Exceptional Performance of MOF-Derived N‑Doped CoP and Fe-Doped CoOOH Ultrathin Nanosheets Electrocatalysts for Overall Water Splitting
Exceptional Performance of MOF-Derived N‑Doped CoP and Fe-Doped CoOOH Ultrathin Nanosheets Electrocatalysts for Overall Water Splitting
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MOF 衍生的 N 掺杂 CoP 和 Fe 掺杂 CoOOH 超薄纳米片电催化剂用于整体水分解的卓越性能
DOI：
10.1021/acssuschemeng.0c01293
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Wang Baoguo
中科院分区：
文献类型：
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作者：
Peican Wang;Ziang Xu;Yuqun Lin;Lei Wan;Wang Baoguo
电化学水裂解制氢是一种重要的可持续发展的制氢技术。寻找低成本、高效率的析氢/析氧电催化剂对水电解的工业化应用具有重要意义。钴基磷化物和氧化物/氢氧化物分别被广泛开发为HER和OER电催化剂。在此，开发了一种新的策略来制备用于HER的自支撑N掺杂的CoP纳米片（即N-Co-Ni-P/Ni）和用于OER的Fe掺杂的CoOOH纳米片（即Fe-Co-OOH/Ni），其基于MOF衍生的Co（OH）2纳米片，沿着由Co-MOF限制生长引起的短横向尺寸。在碱性条件下（1 M），自负载N-Co-Ni-P催化剂的过电位为50 mV，电流密度为10 mA cm-2，自负载Fe-Co-OOH纳米片电催化剂对OER也表现出较高的催化活性。实验结果表明，N原子的引入增加了Co原子的正电荷，从而显著提高了HER性能。此外，大的比表面积、高的活性中心暴露和有效的传质通道也有利于提高催化活性。N-Co-Ni-P/Ni和Fe-Co-OOH组成的电解槽在10 mA cm-2下的电解电压为1.51 V，表现出优异的活性，优于Pt（-）//Ir/Ta（+）电解槽（1.62 V）的上级性能。
Electrochemical water splitting is deemed as an important and sustainable technology for hydrogen generation. Searching for low-cost and efficient electrocatalysts toward hydrogen/oxygen evolution reaction (HER/OER) is of great importance for commercial application of water electrolysis. Co-based phosphides and oxides/hydroxides are extensively developed as HER and OER electrocatalysts, respectively. Herein, a novel strategy is developed to prepare a self-supported N-doped CoP ultrathin nanosheets (namely N–Co–Ni–P/Ni) for HER and Fe-doped CoOOH nanosheets (namely Fe–Co–OOH/Ni) for OER based on the MOF-derived Co(OH)2nanosheets, along with short lateral size caused by Co-MOF confinement growth. The self-supported N–Co–Ni–P demands an overpotential of 50 mV to deliver a current density of 10 mA cm–2in alkaline conditions (1M) for HER. The self-supported Fe–Co–OOH nanosheet electrocatalysts also exhibit high catalytic activity for OER. The experimental measurements demonstrate that the increased positive charge of Co atoms caused by the introduction of N atoms can significantly enhance HER performance. Moreover, the large surface areas, high exposure of active sites, and effective mass transport channels are also favorable to improved catalytic activity. The electrolyzer with N–Co–Ni–P/Ni and Fe–Co–OOH shows excellent activity with an electrolysis voltage of 1.51 V at 10 mA cm–2, which is superior to the Pt(−)//Ir/Ta (+) electrolyzer (1.62 V).