Mesoporous Nanosheet Networked Hybrids of Cobalt Oxide and Cobalt Phosphate for Efficient Electrochemical and Photoelectrochemical Oxygen Evolution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

50 Scopus Citations
View graph of relations

Author(s)

  • Bin Liu
  • Hui-Qing Peng
  • Hongtao Xue
  • Shuilin Wu
  • Tsz-Wai Ng

Detail(s)

Original languageEnglish
Article number1701875
Journal / PublicationSmall
Volume13
Issue number43
Online published18 Sep 2017
Publication statusPublished - 20 Nov 2017

Abstract

A novel mesoporous nanosheet networked hybrid comprising Co3O4 and Co3(PO4)2 is successfully synthesized using a facile and scalable method through calcinating the carbon, cobalt hydroxy carbonate, and cobalt phosphate composite precursor. Electron transfer from Co3O4 to Co3(PO4)2, together with the special networked structure and the porous nature of the nanosheets enable the Co3(PO4)2-Co3O4 hybrid to have a high oxygen evolution reaction (OER) activity and outstanding stability in alkaline electrolyte, e.g., an overpotential of 270 mV at current density of 10 mA cm−2, and a Tafel slope of 39 mV dec−1, which are superior to most non-noble metal-based OER electrocatalysts reported thus far and as well the commercial RuO2 electrocatalyst. Furthermore, Co3(PO4)2-Co3O4 hybrid is demonstrated to be used as an efficient cocatalyst to enhance the photoelectrochemical OER performance of BiVO4 photoanode. A significantly increased photocurrent density of 3.0 mA cm−2 at 1.23 V (vs reversible hydrogen electrode, RHE), and a potential reduction of 530 mV with respect to that of bare BiVO4 at the photocurrent density of 0.5 mA cm−2 are achieved. The electron transfer-induced enhancement of OER by a hybrid structure may pave the new routes for the design and synthesis of low-cost catalysts for electrochemical and photoelectrochemical oxygen evolution.

Research Area(s)

  • electrocatalysis, electron transfer induced enhancement, hybrid structure, oxygen evolution, photoelectrocatalysis

Citation Format(s)

Mesoporous Nanosheet Networked Hybrids of Cobalt Oxide and Cobalt Phosphate for Efficient Electrochemical and Photoelectrochemical Oxygen Evolution. / Liu, Bin; Peng, Hui-Qing; Ho, Cheuk-Nam; Xue, Hongtao; Wu, Shuilin; Ng, Tsz-Wai; Lee, Chun-Sing; Zhang, Wenjun.

In: Small, Vol. 13, No. 43, 1701875, 20.11.2017.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review