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Nanostructuring Strategies To Increase the Photoelectrochemical Water Splitting Activity of Silicon Photocathodes
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Document Title
Nanostructuring Strategies To Increase the Photoelectrochemical Water Splitting Activity of Silicon Photocathodes
Author
Hellstern TR, Nielander AC, Chakthranont P, King LA, Willis JJ, Xu SC, MacIsaac C, Hahn C, Bent SF, Prinz FB, Jaramillo TF
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Affiliations
Stanford University; National Science & Technology Development Agency - Thailand; National Nanotechnology Center (NANOTEC); Stanford University; Stanford University
Type
Article
Source Title
ACS APPLIED NANO MATERIALS
ISSN
2574-0970
Year
2019
Volume
2
Open Access
Green Accepted
Publisher
AMER CHEMICAL SOC
DOI
10.1021/acsanm.8b01966
Format
Abstract
Photoelectrochemical water splitting is a promising route for sustainable hydrogen production. Herein, we demonstrate a photoelectrode motif that enables a nanostructured large-surface area electrocatalyst without requiring a nanostructured semiconductor surface with the goal of promoting electrocatalysis while minimizing surface recombination. We compare the photoelectrochemical H-2 evolution activity of two silicon photocathode nanostructuring strategies: (1) direct nanostructuring of the silicon surface and (2) incorporation of nanostructured zinc oxide to increase the electrocatalyst surface area on planar silicon. We observed that silicon photocathodes that utilized nanostructured ZnO supports outperformed nanostructured silicon electrodes by similar to 50 mV at open circuit under 1 sun illumination and demonstrated comparable electrocatalytic activity.
Funding Sponsor
Department of Energy [DE-EE0006670]; National Science Foundation [ECCS-1542152]; National Science Foundation
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Publication Source
WOS