SCHEDULED MAINTENANCE
Heteroatom-doped carbon sheets as metal-free electrocatalysts for promoting the oxygen reduction reaction in Zn–air batteries†
Fengjiao
Yu 
*a
and
Yang
Yang
*a
*a
and
Yang
Yang
*a
Abstract
Zn–air batteries are promising energy devices for future sustainable development. It is crucial to promote the cathodic reaction, oxygen reduction reaction (ORR), by applying active electrocatalysts. Herein, a metal-free ORR electrocatalyst has been fabricated by doping S and N atoms into carbon sheets (S–N–C), and it displays high ORR activity and outstanding performance in Zn–air batteries. The S–N–C electrocatalyst exhibits remarkable ORR activity with a half-wave potential of 0.89 V, which is far exceeding that of the commercial Pt/C benchmark and most reported carbon-based electrocatalysts. A full-cell Zn–air battery device with S–N–C as a cathode catalyst is demonstrated, which delivers high power density and good durability.
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