Zhang Xupeng, Wang Jiabo, Bi Yiyang, Wang Ying, Liu Qun, Zhang Yu, Chen Li
School of Petrochemical Technology, Jilin Institute of Chemical Technology, Jilin 132022, P. R. China.
Engineering Research Center of Jilin Provincial Higher Education University of Chemical Separation Technology, School of Petrochemical Technology, Jilin Institute of Chemical Technology, Jilin 132022, P. R. China.
Langmuir. 2024 Mar 12;40(10):5518-5526. doi: 10.1021/acs.langmuir.4c00078. Epub 2024 Feb 28.
Hydrogen (H) stands as a clean energy alternative to fossil fuels, especially within the domain of the hydrogen evolution reaction (HER), offering prospective solutions to mitigate both environmental and energy-related challenges. In this work, we successfully synthesized a sea-urchin-like catalyst, specifically a nickel-cobalt phosphide nanoneedle array on N-doped carbon nanospheres (NiCoP@NCSs), for efficient HER by a sequential hydrothermal and low-temperature phosphating process. The catalyst exhibits sea-urchin-like structures, offering a specific surface area of 298 m g and consequently furnishing a greater abundance of active sites. Comparing with non-sea-urchin-like NiCoP@CN catalysts, the NiCoP@NCSs exhibit an overpotential of 163 mV at 10 mA cm, a Tafel slope of 60 mV dec, and a maintained current density of approximately 90% during 50 h of continuous electrolysis. Experiments demonstrate that the outstanding electrochemical properties of the NiCoP@NCSs originate from nitrogen doping of carbon spheres, the distinctive morphology of sea-urchin-like nanoneedle arrays, and simultaneous enhancements in intermediate adsorption energy, charge transfer, and electrolyte diffusion channel shortening. This work emphasizes a preparation strategy for synthesizing an attractive electrocatalyst with a low cost and efficient HER performance.
氢（H）作为化石燃料的清洁能源替代品，特别是在析氢反应（HER）领域，为缓解环境和能源相关挑战提供了潜在的解决方案。在这项工作中，我们通过连续水热和低温磷化工艺成功合成了一种海胆状催化剂，即N掺杂碳纳米球上的磷化镍钴纳米针阵列（NiCoP@NCSs），用于高效析氢反应。该催化剂呈现出海胆状结构，比表面积为298 m²/g，因此提供了更丰富的活性位点。与非海胆状的NiCoP@CN催化剂相比，NiCoP@NCSs在10 mA/cm²时的过电位为163 mV，塔菲尔斜率为60 mV/dec，并且在连续电解50小时期间保持约90%的电流密度。实验表明，NiCoP@NCSs出色的电化学性能源于碳球的氮掺杂、海胆状纳米针阵列的独特形态以及中间吸附能、电荷转移和电解质扩散通道缩短的同时增强。这项工作强调了一种合成具有低成本和高效析氢性能的有吸引力的电催化剂的制备策略。
