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Photoelectrochemical Performance of BiVO_4 Photoanodes Integrated with [NiFe]-Layered Double Hydroxide Nanocatalysts

Sinclair, Timothy S. and Gray, Harry B. and Müller, Astrid M. (2018) Photoelectrochemical Performance of BiVO_4 Photoanodes Integrated with [NiFe]-Layered Double Hydroxide Nanocatalysts. European Journal of Inorganic Chemistry, 2018 (9). pp. 1060-1067. ISSN 1434-1948. http://resolver.caltech.edu/CaltechAUTHORS:20171101-124030260

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Abstract

We immobilized laser-made nickel iron layered double hydroxide ([NiFe]-LDH) nanocatalysts on BiVO_4 photoanodes. We compared photoelectrochemical performance of integrated [NiFe]-LDH–BiVO_4 photoanodes in sulfite-free aqueous electrolyte with photocurrent generation of neat BiVO_4 photoanodes in aqueous electrolyte with sulfite added as sacrificial hole acceptor. We optimized catalyst mass loading, which is a tradeoff between most efficient depletion of photogenerated holes that drive catalytic turnover and parasitic light absorption by the catalyst particles. We also mitigated nanocatalyst aggregation on the BiVO_4 surface by a surfactant that selectively ligated the catalysts or by dispersing the catalyst suspension more rapidly on the photoanode surface. Our rational optimization strategies enhanced photoelectrochemical performance of integrated nanocatalyst photoanodes: Two thirds of all photogenerated holes escaped loss processes in our optimized integrated [NiFe]-LDH–BiVO_4 photoanodes under 100 mW cm^(–2) of simulated air mass 1.5 G illumination in aqueous pH 9.2 buffered electrolyte. Our systematic optimization strategies for integration of highly efficient water oxidation nanocatalysts with a visible-light absorber provide a path towards functional artificial photosynthesis devices.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/ejic.201701231DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/ejic.201701231/abstractPublisherArticle
Additional Information:© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Issue online: 1 March 2018; Version of record online: 6 December 2017; Accepted manuscript online: 31 October 2017; Manuscript Received: 18 October 2017. We thank Chi Ma and June Wicks for help with SEM imaging and EDS mapping, and George Rossman for help with reflectance measurements. Research was carried out in the Laser Resource Center and the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. T. S. S. acknowledges the Caltech SURF office, a Dr. Terry Cole SURF Fellowship, and a Jack and Edith Roberts SURF Fellowship. The National Science Foundation (NSF) CCI Solar Fuels Program (CHE-1305124) and the Arnold and Mabel Beckman Foundation supported this work.
Group:CCI Solar Fuels
Funders:
Funding AgencyGrant Number
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
NSFCHE-1305124
Arnold and Mabel Beckman FoundationUNSPECIFIED
Subject Keywords:Artificial photosynthesis; Bismuth; Vanadium; Nanoparticles; Photocatalysis; Electrochemistry
Record Number:CaltechAUTHORS:20171101-124030260
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171101-124030260
Official Citation:Sinclair, T. S., Gray, H. B. and Müller, A. M. (2018), Photoelectrochemical Performance of BiVO4 Photoanodes Integrated with [NiFe]-Layered Double Hydroxide Nanocatalysts. Eur. J. Inorg. Chem., 2018: 1060–1067. doi:10.1002/ejic.201701231
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82837
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Nov 2017 19:46
Last Modified:01 Mar 2018 21:26

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