Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery.

ABSTRACT: Recent fruitful studies on rechargeable zinc-air battery have led to emergence of various bifunctional oxygen electrocatalysts, especially metal-based materials. However, their electrocatalytic configuration and evolution pathway during battery operation are rarely spotlighted. Herein, to depict the underlying behaviors, a concept named dynamic electrocatalyst is proposed. By selecting a bimetal nitride as representation, a current-driven "shell-bulk" configuration is visualized via time-resolved X-ray and electron spectroscopy analyses. A dynamic picture sketching the generation and maturation of nanoscale oxyhydroxide shell is presented, and periodic valence swings of performance-dominant element are observed. Upon maturation, zinc-air battery experiences a near two-fold enlargement in p

SUBMITTER: Deng YP 

PROVIDER: S-EPMC7181633 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature