Wang Xinqiang, Chen Yuanfu, Yu Bo, Wang Zegao, Wang Haiqi, Sun Baochen, Li Wenxin, Yang Dongxu, Zhang Wanli
School of Electronic Science and Engineering, and State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China.
College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Small. 2019 Sep;15(37):e1902613. doi: 10.1002/smll.201902613. Epub 2019 Jul 30.
It is still challenging to develop high-efficiency and low-cost non-noble metal-based electrocatalysts for hydrogen evolution reaction (HER) in pH-universal electrolytes. Herein, hierarchically porous W-doped CoP nanoflake arrays on carbon cloth (W-CoP NAs/CC) are synthesized via facile liquid-phase reactions and a subsequent phosphorization process. The W-CoP NAs/CC hybrid can be directly employed as a binder-free electrocatalyst and delivers superior HER performance in pH-universal electrolytes. Especially, it delivers very low overpotentials of 89, 94, and 102 mV to reach a current density of 10 mA cm in acidic, alkaline, and neutral electrolytes, respectively. Furthermore, it shows a nearly 100% Faradaic efficiency as well as superior long-term stability with no decreasing up to 36 h in pH-universal electrolytes. The outstanding electrocatalytic performance of W-CoP NAs/CC can be mainly attributed to the porous W-doped nanoflake arrays, which not only afford rich exposed active sites, but also accelerate the access of electrolytes and the diffusion of H bubbles, thus efficiently promoting the HER performance. This work provides a new horizon to rationally design and synthesize highly effective and stable non-noble metal phosphide-based pH-universal electrocatalysts for HER.
在pH通用电解质中开发用于析氢反应（HER）的高效低成本非贵金属基电催化剂仍然具有挑战性。在此，通过简便的液相反应和随后的磷化过程，在碳布上合成了分级多孔W掺杂的CoP纳米片阵列（W-CoP NAs/CC）。W-CoP NAs/CC杂化物可直接用作无粘结剂电催化剂，并在pH通用电解质中表现出优异的HER性能。特别是，在酸性、碱性和中性电解质中，分别只需89、94和102 mV的超低过电位就能达到10 mA cm的电流密度。此外，它在pH通用电解质中显示出近100%的法拉第效率以及优异的长期稳定性，长达36小时性能无下降。W-CoP NAs/CC出色的电催化性能主要归因于多孔W掺杂的纳米片阵列，它不仅提供了丰富的暴露活性位点，还加速了电解质的 access和H气泡的扩散，从而有效地促进了HER性能。这项工作为合理设计和合成用于HER的高效稳定的非贵金属磷化物基pH通用电催化剂提供了新的视野。
