石墨烯
电催化剂
材料科学
电池(电)
纳米颗粒
催化作用
热解
化学工程
兴奋剂
贵金属
金属
纳米技术
无机化学
电化学
电极
化学
冶金
光电子学
有机化学
功率(物理)
物理化学
工程类
物理
量子力学
作者
Ansheng Wang,Chunning Zhao,Meng Yu,Weichao Wang
标识
DOI:10.1016/j.apcatb.2020.119514
摘要
Rationally designing an efficient and stable multifunctional electrocatalyst to replace the noble metal catalysts is extremely demanding but challenging. Herein, we develop a facile method to synthesis the defective nitrogen-doped graphene encapsulated metal nanoparticles by pyrolysis of graphene-supermolecule complexes. The obtained catalyst exhibits superior activities toward ORR (E1/2 = 0.864 V), OER (η =383 [email protected] mA/cm2) and HER (η = 193 [email protected] mA/cm2) in 0.1 M KOH solution. Equipping the materials into a rechargeable zinc-air battery produces a peak power density of 205 mW/cm2 and a cycle life of 667 h. It is found that formative M–Nx and defective N-doped graphene are the main origins of ORR activity while OER and HER activities are attributed to the defect-rich N-doped C and Co core. This finding provides insights to design electrocatalyst with both multifunctional catalytic activities and high stability.
科研通智能强力驱动
Strongly Powered by AbleSci AI