Porous CoP nanosheets converted from layered double hydroxides with superior electrochemical activity for hydrogen evolution reactions at wide pH ranges
Porous CoP nanosheets converted from layered double hydroxides with superior electrochemical activity for hydrogen evolution reactions at wide pH ranges
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由层状双氢氧化物转化而来的多孔 CoP 纳米片，具有优异的电化学活性，可在宽 pH 范围内进行析氢反应
DOI：
10.1039/c7cc08838h
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发表时间：
2018
影响因子：
4.9
通讯作者：
Wang Shuangyin
中科院分区：
文献类型：
--
作者：
Zeng Yifan;Wang Yanyong;Huang Gen;Chen Chen;Huang Liangliang;Chen Ru;Wang Shuangyin
多孔材料由于具有高表面积和丰富的边缘位置，在许多应用中得到了广泛的研究。本文首次报道了一种简单方便的方法，即在碳纸上选择性刻蚀煤层双氢氧化物中的两性Al (CoAl- ldh /CP)，然后在碳纸上通过低温磷化将其转化为多孔磷化钴纳米片（p-CoP/CP）。与碳纸上的原始磷化钴纳米片（CoP/CP）相比，p-CoP/CP具有更低的过电位、塔菲尔斜率和电荷转移电阻，以及更高的电化学活性表面积。优异的电化学特性使其在整个pH范围内都具有优异的催化活性和稳定性。在1.0 M KOH下，p-CoP/CP只需要57 mV的过电位来驱动10 mA cm−2。要达到相同的电流密度，只需要在1.0 M H2SO4和1.0 M PBS中分别有39和60 mV的过电位。据我们所知，在中性溶液中用于析氢的非贵重电催化剂中，它是最好的。此外，这种催化剂在整个pH范围内都具有良好的耐久性。
Porous materials are widely studied in many applications due to their high surface area and rich edge sites. Here, for the first time, we reported a simple and convenient method to synthesize porous nanosheets of metal hydroxides by selectively etching amphoteric Al in CoAl layered double hydroxides on carbon paper (CoAl-LDH/CP), and then convert them into porous cobalt phosphide nanosheets on carbon paper (p-CoP/CP) via low temperature phosphidation. In contrast to pristine cobalt phosphide nanosheets on carbon paper (CoP/CP), p-CoP/CP has lower overpotential, Tafel slope and charge transfer resistance as well as higher electrochemically active surface area. The excellent electrochemical characteristics make it have outstanding catalytic activity and stability over the whole pH range. In 1.0 M KOH, the p-CoP/CP only requires an overpotential of 57 mV to drive 10 mA cm−2. To achieve the same current density, it only needs overpotentials of 39 and 60 mV in 1.0 M H2SO4 and 1.0 M PBS, respectively. To our knowledge, it is the best among those nonprecious electrocatalysts used for hydrogen evolution in neutral solution. Moreover, this catalyst offers good durability over the whole pH range.