Rechargeable PEM Fuel-Cell Batteries Using Porous Carbon Modified with Carbonyl Groups as Anode Materials
Rechargeable PEM Fuel-Cell Batteries Using Porous Carbon Modified with Carbonyl Groups as Anode Materials
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DOI：
10.1149/2.0581508jes
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发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Hibino, Takashi
中科院分区：
文献类型：
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作者：
Kobayashi, Kazuyo;Nagao, Masahiro;Hibino, Takashi
可充电燃料电池（RFCB）通过在阳极储存和释放氢来运行，而在阴极发生析氧和还原反应。用硝酸处理高比表面积多孔碳以产生在表面上具有羰基和酚基团的阳极材料，从而提供用于氢存储和释放的氧化还原位点。HNO 3-活性炭阳极的特征在于用于在0- 2.0V的电压范围内从室温至75 ℃操作的RFCB中。羰基和相应的还原酚基的量随着氧化碳的O/C原子比而增加，由此，在O/C原子比为0.114时，电容量增加到最大值125 mAh g（-1）。性能和可循环性的最佳温度和充电电压分别确定为50 ℃和1.25 V。充电和放电时间保持在约。300次循环后各自初始值的93%。具有改性多孔碳阳极的RFCB提供2.5- 13.8Wh kg（-1）的能量密度和46.4- 296.3W kg（-1）的功率密度（根据整个电池的质量归一化）。(C)作者（S）2015由ECS发布。All rights reserved.
Rechargeable fuel-cell batteries (RFCBs) operate by hydrogen storage and release at the anode, while oxygen evolution and reduction reactions occur at the cathode. High-surface-area porous carbon was treated with HNO3 to produce an anode material with carbonyl and phenol groups on the surface, thereby providing redox sites for hydrogen storage and release. The HNO3-activated carbon anodes were characterized with respect to use in a RFCB operated from room temperature to 75 degrees C with a voltage range of 0-2.0 V. The quantity of carbonyl groups and the corresponding reduced phenol groups increased with the O/C atomic ratio of the oxygenated carbon, by which the electrical capacity was increased to reach a maximum of 125 mAh g(-1) at an O/C atomic ratio of 0.114. The optimal temperature and charge voltage for performance and cyclability were determined to be 50 degrees C and 1.25 V, respectively. The charge and discharge times remained at ca. 93% of the respective initial values after 300 cycles. The RFCB with the modified porous carbon anode provided energy densities of 2.5-13.8 Wh kg(-1) and power densities of 46.4-296.3 W kg(-1) (normalized according to the mass of the entire cell). (C) The Author(s) 2015. Published by ECS. All rights reserved.