Defect-Rich, Graphenelike Carbon Sheets Derived from Biomass as Efficient Electrocatalysts for Rechargeable Zinc-Air Batteries
Defect-Rich, Graphenelike Carbon Sheets Derived from Biomass as Efficient Electrocatalysts for Rechargeable Zinc-Air Batteries
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DOI：
10.1021/acssuschemeng.9b07621
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发表时间：
2020-02-24
影响因子：
8.4
通讯作者：
Jiang, Jianchun
中科院分区：
文献类型：
--
作者：
Liu, Yanyan;Sun, Kang;Jiang, Jianchun
可充电锌空气电池（RZAB）因其成本低、环境友好、安全性高和比能量密度高而备受关注。阻碍RZAB大规模应用的瓶颈是用于氧还原反应/析氧反应(ORR/OER)的贵金属(Pt、IrO2和RuO2)电催化剂的高成本和脆弱性。在这项工作中，使用光女贞果实作为原材料，通过无毒、可扩展和可持续的生物质策略，生产出具有 N 掺杂的类石墨烯和富含缺陷的碳片 (GPNCS)，作为 RZAB 的高活性电催化剂。 GPNCS的类石墨烯和多孔结构使该材料具有高电导率和比表面积，这有利于其作为电催化剂的良好性能。 N掺杂原子和拓扑缺陷之间的协同效应赋予GPNCS显着的ORR活性和中等的OER性能。 RZAB验证了GPNCS的优异催化性能，其充放电电压间隙较低，在10 mA.cm(-2)下经过1340次循环（约500小时）后几乎保持不变。这项研究为高效ORR/OER电催化剂的成本效益和大规模生产开辟了一条新途径，以开发下一代能量存储和转换系统。
Rechargeable Zinc-air batteries (RZABs) have attracted much attention due to their low cost, environmental benignity, high safety, and specific energy density. The bottleneck blocking the large-scale application of RZABs is the high cost and vulnerability of noble metal (Pt, IrO2, and RuO2) electrocatalysts for the oxygen reduction reaction/oxygen evolution reaction (ORR/OER). In this work, using the fruits of glossy privet as raw material, graphenelike and defect-rich carbon sheets with N doping (GPNCS) are produced as a highly active electrocatalyst for RZABs via a nontoxic, scalable, and sustainable biomass strategy. The graphenelike and porous structure of GPNCS enables the material to possess high conductivity and specific surface area, which are beneficial for its good performance as an electrocatalyst. The synergistic effect between N-doping atoms and topological defects endows the GPNCS with remarkable ORR activity and moderate OER performance. The RZABs verify the excellent catalytic performance of GPNCS, with a low charge-discharge voltage gap that remains nearly unchanged after 1340 cycles (about 500 h) at 10 mA.cm(-2). This research opens up a new avenue for the cost-effective and large-scale production of highly efficient ORR/OER electrocatalysts for the development of next-generation energy storage and conversion systems.