过电位
材料科学
电池(电)
纳米技术
电催化剂
纳米颗粒
化学工程
分解水
阴极
制氢
氢
析氧
电极
电化学
纳米结构
储能
催化作用
有机化学
化学
功率(物理)
物理化学
工程类
物理
光催化
量子力学
作者
Yapeng Li,Yi Liu,Qizhu Qian,Gongrui Wang,Genqiang Zhang
标识
DOI:10.1016/j.ensm.2020.02.022
摘要
The renewable energy utilization largely relies on the development of highly efficient energy conversion devices including metal-air batteries and water electrolyzers. Currently, it is crucial yet challenging to explore multifunctional nonprecious electrocatalysts with high activity toward oxygen and hydrogen electrodes. Herein, unique donut-shaped hybrid nanostructure composed of interconnected CoP nanoparticles within P, N co-doped carbon matrix (denoted as [email protected]) was successfully fabricated through a supramolecular assisted one-pot strategy. Thanks to the unique morphology and modulated composition, the [email protected] manifested excellent universal electrocatalytic activity for both oxygen and hydrogen electrodes, where a small potential gap of 0.781 V (ΔE = Ej10-E1/2) between ORR and OER and a low overpotential of 173 and 160 mV to reach the current density of 10 mA cm−2 in 1 M KOH and 0.5 M H2SO4 for HER can be achieved. The [email protected] based Zn-air battery could provide an impressive peak power density of 138.57 mW cm−2, and more importantly, a prominent charge/discharge stability after 150 h/350 cycles under a current density of 30 mA cm−2, demonstrating its feasibility as cathode electrocatalyst for rechargeable Zn-air batteries. More importantly, a proof-of-concept system integrating Zn-air battery powered water splitting was further built to achieve cost-effective H2 production.
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