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Effect of Molten Salt Hydrate Treatment on the Electrochemical Performance of Woody Biomass-based Porous Carbon Materials
Received:August 06, 2020  
DOI：10.11980/j.issn.0254-508X.2020.12.004
Key Words:poplar sapwood chips  inorganic molten salt hydrate  activation  porous carbon material  electrochemical performance
Fund Project:制浆造纸工程国家重点实验室开放基金项目（201823）。
Author NameAffiliationPostcode
LIU Xiuzhi Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
WANG Xiaodi Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
REN Xiaoli Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
JIANG Tongbao Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
WU Kaili Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
LUO Kaisheng Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
LIU Wei Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 300457
HOU Qingxi Tianjin Key Lab of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457
State Key Lab of Pulp and Paper Engineering， South China University of Technology， Guangzhou， Guangdong Province， 510640 		510640
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Abstract:Fast-growing poplar sapwood chips were used as raw materials for autohydrolysis pretreatment， and both inorganic molten-salt hydrates and the autohydrolyzed poplar sapwood （APW） chips were added into the hydrochloric acid solution for immersion. The resultant APW chips were then freeze-dried， carbonized， washed respectively with dilute-acid solution and deionized water， and dried successively， and a woody biomass-based porous carbon material was finally obtained. The effect of APW chips activated with different inorganic molten-salt hydrates on the physical structure and properties of the porous carbon materials was explored， and the electrochemical performance was also tested as the porous carbon material was used as a supercapacitor electrode. The results showed that the activation treatment with inorganic molten-salt hydrate ZnCl2 and ZnCO3 in hydrochloric acid solution was beneficial to improving the electrochemical performance of woody biomass-based porous carbon materials， while the former was more effective than the latter. And the woody biomass-based porous carbon materials prepared by ZnCl2 had more disordered structure. When used as a electrode material in a supercapacitor， the porous carbon material prepared with the combined activation of ZnCl2 and ZnCO3 was more advantageous in the electrochemical performance under a certain total-amount of the activator. At a current density of 0.2 A/g， its specific capacity reached 143.20 F/g. After 5000 cycles of charge-discharge process at the current density of 2.0 A/g， the retention of specific capacitance was as high as 99.90%， indicating that the material had fine cycle stability. In addition， at a scanning rate of 10 mV/s， its cyclic voltammetry curve maintained a well-closed and approximately rectangular shape.
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