Liu Xingyu, Wang Mengdi, Umar Ahmad, Wu Xiang
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China.
Promising Centre for Sensors and Electronic Devices (PCSED), Department of Chemistry, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia.
Dalton Trans. 2023 Aug 1;52(30):10457-10464. doi: 10.1039/d3dt01732j.
It is very important to design bi-functional materials for sustainable energy storage and conversion. NiO electrodes are promising candidates for supercapacitors and electrocatalysts, but the poor cycling stability limits their practical applications. To solve this issue, we prepared core-shell structured NiO@CoSe samples by a multi-step hydrothermal protocol. They exhibit a specific capacitance of 1130 C g at a current density of 1 A g. An asymmetric device was assembled using the obtained product as the cathode. It delivers an energy density of 103.8 W h kg at 2700 W kg. As an electrocatalyst for hydrogen evolution reactions, the NiO@CoSe sample presents an overpotential of 82.8 mV@10 mA cm and a Tafel slope of 72.14 mV dec, respectively.
设计用于可持续能量存储和转换的双功能材料非常重要。氧化镍电极是超级电容器和电催化剂的有前途的候选材料，但循环稳定性差限制了它们的实际应用。为了解决这个问题，我们通过多步水热法制备了核壳结构的NiO@CoSe样品。它们在1 A g的电流密度下表现出1130 C g的比电容。使用所得产物作为阴极组装了一个不对称装置。它在2700 W kg时的能量密度为103.8 W h kg。作为析氢反应的电催化剂，NiO@CoSe样品的过电位分别为82.8 mV@10 mA cm和塔菲尔斜率为72.14 mV dec。
