Nickel iron phosphide ultrathin nanosheets anchored on nitrogen-doped carbon nanoflake arrays as a bifunctional catalyst for efficient overall water splitting
Nickel iron phosphide ultrathin nanosheets anchored on nitrogen-doped carbon nanoflake arrays as a bifunctional catalyst for efficient overall water splitting
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锚定在氮掺杂碳纳米片阵列上的镍铁磷化物超薄纳米片作为高效整体水分解的双功能催化剂
DOI：
10.1039/c9nr10471b
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发表时间：
2020-04-21
期刊：
影响因子：
6.7
通讯作者：
Cheng, Chuanwei
中科院分区：
文献类型：
--
作者：
Bian, Jialin;Song, Zeyi;Cheng, Chuanwei
开发用于析氢反应（HER）和析氧反应（OER）的高效和地球丰富的双功能催化剂是实现有效的整体水裂解过程所期望的。以金属有机骨架（MOF）衍生的氮掺杂碳纳米片阵列为催化剂载体，制备了一种高活性、高耐久性的珊瑚状磷化镍铁纳米片/碳布（CC-NC-NiFeP）双功能催化剂.结合磷化物对电子结构的调节，并使用三维氮掺杂碳纳米片作为载体，提供大的比表面积以及快速的电荷/质量传输，所制备的CC-NC-在碱性介质中，NiFeP在HER和OER中均具有优异的双功能电催化活性，过电位分别为94 mV和145 mV，达到10 mA的电流密度cm（-2）。同时，CC-NC-NiFeP可以同时作为阴极和阳极用于整体水裂解，实现1.54 V的低电池电压以达到10 mA cm（-2）的电流密度，这优于大多数非贵金属基催化剂。
Development of high-efficiency and Earth-abundant bifunctional catalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is desirable to realize an efficient overall water splitting process. In this work, a highly active and durable bifunctional catalyst of coral-like nickel iron phosphide ultrathin nanosheets anchored on nitrogen-doped carbon nanoflake arrays on carbon cloth (CC-NC-NiFeP) was fabricated by using metal organic framework (MOF) derived nitrogen-doped carbon nanoflake arrays as catalyst supports. Combined with the electronic structure regulation by bimetallic phosphides and using three dimensional nitrogen-doped carbon nanoflakes as supports that provide a large specific surface area as well as fast charge/mass transport, the as-prepared CC-NC-NiFeP yields excellent bifunctional electrocatalytic activity in both the HER and OER in an alkaline medium with an overpotential of 94 mV and 145 mV to reach a current density of 10 mA cm(-2), respectively. Meanwhile, the CC-NC-NiFeP can behave as both a cathode and anode simultaneously for overall water splitting, achieving a low cell voltage of 1.54 V to reach a current density of 10 mA cm(-2), which outperforms that of most of the non-precious metal based catalysts.