Cargando…
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...
Autores principales: | , , , |
---|---|
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 |
_version_ | 1784633819962277888 |
---|---|
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. |
format | Online Article Text |
id | pubmed-8762702 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT jeonghyewon sacrificialagentgonerogueelectronacceptorinduceddegradationofcspbbr3photocathodes AT zsigmondtamassandor sacrificialagentgonerogueelectronacceptorinduceddegradationofcspbbr3photocathodes AT samugergelyferenc sacrificialagentgonerogueelectronacceptorinduceddegradationofcspbbr3photocathodes AT janakycsaba sacrificialagentgonerogueelectronacceptorinduceddegradationofcspbbr3photocathodes |