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Graphene Oxide Membranes with Cerium-Enhanced Proton Conductivity for Water Vapor Electrolysis
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-03-30 , DOI: 10.1021/acsanm.0c00439 Nur Laila Hamidah 1, 2 , Masataka Shintani 3 , Aynul Sakinah Ahmad Fauzi 3 , Ghina Kifayah Putri 2 , Shota Kitamura 1 , Kazuto Hatakeyama 4 , Mitsuru Sasaki 5 , Armando T. Quitain 6 , Tetsuya Kida 7
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-03-30 , DOI: 10.1021/acsanm.0c00439 Nur Laila Hamidah 1, 2 , Masataka Shintani 3 , Aynul Sakinah Ahmad Fauzi 3 , Ghina Kifayah Putri 2 , Shota Kitamura 1 , Kazuto Hatakeyama 4 , Mitsuru Sasaki 5 , Armando T. Quitain 6 , Tetsuya Kida 7
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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 μm) 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 °C. Our results demonstrate the promising capability of carbon-based membranes for electrochemical energy devices.
中文翻译：
铈增强质子电导率的氧化石墨烯膜用于水蒸气电解
氧化石墨烯（GO）中的质子传导可用于多种电化学应用。这项研究的重点是堆叠式GO纳米片膜在水蒸气电解中的应用。发现在Tour方法中使用膨胀石墨有效地生产了具有较高氧化态（62at。％）且合成时间缩短的GO纳米片。通过将高度氧化的纳米片与Ce离子偶联，可以大大增加膜的层间距。Ce改性的自立式GO膜（260μm）在水中具有改善的稳定性，并且在室温下具有与Nafion相当的高质子传导率。铈辅助层间间距的扩大，质子扩散得到了显着改善。还讨论了与GO纳米片相互作用的Ce离子的独特特征。浓缩池测量表明，Ce改性膜在室温下为纯质子导体。夹有IrO的Ce改性膜2- Al 2 O 3阳极和Pt / C阴极在室温和40°C下以2：1的比例有效地将水蒸气转化为氢和氧。我们的结果证明了碳基膜用于电化学能源设备的有前途的能力。
更新日期：2020-03-30
中文翻译：
铈增强质子电导率的氧化石墨烯膜用于水蒸气电解
氧化石墨烯（GO）中的质子传导可用于多种电化学应用。这项研究的重点是堆叠式GO纳米片膜在水蒸气电解中的应用。发现在Tour方法中使用膨胀石墨有效地生产了具有较高氧化态（62at。％）且合成时间缩短的GO纳米片。通过将高度氧化的纳米片与Ce离子偶联，可以大大增加膜的层间距。Ce改性的自立式GO膜（260μm）在水中具有改善的稳定性，并且在室温下具有与Nafion相当的高质子传导率。铈辅助层间间距的扩大，质子扩散得到了显着改善。还讨论了与GO纳米片相互作用的Ce离子的独特特征。浓缩池测量表明，Ce改性膜在室温下为纯质子导体。夹有IrO的Ce改性膜2- Al 2 O 3阳极和Pt / C阴极在室温和40°C下以2：1的比例有效地将水蒸气转化为氢和氧。我们的结果证明了碳基膜用于电化学能源设备的有前途的能力。
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