Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Evaluation of Sputtered Nickel Oxide, Cobalt Oxide and Nickel-Cobalt Oxide on n-type Silicon Photoanodes for Solar-Driven O2(g) Evolution from Water

Abstract

Thin films of Nickel oxide (NiOx), Cobalt oxide (CoOx) and Nickel-cobalt oxide (NiCoOx) 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, Eo’(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 Eo’(O2/H2O), of 28 ± 0.3 mA cm–2 for NiOx, 18 ± 0.3 mA cm–2 for CoOx and 24 ± 0.5 mA cm–2 for NiCoOx. 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 Eo’(O2/H2O) for >400 h of continuous operation under 100 mW cm-2 of simulated AM1.5 illumination.

Back to tab navigation

Supplementary files

Article information


Submitted
08 Apr 2020
Accepted
26 Jun 2020
First published
30 Jun 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Communication

Evaluation of Sputtered Nickel Oxide, Cobalt Oxide and Nickel-Cobalt Oxide on n-type Silicon Photoanodes for Solar-Driven O2(g) Evolution from Water

F. Yang, X. Zhou, N. Plymale, K. Sun and N. Lewis, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/D0TA03725G

Social activity

Search articles by author

Spotlight

Advertisements