Converting CoMoO4 into CoO/MoOx for Overall Water Splitting by Hydrogenation

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• 作者：Xiaodong Yan ; Lihong Tian ; Samuel Atkins ; Yan Liu ; James Murowchick ; Xiaobo Chen
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：July 5, 2016
• 年：2016
• 卷：4
• 期：7
• 页码：3743-3749
• 全文大小：494K
• 年卷期：0
• ISSN：2168-0485

文摘

Special structures of materials often bring in unprecedented catalytic activities, which are critical in realizing large-scale hydrogen production by electrochemical water splitting. Herein, we report a CoO/MoO_x crystalline/amorphous structure as an effective bifunctional electrocatalyst for water splitting. Converted from CoMoO₄ by hydrogenation, the CoO/MoO_x, featured with crystalline CoO in amorphous MoO_x matrix, displays superior catalytic activities toward both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). It shows small onset overpotentials of 40 and 230 mV for the HER and OER in 1.0 M KOH, respectively, and overall water splitting starting at 1.53 V with a robust stability. The high catalytic activity of the CoO/MoO_x is benefited from the large defect-rich interface between CoO and MoO_x, along with the amorphous nature of MoO_x. Thus, this study demonstrates the effectiveness of structural manipulation in developing highly active electrocatalysts for overall electrochemical water splitting.