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Electrodeposited Amorphous Tungsten‐doped Cobalt Oxide as an Efficient Catalyst for the Oxygen Evolution Reaction |
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| Authors: | Linh N Nguyen Dr Ung Thi Dieu Thuy Dr Quang Duc Truong Prof Itaru Honma Prof Quang Liem Nguyen Dr Phong D Tran |
| Institution: | 1. Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam;2. University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, Hanoi, Vietnam;3. Institute of Multidisciplinary Research for Advanced Materials, Tohoky University, Sendai, Japan;4. Department of Chemistry, Hanyang University, Seoul, Republic of Korea |
| 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 |