Graphene Oxide Nanosheet with High Proton Conductivity
Graphene Oxide Nanosheet with High Proton Conductivity
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DOI：
10.1021/ja401060q
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发表时间：
2013-06-05
影响因子：
15
通讯作者：
Hayami, Shinya
中科院分区：
文献类型：
--
作者：
Karim, Mohammad Razaul;Hatakeyama, Kazuto;Hayami, Shinya
我们首次测量了块状氧化石墨（GO '）、氧化石墨烯/质子杂化物（GO-H）和氧化石墨烯（GO）纳米片的质子电导率。GO是众所周知的电子绝缘体，但对于质子传导，我们观察到相反的趋势，因为它表现出超离子导电性。GO中存在的亲水位点作为-O-、-OH和-COOH官能团吸引质子，质子通过氢键网络沿着吸收的水膜传播。在100%湿度下，GO-1和GO-H的质子传导率分别接近10（-4）和10（-5）S cm（-1），而GO的质子传导率高得惊人，接近10（-2）S cm（-1）。这一发现表明GO基完美的二维质子导电材料在燃料电池、传感器等方面的应用是可能的。
We measured the proton conductivity of bulk graphite oxide (GO'), a graphene oxide/proton hybrid (GO-H), and a graphene oxide (GO) nanosheet for the first time. GO is well-known electronic insulator, but for proton conduction we observed the reverse trend, as it exhibited superionic conductivity. The hydrophilic sites present in GO as -O-, -OH, and -COOH functional groups attract the protons, which propagate through hydrogen-bonding networks along the absorbed water film. The proton conductivities of GO' and GO-H at 100% humidity were similar to 10(-4) and similar to 10(-5) S cm(-1), respectively, whereas that for GO was amazingly high, nearly 10(-2) S cm(-1). This finding indicates the possibility of GO-based perfect two-dimensional proton-conductive materials for applications in fuel cells, sensors, and so on.