文献类型：期刊文献

英文题名："Protrusions'' or "holes'' in graphene: which is the better choice for sodium ion storage?

作者：Yang, Yijun[1];Tang, Dai-Ming[2];Zhang, Chao[2];Zhang, Yihui[1];Liang, Qifeng[3];Chen, Shimou[4];Weng, Qunhong[2];Zhou, Min[2];Xue, Yanming[2];Liu, Jiangwei[2];Wu, Jinghua[5];Cui, Qiu Hong[1];Lian, Chao[1];Hou, Guolin[4];Yuan, Fangli[4];Bando, Yoshio[2,6];Golberg, Dmitri[2,7];Wang, Xi[1]

机构：[1]Beijing Jiaotong Univ, Sch Sci, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China;[2]Natl Inst Mat Sci, World Premier Int Ctr Mat Nanoarchitecton WPI MAN, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan;[3]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[4]Chinese Acad Sci, Inst Proc Engn, Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China;[5]Soochow Univ, Coll Nano Sci & Technol, Suzhou 215123, Jiangsu, Peoples R China;[6]Univ Wollongong, AIIM, Squires Way, North Wollongong, NSW 2500, Australia;[7]Queensland Univ Technol, Fac Sci & Engn, 2 George St, Brisbane, Qld 4000, Australia

年份：2017

卷号：10

期号：4

起止页码：979

外文期刊名：ENERGY & ENVIRONMENTAL SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000398909900017)、、EI(收录号：20172203720521)、Scopus(收录号：2-s2.0-85019730589)、WOS

基金：The authors appreciate the support from the "1000 Youth Talent plan'' project and the "Excellent One Hundred'' project of Beijing Jiaotong University. This work was also supported by the World Premier International (WPI) Research Center on Materials Nanoarchitectonics (MANA), MEXT, Japan. The authors acknowledge stimulating discussion and help from Dr Xizheng Liu in AIST, Japan. The calculations were performed on the Shanghai Super-computer Center. Dr Qifeng Liang acknowledges the support from the National Natural Science Foundation of China (NSFC) No. 11574215 and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, the State Education Ministry of China. D. G. is grateful to the Australian Research Council for granting a Laureate Fellowship.

语种：英文

外文关键词：Anodes - Density functional theory - Design for testability - Doping (additives) - Graphene - High resolution transmission electron microscopy - In situ processing - Lithium-ion batteries - Metal ions - Nitrogen

外文摘要：The main challenge associated with sodium-ion battery (SIB) anodes is a search for novel candidate materials with high capacity and excellent rate capability. The most commonly used and effective route for graphene-based anode design is the introduction of in-plane "hole'' defects via nitrogen-doping; this creates a spacious reservoir for storing more energy. Inspired by mountains in nature, herein, we propose another way -the introduction of blistering in graphene instead of making "holes''; this facilitates adsorbing/ inserting more Na+ ions. In order to properly answer the key question: ""protrusions'' or "holes'' in graphene, which is better for sodium ion storage?'', two types of anode materials with a similar doping level were designed: a phosphorus-doped graphene (GP, with protrusions) and a nitrogen-doped graphene (GN, with holes). As compared with GN, the GP anode perfectly satisfies all the desired criteria: it reveals an ultrahigh capacity (374 mA h g(-1) after 120 cycles at 25 mA g(-1)) comparable to the best graphite anodes in a standard Li-ion battery (B372 mA h g(-1)), and exhibits an excellent rate capability (210 mA h g(-1) at 500 mA g(-1)). In situ transmission electron microscopy (TEM) experiments and density functional theory (DFT) calculations were utilized to uncover the origin of the enhanced electrochemical activity of "protrusions'' compared to "holes'' in SIBs, down to the atomic scale. The introduction of protrusions through P-doping into graphene is envisaged to be a novel effective way to enhance the capacity and rate performance of SIBs.