Voltammetry of Suspensions of Polyaniline-coated Graphene Composites
Voltammetry of Suspensions of Polyaniline-coated Graphene Composites
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DOI：
10.5539/ijc.v7n21-11
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Jingyuan Chen;Xiangdong Zeng;K. Aoki;T. Nishiumi
中科院分区：
文献类型：
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作者：
Jingyuan Chen;Xiangdong Zeng;K. Aoki;T. Nishiumi
将矩形尺寸为1.0-1.5毫米的聚苯胺（PANI）-石墨烯（GN）片状颗粒分散在水溶液中，使其悬浮液稳定一天而不聚集。颗粒中 PANI 的重量分数为 75%，这与合成中 PANI 的负载分数无关。由悬浮液制成的PANI-GN薄膜形成自支撑的弹性导电薄膜。 PANI-GN 悬浮液在与吸附在电极上的 PANI 相似的电位下同时表现出还原波和氧化波，而 PANI-GO 悬浮液仅显示伏安还原波。氧化还原峰值电流由 PANI-GN 薄片的扩散控制。铸在电极上的PANI-GN薄膜显示出PANI的伏安峰，其氧化还原电荷比具有普通PANI重量的电化学聚合的PANI薄膜的氧化还原电荷大。这一事实可以通过 GN 的导电对 PANI 进行电化学彻底氧化来解释。
Flaky particles of polyaniline (PANI)-graphene (GN) with rectangular size of 1.0-1.5 mm are dispersed in aqueous solution so that their suspension is stable for one day without aggregation. The weight fraction of PANI in the particle is 75 %, which is independent of the loaded fraction of PANI in the synthesis. The PANI-GN film made of the suspension forms a self-standing, elastic, conductive film. The PANI-GN suspension exhibits both the reduction and the oxidation waves at potentials similar to those of PANI adsorbed on an electrode, whereas the PANI-GO suspension shows only the voltammetric reduction wave. The redox peak currents are controlled by diffusion of PANI-GN flakes. The PANI-GN film cast on the electrode shows voltammetric peaks for PANI, of which redox charge is larger than that of the electrochemically polymerized PANI film with the common weight of PANI. This fact can be explained in terms of the electrochemically exhaustive oxidation of PANI through the electric conduction of GN.