Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 412) Show all publications
Qu, J., Jiang, X., Yu, Z., Lai, J., Zhao, Y., Hu, M., . . . Sun, L. (2018). Improved performance and air stability of perovskite solar cells based on low-cost organic hole-transporting material X60 by incorporating its dicationic salt. Science in China Series B: Chemistry, 61(2), 172-179.
Open this publication in new window or tab >>Improved performance and air stability of perovskite solar cells based on low-cost organic hole-transporting material X60 by incorporating its dicationic salt
Show others...
2018 (English)In: Science in China Series B: Chemistry, ISSN 1674-7291, E-ISSN 1869-1870, Vol. 61, no 2, p. 172-179Article in journal (Refereed) Published
Abstract [en]

The development of an efficient, stable, and low-cost hole-transporting material (HTM) is of great significance for perovskite solar cells (PSCs) from future commercialization point of view. Herein, we specifically synthesize a dicationic salt of X60 termed X60(TFSI)(2), and adopt it as an effective and stable "doping" agent to replace the previously used lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) for the low-cost organic HTM X60 in PSCs. The incorporation of this dicationic salt significantly increases the hole conductivity of X60 by two orders of magnitude from 10(-6) to 10(-4) S cm(-1). The dramatic enhancement of the conductivity leads to an impressive power conversion efficiency (PCE) of 19.0% measured at 1 sun illumination (100 mW cm(-2), AM 1.5 G), which is comparable to that of the device doped with LiTFSI (19.3%) under an identical condition. More strikingly, by replacing LiTFSI, the PSC devices incorporating X60(TFSI)(2) also show an excellent long-term durability under ambient atmosphere for 30 days, mainly due to the hydrophobic nature of the X60(TFSI)(2) doped HTM layer, which can effectively prevent the moisture destroying the perovskite layer. The present work paves the way for the development of highly efficient, stable, and low-cost HTM for potential commercialization of PSCs.

Place, publisher, year, edition, pages
Science Press, 2018
Keyword
perovskite solar cells, hole-transporting materials, X60, stability, sustainable energy
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-223271 (URN)10.1007/s11426-017-9141-9 (DOI)000424012300006 ()
Funder
Swedish Foundation for Strategic Research Swedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20180216

Available from: 2018-02-16 Created: 2018-02-16 Last updated: 2018-02-16Bibliographically approved
Gao, Y., Ye, L., Cao, S., Chen, H., Yao, Y., Jiang, J. & Sun, L. (2018). Perovskite Hydroxide CoSn(OH)(6) Nanocubes for Efficient Photoreduction of CO2 to CO. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 6(1), 781-786.
Open this publication in new window or tab >>Perovskite Hydroxide CoSn(OH)(6) Nanocubes for Efficient Photoreduction of CO2 to CO
Show others...
2018 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 6, no 1, p. 781-786Article in journal (Refereed) Published
Abstract [en]

Perovskite hydroxide CoSn(OH)(6) nanoparticles were synthesized and used for the first time in the photocatalytic reduction of CO2 to CO. Under mild reaction conditions and using [Ru(bpy)(3)](PF6)(2) as the photosensitizer, a high photocatalytic efficiency of 19.3 mu mol for CO evolution with a high selectivity of 86.46% was obtained. The photocatalytic TEOA activity and CO selectivity were further improved by adding weak Bronsted acids, as proton sources, to the system.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
Keyword
Photocayalysis, CO2 reduction, CoSn(OH)(6) nanocubes
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-221959 (URN)10.1021/acssuschemeng.7b03119 (DOI)000419536800083 ()2-s2.0-85040078090 (Scopus ID)
Note

QC 20180130

Available from: 2018-01-30 Created: 2018-01-30 Last updated: 2018-01-30Bibliographically approved
Hou, J., Sun, Y., Wu, Y., Cao, S. & Sun, L. (2018). Promoting Active Sites in Core-Shell Nanowire Array as Mott-Schottky Electrocatalysts for Efficient and Stable Overall Water Splitting. Advanced Functional Materials, 28(4), Article ID 1704447.
Open this publication in new window or tab >>Promoting Active Sites in Core-Shell Nanowire Array as Mott-Schottky Electrocatalysts for Efficient and Stable Overall Water Splitting
Show others...
2018 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 28, no 4, article id 1704447Article in journal (Refereed) Published
Abstract [en]

