Electrochromic Characteristics of Nitrogen-Doped Graphene/TiO₂ Nanocomposite Electrodes

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• 作者：Chien-Hsin Yang ; ^{yangch@nuk.edu.tw" class="auth_mail} ; Shih-Ming Chen ; Tzong-Liu Wang ; Yeong-Tarng Shieh
• 关键词：electrochromic device ; nitrogen-doped graphene ; titanium dioxide ; mesoporous film ; poly(3-methylthiophene)
• 刊名：Electrochimica Acta
• 出版年：20 March, 2014
• 年：2014
• 卷：123
• 期：Complete
• 页码：268-277
• 全文大小：2363 K

文摘

Nitrogen-doped graphene (NDG)/titanium dioxide (TiO₂) nanoparticles were coated on indium-tin oxide (ITO) glass substrates to fabricate NDG-TiO₂ nanocomposite electrodes. 3-methylthiophene (3MT) was electrochemically deposited on the NDG-TiO₂ films to form poly(3-methylthiophene) (P3MT/NDG/TiO₂) composite electrochromic electrodes. The introduction of NDG and TiO₂ mesoporous films significantly increased the initial maximum optical contrast (螖T%) to 70% as compared 41% of pure ITO electrodes, whereas the P3MT/NDG/TiO₂ composite electrodes enhanced the adhesion of P3MT polymers to the NDG/TiO₂/ITO substrate, thereby increasing the long-term stability of the corresponding electrochromic devices. Experimental results reveal that P3MT/NDG/TiO₂ composite electrodes retained up to 90% of 螖T%, relative to 70% remaining 螖T% of pure ITO electrodes. This illustrates the enhanced long-term stability achieved through the introduction of a NDG-TiO₂ nanocomposite films in electrochromic devices. These devices demonstrated excellent response time characteristics and 螖T% value of 6 s and ca. of 70%, respectively. This work has shown that conductive polymer/NDG/TiO₂ composite electrodes are well suited to electrochromic devices for the promotion of performance and stability.