Jump to main content
Jump to site search


Electrocatalytic Oxygen and Hydrogen Evolutions at Ni3B/Fe2O3 Nanotube Arrays under Visible Light Radiation

Abstract

We demonstrate that arrays of Ni3B/Fe2O3 nanotubes (NTAs) supported by a Fe foil can simultaneously boost the kinetics of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) after exposure to visible light radiation (OER and HER overpotentials decreased by 162 and 150 mV at 10 mA/cm2, respectively). With a small band gap, Fe2O3 efficiently harness solar energy for the overall photoelectrochemical water splitting. Consequently, a current density of 10 mA/cm2 requires only 1.50 V under one-sun illumination. Surface and spectroscopic analyses indicate that photoholes at the Fe2O3 NTAs transfer to Ni3B, rendering the Ni3B surface easier to oxidize to β-Ni(OH)2, which is ultimately converted to the OER-catalyzing γ-NiOOH species at a relatively low anodic potential. Photoelectrons become localized at the HER-active Ni sites in Ni3B. This work integrates photochemistry with electrocatalysis, affording a new avenue for developing high-performance and cost-effective photoelectrocatalysts for energy conversion applications.

Back to tab navigation

Supplementary files

Article information


Submitted
26 May 2020
Accepted
01 Oct 2020
First published
06 Oct 2020

Catal. Sci. Technol., 2020, Accepted Manuscript
Article type
Paper

Electrocatalytic Oxygen and Hydrogen Evolutions at Ni3B/Fe2O3 Nanotube Arrays under Visible Light Radiation

H. Zhao, M. Jiang, Q. Kang, L. Liu, N. Zhang, P. Wang and F. Zhou, Catal. Sci. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0CY01071E

Social activity

Search articles by author

Spotlight

Advertisements