He Xinkuai, Hu Zhousi, Zou Qingtian, Yang Jingjing, Guo Ruqing, Wu Luye
School of Packaging and Materials Engineering, Hunan University of Technology Zhuzhou 412007 PR China
RSC Adv. 2023 Mar 16;13(13):8901-8914. doi: 10.1039/d2ra08233k. eCollection 2023 Mar 14.
The preparation of active, stable and low-cost non-noble electrocatalysts for the hydrogen evolution reaction (HER) using the electrochemical water splitting process is crucial for the promotion of sustainable energy. In this study, Co-Ni alloys with various Co contents are prepared using a galvanostatic method and the co-deposition behavior of Co and Ni in ethylene glycol (EG) is reported. These results indicate that the presence of additional Ni species can accelerate the Co-Ni co-deposition process and Co species in the system can inhibit the reduction of Ni. Moreover, the two effects are improved with an increase in Ni or Co species concentration in the EG system, respectively. Chronoamperometry records show that the Co-Ni electro-crystallization mechanism is one of 3D instantaneous nucleation and growth. Moreover, the Co-Ni alloy with 59.46 wt% Co exhibits high electrocatalytic activity for HER with an overpotential of 133 mV at 10 mA cm in 1 M KOH due to a high value of electrochemical active surface area (ECSA) (955.0 cm). Therefore, the Co-Ni alloy electrocatalyst obtained from the EG system could be a promising candidate for practical hydrogen production.
利用电化学水分解过程制备用于析氢反应（HER）的活性高、稳定性好且成本低的非贵金属电催化剂对于促进可持续能源发展至关重要。在本研究中，采用恒电流法制备了具有不同钴含量的钴镍合金，并报道了钴和镍在乙二醇（EG）中的共沉积行为。这些结果表明，额外镍物种的存在可以加速钴镍共沉积过程，而体系中的钴物种可以抑制镍的还原。此外，这两种效应分别随着EG体系中镍或钴物种浓度的增加而增强。计时电流法记录表明，钴镍电结晶机理是三维瞬时成核和生长之一。此外，由于电化学活性表面积（ECSA）值较高（955.0 cm²），含钴量为59.46 wt%的钴镍合金在1 M KOH中，在10 mA cm⁻²电流密度下的过电位为133 mV，对析氢反应表现出高电催化活性。因此，从EG体系获得的钴镍合金电催化剂可能是实际制氢的一个有前途的候选材料。
