Three-dimensional graphene/transition metal alloys from gelatin-based hydrogel for Zinc air battery
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A study on stable and efficient bifunctional oxygen reduction/evolution electrocatalysts is mightily important in rechargeable Zn-air battery. In this work, we develop in-situ grown few-layers graphene-decorated transition metal alloys on nitrogen-doped carbon sheets(3DGM-NC) from anionic gelatin-based hydrogels with cationic transition metal particles for high performance Zn-air battery. This bifunctional catalyst achieves a positive half-wave potential of 0.947 V (vs reversible hydrogen electrode, RHE) for oxygen reduction reaction, and a operating potentials of 1.67 V at a 10 mA/cm2 of oxygen evolution reaction with high stability for 10 hours due to stable graphene structure and synergetic effects of transition metal alloys and nitrogen-containing functional groups. This study suggests new opportunities to develop new design and synthesis for energy conversion or storage industries.