Wang Xiaohan, Tian Han, Zhu Libo, Li Shujing, Cui Xiangzhi
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.
Nanomaterials (Basel). 2024 May 14;14(10):853. doi: 10.3390/nano14100853.
The application of electrochemical hydrogen evolution reaction (HER) for renewable energy conversion contributes to the ultimate goal of a zero-carbon emission society. Metal phosphides have been considered as promising HER catalysts in the alkaline environment, which, unfortunately, is still limited owing to the weak adsorption of H* and easy dissolution during operation. Herein, a bimetallic NiCoP-2/NF phosphide is constructed on nickel foam (NF), requiring rather low overpotentials of 150 mV and 169 mV to meet the current densities of 500 and 1000 mA cm, respectively, and able to operate stably for 100 h without detectable activity decay. The excellent HER performance is obtained thanks to the synergetic catalytic effect between Ni and Co, among which Ni is introduced to enhance the intrinsic activity and Co increases the electrochemically active area. Meanwhile, the protection of the externally generated amorphous phosphorus oxide layer improves the stability of NiCoP/NF. An electrolyser using NiCoP-2/NF as both cathode and anode catalysts in an alkaline solution can produce hydrogen with low electric consumption (overpotential of 270 mV at 500 mA cm).
将电化学析氢反应（HER）应用于可再生能源转换有助于实现零碳排放社会的最终目标。金属磷化物在碱性环境中被认为是有前景的HER催化剂，然而，由于H*的弱吸附以及运行过程中的易溶解，其性能仍受到限制。在此，一种双金属NiCoP-2/NF磷化物被构建在泡沫镍（NF）上，分别达到500和1000 mA cm的电流密度时，所需的过电位相当低，分别为150 mV和169 mV，并且能够稳定运行100小时而没有可检测到的活性衰减。由于Ni和Co之间的协同催化作用，获得了优异的HER性能，其中引入Ni以增强本征活性，Co增加了电化学活性面积。同时，外部生成的非晶态磷氧化物层的保护提高了NiCoP/NF的稳定性。在碱性溶液中使用NiCoP-2/NF作为阴极和阳极催化剂的电解槽可以以低电耗产生氢气（在500 mA cm时过电位为270 mV）。
