Electrodeposited Amorphous Tungsten-doped Cobalt Oxide as an Efficient Catalyst for the Oxygen Evolution Reaction

Linh N Nguyen; Ung Thi Dieu Thuy; Quang Duc Truong; Itaru Honma; Quang Liem Nguyen; Phong D Tran

doi:10.1002/asia.201800401

Electrodeposited Amorphous Tungsten-doped Cobalt Oxide as an Efficient Catalyst for the Oxygen Evolution Reaction

Chem Asian J. 2018 Jun 18;13(12):1530-1534. doi: 10.1002/asia.201800401. Epub 2018 May 29.

Authors

Linh N Nguyen^{1

2}, Ung Thi Dieu Thuy¹, Quang Duc Truong³, Itaru Honma³, Quang Liem Nguyen¹, Phong D Tran^{2

4}

Affiliations

¹ Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, 100000, Hanoi, Vietnam.
² University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, 100000, Hanoi, Vietnam.
³ Institute of Multidisciplinary Research for Advanced Materials, Tohoky University, Sendai, 980-8577, Japan.
⁴ Department of Chemistry, Hanyang University, Seoul, 04763, Republic of Korea.

PMID: 29708656
DOI: 10.1002/asia.201800401

Abstract

Thin film of amorphous tungsten-doped cobalt oxide (W:CoO) was successfully grown on a conducting electrode via an electrochemical oxidation process employing a [Co(WS₄ )₂ ]^2- deposition bath. The W:CoO catalyst displays an attractive performance for the oxygen evolution reaction in an alkaline solution. In an NaOH solution of pH 13, W:CoO operates with a moderate onset overpotential of 230 mV and requires 320 mV overpotential to generate a catalytic current density of 10 mA cm^-2 . A low Tafel slope of 45 mV decade^-1 was determined, indicating a rapid O₂ -evolving kinetics. The as-prepared W:CoO belongs to the best cobalt oxide-based catalysts ever reported for the oxygen evolution (OER) reaction.

Keywords: catalyst activation; cobalt oxide; electrocatalysis; solar water splitting; tetrathiotungstate.