Chitosan with various degrees of carboxylation as hydrogel electrolyte for pseudo solid-state supercapacitors

Chen Hsueh Lin, Po Hsin Wang, Wei Ni Lee, Wei Cheng Li, Ten Chin Wen

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

Chitosan (CS), an eco-friendly amino polysaccharide with various degrees of carboxylation (DC) as hydrogel electrolyte for symmetric pseudo solid-state supercapacitors is investigated. The carboxylated reaction is carried out at pH of 6,8, and 10 for products denoted as CCS6, CCS8, and CCS10, respectively. The DC of CCS6, CCS8, and CCS10 is 100.9%, 20%, and 17.8% from the calculation of nuclear magnetic resonance spectra. Both hydrophilicity and water retention capability increase with the increase in DC. Thus, CCS6 hydrogel possesses the smallest contact angle and the largest fraction of heterogeneous melting peaks evidenced by contact angle measurement and differential scanning calorimetry. As for supercapacitor performances, Warburg region resistances of CS, CCS6, CCS8, and CCS10 are estimated as 0.5, 0.2, 0.1, and 0.45(Ω∙cm2). Therefore, interfacial ion diffusion resistance decreases with the increase in DC. Additionally, CCS6 with the highest DC results in the largest electrochemical window of 1.8 V. At current density of 1A∙g−1, the specific capacitances of CS, CCS6, CCS8, and CCS10 supercapacitors are 35F∙g-1, 72.5F∙g−1, 49.2F∙g−1, and 40.5F∙g−1. Among all hydrogel electrolytes, CCS6 possesses the highest DC, the smallest ion diffusion resistance, the largest electrochemical window, and the largest specific capacitance.

原文English
文章編號229736
期刊Journal of Power Sources
494
DOIs
出版狀態Published - 2021 5月 15

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 能源工程與電力技術
  • 物理與理論化學
  • 電氣與電子工程

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