化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (7) : 169-173.

科学研究

共沉淀法制备ZnMn₂O₄/Ag/RGO复合物及其电化学性能研究

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Electrochemical performance of ZnMn₂O₄/Ag/RGO synthesized by coprecipitation

Yu Maosheng, Yu Hongjun, Zhang Yuhuan, Chen Junqing, Bei Fengli

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Received		Published
2018-03-13		2019-07-20
Issue Date	Revised Date
2019-08-05	2018-03-13

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摘要

采用共沉淀法和高温煅烧结合的方式,制备出介孔棒状结构的锰酸锌(ZnMn₂O₄,简写为ZMO),其首次放电比容量为1423mAh/g。为进一步优化ZMO的电化学性能,通过改进传统方法制备了纳米银粒子,通过 Hummers法制备氧化石墨烯(GO),再利用盐平衡法,合成了Ag/GO复合物。基于共沉淀法,高温下GO被还原成还原氧化石墨烯(RGO),进而形成ZMO/Ag、ZMO/Ag/RGO复合物。纳米银粒子的添加提高了ZMO的电导率,改善了其倍率性能。GO的添加提高了ZMO的比容量且循环性能、倍率性能都有了不同程度的改善。Ag/GO复合物的添加,进一步提高了ZMO的比容量和电导率。ZMO/Ag/RGO复合物首次放电比容量高达1637mAh/g,在电流密度1000mA/g条件下,其平均放电比容量高达710mAh/g。

Abstract

ZnMn₂O₄ (ZMO) with mesoporous rod-like structure was synthesized by coprecipitation method combined with high-temperature calcination.The initial discharge specific capacity was 1423mAh/g.In order to further optimize,nanosilver sol was synthesized by improved traditional method,graphene oxide (GO) was synthesized by hummers method and then Ag/GO composite was synthesized by salt balance method.Based on the coprecipitation method,graphene oxide was reduced to reduced graphene oxide (RGO) at a high temperature to form ZMO/Ag,ZMO/Ag/RGO composites.The addition of nanosilver particles enhanced the conductivity of ZnMn₂O₄ and improved the rate performance.The addition of GO improved the specific capacity,the cycle and rate performance in various degrees.The addition of the Ag/GO further increased the specific capacity and the conductivity.The first discharge capacity of ZMO/Ag/RGO was as high as 1637mAh/g,and the average discharge capacity was up to 710mAh/g at the large current of 1000mA/g.

关键词

共沉淀法 / 锰酸锌 / 复合物 / 电化学

Key words

coprecipitation method / zinc manganate / composite / electrochemistry

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共沉淀法制备ZnMn₂O₄/Ag/RGO复合物及其电化学性能研究[J]. 化工新型材料, 2019, 47(7): 169-173 DOI:

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