In this section, you can access to the latest technical information related to the FUTURE project topic.

Achieving high energy efficiency of alkaline hybrid zinc battery by using the optimized Co?Mn spinel cathode

As a potential candidate in the future energy storage system, Zinc-air batteries (ZABs) are impeded by their insufficient discharge voltages and low charge-discharge efficiencies. Building the alkaline hybrid zinc batteries (AHZBs) combining ZAB and alkaline zinc/cobalt batteries (ZCB) at the battery level can supply an effective strategy to solve these problems. In this work, we fabricate a self-supported Mn?Co spinel electrode (named as MnCo2O4) with the porous nanofiber morphology by a facile hydrothermal method and assemble AHZB. Thanks to the large electrochemical active surface area and appropriate ratio of Co2+/Co3+, the as-prepared MnCo2O4 electrode shows both the high bifunctional oxygen catalytic activities for ZABs and metal ion redox properties for ZCBs. AHZB with the self-supported MnCo2O4 electrode possesses two voltage platforms in both charge and discharge processes due to the oxygen evolution/reduction reactions (OER/ORR) ZABs and metal ion redox reaction in ZCBs. Besides of the highly power density and excellent cyclic stability, the charge-discharge efficiency of our AHZB with the self-supported MnCo2O4 electrode can reach 86.2%, almost being the highest value in the recent works. Our work supplies a viable strategy for developing high-performance ZABs with improved discharge voltage and charge-discharge efficiency.

» Author: Jiaqun Zou, Bin Chen, Baoyuan Li, Mingming Yin, He Miao, Fu Wang, Chunfei Zhang, Houcheng Zhang, Jinliang Yuan

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