Developing earth-abundant, active, and robust electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains a vital challenge for efficient conversion of sustainable energy sources. Herein, metal-semiconductor hybrids are reported with metallic nanoalloys on various defective oxide nanowire arrays (Cu/CuOx, Co/CoOx, and CuCo/CuCoOx) as typical Mott-Schottky electrocatalysts. To build the highway of continuous electron transport between metals and semiconductors, nitrogen-doped carbon (NC) has been implanted on metal-semiconductor nanowire array as core-shell conductive architecture. As expected, NC/CuCo/CuCoOx nanowires arrays, as integrated Mott-Schottky electrocatalysts, present an overpotential of 112 mV at 10 mA cm(-2) and a low Tafel slope of 55 mV dec(-1) for HER, simultaneously delivering an overpotential of 190 mV at 10 mA cm(-2) for OER. Most importantly, NC/CuCo/CuCoOx architectures, as both the anode and the cathode for overall water splitting, exhibit a current density of 10 mA cm(-2) at a cell voltage of 1.53 V with excellent stability due to high conductivity, large active surface area, abundant active sites, and the continuous electron transport from prominent synergetic effect among metal, semiconductor, and nitrogen-doped carbon. This work represents an avenue to design and develop efficient and stable Mott-Schottky bifunctional electrocatalysts for promising energy conversion.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2018
Keyword
core-shell nanowire arrays, metal-semiconductors, Mott-Schottky electrocatalysts, nitrogen-doped carbon, overall water splitting
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-222177 (URN)10.1002/adfm.201704447 (DOI)000422930400005 ()
Note

QC 20180207

Available from: 2018-02-07 Created: 2018-02-07 Last updated: 2018-02-07Bibliographically approved
Zhang, J., Xu, B., Yang, L., Ruan, C., Wang, L., Liu, P., . . . Johansson, E. M. J. (2018). The Importance of Pendant Groups on Triphenylamine-Based Hole Transport Materials for Obtaining Perovskite Solar Cells with over 20% Efficiency. ADVANCED ENERGY MATERIALS, 8(2), Article ID 1701209.
Open this publication in new window or tab >>The Importance of Pendant Groups on Triphenylamine-Based Hole Transport Materials for Obtaining Perovskite Solar Cells with over 20% Efficiency
Show others...
2018 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 8, no 2, article id 1701209Article in journal (Refereed) Published
Abstract [en]

Tremendous progress has recently been achieved in the field of perovskite solar cells (PSCs) as evidenced by impressive power conversion efficiencies (PCEs); but the high PCEs of >20% in PSCs has so far been mostly achieved by using the hole transport material (HTM) spiro-OMeTAD; however, the relatively low conductivity and high cost of spiro-OMeTAD significantly limit its potential use in large-scale applications. In this work, two new organic molecules with spiro[fluorene-9,9-xanthene] (SFX)-based pendant groups, X26 and X36, have been developed as HTMs. Both X26 and X36 present facile syntheses with high yields. It is found that the introduced SFX pendant groups in triphenylamine-based molecules show significant influence on the conductivity, energy levels, and thin-film surface morphology. The use of X26 as HTM in PSCs yields a remarkable PCE of 20.2%. In addition, the X26-based devices show impressive stability maintaining a high PCE of 18.8% after 5 months of aging in controlled (20%) humidity in the dark. We believe that X26 with high device PCEs of >20% and simple synthesis show a great promise for future application in PSCs, and that it represents a useful design platform for designing new charge transport materials for optoelectronic applications.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2018
Keyword
high efficiency, hole transport materials, perovskites, photovoltaic devices, solar cells
National Category
Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-221930 (URN)10.1002/aenm.201701209 (DOI)000419864800001 ()2-s2.0-85040726245 (Scopus ID)
Note

