CaltechAUTHORS
  A Caltech Library Service

Evaluation of sputtered nickel oxide, cobalt oxide and nickel–cobalt oxide on n-type silicon photoanodes for solar-driven O₂(g) evolution from water

Yang, Fan and Zhou, Xinghao and Plymale, Noah T. and Sun, Ke and Lewis, Nathan S. (2020) Evaluation of sputtered nickel oxide, cobalt oxide and nickel–cobalt oxide on n-type silicon photoanodes for solar-driven O₂(g) evolution from water. Journal of Materials Chemistry A, 8 (28). pp. 13955-13963. ISSN 2050-7488. https://resolver.caltech.edu/CaltechAUTHORS:20200713-130247847

[img] PDF - Supplemental Material
See Usage Policy.

1201Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20200713-130247847

Abstract

Thin films of nickel oxide (NiO_x), cobalt oxide (CoO_x) and nickel–cobalt oxide (NiCoO_x) were sputtered onto n-Si(111) surfaces to produce a series of integrated, protected Si photoanodes that did not require deposition of a separate heterogeneous electrocatalyst for water oxidation. The p-type transparent conductive oxides (p-TCOs) acted as multi-functional transparent, antireflective, electrically conductive, chemically stable coatings that also were active electrocatalysts for the oxidation of water to O₂(g). Relative to the formal potential for water oxidation to O₂, E^(o′)(O₂/H₂O), under simulated Air Mass (AM)1.5 illumination the p-TCO-coated n-Si(111) photoanodes produced mutually similar open-circuit potentials of −270 ± 20 mV, but different photocurrent densities at E^(o′)(O₂/H₂O), of 28 ± 0.3 mA cm⁻² for NiO_x, 18 ± 0.3 mA cm⁻² for CoO_x and 24 ± 0.5 mA cm⁻² for NiCoO_x. The p-TCOs all provided protection from oxide growth for extended time periods, and produced stable photocurrent densities from n-Si in 1.0 M KOH(aq) (ACS grade) under potential control at E^(o′)(O₂/H₂O) for >400 h of continuous operation under 100 mW cm−2 of simulated AM1.5 illumination.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1039/d0ta03725gDOIArticle
http://www.rsc.org/suppdata/d0/ta/d0ta03725g/d0ta03725g1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Zhou, Xinghao0000-0001-9229-7670
Plymale, Noah T.0000-0003-2564-8009
Sun, Ke0000-0001-8209-364X
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2020 The Royal Society of Chemistry. Received 8th April 2020; Accepted 26th June 2020; First published 30 Jun 2020. This work was supported through the Office of Science of the U.S. Department of Energy (DOE) under award DE-SC0004993 to the Joint Center for Artificial Photosynthesis (JCAP), a DOE funded Energy Innovation Hub. UV-vis absorption and Atomic Force Microscope studies were performed at the Molecular Materials Resource Center (MMRC) in the Beckman Institute at the California Institute of Technology. Paul Kempler and Weilai Yu are thanked for assistance with editing the manuscript. There are no conflicts to declare.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Issue or Number:28
Record Number:CaltechAUTHORS:20200713-130247847
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200713-130247847
Official Citation:Evaluation of sputtered nickel oxide, cobalt oxide and nickel–cobalt oxide on n-type silicon photoanodes for solar-driven O₂(g) evolution from water. J. Mater. Chem. A, 2020, 8, 13955-13963; doi: 10.1039/d0ta03725g
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104358
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jul 2020 20:15
Last Modified:22 Jul 2020 21:06

Repository Staff Only: item control page