Rechargeable metal-air batteries are considered as one of the most promising energy storage and conversion devices due to their ultrahigh energy density.Slow kinetics of cathodic electrochemical oxygen reduction/evolution reactions is a key factor affecting the performance of metal-air batteries, which requires a bi-functional catalyst to facilely realize the charge and discharge processes of a metal-air battery.In this review, we discuss the novel bi-functional catalysts developed in recent years, including precious metals, carbon materials, transition metal oxides, and hybrid materials.Among them, transition metal oxideanocarbon strong coupled hybrid materials have been developed as a new gene-ration of oxygen catalytic material with promising catalytic activity.Finally, several possible research directions in future are proposed based on the existing problem.%可充电金属-空气电池因具有超高的能量密度被认为是最有发展前景的能源存储与转换装置之一.阴极电化学氧还原/生成反应缓慢动力学是影响金属-空气电池性能的关键因素,因此其充放电过程需要双功能催化剂进行催化.在此我们详细论述了近年来开发的新型双功能催化剂,包括贵金属、碳材料、过渡金属氧化物和复合材料.其中,强耦合过渡金属氧化物/纳米碳复合物成为新一代具有高催化活性的氧催化材料.最后,基于目前所存在的问题提出了几个未来可能的研究方向.
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