Niu Rong, Ding Jie, Chen Jiajun, Zhao Zhenxin, Wang Xiaomin
College of Materials Science and Engineering, Taiyuan University of Technology, 030024, PR China.
College of Materials Science and Engineering, Taiyuan University of Technology, 030024, PR China.
J Colloid Interface Sci. 2025 Jan 15;678(Pt B):741-749. doi: 10.1016/j.jcis.2024.09.073. Epub 2024 Sep 11.
Transition metal sulfide (TMs) offers ultra-high specific capacity through multi-electron transfer, showing promise for aqueous batteries. However, the poor cycling performance and the uncleared energy storage mechanism are restricted from further development. Herein, CoS nanowire arrays grown on carbon cloth (CoS/CC) are proposed as binder-free and self-supporting electrodes for aqueous copper-ion batteries. The energy storage mechanism is clarified by a series of ex-situ tests: a multi-electron electrode reaction through a three-step reaction of CoS → CuS → CuS → CuS. Electrochemical results suggest that the CoS/CC cathode exhibits excellent long cycle stability (capacity retention of 99.7 % after 1000 cycles at 10 A/g) along with high specific capacity (762.3 mAh g at 1 A/g). The carbon cloth with stable three-dimensional (3D) conductive structure can not only offer high-speed pathways to promote the transfer of electrons but also inhibit the volume change. Meanwhile, CoS nanowire arrays with high surface-to-volume ratios can improve wettability of electrolyte and promote redox reactions. Furthermore, an advanced Zn-CoS/CC hybrid ion aqueous battery reveals an energy density of 724 Wh kg and an output voltage of 1.24 V, providing a promising strategy for the establishment of transition metal sulfide cathode in high-energy aqueous batteries.
过渡金属硫化物（TMs）通过多电子转移提供超高的比容量，在水系电池方面展现出应用前景。然而，其较差的循环性能和尚不明确的储能机制限制了它的进一步发展。在此，我们提出将生长在碳布上的硫化钴纳米线阵列（CoS/CC）用作水系铜离子电池的无粘结剂自支撑电极。通过一系列非原位测试阐明了储能机制：CoS通过三步反应CoS → CuS → CuS → CuS进行多电子电极反应。电化学结果表明，CoS/CC阴极具有出色的长循环稳定性（在10 A/g电流下循环1000次后容量保持率为99.7%）以及高比容量（在1 A/g电流下为762.3 mAh g）。具有稳定三维（3D）导电结构的碳布不仅能提供高速电子传输通道，还能抑制体积变化。同时，具有高比表面积的CoS纳米线阵列可提高电解液的润湿性并促进氧化还原反应。此外，一种先进的Zn-CoS/CC混合离子水系电池的能量密度为724 Wh kg，输出电压为1.24 V，为在高能水系电池中建立过渡金属硫化物阴极提供了一种有前景的策略。
