General Recyclable Redox-Metallothermic Reaction Route to Hierarchically Porous Carbon/Metal Composites

Citation data:

Chemistry of Materials, ISSN: 0897-4756, Vol: 28, Issue: 12, Page: 4403-4408

Publication Year:
2016
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/19991
DOI:
10.1021/acs.chemmater.6b01459
Author(s):
Lee, Kyung Joo, Choi, Sinho, Park, Soojin, Moon, Hoi Ri
Publisher(s):
American Chemical Society (ACS), AMER CHEMICAL SOC
Tags:
Chemistry, Chemical Engineering, Materials Science, METAL-ORGANIC FRAMEWORK, LITHIUM-ION BATTERIES, HIGH-SURFACE-AREA, NANOPOROUS CARBON, COORDINATION-POLYMER, DIRECT CARBONIZATION, ANODE MATERIAL, DOPED CARBON, PERFORMANCE, GERMANIUM
article description
Herein, we develop a general synthetic route to obtain composites of porous carbon and electrochemically active metal particles such as Ge, In, Bi, and Sn. The thermolysis of a Zn-based metal-organic framework (MOF) produces hierarchically porous carbon (HPC) and metallic Zn at high temperatures, which can act as a reducing agent of metal oxides. In the reaction system of a Zn-based MOF with GeO, in situ evolved Zn reduces GeO, producing Ge and ZnO. Interestingly, ZnO is automatically reduced to Zn via a carbothermic reduction during the conversion process, which returns reducing agent to the reaction. Thus, the repeated occurrence of the zincothermic and carbothermic reduction reactions promotes a recyclable redox-metallothermic reaction. After complete reduction of GeO, Zn metal is spontaneously vaporized to yield Ge/HPC composites. This facile method can be successfully extended to other metal oxides including InO, BiO, and SnO. The as-synthesized Ge/HPC is tested as a rechargeable battery anode material, which exhibits a reversible capacity as high as 600 mA h gafter 300 cycles at a rate of 0.5 C and a low electrode volume expansion (less than 30%).

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