Atomically dispersed zincophilic sites in N,P-codoped carbon macroporous fibers enable efficient Zn metal anodes

• Main Authors: Zeng, Yinxiang, Pei, Zhihao, Luan, Deyan, Lou, Xiong Wen David
• 其他作者: School of Chemical and Biomedical Engineering
• 格式: Article
• 語言: English
• 出版: 2023
• 主題: Engineering::Chemical engineering; Anodes; Copper
• 在線閱讀: https://hdl.handle.net/10356/169917
• 機構: Nanyang Technological University

Zn dendrite growth and undesired parasitic reactions severely restrict the practical use of deep-cycling Zn metal anodes (ZMAs). Herein, we demonstrate an elaborate design of atomically dispersed Cu and Zn sites anchored on N,P-codoped carbon macroporous fibers (denoted as Cu/Zn-N/P-CMFs) as a three-dimensional (3D) versatile host for efficient ZMAs in mildly acidic electrolyte. The 3D macroporous frameworks can alleviate the structural stress and suppress Zn dendrite growth by spatially homogenizing Zn2+ flux. Moreover, the well-dispersed Cu and Zn atoms anchored by N and P atoms maximize the utilization as abundant active nucleation sites for Zn plating. As expected, the Cu/Zn-N/P-CMFs host presents a low Zn nucleation overpotential, high reversibility, and dendrite-free Zn deposition. The Cu/Zn-N/P-CMFs-Zn electrode exhibits stable Zn plating/stripping with low polarization for 630 h at 2 mA cm-2 and 2 mAh cm-2. When coupled with a MnO2 cathode, the fabricated full cell also shows impressive cycling performance even when tested under harsh conditions.