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Publications (10 of 492) Show all publications
Wan, X., Yu, Z., Tian, W., Huang, F., Jin, S., Yang, X., . . . Sun, L. (2020). Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology. Journal of Energy Challenges and Mechanics, 46, 8-15
Open this publication in new window or tab >>Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology
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2020 (English)In: Journal of Energy Challenges and Mechanics, ISSN 2095-4956, E-ISSN 2056-9386, Vol. 46, p. 8-15Article in journal (Refereed) Published
Abstract [en]

All-inorganic cesium lead bromide (CsPbBr3) perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb stability. However, the fabrication of high-quality CsPbBr3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common solvents. Herein, we report a facile solution-processed approach to prepare high-quality CsPbBr3 perovskite films via a two-step spin-coating method, in which the CsBr methanol/H2O mixed solvent solution is spin-coated onto the lead bromide films, followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film morphology. In this fashion, dense and uniform CsPbBr3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect density. The effectiveness of the resulting CsPbBr3 films is further examined in perovskite solar cells (PSCs) with a simplified planar architecture of fluorine‒doped tin oxide/compact TiO2/CsPbBr3/carbon, which deliver a maximum power conversion efficiency of 8.11% together with excellent thermal and humidity stability. The present work offers a simple and effective strategy in fabrication of high-quality CsPbBr3 films for efficient and stable PSCs as well as other optoelectronic devices.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
All-inorganic perovskite solar cells, CsPbBr3, Morphology control, Solution-processed, Stability
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-267778 (URN)10.1016/j.jechem.2019.10.017 (DOI)2-s2.0-85074876341 (Scopus ID)
Note

QC 20200304

Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved
Li, F., Zhao, Z., Yang, H., Zhou, D., Zhao, Y., Li, Y., . . . Sun, L. (2020). Electrochemical and photoelectrochemical water splitting with a CoO: X catalyst prepared by flame assisted deposition. Dalton Transactions, 49(3), 588-592
Open this publication in new window or tab >>Electrochemical and photoelectrochemical water splitting with a CoO: X catalyst prepared by flame assisted deposition
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2020 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 49, no 3, p. 588-592Article in journal (Refereed) Published
Abstract [en]

A novel flame-assisted deposition (FAD) method was used to generate and immobilize cobalt oxide (CoOx) on the surface of fluorine-doped tin oxide (FTO) and TiO2 modified hematite (TiO2/Fe2O3) for electrochemical and photoelectrochemical (PEC) water oxidation, respectively, with significant performance.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2020
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-267841 (URN)10.1039/c9dt03983j (DOI)000509360800003 ()31825037 (PubMedID)2-s2.0-85078328903 (Scopus ID)
Note

QC 20200306

Available from: 2020-03-06 Created: 2020-03-06 Last updated: 2020-03-06Bibliographically approved
Sheng, X., Li, Y., Yang, T., Timmer, B., Willhammar, T., Cheung, O., . . . Sun, L. (2020). Hierarchical micro-reactor as electrodes for water splitting by metal rod tipped carbon nanocapsule self-assembly in carbonized wood. Applied Catalysis B: Environmental, 264, Article ID 118536.
Open this publication in new window or tab >>Hierarchical micro-reactor as electrodes for water splitting by metal rod tipped carbon nanocapsule self-assembly in carbonized wood
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2020 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 264, article id 118536Article in journal (Refereed) Published
Abstract [en]

Materials design of efficient electrochemical micro-reactors is challenging, although hierarchically structured, self-standing electrodes with catalyst arrays offer promise. Herein, catalyst function in compact micro-reactor electrodes is designed by nanostructural tailoring of carbonized wood for efficient water splitting. Specifically, NiFe rod tipped, N-doped graphitic carbon nanocapsule arrays are self-assembled in hierarchical wood, and the benefit of this unique presentation and its promotive effect on accessibility of the catalyst surfaces is apparent. This report also comprises the first wood based micro-reactor electrodes for electrocatalytic water oxidation demonstrating excellent performance. The overpotential for oxygen evolution reaction was as low as 180 mV for 10 mA cm−2 current density and TOFredox was high at a level of 5.8 s−1 (at 370 mV overpotential). This hierarchical electrode can also work as bifunctional catalyst (both as anodic and as cathodic electrode) for total water splitting with a cell potential of 1.49 V for 10 mA cm−2 in alkaline solution, suggestive of their potential also in other electrochemical applications.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Carbonized wood, Metal rod tipped carbon nanocapsules, Microfluidic electrodes, Oxygen evolution reaction
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-267782 (URN)10.1016/j.apcatb.2019.118536 (DOI)2-s2.0-85076717565 (Scopus ID)
Note

QC 20200304

Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved
Zhang, W., Wang, L., Guo, Y., Zhang, B., Leandri, V., Xu, B., . . . Kloo, L. (2020). Single crystal structure and opto-electronic properties of oxidized Spiro-OMeTAD. Chemical Communications, 56(10), 1589-1592
Open this publication in new window or tab >>Single crystal structure and opto-electronic properties of oxidized Spiro-OMeTAD
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2020 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 56, no 10, p. 1589-1592Article in journal (Refereed) Published
Abstract [en]

