Microporous nickel phosphonate derived heteroatom doped nickel oxide and nickel phosphide: Efficient electrocatalysts for oxygen evolution reaction
Microporous nickel phosphonate derived heteroatom doped nickel oxide and nickel phosphide: Efficient electrocatalysts for oxygen evolution reaction
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DOI：
10.1016/j.cej.2020.126803
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发表时间：
2021-02-01
影响因子：
15.1
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Bhanja, Piyali;Kim, Yena;Yamauchi, Yusuke
设计基于丰富元素的低成本高效电催化剂是未来绿色能源生产的迫切需要。过渡金属氧化物和磷化物由于其独特的表面性质和良好的导电性，最近被证明是有前途的和具有成本效益的电催化剂。本文在不使用结构导向剂的情况下，在水热反应条件下合成了一种新型的微孔有机-无机杂化膦酸镍（NiPPA）材料。微孔NiPPA材料在空气和氮气气氛下热解后，可分别转化为N， p共掺杂氧化镍（NP/NiO）和N， o共掺杂磷化镍（NO/NiP）。这些高表面积材料随后被探索作为电催化剂在碱性介质中的析氧反应（OER）。三种催化剂中，NP/NiO对OER的电催化活性最高，过电位为332 mV，在1.0 M KOH溶液中达到10 mA cm（-2）的电流密度，Tafel斜率低，为65.6 mV dec（-1）。此外，制备的NP/NiO催化剂在15小时内表现出出色的稳定性，表明该催化剂具有较高的OER耐久性。
Designing low-cost and highly efficient electrocatalysts based on widely abundant elements is highly desirable for future green energy production. Transition metal oxides and phosphides have recently been demonstrated to be promising and cost-effective electrocatalysts due to their distinct surface properties and good conductivity. Herein, we have synthesized a new microporous organic-inorganic hybrid nickel phosphonate (NiPPA) material under hydrothermal reaction condition without the use of structure directing agent. The microporous NiPPA material can be converted to N, P-codoped nickel oxide (NP/NiO) and N, O-codoped nickel phosphide (NO/NiP) following pyrolysis under air and nitrogen atmospheres, respectively. These high surface area materials are subsequently explored as electrocatalysts towards oxygen evolution reaction (OER) in alkaline media. Among the three catalysts, NP/NiO exhibits the highest electrocatalytic activity for OER with an overpotential of 332 mV to reach a current density of 10 mA cm(-2) and a low Tafel slope of 65.6 mV dec(-1) in 1.0 M KOH solution. Furthermore, the as-prepared NP/NiO catalyst displays an outstanding stability over a period of 15 h, suggesting the high durability of this catalyst for OER.