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Publications (10 of 471) Show all publications
Zhang, L., Yang, X., Wang, W., Gurzadyan, G. G., Li, J., Li, X., . . . Sun, L. (2019). 13.6% Efficient Organic Dye-Sensitized Solar Cells by Minimizing Energy Losses of the Excited State. ACS ENERGY LETTERS, 4(4), 943-951
Open this publication in new window or tab >>13.6% Efficient Organic Dye-Sensitized Solar Cells by Minimizing Energy Losses of the Excited State
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2019 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 4, no 4, p. 943-951Article in journal (Refereed) Published
Abstract [en]

The electron-injection energy losses of dye-sensitized solar cells (DSSCs) are among the fundamental problems hindering their successful breakthrough application. Two triazatruxene (TAT)-based sensitizers, with one containing a flexible Z-type double bond and another a rigid single bond, coded as ZL001 and ZL003, respectively, have been synthesized and applied in DSSCs to probe the energy losses in the process of electron injection. Using time-resolved laser spectroscopic techniques in the kinetic study, ZL003 with the rigid single bond promotes much faster electron injection into the conductive band of TiO2 especially in the locally excited state (hot injection), which leads to higher electron density in TiO2 and a higher V-oc. The devices based on ZL003 exhibited a champion power conversion efficiency (PCE) of 13.6% with V-oc = 956 mV, J(sc) = 20.73 mA cm(-2), and FF = 68.5%, which are among the highest recorded results to date on single dye-sensitized DSSCs. An independent certified PCE of 12.4% has been obtained for devices based on ZL003.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-251335 (URN)10.1021/acsenergylett.9b00141 (DOI)000464889300021 ()2-s2.0-85064383453 (Scopus ID)
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically approved
Zhang, B. & Sun, L. (2019). Artificial photosynthesis: opportunities and challenges of molecular catalysts. Chemical Society Reviews, 48(7), 2216-2264
Open this publication in new window or tab >>Artificial photosynthesis: opportunities and challenges of molecular catalysts
2019 (English)In: Chemical Society Reviews, ISSN 0306-0012, E-ISSN 1460-4744, Vol. 48, no 7, p. 2216-2264Article, review/survey (Refereed) Published
Abstract [en]

Molecular catalysis plays an essential role in both natural and artificial photosynthesis (AP). However, the field of molecular catalysis for AP has gradually declined in recent years because of doubt about the long-term stability of molecular-catalyst-based devices. This review summarizes the development history of molecular-catalyst-based AP, including the fundamentals of AP, molecular catalysts for water oxidation, proton reduction and CO2 reduction, and molecular-catalyst-based AP devices, and it provides an analysis of the advantages, challenges, and stability of molecular catalysts. With this review, we aim to highlight the following points: (i) an investigation on molecular catalysis is one of the most promising ways to obtain atom-efficient catalysts with outstanding intrinsic activities; (ii) effective heterogenization of molecular catalysts is currently the primary challenge for the application of molecular catalysis in AP devices; (iii) development of molecular catalysts is a promising way to solve the problems of catalysis involved in practical solar fuel production. In molecular-catalysis-based AP, much has been attained, but more challenges remain with regard to long-term stability and heterogenization techniques.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-251498 (URN)10.1039/c8cs00897c (DOI)000464383500009 ()30895997 (PubMedID)2-s2.0-85063728666 (Scopus ID)
Note

QC 20190516

Available from: 2019-05-16 Created: 2019-05-16 Last updated: 2019-05-16Bibliographically approved
Guo, Y., Yao, Z., Timmer, B. J. J., Sheng, X., Fan, L., Li, Y., . . . Sun, L. (2019). Boosting nitrogen reduction reaction by bio-inspired FeMoS containing hybrid electrocatalyst over a wide pH range. Nano Energy, 62, 282-288
Open this publication in new window or tab >>Boosting nitrogen reduction reaction by bio-inspired FeMoS containing hybrid electrocatalyst over a wide pH range
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 62, p. 282-288Article in journal (Refereed) Published
Abstract [en]

A facile preparation of bio-inspired and morphology controllable catalytic electrode FeS@MoS2/CFC, featuring a carbon fiber cloth (CFC) covered with FeS dotted MoS2 nanosheets, has been established. Synergy between the CFC as a self-standing conductive substrate and the FeS nanoparticle dotted MoS2 nanosheets with abundant active sites makes the noble-metal-free catalytic electrode FeS@MoS2/CFC highly efficient in nitrogen reduction reaction (NRR), with an ammonia production rate of 8.45 mu g h(-1) cm(-2) and excellent long-term stability at -0.5 V in pH neutral electrolyte. Further electrolysis in acidic and alkaline electrolytes revealed the overall NRR catalytic activity of this electrode over a wide pH range.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
FeS nanoparticles, MoS2 nanosheets, Nitrogen reduction reaction, Bioinspired catalysts
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-255360 (URN)10.1016/j.nanoen.2019.05.051 (DOI)000474636100033 ()2-s2.0-85065865579 (Scopus ID)
Note

