Jump to main content
Jump to site search


Design of ultralong single-crystal nanowire-based bifunctional electrodes for efficient oxygen and hydrogen evolution in a mild alkaline electrolyte

Author affiliations

Abstract

Rational design of bifunctional electrodes that efficiently pair oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in a single system is critical for electrocatalytic pure oxygen and hydrogen generation and overall water splitting. Herein, we report a novel biomimetic architectural design and development of 3D flexible electrodes with high electrocatalytic activity and durability in a mild alkaline system. Benefiting from the ultralong single-crystal Co-doped ZnO nanowires densely and in situ grown on highly conductive carbon fabric, the novel material and unique composite electrode architecture favor the direct electrochemical water splitting process over the conventionally fabricated electrodes by providing abundant active sites, efficient electron transfer pathways, and sufficient gas exchange channels. A low overpotential of 360 and 275 mV is required to reach a current density of 10 mA cm−2 for OER and HER, respectively. When these thick electrodes are used as electrocatalysts for both anode and cathode in an overall water electrolyzer, a low cell voltage of 1.90 V and 2.06 V is required to reach a current density of 4.0 and 10.0 mA cm−2, respectively, with an extremely long durability. Such a single-cell prototype exhibiting superior performance to noble metal-based precious catalyst counterparts holds great promise in future practical applications for pure hydrogen generation.

Graphical abstract: Design of ultralong single-crystal nanowire-based bifunctional electrodes for efficient oxygen and hydrogen evolution in a mild alkaline electrolyte

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 29 Mar 2017, accepted on 04 May 2017 and first published on 04 May 2017


Article type: Paper
DOI: 10.1039/C7TA02745A
Citation: J. Mater. Chem. A, 2017, Advance Article
  •   Request permissions

    Design of ultralong single-crystal nanowire-based bifunctional electrodes for efficient oxygen and hydrogen evolution in a mild alkaline electrolyte

    G. Li, X. Wang, M. H. Seo, S. Hemmati, A. Yu and Z. Chen, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02745A

Search articles by author