材料科学
催化作用
吸附
锌
密度泛函理论
电子转移
带材弯曲
氧气
碳纤维
化学工程
纳米技术
计算化学
物理化学
化学
复合材料
有机化学
冶金
工程类
复合数
光电子学
作者
Yangyang Tan,Zeyi Zhang,Suhao Chen,Wei Wu,Liyue Yu,Runzhe Chen,Fei Guo,Zichen Wang,Niancai Cheng
标识
DOI:10.1002/adfm.202311337
摘要
Abstract Local geometric strain engineering is useful for modulating the performance of nitrogen‐coordinated transition metal‐carbon catalysts. However, realizing the nano‐level strain is technically challenging. Additionally, the structure‐property relationship between strain degree and performance remains poorly understood. Herein, it is conceptually predict that geometric bending induces more electron transfer from Zn to the coordinated N in Zn─N─C, leading to a positive shift of the d‐band center of the Zn atom, which promotes the adsorption reduction process of the O 2 molecule and thus increases the intrinsic oxygen reduction reaction (ORR) activity. Moreover, a low‐temperature non‐saturated coordination strategy is proposed to prepare spherical porous carbon catalysts with surface‐enriched geometrically bent (20‐50°) Zn─N─C sites. Benefiting from the highly active Zn─N─C sites, large specific surface area and abundant pore structure, the optimized catalyst (S─Zn─N─C‐950) exhibited excellent intrinsic alkaline ORR activity (half‐wave potential E 1/2 = 0.89 V) and high zinc‐air battery performance (peak power density of 229.2 mW cm −2 ), exceeding that of commercial Pt/C catalysts. Density functional theory (DFT) calculations show that when the geometrical bending angle is 30–45°, Zn centers with suitable charge transfer to the surrounding N can produce a moderate adsorption strength to the oxygen intermediate state, resulting in optimal ORR activity.
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