Proline-derived in situ synthesis of nitrogen-doped porous carbon nanosheets with encaged

Proline-derived in situ synthesis of nitrogen-doped

porous carbon nanosheets with encaged Fe2O3@Fe3C nanoparticles for lithium-ion battery

anodes

Jingfei Zhang;Lijuan Qi;Xiaoshu Zhu;Xiaohong Yan;Yufeng Jia;Lin Xu;Dongmei Sun;Yawen Tang

【期刊名称】《纳米研究（英文版）》 【年(卷),期】2017(010)009

【摘要】The homogeneous incorporation of heteroatoms into two-dimensional C nanostructures,which leads to an increased chemical reactivity and electrical conductivity as well as enhanced synergistic catalysis as a conductive matrix to disperse and encapsulate active nanocatalysts,is highly attractive and quite challenging.In this study,by using the natural and cheap hydrotropic amino acid proline-which has remarkably high solubility in water and a desirable N content of ～12.2 wt.％-as a C precursor pyrolyzed in the presence of a cubic KC1 template,we developed a facile protocol for the large-scale production of N-doped C nanosheets with a hierarchically porous structure in a homogeneous dispersion.With concomitantly encapsulated and evenly spread Fe2O3 nano-particles surrounded by two protective ultrathin layers of inner Fe3C and outer onion-like C,the resulting N-doped graphitic C nanosheet hybrids (Fe2O3@Fe3C-NGCNs) exhibited a very

high Li-storage capacity and excellent rate capability with a reliable and prolonged cycle life.A reversible capacity as high as 857 mAh.g-1 at a current density of 100 mA·g-1 was observed even after 100 cycles.The capacity retention at a current density 10 times higher-1,000 mA.g-1-reached 680 mAh.g-1,which is 79％ of that at 100 mA·g-1,indicating that the hybrids are promising as anodes for advanced Li-ion batteries.The results highlight the importance of the heteroatomic dopant modification of the NGCNs host with tailored electronic and crystalline structures for competitive Li-storage features. 【总页数】14页(3164-3177) 【关键词】

【作者】Jingfei Zhang;Lijuan Qi;Xiaoshu Zhu;Xiaohong Yan;Yufeng Jia;Lin Xu;Dongmei Sun;Yawen Tang

【作者单位】Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional

Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Analysis and Testing Center, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China 【正文语种】英文