Recent Advances on the Modulation of Electrocatalysts Based on Transition Metal Nitrides for the Rechargeable Zn-Air Battery

For its high energy density, economy, and safety, the Zn-air battery (ZAB) is regarded as one of the most promising sustainable energy devices. Transition metal nitrides (TMNs) have the advantages of low cost, high electrical conductivity, corrosion resistance, and bifunctional ORR (oxygen reduction reaction)/OER (oxygen evolution reaction) catalytic activity, which are highly desired properties for the rechargeable ZAB. The application of TMNs as electrocatalysts for rechargeable ZAB will be reviewed in this paper. Special emphasis will be put on the regulation of TMNs, which can be realized at atomic, micro, and electronic levels. The regulation of the electrical conductivity, intrinsic catalytic activity, and reaction surface area can enhance the efficiency of rechargeable ZAB. The relationship of the regulation and the promoted performance of rechargeable ZAB will be highlighted. By summarizing recent progress of nanostructured transition metal nitrides for the rechargeable ZAB, this review will give an understanding of the TMN-based electrocatalytic mechanism, promote the development of the advanced electrocatalysts, and inspire the design of highly stable and efficient ZAB.