Graphene Oxide Membranes with Cerium-Enhanced Proton Conductivity for Water Vapor Electrolysis
Graphene Oxide Membranes with Cerium-Enhanced Proton Conductivity for Water Vapor Electrolysis
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DOI：
10.1021/acsanm.0c00439
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发表时间：
2020-05-22
影响因子：
5.9
通讯作者：
Tetsuya, Kida
中科院分区：
文献类型：
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作者：
Hamidah, Nur Laila;Shintani, Masataka;Tetsuya, Kida
氧化石墨烯（GO）中的质子传导允许各种电化学应用。本研究的重点是堆叠的GO纳米片膜用于水蒸气电解的应用。发现在Tour方法中使用膨胀石墨有效地产生具有较高氧化态（62 at. %），缩短了合成时间。通过将高度氧化的纳米片与Ce离子偶联，膜的层间距显著增加。Ce改性的自立式GO膜（260 μ m）显示出在水中的改进的稳定性和在室温下与Nafion相当的高质子传导率。在质子扩散的显着改善是通过铈辅助的层间距的扩展。还讨论了与GO纳米片相互作用的Ce离子的独特特征。浓差电池测量表明，铈改性膜是一个纯质子导体在室温下。在室温和40 ℃下，夹有IrO 2-Al 2 O3阳极和Pt/C阴极的Ce改性膜有效地将水蒸气以2：1的比例转化为氢气和氧气。我们的研究结果表明，碳基膜的电化学能源设备的有前途的能力。
Proton conduction in graphene oxide (GO) allows for a variety of electrochemical applications. This study focuses on the application of a stacked GO nanosheet membrane for water vapor electrolysis. It was found that the use of expanded graphite in the Tour method effectively produced GO nanosheets having a higher oxidation state (62 at. %) with a shortened synthesis time. The interlayer spacing of a membrane was considerably increased by coupling the highly oxidized nanosheets with Ce ions. The Ce-modified self-standing GO membrane (260 mu m) showed an improved stability in water and a high proton conductivity comparable to that of Nafion at room temperature. The remarkable improvement in proton diffusion was attained by the Ce-assisted expansion of the interlayer spacing. The unique features of the Ce ions that interact with GO nanosheets were also discussed. Concentration cell measurements indicated that the Ce-modified membrane is a pure proton conductor at room temperature. The Ce-modified membrane sandwiched with the IrO2-Al2O3 anode and Pt/C cathode efficiently converted water vapor to hydrogen and oxygen in a 2:1 ratio at room temperature and 40 degrees C. Our results demonstrate the promising capability of carbon-based membranes for electrochemical energy devices.