无机材料学报 ›› 2023, Vol. 38 ›› Issue (8): 954-962.DOI: 10.15541/jim20220711 CSTR: 32189.14.10.15541/jim20220711

所属专题: 【能源环境】超级电容器,锂金属电池,钠离子电池和水系电池(202409) 【能源环境】超级电容器(202409)

• 研究论文 • 上一篇    下一篇

双模板-水热炭化制备马蹄形中空多孔炭及其电化学性能

徐州(), 刘宇轩, 池俊霖, 张婷婷, 王姝越, 李伟, 马春慧, 罗沙(), 刘守新()   

  1. 东北林业大学 生物质材料科学与技术教育部重点实验室, 哈尔滨 150040
  • 收稿日期:2022-11-28 修回日期:2023-02-25 出版日期:2023-03-24 网络出版日期:2023-03-24
  • 通讯作者: 罗 沙, 工程师. E-mail: luo.sha.85@163.com;
    刘守新, 教授. E-mail: liushouxin@126.com
  • 作者简介:徐 州(1993-), 男, 博士研究生. E-mail: xuzhou0194@126.com
  • 基金资助:
    国家自然科学基金(31971601);中央高校基本科研业务费专项资金(2572021BB12);东北林业大学大学生国家级创新训练计划(202210225234)

Horseshoe-shaped Hollow Porous Carbon: Synthesis by Hydrothermal Carbonization with Dual-template and Electrochemical Property

XU Zhou(), LIU Yuxuan, CHI Junlin, ZHANG Tingting, WANG Shuyue, LI Wei, MA Chunhui, LUO Sha(), LIU Shouxin()   

  1. Key Laboratory of Bio-based Material Science & Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
  • Received:2022-11-28 Revised:2023-02-25 Published:2023-03-24 Online:2023-03-24
  • Contact: LUO Sha, engineer. E-mail: luo.sha.85@163.com;
    LIU Shouxin, professor. E-mail: liushouxin@126.com
  • About author:XU Zhou (1993-), male, PhD candidate. E-mail: xuzhou0194@126.com
  • Supported by:
    National Natural Science Foundation of China(31971601);Fundamental Research Funds for the Central Universities(2572021BB12);National Undergraduate Training Programs for Innovations(202210225234)

摘要:

以木糖为碳源, 利用嵌段共聚物聚环氧乙烷-聚环氧丙烷-聚环氧乙烷 (P123)/十二烷基硫酸钠(SDS)混合乳液构筑微反应器, 水热炭化制备马蹄形中空多孔炭。研究表明木糖在微反应器与溶液界面发生水热反应, 160 ℃水热条件下P123的亲水聚环氧乙烷嵌段(PEO)亲水性下降并向乳液内部增溶, 使乳液逐渐润胀和破裂。P123/SDS质量比会影响微反应器的完整度, 而水热时间可以调控微反应器的开口角度和空腔直径。开放性空腔能储存更多电荷和离子并缩短传输距离, 使多孔炭的比电容和能量密度增大且与空腔直径呈正相关关系。当P123/SDS质量比为1.25 : 1、水热时间为12 h时, 马蹄形中空多孔炭的开口角度(63°)和空腔直径(80 nm)最大、电化学性能最佳, 在6 mol·L-1 KOH三电极体系中电流密度1 A·g-1时比电容达292 F·g-1; 在两电极体系中电流密度0.2 A·g-1时比电容达185 F·g-1, 能量密度达6.44 Wh·kg-1; 电流密度5 A·g-1时5000次充放电循环后电容保持率达94.83%。

关键词: 马蹄形, 中空多孔炭, 木糖, 水热炭化, 模板, 界面

Abstract:

The microreactor was constructed by using the block copolymer (P123)/sodium dodecyl sulfate (SDS) hybrid emulsion. Horseshoe-shaped hollow porous carbon was prepared by hydrothermal carbonization of xylose. The results showed that hydrothermal reaction of xylose occurred at interface between microreactor and solution. Hydrophilicity of PEO (hydrophilic block in P123) decreased at hydrothermal temperature of 160 ℃. Hybrid emulsion was swelled and destroyed gradually because PEO ran into the interior of emulsion. Furthermore, the morphology of microreactor could be regulated by the mass ratio of P123/SDS and the opening angle, and cavity diameter could be controlled by the hydrothermal time. Owing to the open cavity, the capacity of charges and ions was magnified and transport distance was reduced. In addition, specific capacitance and energy density of porous carbons were improved and showed positive correlation with cavity diameter. The horseshoe-shaped hollow porous carbon with largest opening angle (63°), cavity diameter (80 nm) and optimal supercapacitor performance was obtained at a P123/SDS mass ratio of 1.25 : 1 by hydrothermal method for 12 h. In a three-electrode system, the product showed a high specific capacitance of 292 F·g-1 at a current density of 1 A·g-1. In a two-electrode system, the product showed an excellent energy density (6.44 Wh·kg-1), specific capacitance of 185 F·g-1 at a current density of 0.2 A·g-1 and outstanding cycling stability (94.83%) after 5000 cycles at a current density of 5 A·g-1.

Key words: horseshoe-shape, hollow porous carbon, xylose, hydrothermal carbonization, template, interface

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