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Spent alkaline battery-derived manganese oxides as efficient oxygen electrocatalysts for Zn–air batteries†
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2018-07-18 00:00:00 , DOI: 10.1039/c8qi00404h
Jing Meng 1, 2, 3, 4, 5 , Fangming Liu 1, 2, 3, 4, 5 , Zhenhua Yan 1, 2, 3, 4, 5 , Fangyi Cheng 1, 2, 3, 4, 5 , Fujun Li 1, 2, 3, 4, 5 , Jun Chen 1, 2, 3, 4, 5
Affiliation  

Manganese oxides were derived from spent commercial AA-type alkaline Zn–MnO2 batteries (ZMBs) via a facile route and applied as effective oxygen electrocatalysts for Zn–air batteries (ZABs). After leaching in dilute acid and annealing in air at mild temperature, the cathode dismantled from the battery discharged to 0.8 V is converted from γ-MnO2 into ε-MnO2, which features abundant defects, a porous structure and a high surface area and shows high activity in catalyzing the oxygen reduction/evolution reaction (ORR/OER). Remarkably, the recycled manganese oxide from one ZMB is estimated to sustain 1000 coin-type ZABs, which could potentially deliver a total capacity of 675 A h and an energy of 810 W h. Additionally, a rechargeable ZAB assembled with the recycled ε-MnO2 exhibits a considerable charge–discharge voltage separation of 0.65 V at 2 mA cm−2. Furthermore, we show that the hydrothermally prepared α-MnO2 serves initially as a cathode in a ZMB and directly functions as an efficient air electrode in a ZAB at its discharged states. This study offers a unique way to synthesize active manganese oxide electrocatalysts and a promising strategy to recycle spent batteries.

中文翻译:

废碱性电池衍生的锰氧化物可作为锌-空气电池的有效氧电催化剂

锰氧化物通过一种简便的途径从AA型碱性碱性Zn-MnO 2电池(ZMBs)中提取而来,并用作Zn-air电池(ZABs)的有效氧电催化剂。在温和的温度在稀酸中和退火浸出在空气中后,从电池拆开阴极放电到0.8V,从γ-MnO的转换2为ε-的MnO 2具有丰富的缺陷,多孔结构和高表面积,并在催化氧还原/放出反应(ORR / OER)中表现出高活性。值得注意的是,据估计一个ZMB的再生锰氧化物可承受1000个硬币型ZAB,这可能提供的总容量为675 A h,能量为810 W h。此外,可再充电ZAB组装在再生ε-的MnO 2表现出0.65 V的相当大的充放电电压的分离以2mA厘米-2。此外,我们表明,水热备α-的MnO 2最初在ZMB中用作阴极,并在放电状态下直接用作ZAB中的高效空气电极。这项研究为合成活性锰氧化物电催化剂提供了独特的方法,并且为回收废电池提供了一种有前途的策略。
更新日期:2018-07-18
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