QC 20180131

Available from: 2018-01-31 Created: 2018-01-31 Last updated: 2018-01-31Bibliographically approved
Li, X., Gong, C., Gurzadyan, G. G., Gelin, M. F., Liu, J. & Sun, L. (2018). Ultrafast Relaxation Dynamics in Zinc Tetraphenylporphyrin Surface-Mounted Metal Organic Framework. The Journal of Physical Chemistry C, 122(1), 50-61.
Open this publication in new window or tab >>Ultrafast Relaxation Dynamics in Zinc Tetraphenylporphyrin Surface-Mounted Metal Organic Framework
Show others...
2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 1, p. 50-61Article in journal (Refereed) Published
Abstract [en]

Ordered porphyrin-based metal organic frameworks (MOFs) may serve as a model for mimicking the natural photosynthesis with highly ordered chlorophylls, i.e., porphyrin-like chromophores. Study of light harvesting and energy transfer as the primary event of photosynthesis is of great importance leading to improvement of photovoltaics overall performance. Detailed characterization of ultrafast dynamics of zinc tetraphenylporphyrin (ZnTPP) surface mounted metal organic framework (SURMOF) is reported by using various steady-state and time-resolved laser spectroscopic techniques, i.e., time correlated single photon counting, fluorescence up-conversion and transient absorption pump-probe with 20 fs resolution. Obtained results in these nanoporous materials were compared with corresponding results for ZnTPP in ethanol measured under the same conditions. Dramatic quenching of both upper excited singlet state S-2 and first excited state SI was observed. Subpicosecond and picosecond lifetimes were detected in transient fluorescence and absorption. Analytical formulas are derived for the linear absorption, steady-state fluorescence, and fluorescence up-conversion signals. Theoretical description excellently reproduces experimental time and frequency resolved signals. Strong quenching of the femtosecond transients in SURMOF is explained in terms of highly efficient Forster resonance energy transfer between the neighboring porphyrin moieties which is caused by a strong spectral overlap of absorption and steady-state fluorescence spectra and quantum coherent energy transfer and redistribution.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-222190 (URN)10.1021/acs.jpcc.7b08696 (DOI)000422814200006 ()2-s2.0-85039063416 (Scopus ID)
Note

QC 20180205

Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2018-02-05Bibliographically approved
Jiang, X., Yu, Z., Li, H.-B., Zhao, Y., Qu, J., Lai, J., . . . Sun, L. (2017). A solution-processable copper(II) phthalocyanine derivative as a dopant-free hole-transporting material for efficient and stable carbon counter electrode-based perovskite solar cells. Journal of Materials Chemistry A, 5(34), 17862-17866.
Open this publication in new window or tab >>A solution-processable copper(II) phthalocyanine derivative as a dopant-free hole-transporting material for efficient and stable carbon counter electrode-based perovskite solar cells
Show others...
2017 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 5, no 34, p. 17862-17866Article in journal (Refereed) Published
Abstract [en]

A solution-processable copper(II) phthalocyanine derivative coded as CuPc-TIPS has been synthesized and adopted as a hole-transporting material (HTM) in perovskite solar cells (PSCs), in combination with a mixed-ion perovskite absorber and a low-cost carbon cathode. Optimised PSC devices based on pristine CuPc-TIPS without any additives or dopants show a decent power conversion efficiency of 14.0% (measured at 100 mW cm(-2) illumination, AM 1.5G), together with a good long-termstability under ambient conditions. The present finding highlights the potential of solution-processed copper phthalocyanine derivative-based HTMs for the development of efficient and stable PSCs in the future.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-214481 (URN)10.1039/c7ta04569g (DOI)000408592900014 ()2-s2.0-85028728701 (Scopus ID)
Note