QC 20190731

Available from: 2019-07-31 Created: 2019-07-31 Last updated: 2019-07-31Bibliographically approved
Zhang, J., Hao, Y., Yang, L., Mohammadi, H., Vlachopoulos, N., Sun, L., . . . Sheibani, E. (2019). Electrochemically polymerized poly (3, 4-phenylenedioxythiophene) as efficient and transparent counter electrode for dye sensitized solar cells. Electrochimica Acta, 300, 482-488
Open this publication in new window or tab >>Electrochemically polymerized poly (3, 4-phenylenedioxythiophene) as efficient and transparent counter electrode for dye sensitized solar cells
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2019 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 300, p. 482-488Article in journal (Refereed) Published
Abstract [en]

A new conducting polymer poly (3, 4-phenylenedioxythiophene) is synthesized by the electrochemical polymerization technique with different solvents. We find that solvents used in electrochemical polymerization play important roles for the catalytic activity and morphology of the formed conducting polymers. The obtained poly (3, 4-phenylenedioxythiophene) is for the first time employed as counter electrode electrocatalyst in dye sensitized solar cells with cobalt-based electrolytes. We demonstrate that a polymer prepared from a mixed acetonitrile-dichloromethane solvent exhibit higher catalytic activity for redox reactions, as compared to that from a single solvent, dichloromethane. The devices based on this mixed solvent-based polymer from a mixed solvents show a high power conversion efficiency of 5.97%. An additional advantageous feature of the electrochemically polymerized poly (3, 4-phenylenedioxythiophene) for solar cell applications is the high transparency in the visible and nearinfrared region. We also investigate the beneficial effect of the poly (3, 4-phenylenedioxythiophene) layer thickness on device performance, and concluded that the series resistance and charge transfer resistance are greatly influenced by the thickness of polymer, as evidenced by electrochemical impedance spectroscopy measurements. The optimal thickness for poly (3, 4-phenylenedioxythiophene) is about 100 nm. Furthermore, the high catalytic activity and transparency of the new conducting polymer as counter electrode shows great promise for other optoelectronic applications.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
poly(PheDOT), Counter electrode, Dye sensitized solar cells, Electrochemical polymerization
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-245127 (URN)10.1016/j.electacta.2019.01.006 (DOI)000458488200057 ()2-s2.0-85061301933 (Scopus ID)
Note

QC 20190315

Available from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-06-11Bibliographically approved
Elawad, M., Sun, L., Mola, G. T., Yu, Z. & Arbab, E. A. (2019). Enhanced performance of perovskite solar cells using p-type doped PFB:F4TCNQ composite as hole transport layer. Journal of Alloys and Compounds, 771, 25-32
Open this publication in new window or tab >>Enhanced performance of perovskite solar cells using p-type doped PFB:F4TCNQ composite as hole transport layer
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2019 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 771, p. 25-32Article in journal (Refereed) Published
Abstract [en]

Conjugated polymers have been widely used as hole transport materials (HTM) in the preparation of mesoscopic perovskite solar cells (PSCs). In this work, we employed p-type doped conducting polymer known as poly(9,9-dioctylfluorene-co-bis-N,N-(-4-butyl phenyl)-bis-N,N-phenyl-1,4-phenylenediamine) (PFB) as a hole transport material (HTM) in perovskite based solar cell. The effect of dopant concentration on the optical and electrical properties of PEB was investigated to optimize the electrical properties of the material for the best function of the solar cell. The highest power conversion efficiency of mesoscopic perovskite solar cells (PSCs), fabricated in this investigation, was found to be 14.04% which is 57% higher than that of pristine PFB hole transport layer. The UV–Vis absorption and Raman spectroscopy measurements confirm the occurrence of oxidation in a p-type doped PFB hole transport layer. This is attributed to the transfer of electrons from the highest occupied molecular orbital (HOMO) of PEB to the lowest unoccupied molecular orbital (LUMO) of F4TCNQ. The solar cells produced using p-type doped PFB:F4TCNQ composite not only improves device performances but also shows superior long-term stability. The optical, morphological and electrical properties of the doped composite PFB: F4TCNQ and newly fabricated devices are presented and discussed in this paper.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Device stability, Hole transport material, P-type PFB, Perovskite, Solar cell, Conducting polymers, Conjugated polymers, Doping (additives), Hole mobility, Molecular orbitals, Perovskite solar cells, Photoconducting materials, Polymer solar cells, Superconducting materials, Highest occupied molecular orbital, Hole transport materials, Lowest unoccupied molecular orbital, N-phenyl-1, 4-phenylenediamine, Optical and electrical properties, P-type, Raman spectroscopy measurements, Solar cells
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-236331 (URN)10.1016/j.jallcom.2018.08.025 (DOI)000449621500004 ()2-s2.0-85052655348 (Scopus ID)
Funder
Swedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20181109

