阳极
材料科学
碳纤维
化学工程
热解
吸附
电池(电)
纳米复合材料
无机化学
复合数
纳米技术
化学
复合材料
电极
有机化学
物理
工程类
物理化学
功率(物理)
量子力学
作者
Yandong Xie,Hongwei Zhang,Kandan Wu,Xiaoqiong Wang,Deping Xiong,Miao He
标识
DOI:10.1016/j.jallcom.2022.164845
摘要
Transition metal carbide is being used as an emerging high-capacity anode material for the next-generation potassium ion batteries (PIBs). Herein, a general method was introduced for the preparation of nanocomposites from metal–organic frameworks (MOFs) coated with ammonium ferric citrate. A novel composite material of Fe3C nanoparticles was designed and prepared by pyrolysis of MOF, and embedded in graphitic carbon as a PIB anode (Fe3[email protected]–C/N). The Fe3C particles were encapsulated in an N-doped carbon shell with a hierarchical porous carbon network. N-doped porous carbon exhibited a large specific surface area and abundant carbon edge defects, which led to the increase in the number of exposed active sites, facilitating the adsorption of potassium ions. As a result, the prepared carbon material shows high structural stability, electrical conductivity, and proton conductivity. As a PIB anode, Fe3[email protected]–C/N-1 shows a high capacity of 294 mAh g−1 over 1000 cycles at 200 mA g−1, revealing its potential application as carbon material in PIB anodes.
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