Song Junnan, Chen Ying, Huang Hongjiao, Wang Jiajun, Huang Shao-Chu, Liao Yen-Fa, Fetohi Amani E, Hu Feng, Chen Han-Yi, Li Linlin, Han Xiaopeng, El-Khatib K M, Peng Shengjie
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Material Science and Engineering, Tianjin University, Tianjin, 300072, China.
Adv Sci (Weinh). 2022 Feb;9(6):e2104522. doi: 10.1002/advs.202104522. Epub 2022 Jan 12.
Engineering of structure and composition is essential but still challenging for electrocatalytic activity modulation. Herein, hybrid nanostructured arrays (HNA) with branched and aligned structures constructed by cobalt selenide (CoSe ) nanotube arrays vertically oriented on carbon cloth with CoNi layered double hydroxide (CoSe @CoNi LDH HNA) are synthesized by a hydrothermal-selenization-hybridization strategy. The branched and hollow structure, as well as the heterointerface between CoSe and CoNi LDH guarantee structural stability and sufficient exposure of the surface active sites. More importantly, the strong interaction at the interface can effectively modulate the electronic structure of hybrids through the charge transfer and then improves the reaction kinetics. The resulting branched CoSe @CoNi LDH HNA as trifunctional catalyst exhibits enhanced electrocatalytic performance toward oxygen evolution/reduction and hydrogen evolution reaction. Consequently, the branched CoSe @CoNi LDH HNA exhibits low overpotential of 1.58 V at 10 mA cm for water splitting and superior cycling stability (70 h) for rechargeable flexible Zn-air battery. Theoretical calculations reveal that the construction of heterostructure can effectively lower the reaction barrier as well as improve electrical conductivity, consequently favoring the enhanced electrochemical performance. This work concerning engineering heterostructure and topography-performance relationship can provide new guidance for the development of multifunctional electrocatalysts.
结构和组成的工程设计对于电催化活性的调节至关重要，但仍具有挑战性。在此，通过水热硒化-杂交策略合成了具有分支和排列结构的混合纳米结构阵列（HNA），该阵列由垂直取向于碳布上的硒化钴（CoSe）纳米管阵列与钴镍层状双氢氧化物构建而成（CoSe@CoNi LDH HNA）。分支和中空结构以及CoSe与CoNi LDH之间的异质界面保证了结构稳定性和表面活性位点的充分暴露。更重要的是，界面处的强相互作用可以通过电荷转移有效地调节杂化物的电子结构，进而改善反应动力学。所得的分支状CoSe@CoNi LDH HNA作为三功能催化剂对析氧/还原和析氢反应表现出增强的电催化性能。因此，分支状CoSe@CoNi LDH HNA在10 mA cm下进行水分解时具有1.58 V的低过电位，并且对于可充电柔性锌空气电池具有优异的循环稳定性（70小时）。理论计算表明，异质结构的构建可以有效地降低反应势垒并提高电导率，从而有利于增强的电化学性能。这项关于工程异质结构和形貌-性能关系的工作可以为多功能电催化剂的开发提供新的指导。
