Synthesis of Multiporous Carbons from the Water Caltrop Shell for High-Performance Supercapacitors

Chun Hsiang Hsu, Zheng Bang Pan, Chuan Ren Chen, Ming Xue Wei, Chang An Chen, Hong Ping Lin, Chun Han Hsu

研究成果: Article同行評審

22 引文 斯高帕斯(Scopus)

摘要

In this study, an economic, sustainable, and green synthesis method of multiporous carbons from agricultural waste, water caltrop shell (denoted as WCS), was presented. To prepare the WCS biochar, the dried WCS was first carbonized to a microporous carbon with a surface area of around 230 m2 g-1 by using a top-lit-updraft method. Then, the microporous WCS biochar was directly mixed with an appropriate amount of ZnO nanoparticles and KOH as activating agents via a solvent-free physical blending route. After further activation at 900 °C, the resulted carbons possess both micropores and mesopores that were named as WCS multiporous carbons. The carbon yield of the prepared WCS multiporous carbons with high surface area in the range of 1175-1537 m2 g-1 is up to 50%. Furthermore, the micropore/mesopore surface area ratio can be simply tuned by controlling the ZnO content. For supercapacitor applications, the as-prepared WCS multiporous carbon electrodes showed high specific capacitance (128 F g-1 at 5 mV s-1) with a good retention rate at 500 mV s-1 scan rate (>60% compared to the capacitance at 5 mV s-1) and low Ohmic resistance in a 1.0 M LiClO4/PC electrolyte. In addition to the ZnO nanoparticles, CaCO3 nanoparticles with low environmental impact were also used to prepare the WCS multiporous carbons. The assembled supercapacitors also demonstrate high specific capacitance (102 F g-1 at 5 mV s-1) and good retention rate (&tild;70%).

原文English
頁(從 - 到)10626-10632
頁數7
期刊ACS Omega
5
發行號18
DOIs
出版狀態Published - 2020 5月 12

All Science Journal Classification (ASJC) codes

  • 一般化學
  • 一般化學工程

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