eprintid: 1546806
rev_number: 43
eprint_status: archive
userid: 608
dir: disk0/01/54/68/06
datestamp: 2017-04-01 08:20:23
lastmod: 2021-12-13 02:44:43
status_changed: 2017-04-25 15:45:53
type: article
metadata_visibility: show
creators_name: Kafizas, A
creators_name: Francas, L
creators_name: Sotelo-Vazquez, C
creators_name: Ling, M
creators_name: Li, Y
creators_name: Glover, E
creators_name: McCafferty, L
creators_name: Blackman, C
creators_name: Darr, J
creators_name: Parkin, I
title: Optimizing the Activity of Nanoneedle Structured WO3 Photoanodes for Solar Water Splitting: Direct Synthesis via Chemical Vapor Deposition
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F56
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Solar water splitting is a promising solution for the renewable production of hydrogen as an energy vector. To date, complex or patterned photoelectrodes have shown the highest water splitting efficiencies, but lack scalable routes for commercial scale-up. In this article, we report a direct and scalable chemical vapor deposition (CVD) route at atmospheric pressure, for a single step fabrication of complex nanoneedle structured WO3 photoanodes. Using a systematic approach, the nanostructure was engineered to find the conditions that result in optimal water splitting. The nanostructured materials adopted a monoclinic γ-WO3 structure and were highly oriented in the (002) plane, with the nanoneedle structures stacking perpendicular to the FTO substrate. The WO3 photoanode that showed the highest water splitting activity was composed of a ∼300 nm seed layer of flat WO3 with a ∼5 μm thick top layer of WO3 nanoneedles. At 1.23 VRHE, this material showed incident photon-to-current efficiencies in the range ∼35–45% in the UV region (250–375 nm) and an overall solar predicted photocurrent of 1.24 mA·cm–2 (∼25% of the theoretical maximum for WO3). When coupled in tandem with a photovoltaic device containing a methylammonium lead iodide perovskite, a solar-to-hydrogen efficiency of ca. 1% for a complete unassisted water splitting device is predicted.
date: 2017-03-23
date_type: published
publisher: AMER CHEMICAL SOC
official_url: http://dx.doi.org/10.1021/acs.jpcc.7b00533
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_id: 1276643
doi: 10.1021/acs.jpcc.7b00533
lyricists_name: Blackman, Christopher
lyricists_name: Darr, Jawwad
lyricists_name: Glover, Emily
lyricists_name: Li, Yaomin
lyricists_name: Ling, Min
lyricists_name: McCafferty, Liam
lyricists_name: Parkin, Ivan
lyricists_name: Sotelo-Vazquez, Carlos
lyricists_id: CBLAC43
lyricists_id: JDARR17
lyricists_id: ENKGL52
lyricists_id: YLIDX67
lyricists_id: MLING88
lyricists_id: LMCCA06
lyricists_id: IPPAR53
lyricists_id: SOTEL29
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: Journal of Physical Chemistry C
volume: 121
number: 11
pagerange: 5983-5993
pages: 11
issn: 1932-7447
citation:        Kafizas, A;    Francas, L;    Sotelo-Vazquez, C;    Ling, M;    Li, Y;    Glover, E;    McCafferty, L;             ... Parkin, I; + view all <#>        Kafizas, A;  Francas, L;  Sotelo-Vazquez, C;  Ling, M;  Li, Y;  Glover, E;  McCafferty, L;  Blackman, C;  Darr, J;  Parkin, I;   - view fewer <#>    (2017)    Optimizing the Activity of Nanoneedle Structured WO3 Photoanodes for Solar Water Splitting: Direct Synthesis via Chemical Vapor Deposition.                   Journal of Physical Chemistry C , 121  (11)   pp. 5983-5993.    10.1021/acs.jpcc.7b00533 <https://doi.org/10.1021/acs.jpcc.7b00533>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1546806/1/Kafizaz_Optimizing_Activity_Nanoneedle.pdf