摘要
水系质子电池具有安全、环保、动力学快、成本低等优点,是一种很有前途的电化学储能系统.这些优点的实现依赖于开发合适且易于获取的电极材料.本文研究了微米尺度的H_(2)MoO_(3)/VPANI作为质子电池负极材料的高倍率性能和稳定性.与大多数负极材料的赝电容性质相反,H_(2)MoO_(3)/PANI同时具有的高比容量和高倍率性能是基于扩散控制的电荷存储机制.H_(2)MoO_(3)/PANI电极在1.0 A g^(-1)时具有268.2 mAh g^(-1)的高比容量,在200.0 A g^(-1)的极高电流密度下也仍然具有高达50%的比容量保持率.本文详细分析了H_(2)MoO_(3)/PANI中超快质子传导的Grotthuss机制.基于H_(2)MoO_(3)/PANI构建的质子全电池在800.0 W kg^(-1)下的能量密度高达42.1 Wh kg^(-1).令人印象深刻的是,即使在冷冻电解质中,质子全电池仍然具有快速的质子传输能力,在-20℃保持了约70%的是室温比容量.这些优异的质子存储性能为微米尺度的电极材料在低温质子电池中的实际应用提供了重要见解.
Aqueous proton battery is considered as a promising candidate for the electrochemical energy storage system with the merits of safety,environmental benignity,fast kinetics and low cost.The realization of these advantages relies on the development of suitable and easy-access electrode materials.Herein,micron-sized H_(2)MoO_(3)/Polyaniline(PANI)is developed as a high-rate and stable anode material in proton battery.Contrary to the pseudocapacitive nature of most anode materials,the H_(2)MoO_(3)/PANI presents diffusion-controlled charge storage mechanism with both high capacity and high rate-capability.The H_(2)MoO_(3)/PANI electrode shows a rather high capacity of 268.2 mAh g^(-1)at 1.0 A g^(-1),and a surprisingly high rate-capability with50%capacity retention even at an extremely high current density of 200.0 A g^(-1).Detailed analyses demonstrate the Grotthuss mechanism of ultrafast proton conduction in H_(2)MoO_(3)/PANI.The constructed proton full cell based on H_(2)MoO_(3)/PANI delivers a high energy density of 42.1 Wh kg^(-1)at 800.0 Wkg^(-1).Impressively,the proton full cell shows fast proton transportation even in the frozen electrolyte,and-70%of the room temperature capacity is retained at20℃.These excellent proton storage behaviors provide insights into the practical applications of micron-sized electrode materials in proton batteries at low temperatures.
作者
郑一帆
张智
尹婷婷
付秀涛
陆佳宁
程斯雅
高义华
Yifan Zheng;Zhi Zhang;Tingting Yin;Xiutao Fu;Jianing Lu;Siya Cheng;Yihua Gao(Wuhan National Laboratory for Optoelectronics(WNLO),School of Physics,Huazhong University of Science and Technology(HUST),Wuhan 430074,China)
基金
supported by the National Natural Science Foundation of China(12274150,12274151)
Natural Science Foundation of Hubei Province,China(2022CFB101,2022BAD061)。
