在碳化木材上生长的具有针状纳米结构的石墨烯量子点诱导的 MnO2 作为超级电容器的高级电极,Carbon

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在碳化木材上生长的具有针状纳米结构的石墨烯量子点诱导的 MnO2 作为超级电容器的高级电极
Carbon ( IF 10.5 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.carbon.2020.02.039
Weiye Zhang , Yingni Yang , Rongqi Xia , Yanchen Li , Junqi Zhao , Lin Lin , Jiaming Cao , Qihang Wang , Yi Liu , Hongwu Guo

摘要水热和电化学沉积方法已被用于制造用作独立式超级电容器电极的多孔木炭 (PWC)/伪电容混合材料。然而，由于赝电容材料固有的存储机制，其循环稳定性较差，其比电容需要进一步提高。在这项研究中，通过热解天然轻木直接生产 PWC 作为导电基质，然后沉积二氧化锰 (MnO2) 和石墨烯量子点 (GQDs)，通过水热法制造 PWC/MnO2/GQDs 电极。GQDs 显着促进离子传输，并保护 MnO2 不会从 PWC 的外表面和内部脱落。与 PWC/MnO2 电极相比，通过添加 GQD 形成的独特针状纳米结构为超级电容器电极带来了更好的电化学性能，包括中等面积比电容（2712 mF cm-2，电流密度为 1.0 mA cm-2）、良好的倍率性能和出色的循环稳定性（2000 次循环后保留率达 95.3%）。这表明GQDs修饰的复合材料将促进高性能储能器件的发展。

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Graphene-quantum-dots-induced MnO2 with needle-like nanostructure grown on carbonized wood as advanced electrode for supercapacitors

Abstract Hydrothermal and electrochemical deposition methods have been employed to fabricate porous wood carbon (PWC)/pseudocapacitive hybrid materials for use as free-standing supercapacitor electrodes. However, their cycling stability is poor because of the inherent storage mechanism of pseudocapacitive materials, and their specific capacitance requires further improvement. In this study, PWC was directly produced as a conductive matrix by pyrolyzing natural balsa wood, and then manganese dioxide (MnO2) and graphene quantum dots (GQDs) were deposited to fabricate a PWC/MnO2/GQDs electrode by a hydrothermal method. GQDs significantly boosts the ions transport, and protects MnO2 from falling off both the external surface and inside the channel of PWC. Compared with a PWC/MnO2 electrode, the unique needle-like nanostructures formed by adding GQDs resulted in a better electrochemical performance for a supercapacitor electrode, including a moderate areal specific capacitance (2712 mF cm−2 at a current density of 1.0 mA cm−2), good rate capability, and excellent cycling stability (95.3% retention after 2000 cycles). This indicated that GQDs-decorated composites will promote the development of high-performance energy storage devices.

更新日期：2020-06-01

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