Lu Yuchen, Huang Bingji, Yuan Jingjing, Qiao Yifan, Zhang Wenyao, He Guangyu, Chen Haiqun
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Centre, Changzhou University, Changzhou, Jiangsu Province 213164, China.
Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing, 210094, China.
Dalton Trans. 2022 Nov 29;51(46):17820-17826. doi: 10.1039/d2dt02755k.
The electrochemical performance of hybrid capacitors is seriously affected by the slow charging and discharging of the bulk phase. Here, Co-doped amorphous NiMoS modified with reduced graphene oxide (rGO) was prepared by a simple one-step hydrothermal method, and the obtained Co-doped NiMoS/rGO nanocomposite (NiCoMoS/rGO) exhibits a high specific surface area, realizing the redox reaction from the bulk to the surface. Owing to the doping of Co with abundant redox active sites and the support of rGO sheets with high conductivity and a stable structure, the NiCoMoS/rGO anode assembled with an oxidized needle coke (NCO) cathode shows an excellent energy density of 28.9 W h kg at a power density of 968.3 W kg. In addition, the hybrid supercapacitor displays a superior cycling performance with a capacity retention of 92.4% after 10 000 cycles. The construction of the Co-doped NiMoS/rGO nanocomposite provides an effective strategy to boost the activity and stability of amorphous NiMoS for high-performance hybrid supercapacitors.
混合电容器的电化学性能受到体相缓慢充放电的严重影响。在此，通过简单的一步水热法制备了用还原氧化石墨烯（rGO）改性的共掺杂非晶态NiMoS，所得的共掺杂NiMoS/rGO纳米复合材料（NiCoMoS/rGO）具有高比表面积，实现了从体相到表面的氧化还原反应。由于具有丰富氧化还原活性位点的Co的掺杂以及具有高导电性和稳定结构的rGO片的支撑，与氧化针状焦（NCO）阴极组装的NiCoMoS/rGO阳极在功率密度为968.3 W kg时显示出28.9 W h kg的优异能量密度。此外，该混合超级电容器表现出优异的循环性能，在10000次循环后容量保持率为92.4%。共掺杂NiMoS/rGO纳米复合材料的构建为提高非晶态NiMoS用于高性能混合超级电容器的活性和稳定性提供了一种有效策略。
