A Complementary Co−Ni Phosphide/Bimetallic Alloy‐Interspersed N‐Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting,ChemSusChem

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A Complementary Co−Ni Phosphide/Bimetallic Alloy‐Interspersed N‐Doped Graphene Electrocatalyst for Overall Alkaline Water Splitting
ChemSusChem ( IF 7.5 ) Pub Date : 2021-01-20 , DOI: 10.1002/cssc.202100116
Arunkumar Paulraj ₁ , Gayathri Sampath ₂ , Jong Hun HAN ₃

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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⁻² (η₁₀). 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 (η₁₀=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⁻². The synthesized bimetallic CoNiP/CoNi alloy‐based triad catalyst thus demonstrates excellent electrocatalytic activity and high durability suitable for efficient alkaline water splitting.

中文翻译：

互补的钴镍磷化物/双金属合金散布的N掺杂石墨烯电催化剂，用于整体碱水分解

蓝刺状双金属的CoNiP-的CoNi合金是从金属-有机构架（MOF）合成并在1M KOH用作析氧反应（OER）的有效催化剂，具有低的超电势为300mV的在10mA厘米^{- 2}（η ₁₀）。镍和钴金属的协同作用，以及集成的半导电磷化物/金属合金的界面性质和MOF衍生碳的电子电导率，都可调节催化剂的性能。另外，双金属的CoNiP /的CoNi合金催化剂散布有N型掺杂的石墨烯，形成演示朝向析氢反应优良活性的三元组催化剂（η ₁₀= 150 mV）和优异的耐久性，这归因于三元组催化剂的界面效应，大的电化学活性表面积以及N掺杂石墨烯的增强电导率。杂原子掺杂剂的高反应性改变了含碳催化剂在OER（氧化）过程中的稳定性。组装好的CoNiP / CoNi / N-RGO || CoNiP / CoNi水电解槽在10 mA cm ^-2时提供了1.76 V的合理电池电势。因此，合成的基于双金属CoNiP / CoNi合金的三元组催化剂表现出出色的电催化活性和高耐久性，适用于有效的碱性水分解。

更新日期：2021-01-20

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