QC 20171009

Available from: 2017-10-09 Created: 2017-10-09 Last updated: 2017-10-09Bibliographically approved
Hou, J., Wu, Y., Cao, S., Sun, Y. & Sun, L. (2017). Active Sites Intercalated Ultrathin Carbon Sheath on Nanowire Arrays as Integrated Core-Shell Architecture: Highly Efficient and Durable Electrocatalysts for Overall Water Splitting. Small, 13(46), Article ID UNSP 1702018.
Open this publication in new window or tab >>Active Sites Intercalated Ultrathin Carbon Sheath on Nanowire Arrays as Integrated Core-Shell Architecture: Highly Efficient and Durable Electrocatalysts for Overall Water Splitting
Show others...
2017 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 13, no 46, article id UNSP 1702018Article in journal (Refereed) Published
Abstract [en]

The development of active bifunctional electrocatalysts with low cost and earth-abundance toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains a great challenge for overall water splitting. Herein, metallic Ni4Mo nanoalloys are firstly implanted on the surface of NiMoOx nanowires array (NiMo/NiMoOx) as metal/metal oxides hybrid. Inspired by the superiority of carbon conductivity, an ultrathin nitrogen-doped carbon sheath intercalated NiMo/NiMoOx (NC/NiMo/NiMoOx) nanowires as integrated core-shell architecture are constructed. The integrated NC/NiMo/NiMoOx array exhibits an overpotential of 29 mV at 10 mA cm(-2) and a low Tafel slope of 46 mV dec(-1) for HER due to the abundant active sites, fast electron transport, low charge-transfer resistance, unique architectural structure and synergistic effect of carbon sheath, nanoalloys, and oxides. Moreover, as OER catalysts, the NC/NiMo/NiMoOx hybrids require an overpotential of 284 mV at 10 mA cm(-2). More importantly, the NC/NiMo/NiMoOx array as a highly active and stable electrocatalyst approaches approximate to 10 mA cm(-2) at a voltage of 1.57 V, opening an avenue to the rational design and fabrication of the promising electrode materials with architecture structures toward the electrochemical energy storage and conversion.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017
Keyword
core-shell architecture, electrocatalysts, fast electron transfer, overall water splitting, ultrathin carbon sheath
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-220455 (URN)10.1002/smll.201702018 (DOI)000417498700002 ()
Funder
Swedish Energy AgencyKnut and Alice Wallenberg Foundation
Note

QC 20180104

Available from: 2018-01-04 Created: 2018-01-04 Last updated: 2018-01-04Bibliographically approved
D'Amario, L., Jiang, R., Cappel, U. B., Gibson, E. A., Boschloo, G., Rensmo, H., . . . Tian, H. (2017). Chemical and Physical Reduction of High Valence Ni States in Mesoporous NiO Film for Solar Cell Application. ACS Applied Materials and Interfaces, 9(39), 33470-33477.
Open this publication in new window or tab >>Chemical and Physical Reduction of High Valence Ni States in Mesoporous NiO Film for Solar Cell Application
Show others...
2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 39, p. 33470-33477Article in journal (Refereed) Published
Abstract [en]

The most common material for dye-sensitized photocathodes is mesoporous NiO. We transformed the usual brownish NiO to be more transparent by reducing high valence Ni impurities. Two pretreatment methods have been used: chemical reduction by NaBH4 and thermal reduction by heating. The power conversion efficiency of the cell was increased by 33% through chemical treatment, and an increase in open-circuit voltage from 105 to 225 mV was obtained upon heat treatment. By optical spectroelectrochemistry, we could identify two species with characteristically different spectra assigned to Ni3+ and Ni4+. We suggest that the reduction of surface Ni3+ and Ni (4+) to Ni (2+) decreases the recombination reaction between holes on the NiO surface with the electrolyte. It also keeps the dye firmly on the surface, building a barrier for electrolyte recombination. This causes an increase in open-circuit photovoltage for the treated film.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2017
Keyword
p-type, dye-sensitized solar cell, characterization, hole UV-vis spectrum, photovoltage, recombination
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-217040 (URN)10.1021/acsami.7b01532 (DOI)000412717600014 ()28368109 (PubMedID)
Note

