双功能
材料科学
析氧
碳纳米管
电催化剂
纳米颗粒
化学工程
氧气
纳米技术
催化作用
电极
化学
电化学
物理化学
有机化学
工程类
作者
Ailing Feng,Liang Liu,Peitao Liu,Yanqing Zu,Fengbo Han,Xiaodong Li,Shijiu Ding,Yanan Chen
出处
期刊:Research Square - Research Square
日期:2022-12-29
标识
DOI:10.21203/rs.3.rs-2343151/v1
摘要
Abstract Designing interfacial structure is an essential but challenging approach to regulating electronic structures to develop favorable bifunctional oxygen electrocatalysts in Zn-air batteries (ZABs). We utilize a facile one-step sintering strategy for preparing Co 2 P/Co 3 Fe 7 interfacial nanoparticles encapsulated in N-doped carbon nanotubes (Co 2 P/Co 3 Fe 7 @N-C). The obtained Co 2 P/Co 3 Fe 7 @N-C electrocatalyst exhibits significant bifunctional oxygen evolution/reduction reaction (OER/ORR) activity (Δ E = 0.61 V), better than that of Pt/C + Ir/C (Δ E = 0.69 V) and compete with other previously report electrocatalysts. The density functional theory results reveal that the synergistic coupling effect and interfacial electronic interaction between Co 2 P and Co 3 Fe 7 play a key role in boosting bifunctional ORR/OER efficiency. Remarkably, Co 2 P/Co 3 Fe 7 @N-C-based liquid ZABs exhibit excellent performance with higher power density (152.3 mW cm − 2 ) and longer cycle stability (1596 cycles) than the Pt/C + Ir/C-based ZABs (105 mW cm − 2 ; 882 cycles). Interestingly, the connected in series of Co 2 P/Co 3 Fe 7 @N-C-based liquid ZABs can be powered emitting diodes (LEDs) and blue LEDs display panel, indicating the possibility of practical application. It can be predicted that our present work opens a new pathway for rationally designing superior bifunctional oxygen electrocatalysts for rechargeable metal-air batteries through interfacial engineering.
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