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Surface engineered CoP/Co3O4 heterojunction for high-performance bi-functional water splitting electro-catalysis
Nanoscale ( IF 6.7 ) Pub Date : 2021-11-10 , DOI: 10.1039/d1nr06044a
Xintong Li, Yizhe Liu, Qidi Sun, Wei-Hsiang Huang, Zilong Wang, Chu-Chen Chueh, Chi-Liang Chen, Zonglong Zhu

In the electrochemical water splitting process, integrating hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte with the same catalyst is highly beneficial for increasing the energy efficiency and reducing the fabrication cost. However, most OER catalysts are unstable in the acidic solution, while HER shows poor kinetics in the alkaline solution, which hinders the scale-up application of electro-catalytic water splitting. In this work, a CoP/Co3O4 heterostructure is firstly fabricated and then O and P defects are introduced via surface engineering (s-CoP/Co3O4). The as-prepared material was employed as the catalyst towards electrochemical water splitting in an alkaline environment. In alkaline HER, a current density of −10 mA cm−2 can be achieved at an overpotential of 106 mV vs. RHE. In the OER process, the overpotential of s-CoP/Co3O4 electrode is only 211 mV vs. RHE at 10 mA cm−2 in 1 M KOH, and the corresponding Tafel slope is only 58.4 mV dec−1 so that the s-CoP/Co3O4 electrode could be used as the bifunctional catalyst for alkaline water splitting. This work provides a simple and low-cost approach to fabricate a Co-based heterojunction electrode with unsaturated metal sites to improve the electro-catalytic activities towards water splitting.

中文翻译:

用于高性能双功能水分解电催化的表面工程 CoP/Co3O4 异质结

在电化学水分解过程中,将析氢反应(HER)和析氧反应(OER)结合在同一电解质和相同的催化剂中对于提高能量效率和降低制造成本非常有利。然而,大多数OER催化剂在酸性溶液中不稳定,而HER在碱性溶液中表现出较差的动力学,这阻碍了电催化水分解的放大应用。在这项工作中,首先制造了 CoP/Co 3 O 4异质结构,然后通过表面工程引入了 O 和 P 缺陷(s-CoP/Co 3 O 4)。所制备的材料用作在碱性环境中电化学分解水的催化剂。在碱性 HER 中,相对于RHE ,在 106 mV 的过电位下可以实现-10 mA cm -2的电流密度。在OER过程中,s-CoP/Co 3 O 4电极在1 M KOH中10 mA cm -2 时的过电位相对于RHE仅为211 mV ,相应的Tafel斜率仅为58.4 mV dec -1,因此s-CoP/Co 3 O 4电极可用作碱性水分解的双功能催化剂。这项工作提供了一种简单且低成本的方法来制造具有不饱和金属位点的 Co 基异质结电极,以提高电催化分解水的活性。
更新日期:2021-11-24
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