Fibrous MnO_2 electrode electrodeposited on carbon fiber for a fuel cell/battery system
Fibrous MnO_2 electrode electrodeposited on carbon fiber for a fuel cell/battery system
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用于燃料电池/电池系统的碳纤维上电沉积纤维状 MnO_2 电极
DOI：
10.1016/j.electacta.2011.05.057
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发表时间：
2011
影响因子：
6.6
通讯作者：
Bokkyu Choi
中科院分区：
文献类型：
--
作者：
坂巻純一;深水昭吉;小田隆史;小田隆史;小田隆史;小田隆史;Bokkyu Choi
采用电沉积法在碳纤维上制备了一种新型纤维状MnO 2燃料电池电极。通过交流阻抗、恒电流和循环伏安等测试手段研究了纤维状MnO 2电极的电化学性能。实验结果表明，纤维状MnO 2电极是上级的糊电极，因为以下：（i）MnO 2和导电材料之间的更好的接触;（ii）高的电荷转移速率，因为比传统的电沉积MnO 2颗粒的直径更小（因此，预计比表面积将更高）;和（iii）低的过电位。用扫描电镜和X射线衍射分别对纤维状MnO 2电极的形貌和晶体结构进行了研究。在0.01Adm− 2电流密度下电沉积2 h后，发现碳纤维的整个表面都被γ-MnO 2覆盖。
A novel fibrous MnO2electrode for a fuel cell/battery system is fabricated on carbon fiber by the electrodeposition method. The characteristics of the fibrous MnO2electrode are examined by electrochemical impedance spectra, galvanostatic performance and cyclic voltammetry. The experimental results indicate that the fibrous MnO2electrodes are superior to pasted electrodes because of the following: (i) better contact between MnO2and the electrical conducting material; (ii) high charge-transfer rate because of a smaller diameter than conventional electrodeposited MnO2particles (thus it is expected that the specific surface area would be higher); and (iii) a low overpotential. The morphology and the crystal structure of the fibrous MnO2electrode are investigated by scanning electron microscopy and X-ray diffraction, respectively. The entire surface of the carbon fiber is found to be coated with γ-MnO2after 2h of electrodeposition at 0.01Adm−2current density.