Available from: 2018-11-09 Created: 2018-11-09 Last updated: 2018-11-28Bibliographically approved
Zhao, Y., Shen, J., Yu, Z., Hu, M., Liu, C., Fan, J., . . . Sun, L. (2019). Fine-tuning the coordination atoms of copper redox mediators: an effective strategy for boosting the photovoltage of dye-sensitized solar cells. Journal of Materials Chemistry A, 7(20), 12808-12814
Open this publication in new window or tab >>Fine-tuning the coordination atoms of copper redox mediators: an effective strategy for boosting the photovoltage of dye-sensitized solar cells
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2019 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 7, no 20, p. 12808-12814Article in journal (Refereed) Published
Abstract [en]

Natural systems have marvelously utilized copper complexes featuring sulfur-coordinating ligands, known as blue copper proteins, as efficient electron-transfer mediators in biological processes. Copper complexes with sulfur-coordinating ligands have been attempted as redox mediators in dye-sensitized solar cells (DSCs), the performance of which is not yet satisfactory and still remains less well explored. Herein, we report the application of new copper complexes bearing a tetradentate polythioether ligand, [(S-4)Cu](2+/+) (1(2+/+), S-4 = 1,4,8,11-tetrathiocyclotetradecane), as a redox mediator in DSCs in comparison with its N-4-tetradentate counterpart [(N-4)Cu](2+/+) (2(2+/+), N-4 = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane). Impressively, the changes of coordination atoms from N to S positively shift the formal redox potential of the copper complexes by 600 mV, leading to a remarkably high photovoltage approaching 1.0 V. This is one of the highest photovoltage values reported thus far for DSCs based on copper redox mediators.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-255332 (URN)10.1039/c9ta02735a (DOI)000472219400043 ()2-s2.0-85065996569 (Scopus ID)
Note

QC 20190807

Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved
Lee, H., Wu, X., Ye, Q., Wu, X., Wang, X., Zhao, Y. & Sun, L. (2019). Hierarchical CoS2/Ni3S2/CoNiOx nanorods with favorable stability at 1 A cm(-2) for electrocatalytic water oxidation. Chemical Communications, 55(11), 1564-1567
Open this publication in new window or tab >>Hierarchical CoS2/Ni3S2/CoNiOx nanorods with favorable stability at 1 A cm(-2) for electrocatalytic water oxidation
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2019 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 55, no 11, p. 1564-1567Article in journal (Refereed) Published
Abstract [en]

Herein, we have reported an easily synthesized CoS2/Ni3S2/CoNiOx water oxidation catalyst with excellent catalytic activity and superior durability. The as-prepared catalyst required overpotential (eta) as low as 256 mV to exhibit a current density of 10 mA cm(-2) in 1.0 M KOH. Remarkably, it sustained a current density of 1 A cm(-2) for one week in 30% KOH solution with only 25 mV increment of eta. Thus, it is a hopeful candidate as a highly-effective water oxidation electrode in practical applications.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2019
National Category
Other Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-244518 (URN)10.1039/c8cc09104h (DOI)000457645500003 ()30648178 (PubMedID)2-s2.0-85060927802 (Scopus ID)
Note

QC 20190402

Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02Bibliographically approved
Cai, B., Yang, X., Wang, H., Wang, W., An, J. & Sun, L. (2019). High isotropic dispiro structure hole transporting materials for planar perovskite solar cells. Journal of Energy Challenges and Mechanics, 32, 152-158
Open this publication in new window or tab >>High isotropic dispiro structure hole transporting materials for planar perovskite solar cells
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2019 (English)In: Journal of Energy Challenges and Mechanics, ISSN 2095-4956, E-ISSN 2056-9386, Vol. 32, p. 152-158Article in journal (Refereed) Published
Abstract [en]

