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MnO2 Nanowires Anchored with Graphene Quantum Dots for Stable Aqueous Zinc-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-10-12 , DOI: 10.1021/acsaem.1c01905 Ruiting Guo 1 , Lianshan Ni 1 , Hao Zhang 1 , Xu Gao 1 , Roya Momen 1 , Abouzar Massoudi 2 , Guoqiang Zou 1 , Hongshuai Hou 1 , Xiaobo Ji 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-10-12 , DOI: 10.1021/acsaem.1c01905 Ruiting Guo 1 , Lianshan Ni 1 , Hao Zhang 1 , Xu Gao 1 , Roya Momen 1 , Abouzar Massoudi 2 , Guoqiang Zou 1 , Hongshuai Hou 1 , Xiaobo Ji 1
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Rechargeable aqueous zinc-ion batteries (ZIBs) hold tremendous potential for large-scale energy storage applications due to the natural abundance, low cost, and high ambient safety of Zn. Also, manganese oxides are the most representative cathode materials with the appropriate voltage platform and high specific theoretical capacity at present. However, the rapid capacity fading and sluggish transport kinetics are urgent issues waiting to be solved effectively. Thus, MnO2 nanowires anchored with graphene quantum dots (GQDs) are designed and studied as cathode materials for ZIBs. The GQDs can accelerate the transport kinetics as well as inhibit the dissolution of manganese during cycling. As a result, the MnO2-40GQD electrode can exhibit a high reversible specific capacity of 295.7 mA h g–1 at 0.1 A g–1 and a superior capacity retention of 88.99% with the excellent Coulombic efficiency of almost 100% after 100 cycles, which is more than 4 times that of pure MnO2 (the capacity retention of 22.90%).
中文翻译：
用石墨烯量子点锚定的 MnO2 纳米线用于稳定的水性锌离子电池
由于锌的天然丰度、低成本和高环境安全性，可充电水性锌离子电池（ZIBs）在大规模储能应用中具有巨大的潜力。此外，锰氧化物是目前最具代表性的正极材料，具有合适的电压平台和高比理论容量。然而，快速容量衰减和缓慢的输运动力学是有待有效解决的紧迫问题。因此，设计并研究了锚定石墨烯量子点 (GQD) 的MnO 2纳米线作为 ZIB 的阴极材料。GQDs 可以加速传输动力学并抑制循环过程中锰的溶解。因此，MnO 2-40GQD 电极在 0.1 A g –1 时具有 295.7 mA hg –1的高可逆比容量和 88.99% 的优异容量保持率，100 次循环后库仑效率接近 100%，是其 4 倍以上纯MnO 2 (容量保持率为22.90%)。
更新日期：2021-10-25
中文翻译：
用石墨烯量子点锚定的 MnO2 纳米线用于稳定的水性锌离子电池
由于锌的天然丰度、低成本和高环境安全性，可充电水性锌离子电池（ZIBs）在大规模储能应用中具有巨大的潜力。此外，锰氧化物是目前最具代表性的正极材料，具有合适的电压平台和高比理论容量。然而，快速容量衰减和缓慢的输运动力学是有待有效解决的紧迫问题。因此，设计并研究了锚定石墨烯量子点 (GQD) 的MnO 2纳米线作为 ZIB 的阴极材料。GQDs 可以加速传输动力学并抑制循环过程中锰的溶解。因此，MnO 2-40GQD 电极在 0.1 A g –1 时具有 295.7 mA hg –1的高可逆比容量和 88.99% 的优异容量保持率，100 次循环后库仑效率接近 100%，是其 4 倍以上纯MnO 2 (容量保持率为22.90%)。
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