Enhanced electrocatalytic performance of Fe-TiO2/N-doped graphene cathodes for rechargeable Li-O2 batteries

Enhanced electrocatalytic performance of Fe-TiO2/N-doped graphene cathodes for rechargeable Li-O2 batteries
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用于可充电Li-O2电池的Fe-TiO2/N掺杂石墨烯阴极的增强电催化性能

DOI:
10.1007/s10008-017-3841-7
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发表时间:
2018-03
影响因子:
2.5
通讯作者:
Ren Xiangzhong
Ren Xiangzhong
中科院分区:
工程技术4区
文献类型:
--
作者:
Yang Jingbo;Li Yongliang;Mi Hongwei;Zhang Peixin;Deng Libo;Sun Lingna;Ren Xiangzhong

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在氮掺杂石墨烯(Fe-TiO2/ n-掺杂石墨烯)电催化剂上合成了Fe3+掺杂TiO2,并将其用作Li-O2电池正极材料。Fe-TiO2纳米粒子在n掺杂石墨烯上分散均匀,团聚现象较少。Fe-TiO2/ n掺杂石墨烯电催化剂电化学性能的提高是由于电子和结构性质的改变,导致TiO2晶体结构中形成Ti-O-Fe键和氧空位。Fe-TiO2/ n掺杂石墨烯电极的放电容量为13,500 mA h g - 1(催化),循环保留45个循环,与原始电极相比,这要好得多。
The Fe3+-doped TiO2 on nitrogen-doped graphene (Fe-TiO2/N-doped graphene) electrocatalyst is synthesized and employed as cathode material for Li-O2 battery. Fe-TiO2 nanoparticles show uniform dispersion on N-doped graphene with less agglomeration compared with TiO2 nanoparticles. The improvement of electrochemical performance of Fe-TiO2/N-doped graphene electrocatalyst is due to the changed electronic and structural properties, which result in forming Ti–O–Fe bonds and oxygen vacancy sites in the crystalline structure of TiO2. The Fe-TiO2/N-doped graphene electrode delivers a discharge capacity of 13,500 mA h g−1(catalytic) and a cyclic retention of 45 cycles, which are much better compared to the pristine counterpart.
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