Phase boundary engineering of metal-organic-framework-derived carbonaceous nickel selenides for sodium-ion batteries  

作　　者：Shiyao Lu Hu Wu Jingwei Hou Limin Liu Jiao Li Chris J.Harris Cheng-Yen Lao Yuzheng Guo Kai Xi Shujiang Ding Guoxin Gao Anthony K.Cheetham R.Vasant Kumar 

机构地区：[1]Xi’an Key Laboratory of Sustainable Energy Materials Chemistry,MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,State Key Laboratory of Electrical Insulation and Power Equipment,School of Chemistry,Xi’an Jiaotong University&Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power,Xi’an Jiaotong University,Xi’an,710049,China [2]Department of Materials Science and Metallurgy,University of Cambridge,Cambridge,CB30FS,UK [3]Cambridge Graphene Centre,Department of Engineering,University of Cambridge,Cambridge,CB30FA,UK [4]Department of Chemistry,City University of Hong Kong,Hong Kong,999077,Hong Kong,China [5]School of Electrical Engineering and Automation,Wuhan University,Wuhan,430072,China [6]Materials Research Laboratory,University of California,Santa Barbara,CA,93106,USA [7]School of Chemical Engineering,University of Queensland,St Lucia,QLD,4072,Australia

出　　处：《Nano Research》2020年第8期2289-2298,共10页纳米研究（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(No.51773165);Project of National Defense Science and Technology Innovation Special Zone(No.JZ-20171102);Shaanxi Post-doctoral Foundation(No.2016BSHYDZZ20);Key Laboratory Construction Program of Xi’an Municipal Bureau of Science and Technology(No.201805056ZD7CG40);Innovation Capability Support Program of Shaanxi(No.2018PT-28,2019PT-05);The numerical calculations in this paper have been done on the supercomputing system in the Supercomputing Center of Wuhan University.A.K.C.thanks the Ras al Khaimah Centre for Advanced Materials for financial support.J.H.thanks the financial support(No.DE190100803)。

摘　　要：Nano Research volume 13,pages2289–2298(2020)Cite this article 347 Accesses 1 Altmetric Metrics details Abstract Sodium-ion batteries(SIBs)are promising power sources due to the low cost and abundance of battery-grade sodium resources,while practical SIBs suffer from intrinsically sluggish diffusion kinetics and severe volume changes of electrode materials.Metal-organic framework(MOFs)derived carbonaceous metal compound offer promising applications in electrode materials due to their tailorable composition,nanostructure,chemical and physical properties.Here,we fabricated hierarchical MOF-derived carbonaceous nickel selenides with bi-phase composition for enhanced sodium storage capability.As MOF formation time increases,the pyrolyzed and selenized products gradually transform from a single-phase Ni3Se4 into bi-phase NiSex then single-phase NiSe2,with concomitant morphological evolution from solid spheres into hierarchical urchin-like yolk-shell structures.As SIBs anodes,bi-phase NiSex@C/CNT-10h(10 h of hydrothermal synthesis time)exhibits a high specific capacity of 387.1 mAh/g at 0.1 A/g,long cycling stability of 306.3 mAh/g at a moderately high current density of 1 A/g after 2,000 cycles.Computational simulation further proves the lattice mismatch at the phase boundary facilitates more interstitial space for sodium storage.Our understanding of the phase boundary engineering of transformed MOFs and their morphological evolution is conducive to fabricate novel composites/hybrids for applications in batteries,catalysis,sensors,and environmental remediation.

关 键 词：metal organic frameworks phase boundary carbon nanotube metal selenides sodium ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]