B. (2017). Bioderived Calcite as Electrolyte for Solid Oxide Fuel Cells: A Strategy toward Utilization of Waste Shells. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 5(11), 10387-10395
Open this publication in new window or tab >>Bioderived Calcite as Electrolyte for Solid Oxide Fuel Cells: A Strategy toward Utilization of Waste Shells
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2017 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 5, no 11, p. 10387-10395Article in journal (Refereed) Published
Abstract [en]

The excessive consumption of synthesized materials and enhanced environmental protection protocols necessitate the exploitation of desirable functionalities to handle our solid waste. Through a simple calcination and composite strategy, this work envisages the first application of biocalcite derived from the waste of crayfish shells as an electrolyte for solid oxide fuel cells (SOFCs), which demonstrates encouraging performances within a low temperature range of 450-550 degrees C. The single cell device, assembled from calcined waste shells at 600 degrees C (CWS600), enables a peak power density of 166 mW cm(-2) at 550 degrees C, and further renders 330 and 256 mW cm(-2) after compositing with perovskite La0.6Sr0.4Co0.8Fe0.2O3-delta (LSCF) and layer-structured LiNi0.8Co0.15Al0.05O2 (LNCA), respectively. Notably, an oxygen-ion blocking fuel cell is used to confirm the proton-conducting property of CWS600 associated electrolytes. The practical potential of the prepared fuel cells is also validated when the cell voltage of the cell is kept constant value over 10 h during a galvanostatic operation using a CWS600-LSCF electrolyte. These interesting findings may increase the likelihood of transforming our solid municipal waste into electrochemical energy devices, and also importantly, provide an underlying approach for discovering novel electrolytes for low-temperature SOFCs.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-218219 (URN)10.1021/acssuschemeng.7b02406 (DOI)000414825900096 ()2-s2.0-85033476257 (Scopus ID)
Note

QC 20171128

Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2018-06-19Bibliographically approved
Zhu, B., Hedman, A. & Li, H. (2017). Designing Digital Mindfulness: Presence-In and Presence-With versus Presence-Through. In: PROCEEDINGS OF THE 2017 ACM SIGCHI CONFERENCE ON HUMAN FACTORS IN COMPUTING SYSTEMS (CHI'17): . Paper presented at THE 2017 ACM SIGCHI CONFERENCE ON HUMAN FACTORS IN COMPUTING SYSTEMS (CHI'17) (pp. 2685-2695). ASSOC COMPUTING MACHINERY
Open this publication in new window or tab >>Designing Digital Mindfulness: Presence-In and Presence-With versus Presence-Through
2017 (English)In: PROCEEDINGS OF THE 2017 ACM SIGCHI CONFERENCE ON HUMAN FACTORS IN COMPUTING SYSTEMS (CHI'17), ASSOC COMPUTING MACHINERY , 2017, p. 2685-2695Conference paper, Published paper (Refereed)
Abstract [en]

The digital health and wellbeing movement has led to development of digital mindfulness applications that aim to help people to become mindful. In this paper we suggest a broad scheme for classifying and ordering apps intended to support mindfulness. This scheme consists of four levels of what we here term digital mindfulness. One crucial aspect of the fourth level is that artifacts at this level allow for what we term as presence-with and presence-in as opposed to presence-through, which occurs at the first three levels. We articulate our four levels along with specific design qualities through concrete examples of existing mindfulness apps and through research through design (RtD) work conducted with design fiction examples. We then use a working design case prototype to further illustrate the possibilities of presence-with and presence-in. We hope our four levels of digital mindfulness framework will be found useful by other researchers in discussing and planning the design of their own mindfulness apps and digital artifacts.

Place, publisher, year, edition, pages
ASSOC COMPUTING MACHINERY, 2017
Keywords
Digital mindfulness, design, presence, interaction, wellbeing, attention, awareness, being, research through design, aesthetics
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-225813 (URN)10.1145/3025453.3025590 (DOI)000426970502061 ()
Conference
THE 2017 ACM SIGCHI CONFERENCE ON HUMAN FACTORS IN COMPUTING SYSTEMS (CHI'17)
Note

QC 20180409

Available from: 2018-04-09 Created: 2018-04-09 Last updated: 2018-04-09Bibliographically approved
Zhu, B., Hedman, A., Feng, S., Li, H. & Osika, W. (2017). Designing, Prototyping and Evaluating Digital Mindfulness Applications: A Case Study of Mindful Breathing for Stress Reduction. Journal of Medical Internet Research, 19(6), Article ID e197.
Open this publication in new window or tab >>Designing, Prototyping and Evaluating Digital Mindfulness Applications: A Case Study of Mindful Breathing for Stress Reduction
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2017 (English)In: Journal of Medical Internet Research, ISSN 1438-8871, E-ISSN 1438-8871, Vol. 19, no 6, article id e197Article in journal (Refereed) Published
Abstract [en]

