过电位
催化作用
双功能
石墨烯
钴
电解质
海水
材料科学
氯化物
析氧
阴极
化学工程
无机化学
化学
纳米技术
电化学
电极
物理化学
有机化学
冶金
海洋学
地质学
工程类
作者
Seong‐Hee Kim,Seulgi Ji,Hyunsoo Yang,Hyunji Son,Heechae Choi,Jun Kang,Oi L. Li
标识
DOI:10.1016/j.apcatb.2022.121361
摘要
Rechargeable seawater batteries (SWBs) are recently considered as a new approach in next-generation energy storage. However, the presence of chloride ions inhibits the performance and durability of the air cathode electrocatalysts. This study is the first research to report the effect of the built-in electric field on corrosion prevention via Cl- repulsion. Our DFT model successfully demonstrated the near-surface charge transfer at the interface of cobalt core and pyridinic-N graphene (Co (fcc)/N-Gr) strongly contributed to advanced catalytic activity and selectively Cl- repulsion in seawater electrolyte. Experimentally, the structure of a few layered N-doped graphene encapsulated cobalt (Co 4 mmol-N/C) showed superior catalytic activity in both alkaline (ΔE (Ej=10 − E1/2) = 0.774 V) and seawater (ΔE = 1.167 V). Furthermore, Co 4 mmol-N/C demonstrated an extremely low overpotential (0.56 V) at 0.1 mA and presented superior stability for 100 h in a rechargeable SWB.
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