Yang Ting, Dong Aiyi, Liao Weimin, Zhang Xun, Ma Yinhua, Che Li, Gao Honglin
Transportation Engineering College, Dalian Maritime University, Dalian 116026, China.
School of Science, Dalian Maritime University, Dalian 116026, China.
Nanomaterials (Basel). 2025 Aug 8;15(16):1216. doi: 10.3390/nano15161216.
Hydrogen production by the electrolysis of water has become an important way to prepare green hydrogen because of its simple process and high product purity. However, the oxygen evolution reaction (OER) in the electrolysis process has a high overpotential, which leads to the increase of energy consumption. Developing efficient, stable and low-cost electrolytic water catalyst is the core challenge to reduce the reaction energy barrier and improve the energy conversion efficiency. CoS@NiS-80% nanosheets with rich heterogeneous interfaces were successfully synthesized by hydrothermal reaction and sulfuration. Heterogeneous interface not only promotes the effective charge transfer between different materials and reduces the charge transfer resistance but also accelerates the four-electron transfer process through the synergistic effect of nickel and cobalt atoms. Under alkaline conditions, the overpotential of CoS@NiS-80% nanosheets was only 280 mV at a current density of 10 mA cm, with a Tafel slope of 100.87 mV dec. Furthermore, it could work continuously for 100 h, exhibiting its outstanding stability. This work provides a novel approach for improving the OER performance of transition metal sulfide-based electrocatalysts through heterogeneous interface engineering.
通过水电解制氢因其工艺简单、产品纯度高而成为制备绿色氢气的重要途径。然而，电解过程中的析氧反应（OER）具有较高的过电位，这导致了能耗的增加。开发高效、稳定且低成本的电解水催化剂是降低反应能垒、提高能量转换效率的核心挑战。通过水热反应和硫化成功合成了具有丰富异质界面的CoS@NiS-80%纳米片。异质界面不仅促进了不同材料之间的有效电荷转移，降低了电荷转移电阻，还通过镍和钴原子的协同作用加速了四电子转移过程。在碱性条件下，CoS@NiS-80%纳米片在电流密度为10 mA cm时的过电位仅为280 mV，塔菲尔斜率为100.87 mV dec。此外，它可以连续工作100小时，表现出出色的稳定性。这项工作为通过异质界面工程提高过渡金属硫化物基电催化剂的OER性能提供了一种新方法。
