过电位
分解水
析氧
电催化剂
双功能
材料科学
催化作用
化学工程
电化学
纳米片
金属有机骨架
无机化学
化学
纳米技术
电极
物理化学
有机化学
光催化
吸附
工程类
作者
Tran Van Phuc,Jayasmita Jana,Ravi Nivetha,Sung Gu Kang,Jin Suk Chung,Won Mook Choi,Seung Hyun Hur
标识
DOI:10.1016/j.ijhydene.2022.05.097
摘要
Rational design of electrocatalycally active materials with excellent performance for renewable energy conversion is of great interest. We have developed a nanosheet array of Ni/Co metal-organic framework (MOF) grown on CoO modified Ni foam (CoO/NF) substrate via the solvothermal process. The high surface area and low resistance of Ni/[email protected]/NF ([email protected]/NF) catalyst contribute to efficient water splitting. We have prepared a series of NC-n/CoO/NF (n = 1–4) catalysts to optimize the molar ratio of the Co atom in Ni MOF-74. Among them, [email protected]/NF shows an excellent electrochemical performance in alkaline medium, i.e., low overpotential of 290 and 139 mV for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. For a two-electrode system with [email protected]/NF, a low cell voltage of 1.54 V at 10 mA cm−2 has been obtained for overall water splitting which is much smaller than that with commercial Ir/C– Pt/C pair. This excellent performance can be attributed to the synergistic effects of Ni/Co-MOF and CoO/NF. In addition, the as-prepared [email protected]/NF exhibits excellent long-term stability. The computational simulation also supports experimental results.
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