Affiliation:
1. State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Department of Chemical Physics University of Science and Technology of China Anhui 230026 Hefei China
Abstract
AbstractDespite their high output voltage and safety advantages, rechargeable alkaline nickel‐zinc batteries face significant challenges associated with the cathodic side reaction of oxygen evolution, which results in low energy efficiency (EE) and poor stability. Herein, we propose to leverage the side oxygen evolution reaction (OER) in nickel‐zinc batteries by coupling electrocatalysts for oxygen reduction reactions (ORR) in the cathode, thus constructing an air breathing cathode. Such a novel battery (Ni‐ZnAB), designed in a pouch‐type cell with a lean electrolyte, exhibits an outstanding EE of 85 % and a long cycle life of 100 cycles at 2 mA cm−2, which are significantly superior to those of traditional Ni‐Zn batteries (54 %, 50 cycles). Compared to Ni‐Zn, the enhanced EE of Ni‐ZnAB is attributed to the contribution from ORR, while the improved cycling stability is because the stability of the anode, cathode and electrolyte are also enhanced in Ni‐ZnAB. Furthermore, an ultrahigh stability of 500 cycles with an average EE of 84 % at 2 mA cm−2 was achieved using a mold cell with rich electrolyte, demonstrating the strong application potential of Ni‐ZnAB.
Funder
National Natural Science Foundation of China
Cited by
2 articles.
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