Chen Linli, Zhao Wenna, Chen Hao, Tao Kai, Li Guochang, Han Lei
School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China.
School of Biological and Chemical Engineering, Ningbotech University, Ningbo, Zhejiang 315100, China.
Inorg Chem. 2023 Sep 4;62(35):14300-14309. doi: 10.1021/acs.inorgchem.3c01692. Epub 2023 Aug 18.
The design and development of high-performance electrochemical electrode materials are crucial for energy storage and conversion systems. This work reports a facile preparation of a self-supported Zn/Co-S@Ni(OH) array electrode in which a Zn/Co-S nanosheet is derived from a leaf-like zeolitic imidazolate framework (Zn/Co-ZIF-L). The core-shell structure provides multiple benefits such as enhanced electrical conductivity, an abundance of exposed active sites, and strong electronic interactions between Zn/Co-S and ultra-thin Ni(OH) nanosheets, facilitating faster charge transfer. Consequently, Zn/Co-S@Ni(OH) demonstrates remarkable electrochemical characteristics as an electrode material for supercapacitors with an area capacitance of 12.9 F cm at a current density of 2 mA cm in 2 M KOH. The assembled asymmetric supercapacitor device achieves a high energy density of 0.95 mW h cm, while showing excellent longevity with a retention of 90.9% over 5000 cycles. Additionally, the Zn/Co-S@Ni(OH) arrays demonstrate significant oxygen evolution reaction activity with an overpotential of 242 mV at 10 mA cm in 1 M KOH and significant stability for more than 100 h. This work provides a valuable approach for synthesizing bifunctional electrode materials for both energy storage and electrocatalysis applications.
高性能电化学电极材料的设计与开发对于能量存储和转换系统至关重要。这项工作报道了一种自支撑Zn/Co-S@Ni(OH)阵列电极的简便制备方法，其中Zn/Co-S纳米片源自叶状沸石咪唑框架（Zn/Co-ZIF-L）。核壳结构具有多种优势，如增强的电导率、大量暴露的活性位点以及Zn/Co-S与超薄Ni(OH)纳米片之间的强电子相互作用，有助于更快的电荷转移。因此，Zn/Co-S@Ni(OH)作为超级电容器的电极材料表现出卓越的电化学特性，在2 M KOH中，电流密度为2 mA cm时面积电容为12.9 F cm。组装的不对称超级电容器器件实现了0.95 mW h cm的高能量密度，同时具有出色的寿命，在5000次循环中保持率为90.9%。此外，Zn/Co-S@Ni(OH)阵列在1 M KOH中，电流密度为10 mA cm时，析氧反应过电位为242 mV，表现出显著的析氧反应活性，并且在100 h以上具有显著的稳定性。这项工作为合成用于能量存储和电催化应用的双功能电极材料提供了一种有价值的方法。