Single crystals of Spiro(TFSI)2 were grown, the optical and electronic properties were characterized and compared with neutral Spiro-OMeTAD. Density-functional theory was used to get insights into binding and band structure properties. The flat valence bands indicate a rather limited orbital overlap in Spiro(TFSI)2.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2020
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-267203 (URN)10.1039/C9CC09270F (DOI)000511328200025 ()31934696 (PubMedID)2-s2.0-85079022862 (Scopus ID)
Note

QC 20200204

Available from: 2020-02-04 Created: 2020-02-04 Last updated: 2020-02-25Bibliographically approved
Yu, Z., Hagfeldt, A. & Sun, L. (2020). The application of transition metal complexes in hole-transporting layers for perovskite solar cells: Recent progress and future perspectives. Coordination chemistry reviews, 406, Article ID 213143.
Open this publication in new window or tab >>The application of transition metal complexes in hole-transporting layers for perovskite solar cells: Recent progress and future perspectives
2020 (English)In: Coordination chemistry reviews, ISSN 0010-8545, E-ISSN 1873-3840, Vol. 406, article id 213143Article, review/survey (Refereed) Published
Abstract [en]

In the past few years, the photovoltaic community has witnessed a fast growth of inorganic-organic hybrid perovskite solar cells (PSCs) due to their exceptional power conversion efficiencies with a certified record value exceeding 25%, which rivals the established commercial solar cell technologies. In the stateof-the-art PSCs, a hole-transporting layer (HTL) typically consisting of an active hole-transporting material (HTM) and some additives or dopants, takes the responsibility of transporting the photo-generated holes from the perovskite to the selective contact electrode, and is a key component for achieving high-performance and stable PSCs. In this review article, recent advances in the development of transition metal complexes in HTLs for PSCs including HTMs and p-type dopants are presented.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Transition metal complex, Perovskite solar cells, Hole-transporting materials, P-type dopant, Phthalocyanine, Porphyrin
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-268806 (URN)10.1016/j.ccr.2019.213143 (DOI)000510959500002 ()2-s2.0-85076476281 (Scopus ID)
Note

QC 20200225

Available from: 2020-02-25 Created: 2020-02-25 Last updated: 2020-02-25Bibliographically approved
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
Li, W., Li, F., Yang, H., Wu, X., Zhang, P., Shan, Y. & Sun, L. (2019). A bio-inspired coordination polymer as outstanding water oxidation catalyst via second coordination sphere engineering. Nature Communications, 10, Article ID 5074.
Open this publication in new window or tab >>A bio-inspired coordination polymer as outstanding water oxidation catalyst via second coordination sphere engineering
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 5074Article in journal (Refereed) Published
Abstract [en]

First-row transition metal-based catalysts have been developed for the oxygen evolution reaction (OER) during the past years, however, such catalysts typically operate at overpotentials (eta) significantly above thermodynamic requirements. Here, we report an iron/ nickel terephthalate coordination polymer on nickel form (NiFeCP/NF) as catalyst for OER, in which both coordinated and uncoordinated carboxylates were maintained after electrolysis. NiFeCP/NF exhibits outstanding electro-catalytic OER activity with a low overpotential of 188 mV at 10 mA cm(-2) in 1.0 KOH, with a small Tafel slope and excellent stability. The pH-independent OER activity of NiFeCP/NF on the reversible hydrogen electrode scale suggests that a concerted proton-coupled electron transfer (c-PET) process is the rate-determining step (RDS) during water oxidation. Deuterium kinetic isotope effects, proton inventory studies and atom-proton-transfer measurements indicate that the uncoordinated carboxylates are serving as the proton transfer relays, with a similar function as amino acid residues in photosystem II (PSII), accelerating the proton-transfer rate.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-264324 (URN)10.1038/s41467-019-13052-1 (DOI)000494938800001 ()31699987 (PubMedID)2-s2.0-85074684201 (Scopus ID)
Note

QC 20191202

Available from: 2019-12-02 Created: 2019-12-02 Last updated: 2019-12-19Bibliographically approved
Zhang, B. & Sun, L. (2019). Across the Board: Licheng Sun on the Mechanism of O-O Bond Formation in Photosystem II. ChemSusChem, 12(14), 3401-3404
Open this publication in new window or tab >>Across the Board: Licheng Sun on the Mechanism of O-O Bond Formation in Photosystem II
2019 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 12, no 14, p. 3401-3404Article in journal (Refereed) Published
Abstract [en]

In this series of articles, the board members of ChemSusChem discuss recent research articles that they consider of exceptional quality and importance for sustainability. This entry features Prof. L. Sun, who proposes a special mechanism for O-O bond formation in photosystem II with involvement of an Mn-VII-oxo species induced by charge- and structural rearrangements. In this viewpoint, Proton transfer is involved in changes of the first coordination spheres around the Mn-VII-oxo site on the dangling Mn4 with de- and re-coordination of carboxylates (Glu333 and Asp170).

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2019
Keywords
disproportionation, oxygen evolution, photosystem II, structural rearrangement, water splitting
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:kth:diva-257575 (URN)10.1002/cssc.201901438 (DOI)000478633900023 ()31240851 (PubMedID)2-s2.0-85068351514 (Scopus ID)
Note

QC 20190923

Available from: 2019-09-23 Created: 2019-09-23 Last updated: 2019-09-23Bibliographically 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
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4521-2870

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