清华大学王定胜团队在二维超薄氮掺杂碳纳米片上设计双单原子位获得超低温锌空气电池。相关研究成果于2022年1月6日发表于国际顶尖学术期刊《德国应用化学》。

该文中，研究人员构建了一种新型的双单原子催化剂，该催化剂在具有多孔结构的2D超薄掺氮碳纳米片（FeMn-DSAC）上包含相邻的Fe-N4和Mn-N4位，用作柔性低温锌空气电池（ZAB）的阴极。FeMn-DSAC对氧还原反应和析氧反应具有显著的双功能活性。

控制实验和密度泛函理论计算表明，增强的催化活性来源于促进*OOH分解的Fe-Mn双位点协同效应以及促进反应过程中活性暴露和传质的多孔2D纳米片结构。FeMn DSAC优异的双功能活性使得所制备的ZAB在-40℃的超低温下高效运行，具有30 mW cm^-2的峰值功率密度，并保持与室温对应的高达86%的比容量，是先前报告结果中的顶级性能。

附：英文原文

Title: Engineering Dual Single-Atom Sites on 2D Ultrathin N-doped Carbon Nanosheets Attaining Ultra-Low Temperature Zn-Air Battery

Author: Tingting Cui, Yun-Peng Wang, Tong Ye, Jiao Wu, Zhiqiang Chen, Jiong Li, Yongpeng Lei, Dingsheng Wang, Yadong Li

Issue&Volume: 2022-01-06

Abstract: Herein, a novel dual single-atom catalyst comprising adjacent Fe-N4 and Mn-N4 sites on 2D ultrathin N-doped carbon nanosheets with porous structure (FeMn-DSAC) was constructed as the cathode for a flexible low-temperature Zn-air battery (ZAB). FeMn-DSAC exhibits remarkable bifunctional activities for oxygen reduction reaction and oxygen evolution reaction. Control experiments and density functional theory calculations reveal that the augmenting catalytic activity arises from Fe-Mn dual-sites synergistic effect facilitating *OOH dissociation as well as the porous 2D nanosheet structure promoting active sits exposure and mass transfer during the reaction process. The excellent bifunctional activity of FeMn-DSAC renders the fabricated ZAB operating efficiently at ultra-low temperature of -40 ℃, delivering 30 mW cm-2 peak power density and retaining up to 86% specific capacity from the room temperature counterpart, representing the top-level performance among previously reported results.

DOI: 10.1002/anie.202115219

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202115219