Arunkumar Paulraj, Gayathri Sampath, Han Jong Hun
School of Chemical Engineering, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju, 61186, Republic of Korea.
ChemSusChem. 2021 Apr 22;14(8):1921-1935. doi: 10.1002/cssc.202100116. Epub 2021 Feb 12.
Echinops-like bimetallic CoNiP-CoNi alloy is synthesized from a metal-organic framework (MOF) and serves as an efficient catalyst for the oxygen evolution reaction (OER), with a low overpotential of 300 mV in 1 M KOH at 10 mA cm (η ). The cooperative effect of Ni and Co metal, as well as the interfacial properties of the integrated semiconducting phosphide/metallic alloy and electronic conductivity of the MOF-derived carbon regulate the performance of the catalyst. Moreover, the bimetallic CoNiP/CoNi alloy catalyst is interspersed with N-doped graphene, forming a triad catalyst that demonstrates superior activity towards the hydrogen evolution reaction (η =150 mV) and excellent durability, owing to interfacial effects of the triad catalyst, large electrochemical active surface area, and enhanced conductivity from N-doped graphene. The stability of the carbon-containing catalyst during OER (oxidation) is altered by the high reactivity of heteroatom dopant. The assembled CoNiP/CoNi/N-RGO||CoNiP/CoNi water electrolyzer delivers a reasonable cell potential of 1.76 V at 10 mA cm . The synthesized bimetallic CoNiP/CoNi alloy-based triad catalyst thus demonstrates excellent electrocatalytic activity and high durability suitable for efficient alkaline water splitting.
类刺头菊属的双金属CoNiP-CoNi合金由金属有机框架（MOF）合成，用作析氧反应（OER）的高效催化剂，在1 M KOH中，10 mA cm时过电位低至300 mV（η）。Ni和Co金属的协同效应，以及集成的半导体磷化物/金属合金的界面性质和MOF衍生碳的电子导电性调节了催化剂的性能。此外，双金属CoNiP/CoNi合金催化剂与N掺杂石墨烯穿插，形成了一种三元催化剂，由于三元催化剂的界面效应、大的电化学活性表面积以及N掺杂石墨烯增强的导电性，该催化剂对析氢反应表现出优异的活性（η =150 mV）和出色的耐久性。含碳催化剂在OER（氧化）过程中的稳定性因杂原子掺杂剂的高反应性而改变。组装的CoNiP/CoNi/N-RGO||CoNiP/CoNi水电解槽在10 mA cm时提供了1.76 V的合理电池电位。因此，合成的基于双金属CoNiP/CoNi合金的三元催化剂表现出优异的电催化活性和高耐久性，适用于高效碱性水分解。
