Hollow Co<sub>3</sub> O<sub>4</sub> Nanosphere Embedded in Carbon Arrays for Stable and Flexible Solid-State Zinc-Air Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 29024075.
- Also identified by DOI 10.1002/adma.201704117.
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Abstract
Highly active and durable air cathodes to catalyze both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are urgently required for rechargeable metal-air batteries. In this work, an efficient bifunctional oxygen catalyst comprising hollow Co<sub>3</sub> O<sub>4</sub> nanospheres embedded in nitrogen-doped carbon nanowall arrays on flexible carbon cloth (NC-Co<sub>3</sub> O<sub>4</sub> /CC) is reported. The hierarchical structure is facilely derived from a metal-organic framework precursor. A carbon onion coating constrains the Kirkendall effect to promote the conversion of the Co nanoparticles into irregular hollow oxide nanospheres with a fine scale nanograin structure, which enables promising catalytic properties toward both OER and ORR. The integrated NC-Co<sub>3</sub> O<sub>4</sub> /CC can be used as an additive-free air cathode for flexible all-solid-state zinc-air batteries, which present high open circuit potential (1.44 V), high capacity (387.2 mAh g<sup>-1</sup> , based on the total mass of Zn and catalysts), excellent cycling stability and mechanical flexibility, significantly outperforming Pt- and Ir-based zinc-air batteries.