Jump to main content
Jump to site search

Issue 48, 2019
Previous Article Next Article

Long-term stability studies of a semiconductor photoelectrode in three-electrode configuration

Author affiliations

Abstract

Improving the stability of semiconductor materials is one of the major challenges for sustainable and economic photoelectrochemical water splitting. N-terminated GaN nanostructures have emerged as a practical protective layer for conventional high efficiency but unstable Si and III–V photoelectrodes due to their near-perfect conduction band-alignment, which enables efficient extraction of photo-generated electrons, and N-terminated surfaces, which protects against chemical and photo-corrosion. Here, we demonstrate that Pt-decorated GaN nanostructures on an n+–p Si photocathode can exhibit an ultrahigh stability of 3000 h (i.e., over 500 days for usable sunlight ∼5.5 h per day) at a large photocurrent density (>35 mA cm−2) in three-electrode configuration under AM 1.5G one-sun illumination. The measured applied bias photon-to-current efficiency of 11.9%, with an excellent onset potential of ∼0.56 V vs. RHE, is one of the highest values reported for a Si photocathode under AM 1.5G one-sun illumination. This study provides a paradigm shift for the design and development of semiconductor photoelectrodes for PEC water splitting: stability is no longer limited by the light absorber, but rather by co-catalyst particles.

Graphical abstract: Long-term stability studies of a semiconductor photoelectrode in three-electrode configuration

Back to tab navigation

Supplementary files

Article information


Submitted
08 Sep 2019
Accepted
20 Nov 2019
First published
20 Nov 2019

J. Mater. Chem. A, 2019,7, 27612-27619
Article type
Paper

Long-term stability studies of a semiconductor photoelectrode in three-electrode configuration

S. Vanka, K. Sun, G. Zeng, T. A. Pham, F. M. Toma, T. Ogitsu and Z. Mi, J. Mater. Chem. A, 2019, 7, 27612
DOI: 10.1039/C9TA09926C

Social activity

Search articles by author

Spotlight

Advertisements