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Cobalt ion intercalated MnO2/C as air cathode catalyst for rechargeable aluminum–air battery
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jallcom.2020.153950
Zijie Xia , Yunfeng Zhu , Wenfeng Zhang , Tongrui Hu , Tao Chen , Jiguang Zhang , Yana Liu , Huaxiong Ma , Huizheng Fang , Liquan Li

Abstract Overcoming the self-corrosion and surface passivation of aluminum anode, and the slow kinetics of cathodic electrochemical reactions are of great significance for the practical application of aluminum–air battery. In this study, we replaced the traditional aqueous electrolyte with AlCl3-urea ionic liquid electrolyte, and prepared Co–MnO2/C catalysts as cathode catalyst. Structures and electrocatalytic activity of the x % Co–MnO2/C (x is the mole percent of Co to Mn, x = 0, 10, 20, 30, 40 and 50) catalysts have been investigated systematically. After Co ions intercalation, the specific surface area of the catalyst increased and average pore diameter decreased. The unique interaction between Co ions and MnO2 led to an increase in the catalytic activity of the catalyst in the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) compared with MnO2/C. In particular, 40% Co–MnO2/C showed the largest specific surface area (154.25 m2 g−1) and the smallest average pore diameter (6.47 nm). It showed the most positive half-wave potential (0.727 V vs. RHE) and the biggest limiting current density (4.744 mA cm−2) in ORR process, and also exhibited the lowest onset potential (1.593 V) and the biggest limit current density (15.177 mA cm−2) in OER process. Furthermore, aluminum–air battery assembled with 40% Co–MnO2/C demonstrated excellent reversible charge and discharge performance, which had an average discharge voltage of 1.5 V and an average charge voltage of 2 V during 30 cycles at a limited battery capacity of 375 mAh g−1. Our results reveal the possibility of designing a rechargeable aluminum-air battery working at ambient conditions based on the Co–MnO2/C air cathode catalyst for the first time. Our work opens up a new way to achieve the rechargeability of aluminum-air batteries, and our highly active electrocatalytic materials can be used in a wider range of electrochemical energy applications.

中文翻译:

钴离子嵌入MnO2/C作为可充电铝空气电池的空气阴极催化剂

摘要 克服铝负极自腐蚀、表面钝化、阴极电化学反应动力学缓慢等问题,对铝-空气电池的实际应用具有重要意义。在这项研究中,我们用 AlCl3-尿素离子液体电解质代替了传统的水性电解质,并制备了 Co-MnO2/C 催化剂作为阴极催化剂。已经系统地研究了 x% Co-MnO2/C(x 是 Co 与 Mn 的摩尔百分比,x = 0、10、20、30、40 和 50)催化剂的结构和电催化活性。Co离子嵌入后,催化剂的比表面积增加,平均孔径减小。与 MnO2/C 相比,Co 离子和 MnO2 之间独特的相互作用导致催化剂在氧还原反应 (ORR) 和析氧反应 (OER) 中的催化活性增加。特别是,40% Co-MnO2/C 表现出最大的比表面积 (154.25 m2 g-1) 和最小的平均孔径 (6.47 nm)。它在ORR过程中表现出最正的半波电位(0.727 V vs. RHE)和最大的极限电流密度(4.744 mA cm-2),同时表现出最低的起始电位(1.593 V)和最大的极限电流密度(15.177 mA cm−2) 在 OER 过程中。此外,由 40% Co-MnO2/C 组装的铝-空气电池表现出优异的可逆充放电性能,平均放电电压为 1。5 V 和 2 V 的平均充电电压在 30 次循环期间在 375 mAh g-1 的有限电池容量。我们的研究结果首次揭示了基于 Co-MnO2/C 空气阴极催化剂设计可在环境条件下工作的可充电铝空气电池的可能性。我们的工作为实现铝-空气电池的可充电性开辟了一条新途径,我们的高活性电催化材料可用于更广泛的电化学能源应用。
更新日期:2020-05-01
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