Qi Hongyun, Zhang Peng, Wang Haiyan, Cui Yongmei, Liu Xien, She Xilin, Wen Yonghong, Zhan Tianrong
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
School of Environmental Science and Engineering, Collaborative Innovation Center for Marine Biomass Fiber, Materials and Textiles of Shandong Province, Qingdao University, Qingdao 266071, China.
J Colloid Interface Sci. 2021 Oct;599:370-380. doi: 10.1016/j.jcis.2021.04.101. Epub 2021 Apr 21.
It is imperative but challenging to develop non-noble metal-based bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Our work reports a core-shell nanostructure that is constructed by the electrodeposition of ultrathin NiFe-LDH nanosheets (NiFe-LDHNS) on CuSe nanowires, which are obtained by selenizing Cu(OH) nanowires in situ grown on Cu foam. The obtained CuSe@NiFe-LDHNS electrocatalyst provides more exposed edges and catalytic active sites, thus exhibiting excellent OER and HER electrocatalytic performance in alkaline electrolytes. This catalyst needs only an overpotential of 197 mV for OER at 50 mA cm and 195 mV for HER at 10 mA cm. Besides, when employed as a bifunctional catalyst for overall water-splitting, it requires a cell voltage of 1.67 V to reach 10 mA cm in alkaline media. Furthermore, the corresponding water electrolyzer demonstrates robust durability for at least 40 h. The excellent performance of CuSe@NiFe-LDHNS might be ascribed to the synergistic effect from the ultrathin NiFe-LDHNS, the CuSe nanowires anchored on the Cu foam, and the formed core-shell nanostructure, which offers large surface area, ample active sites, and sufficient channels for gas and electrolyte diffusion. This work provides an efficient strategy for the fabrication of self-supported electrocatalysts for efficient overall water-splitting.
开发用于析氧反应（OER）和析氢反应（HER）的非贵金属基双功能电催化剂势在必行，但具有挑战性。我们的工作报道了一种核壳纳米结构，它是通过在CuSe纳米线上电沉积超薄NiFe-LDH纳米片（NiFe-LDHNS）构建而成，CuSe纳米线是通过原位硒化生长在泡沫铜上的Cu(OH)纳米线获得的。所制备的CuSe@NiFe-LDHNS电催化剂提供了更多暴露的边缘和催化活性位点，因此在碱性电解质中表现出优异的OER和HER电催化性能。这种催化剂在50 mA cm下进行OER时仅需197 mV的过电位，在10 mA cm下进行HER时仅需195 mV的过电位。此外，当用作全水解的双功能催化剂时，在碱性介质中达到10 mA cm需要1.67 V的电池电压。此外，相应的水电解槽显示出至少40小时的稳健耐久性。CuSe@NiFe-LDHNS的优异性能可能归因于超薄NiFe-LDHNS、锚定在泡沫铜上的CuSe纳米线以及形成的核壳纳米结构的协同效应，该结构提供了大表面积、充足的活性位点以及用于气体和电解质扩散的足够通道。这项工作为制备用于高效全水解的自支撑电催化剂提供了一种有效策略。