Two novel fluorene-based hole transporting materials (HTMs) were synthesized to be used in perovskite solar cells (PSCs). C102 was designed based on C101 by simply linking the two carbon-carbon single bonds to compose a "dispiro" structure. Their typically similar structures cause them sharing almost the same energy levels. However, their photovoltaic performances are quite different due to the small variations. The PSC that contained the "dispiro" structure, C102, reached a power conversion efficiency (PCE) of 17.4%, while the device contained C101, obtained a lower PCE of 15.5%. Electrochemical properties and Photovoltaic characterization of the two materials have been investigated to explain the result. It is shown that C102 has a stronger ability to transport holes and resist the charge recombination. Thus, the dispiro structure should be more appropriate being used as HTM in PSCs. Physics, Chinese Academy of Sciences.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Dispiro, Hole transporting materials, Planar perovskite solar cells
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-255339 (URN)10.1016/j.jechem.2018.07.013 (DOI)000473219200016 ()2-s2.0-85052139154 (Scopus ID)
Note

QC 20190807

Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved
Wu, X., Wu, X., Lee, H., Ye, Q., Wang, X., Zhao, Y. & Sun, L. (2019). Hollow Carbon@NiCo2O4 Core-Shell Microspheres for Efficient Electrocatalytic Oxygen Evolution. ENERGY TECHNOLOGY, 7(4), Article ID 1800919.
Open this publication in new window or tab >>Hollow Carbon@NiCo2O4 Core-Shell Microspheres for Efficient Electrocatalytic Oxygen Evolution
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2019 (English)In: ENERGY TECHNOLOGY, ISSN 2194-4288, Vol. 7, no 4, article id 1800919Article in journal (Refereed) Published
Abstract [en]

Earth-abundant transition metal oxides are considered one of the most promising oxygen evolution reaction (OER) catalysts. However, their intrinsically low electrical conductivity inhibits the fast kinetics for OER. To overcome this drawback, hollow carbon@NiCo2O4 core-shell microspheres (C@NiCo2O4 HSs) are synthesized with enhanced electrocatalytic activity and stability toward OER. The prepared C@NiCo2O4/Ni foam delivers a current density of 10 mA cm(-2) at a small overpotential of 268 mV and exhibits a low Tafel slope of 54 mV dec(-1). The enhanced OER performance is attributed to the enlarged specific surface area induced by the combination effect between the 1D nanosheet structure and the 3D hollow microsphere structure, and the improved electrical conductivity is ascribed to the carbon core support.

National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:kth:diva-252992 (URN)10.1002/ente.201800919 (DOI)000466486200004 ()
Note

QC 20190729

Available from: 2019-07-29 Created: 2019-07-29 Last updated: 2019-07-29Bibliographically approved
Wang, L., Sheibani, E., Guo, Y., Zhang, W., Li, Y., Liu, P., . . . Sun, L. (2019). Impact of Linking Topology on the Properties of Carbazole-Based Hole-Transport Materials and their Application in Solid-State Mesoscopic Solar Cells. SOLAR RRL, Article ID 1900196.
Open this publication in new window or tab >>Impact of Linking Topology on the Properties of Carbazole-Based Hole-Transport Materials and their Application in Solid-State Mesoscopic Solar Cells
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2019 (English)In: SOLAR RRL, ISSN 2367-198X, article id 1900196Article in journal (Refereed) Epub ahead of print
Abstract [en]

Carbazole is a promising core for the molecular design of hole-transport materials (HTMs) for solid-state mesoscopic solar cells (ssMSCs), such as solid-state dye-sensitized solar cells (ssDSSCs) and perovskite solar cells (PSCs) due to its low cost and excellent optoelectronic properties of its derivatives. Although carbazole-based HTMs are intensely investigated in ssMSCs and promising device performance is demonstrated, the fundamental understanding of the impact of linking topology on the properties of carbazole-based HTMs is lacking. Herein, the effect of the linking topology on the optical and electronic properties of a series of carbazole-based HTMs with 2,7-substitution and 3,6-substitution is systematically investigated. The results demonstrate that the 2,7-substituted carbazole-based HTMs display higher hole mobility and conductivity among this series of analogous molecules, thereby exhibiting better device performance. In addition, the conductivity of the HTMs is improved after light treatment, which explains the commonly observed light-soaking phenomenon of ssMSCs in general. All these carbazole-based HTMs are successfully applied in ssMSCs and one of the HTMs X50-based devices yield a promising efficiency of 6.8% and 19.2% in ssDSSCs and PSCs, respectively. This study provides guidance for the molecular design of effective carbazole-based HTMs for high-performance ssMSCs and related electronic devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2019
Keywords
hole-transport materials, carbazole, linking topology, mesoscopic solar cells, perovskite solar cells
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-255742 (URN)10.1002/solr.201900196 (DOI)000477425300001 ()
Note

QC 20190813

Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-4521-2870

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