材料科学
钴
电催化剂
纳米颗粒
过电位
化学工程
碳纤维
碳纳米纤维
析氧
纳米技术
分解水
纳米纤维
电解水
电化学
催化作用
碳化
电解质
电解
电极
碳纳米管
化学
光催化
复合材料
复合数
冶金
生物化学
物理化学
工程类
扫描电子显微镜
作者
Lixin Sun,Haoshan Xu,Yang Yang,Ling Li,Xiaohui Zhao,Wenming Zhang
标识
DOI:10.1016/j.ijhydene.2022.11.058
摘要
Physical mixing of monofunctional noble metal catalysts, such as Pt/C or Ru/IrO2, increases the commercial cost and stability risk of electrodes. Therefore, it is desirable to develop a multifunctional electrocatalyst for zinc-air batteries and integrated electrolytic devices. To develop an effective way to fabricate high-performance multifunctional electrocatalysts by modifying advanced nanostructures, a coaxial electrospinning approach with in-situ synthesis and subsequent carbonization was used to construct a highly integrated three-function catalyst composed of graphitic carbon-encapsulated cobalt nanoparticles embedded into one-dimensional (1D) porous hollow carbon nanofibers (CoNC-HCNFs). Under the synergistic effect of the active material and the advanced nanostructure, the as-prepared CoNC-HCNFs demonstrated an operating overpotential of 186 mV (10 mA cm−2) for the hydrogen evolution reaction (HER), a half-wave potential of 0.83 V (vs. RHE at 10 mA cm−2) for the oxygen reduction reaction (ORR), and a potential of 1.58 V (10 mA cm−2) for the oxygen evolution reaction (OER). With their exceptional multifunctional activities, two CoNC–HCNF-based aqueous zinc-air batteries (ZABs) in series could drive an alkaline water electrolyzer for splitting water. Furthermore, due to the superior mechanical flexibility and rechargeability of the solid-state ZAB, it has great application prospects in powering portable and wearable electronics. This research is expected to offer inspiration for the development of other excellent MOF-based hollow carbon nanofibers and to enable them to be adopted more widely in electrochemical energy conversion and energy storage.
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