Background: During the past decade, there has been a rapid increase of interactive apps designed for health and well-being. Yet, little research has been published on developing frameworks for design and evaluation of digital mindfulness facilitating technologies. Moreover, many existing digital mindfulness applications are purely software based. There is room for further exploration and assessment of designs that make more use of physical qualities of artifacts. Objective: The study aimed to develop and test a new physical digital mindfulness prototype designed for stress reduction. Methods: In this case study, we designed, developed, and evaluated HU, a physical digital mindfulness prototype designed for stress reduction. In the first phase, we used vapor and light to support mindful breathing and invited 25 participants through snowball sampling to test HU. In the second phase, we added sonification. We deployed a package of probes such as photos, diaries, and cards to collect data from users who explored HU in their homes. Thereafter, we evaluated our installation using both self-assessed stress levels and heart rate (HR) and heart rate variability (HRV) measures in a pilot study, in order to measure stress resilience effects. After the experiment, we performed a semistructured interview to reflect on HU and investigate the design of digital mindfulness apps for stress reduction. Results: The results of the first phase showed that 22 of 25 participants (88%) claimed vapor and light could be effective ways of promoting mindful breathing. Vapor could potentially support mindful breathing better than light (especially for mindfulness beginners). In addition, a majority of the participants mentioned sound as an alternative medium. In the second phase, we found that participants thought that HU could work well for stress reduction. We compared the effect of silent HU (using light and vapor without sound) and sonified HU on 5 participants. Subjective stress levels were statistically improved with both silent and sonified HU. The mean value of HR using silent HU was significantly lower than resting baseline and sonified HU. The mean value of root mean square of differences (RMSSD) using silent HU was significantly higher than resting baseline. We found that the differences between our objective and subjective assessments were intriguing and prompted us to investigate them further. Conclusions: Our evaluation of HU indicated that HU could facilitate relaxed breathing and stress reduction. There was a difference in outcome between the physiological measures of stress and the subjective reports of stress, as well as a large intervariability among study participants. Our conclusion is that the use of stress reduction tools should be customized and that the design work of mindfulness technology for stress reduction is a complex process, which requires cooperation of designers, HCI (Human-Computer Interaction) experts and clinicians.

Place, publisher, year, edition, pages
JMIR PUBLICATIONS, INC, 2017
Keywords
respiration, biofeedback, mindfulness, stress, device design, sound, light, breathing, heart rate, relaxation
National Category
Health Sciences
Identifiers
urn:nbn:se:kth:diva-213815 (URN)10.2196/jmir.6955 (DOI)000408350400001 ()28615157 (PubMedID)2-s2.0-85021836442 (Scopus ID)
Note

QC 20170911

Available from: 2017-09-11 Created: 2017-09-11 Last updated: 2017-11-29Bibliographically approved
Chen, J., Zhu, B., Bälter, O., Xu, J., Zou, W., Hedman, A., . . . Sang, M. (2017). FishBuddy: Promoting Student Engagement in Self-Paced Learning through Wearable Sensing. In: 2017 IEEE INTERNATIONAL CONFERENCE ON SMART COMPUTING (SMARTCOMP): . Paper presented at IEEE International Conference on Smart Computing (SMARTCOMP), MAY 29-31, 2017, Hong Kong, PEOPLES R CHINA (pp. 211-219). IEEE
Open this publication in new window or tab >>FishBuddy: Promoting Student Engagement in Self-Paced Learning through Wearable Sensing
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2017 (English)In: 2017 IEEE INTERNATIONAL CONFERENCE ON SMART COMPUTING (SMARTCOMP), IEEE , 2017, p. 211-219Conference paper, Published paper (Refereed)
Abstract [en]

Student engagement is crucial for successful self-paced learning. Feeling isolated during self-paced learning with neither adequate supervision nor intervention by teachers may cause negative emotions such as anxiety. Such emotions may in turn significantly weaken students' motivation to engage in learning activities. In this paper, we develop a self-paced learning environment (FishBuddy) that aims to reduce anxiety and promote student engagement. We construct and implement a physiologically-state-aware performance-evaluation model for identifying potentially fruitful moments of intervention when students show frustration during learning activities using an Apple Watch application that measures heart rate and alerts the student to watch a visualization of his or her own physiological state. We have conducted an experiment with 20 first-year undergraduate students, randomly separated into an experimental group and a control group, who carry out online, self-paced English grammar exercises. The students in the experimental group used FishBuddy and those in the control group did not. The self-reports from both groups show that FishBuddy significantly reduced reported experiences of anxiety and isolation in the experiment. Further to this, students who used FishBuddy were engaged longer with the exercises. The average scores on the exercises between the two groups, however, were not significantly different.

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
Wearable Sensing, Student Engagement, Self-paced Learning, Learning Intervention
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:kth:diva-215861 (URN)000411757300029 ()2-s2.0-85022337346 (Scopus ID)978-1-5090-6517-2 (ISBN)
Conference
IEEE International Conference on Smart Computing (SMARTCOMP), MAY 29-31, 2017, Hong Kong, PEOPLES R CHINA
Note

QC 20171016

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2018-01-13Bibliographically approved
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