A 3D free-standing thin film based on N, P-codoped hollow carbon fibers embedded with MoP quantum dots as high efficient oxygen electrode for Li-O2 batteries

被引：62
作者：
Wei, Minghui [1 ]
Li, Bao [2 ]
Jin, Chao [1 ,3 ]
Ni, Yichen [1 ]
Li, Cong [1 ]
Pan, Xiaowei [1 ]
Sun, Jiawen [1 ]
Yang, Chenghao [3 ]
Yang, Ruizhi [1 ]
机构：
[1] Soochow Univ, Coll Energy, Soochow Inst Energy & Mat Innovat, Suzhou 215006, Peoples R China
[2] Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Peoples R China
[3] South China Univ Technol, Coll Environm & Energy, New Energy Res Inst, Guangzhou 510006, Guangdong, Peoples R China
来源：
ENERGY STORAGE MATERIALS | 2019年 / 17卷
基金：
中国国家自然科学基金;
关键词：
Li-O-2; batteries; Oxygen electrode; Carbon fiber; MoP; Quantum dots; FENTON DEGRADATION SYSTEM; SODIUM-ION BATTERIES; HYDROGEN EVOLUTION; TRIBOELECTRIC NANOGENERATOR; HIGH-CAPACITY; ELECTROCATALYST; CATHODE; NANOPARTICLES; CATALYSTS; OXIDE;
D O I：
10.1016/j.ensm.2018.07.012
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An efficient oxygen electrode with excellent electrocatalytic activity and mass transportation efficiency is highly desired for the practical applications of Li-O-2 batteries (LOBs). Here, we report a novel 3D free-standing film oxygen electrode based on N, P-codoped hollow carbon fiber embedded with MoP quantum dots (MoP QD@HCF). The MoP QD@HCF oxygen electrode delivers a higher discharge specific capacity of 6.75 mA h cm(-2), a lower charge voltage of < 3.85 V and an enhanced rate capability (up to 0.4 mA cm(-2)). It is ascribed to that the N, P-codoped hollow carbon fiber with open end serves as mass transfer channels and faciliates the electrons and Li+ ions transportation. DFT calculation results show that MoP is metallic and (100) crystal plane exhibits favorable surface oxygen adsorption, resulting in a superior catalytic activity towards the formation/decomposition of Li2O2. This new electrode architecture opens a promising avenue for LOBs electrode development through optimizing the electrode components and microstructure.
引用
收藏
页码：226 / 233
页数：8
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