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Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes

[Image: see text] Lead halide perovskites (LHPs) have emerged as perspective materials for light harvesting, due to their tunable band gap and optoelectronic properties. Photocatalytic and photoelectrochemical (PEC) studies, employing LHP/liquid junctions, are evolving, where sacrificial reagents ar...

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Autores principales: Jeong, Hye Won, Zsigmond, Tamás Sándor, Samu, Gergely Ferenc, Janáky, Csaba
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8762702/
https://www.ncbi.nlm.nih.gov/pubmed/35059504
http://dx.doi.org/10.1021/acsenergylett.1c02130
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author Jeong, Hye Won
Zsigmond, Tamás Sándor
Samu, Gergely Ferenc
Janáky, Csaba
author_facet Jeong, Hye Won
Zsigmond, Tamás Sándor
Samu, Gergely Ferenc
Janáky, Csaba
author_sort Jeong, Hye Won
collection PubMed
description [Image: see text] Lead halide perovskites (LHPs) have emerged as perspective materials for light harvesting, due to their tunable band gap and optoelectronic properties. Photocatalytic and photoelectrochemical (PEC) studies, employing LHP/liquid junctions, are evolving, where sacrificial reagents are often used. In this study, we found that a frequently applied electron scavenger (TCNQ) has dual roles: while it leads to rapid electron transfer from the electrode to TCNQ, enhancing the PEC performance, it also accelerates the decomposition of the CsPbBr(3) photoelectrode. The instability of the films is caused by the TCNQ-mediated halide exchange between the dichloromethane solvent and the LHP film, during PEC operation. Charge transfer and halide exchange pathways were proposed on the basis of in situ spectroelectrochemical and ex situ surface characterization methods, also providing guidance on planning PEC experiments with such systems.
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spelling pubmed-87627022022-01-18 Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes Jeong, Hye Won Zsigmond, Tamás Sándor Samu, Gergely Ferenc Janáky, Csaba ACS Energy Lett [Image: see text] Lead halide perovskites (LHPs) have emerged as perspective materials for light harvesting, due to their tunable band gap and optoelectronic properties. Photocatalytic and photoelectrochemical (PEC) studies, employing LHP/liquid junctions, are evolving, where sacrificial reagents are often used. In this study, we found that a frequently applied electron scavenger (TCNQ) has dual roles: while it leads to rapid electron transfer from the electrode to TCNQ, enhancing the PEC performance, it also accelerates the decomposition of the CsPbBr(3) photoelectrode. The instability of the films is caused by the TCNQ-mediated halide exchange between the dichloromethane solvent and the LHP film, during PEC operation. Charge transfer and halide exchange pathways were proposed on the basis of in situ spectroelectrochemical and ex situ surface characterization methods, also providing guidance on planning PEC experiments with such systems. American Chemical Society 2021-12-27 2022-01-14 /pmc/articles/PMC8762702/ /pubmed/35059504 http://dx.doi.org/10.1021/acsenergylett.1c02130 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Jeong, Hye Won
Zsigmond, Tamás Sándor
Samu, Gergely Ferenc
Janáky, Csaba
Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes
title Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes
title_full Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes
title_fullStr Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes
title_full_unstemmed Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes
title_short Sacrificial Agent Gone Rogue: Electron-Acceptor-Induced Degradation of CsPbBr(3) Photocathodes
title_sort sacrificial agent gone rogue: electron-acceptor-induced degradation of cspbbr(3) photocathodes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8762702/
https://www.ncbi.nlm.nih.gov/pubmed/35059504
http://dx.doi.org/10.1021/acsenergylett.1c02130
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