Zhou Qiusheng, Tian Yuan, Wang Mingyuan, Lei Shuangying, Xiong Chuanyin
National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China.
SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electrical Science and Engineering, Southeast University, 210096 Nanjing, China.
J Colloid Interface Sci. 2023 Jul;641:842-852. doi: 10.1016/j.jcis.2023.03.126. Epub 2023 Mar 22.
The earth-abundant, low-cost, and efficient oxygen electrode materials offer a potential opportunity to satisfy the large-scale production and application of metal-air batteries. Herein, a molten salt-assisted strategy is developed to anchor transition metal-based active sites via in-situ confining into porous carbon nanosheet. As a result, a chitosan-based porous nitrogen-doped nanosheet decorated with the well-defined CoN (CoN/CPCN) was reported. Both structural characterization and electrocatalytic mechanisms demonstrate a prominent synergetic effect between CoN and porous nitrogen-doped carbon nanosheets forcefully accelerates the sluggish reaction kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Interestingly, the Zn-air batteries (ZABs) equipped with CoN/CPCN-900 as an air electrode shows outstanding durability for 750 discharge/charge cycles, a high power density of 189.9 mW cm, and a high gravimetric energy density of 1018.7 mWh g at 10 mA cm. Furthermore, the assembled all-solid cell displays exceptional flexibility and power density (122.2 mW cm).
地球上储量丰富、成本低廉且高效的氧电极材料为满足金属空气电池的大规模生产和应用提供了潜在机遇。在此，开发了一种熔盐辅助策略，通过原位限制将过渡金属基活性位点锚定到多孔碳纳米片中。结果，报道了一种以壳聚糖为基础、装饰有明确的CoN的多孔氮掺杂纳米片（CoN/CPCN）。结构表征和电催化机制均表明，CoN与多孔氮掺杂碳纳米片之间存在显著的协同效应，有力地加速了氧还原反应（ORR）和析氧反应（OER）缓慢的反应动力学。有趣的是，配备CoN/CPCN-900作为空气电极的锌空气电池（ZABs）在750次充放电循环中表现出出色的耐久性，在10 mA cm时具有189.9 mW cm的高功率密度和1018.7 mWh g的高重量能量密度。此外，组装的全固态电池表现出卓越的柔韧性和功率密度（122.2 mW cm）。