QC 20171124

Available from: 2017-11-24 Created: 2017-11-24 Last updated: 2017-11-24Bibliographically approved
Beller, M., Centi, G. & Sun, L. (2017). Chemistry Future: Priorities and Opportunities from the Sustainability Perspective. ChemSusChem, 10(1), 6-13.
Open this publication in new window or tab >>Chemistry Future: Priorities and Opportunities from the Sustainability Perspective
2017 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, no 1, p. 6-13Article in journal (Refereed) Published
Abstract [en]

To celebrate the 10 year anniversary of ChemSusChem, we as the chairmen of the editorial board are writing this Essay to summarize important scientific contributions to our journal during the past decade in terms of sustainable science and technology. Bibliometric analysis of published papers show that biorefinery, solar energy conversion, energy-storage materials, and carbon dioxide utilizations attracted most attention in this area. According to our own knowledge and understanding and from the sustainability point of view, we are also pointing out those research directions that we believe can play key roles in the future chemistry to meet the grand challenges in energy and environment. Hopefully, these perspective aspects will provide the readers with new angles to look at the chemistry in the coming decades and inspire the development of new technologies to make our society sustainable.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017
Keyword
catalysis, chemistry future, energy, solar-driven chemistry, sustainable chemistry, Carbon, Carbon dioxide, Energy conversion, Solar energy, Bibliometric analysis, Carbon dioxide utilization, Editorial board, Energy and environment, Science and Technology, Scientific contributions, Sustainable development
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-202227 (URN)10.1002/cssc.201601739 (DOI)000394571800002 ()2-s2.0-85007236730 (Scopus ID)
Note

Correspondence Address: Beller, M.; Leibniz-Institut für Katalyse e. V., Albert-Einstein-Straße 29a, Germany; email: matthias.beller@catalysis.de. QC 20170320

Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2017-11-29Bibliographically approved
Chen, H., Gao, Y., Lu, Z., Ye, L. & Sun, L. (2017). Copper Oxide Film In-situ Electrodeposited from Cu(II) Complex as Highly Efficient Catalyst for Water Oxidation. Electrochimica Acta, 230, 501-507.
Open this publication in new window or tab >>Copper Oxide Film In-situ Electrodeposited from Cu(II) Complex as Highly Efficient Catalyst for Water Oxidation
Show others...
2017 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 230, p. 501-507Article in journal (Refereed) Published
Abstract [en]

Water splitting is deemed as an effective pathway for producing ideal clean energy, such as hydrogen. Here, a copper oxide film (Cu-Tris film) was prepared in-situ from a 0.2 M phosphate buffer solution (pH = 12.0) containing 1.0 mM Cu2+ and 2.0 mM Tris via controlled-potential electrodeposition. The Cu-Tris film showed a significantly low overpotential of 390 mV at a current density of 1.0 mA/cm2 for electrocatalytic water oxidation. Simultaneously, a considerably low Tafel slope of 41 mV/decade was achieved. This Cu-Tris film also exhibited a high and stable current density of ca. 7.5 mA/cm2 at 1.15 V vs. NHE for long-term electrocatalysis (10 h). These results demonstrated the superior performance of the developed Cu-Tris film, which should be attributed to the regulating effect of the five coordinated planar structure of the Cu-Tris complex precursor during the process of electrodeposition.

Place, publisher, year, edition, pages
Elsevier, 2017
Keyword
Copper based film, Electrocatalyst, Electrodeposition, Water oxidation, Coordination reactions, Copper compounds, Copper oxides, Electrocatalysis, Electrocatalysts, Electrodes, Oxidation, Oxide films, Copper-based, Efficient catalysts, Electrocatalytic, Five-coordinated, Phosphate buffer solutions, Planar structure, Water splitting, Copper
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-208021 (URN)10.1016/j.electacta.2017.01.187 (DOI)000395599900057 ()2-s2.0-85012297950 (Scopus ID)
Note

QC 20170607

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-11-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4521-2870

Search in DiVA

Show all publications