Cargando…
Multicomposite Nanostructured Hematite–Titania Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen Evolution Catalyst
[Image: see text] We present a sol–gel processed hematite–titania-based photoanode, which exhibits a photocurrent of up to 2.5 mA/cm(2) at 1.23 V(RHE) under simulated AM 1.5 G illumination (100 mW/cm(2)) thanks to the addition of an amorphous cocatalyst with the nominal composition Fe(20)Cr(40)Ni(40...
Autores principales: | , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2017
|
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641740/ https://www.ncbi.nlm.nih.gov/pubmed/31457745 http://dx.doi.org/10.1021/acsomega.7b00696 |
_version_ | 1783436843472125952 |
---|---|
author | Bärtsch, Mario Sarnowska, Marta Krysiak, Olga Willa, Christoph Huber, Christian Pillatsch, Lex Reinhard, Sandra Niederberger, Markus |
author_facet | Bärtsch, Mario Sarnowska, Marta Krysiak, Olga Willa, Christoph Huber, Christian Pillatsch, Lex Reinhard, Sandra Niederberger, Markus |
author_sort | Bärtsch, Mario |
collection | PubMed |
description | [Image: see text] We present a sol–gel processed hematite–titania-based photoanode, which exhibits a photocurrent of up to 2.5 mA/cm(2) at 1.23 V(RHE) under simulated AM 1.5 G illumination (100 mW/cm(2)) thanks to the addition of an amorphous cocatalyst with the nominal composition Fe(20)Cr(40)Ni(40)O(x). To unveil the role of the cocatalyst interconnected to the photoanode, we performed impedance measurements. According to the one order of magnitude higher value for the capacitance associated with surface states (C(SS)) compared to the bare photoanode, the function of the catalyst−photoanode interface resembles that of a p−n-like junction. In addition, the charge transfer resistance associated with charge transfer processes from surface states (R(ct,ss)) was unchanged at potentials between 0.8 and 1.1 V(RHE) after adding the cocatalyst, indicating that the catalyst has a negligible effect on the hole transport to the electrolyte. The understanding of the role of oxygen evolution catalysts (OECs) in conjunction with the photoanodes is particularly important for water splitting because most OECs are studied separately at considerably higher potentials compared to the potentials at which photoanode materials are operated. |
format | Online Article Text |
id | pubmed-6641740 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66417402019-08-27 Multicomposite Nanostructured Hematite–Titania Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen Evolution Catalyst Bärtsch, Mario Sarnowska, Marta Krysiak, Olga Willa, Christoph Huber, Christian Pillatsch, Lex Reinhard, Sandra Niederberger, Markus ACS Omega [Image: see text] We present a sol–gel processed hematite–titania-based photoanode, which exhibits a photocurrent of up to 2.5 mA/cm(2) at 1.23 V(RHE) under simulated AM 1.5 G illumination (100 mW/cm(2)) thanks to the addition of an amorphous cocatalyst with the nominal composition Fe(20)Cr(40)Ni(40)O(x). To unveil the role of the cocatalyst interconnected to the photoanode, we performed impedance measurements. According to the one order of magnitude higher value for the capacitance associated with surface states (C(SS)) compared to the bare photoanode, the function of the catalyst−photoanode interface resembles that of a p−n-like junction. In addition, the charge transfer resistance associated with charge transfer processes from surface states (R(ct,ss)) was unchanged at potentials between 0.8 and 1.1 V(RHE) after adding the cocatalyst, indicating that the catalyst has a negligible effect on the hole transport to the electrolyte. The understanding of the role of oxygen evolution catalysts (OECs) in conjunction with the photoanodes is particularly important for water splitting because most OECs are studied separately at considerably higher potentials compared to the potentials at which photoanode materials are operated. American Chemical Society 2017-08-15 /pmc/articles/PMC6641740/ /pubmed/31457745 http://dx.doi.org/10.1021/acsomega.7b00696 Text en Copyright © 2017 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. |
spellingShingle | Bärtsch, Mario Sarnowska, Marta Krysiak, Olga Willa, Christoph Huber, Christian Pillatsch, Lex Reinhard, Sandra Niederberger, Markus Multicomposite Nanostructured Hematite–Titania Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen Evolution Catalyst |
title | Multicomposite Nanostructured Hematite–Titania
Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen
Evolution Catalyst |
title_full | Multicomposite Nanostructured Hematite–Titania
Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen
Evolution Catalyst |
title_fullStr | Multicomposite Nanostructured Hematite–Titania
Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen
Evolution Catalyst |
title_full_unstemmed | Multicomposite Nanostructured Hematite–Titania
Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen
Evolution Catalyst |
title_short | Multicomposite Nanostructured Hematite–Titania
Photoanodes with Improved Oxygen Evolution: The Role of the Oxygen
Evolution Catalyst |
title_sort | multicomposite nanostructured hematite–titania
photoanodes with improved oxygen evolution: the role of the oxygen
evolution catalyst |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641740/ https://www.ncbi.nlm.nih.gov/pubmed/31457745 http://dx.doi.org/10.1021/acsomega.7b00696 |
work_keys_str_mv | AT bartschmario multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT sarnowskamarta multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT krysiakolga multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT willachristoph multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT huberchristian multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT pillatschlex multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT reinhardsandra multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst AT niederbergermarkus multicompositenanostructuredhematitetitaniaphotoanodeswithimprovedoxygenevolutiontheroleoftheoxygenevolutioncatalyst |