MnO2 nanorod catalysts for magnesium–air fuel cells: Influence of different supports
MnO2 nanorod catalysts for magnesium–air fuel cells: Influence of different supports
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用于镁空气燃料电池的MnO2纳米棒催化剂：不同载体的影响
DOI：
10.1016/j.ijhydene.2015.03.140
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发表时间：
2015-06
影响因子：
7.2
通讯作者：
Yuxin Wang
中科院分区：
文献类型：
--
作者：
Panfeng Yue;Zhongfang Li;Suwen Wang;Yuxin Wang
采用水热法制备了不同载体（非载体、炭黑和MWCNTs）吸附的mno2纳米棒，用于镁空气燃料电池（MAFCs）。催化剂的形态特征表明，纳米棒和MWCNTs的结合方式为平行、交叉和弯曲相交，提供了较大的表面积，增强了电子传递过程。x射线衍射图显示MnO2的晶体形态，x射线光电子能谱显示锰的存在形态为Mn4+。利用旋转圆盘电极对ORR性能进行了研究，结果表明，与Hg/HgO相比，MnO2/C和MnO2/MWCNTs在LSV曲线上的初始还原电位分别为- 0.02和0.03 V（与NHE相比为+0.098 V）。MnO2/MWCNTs的电子转移数为3.86，对应4个电子。结果表明，60 h后，MnO2/MWCNTs的氧还原电流密度下降了18.1%，MnO2/C的氧还原电流密度下降了27.9%。扫描5000次后，MnO2/MWCNTs和MnO2/C的电流密度损失分别为0.4和0.8 mA cm−2。负载MnO2/C和MnO2/MWCNTs催化剂的空气电极在150 mA cm−2下的电位值分别为- 0.78 V和- 0.62 V。单腔mac的放电性能表明，在10 wt% NaCl溶液中，MnO2/C和MnO2/MWCNTs在20℃下的峰值功率密度分别为60.95和70.47 mW cm−2。MnO2/MWCNTs单电池可在20 mA cm−2的电流密度下连续放电24 h以上。EIS结果表明，MnO2/MWCNTs的电导率高于MnO2/C。
MnO2nanorods adsorbed with different supports (non-support, carbon black, and MWCNTs) were prepared through hydrothermal method for magnesium–air fuel cells (MAFCs). The morphological characteristics of the catalysts indicate that the combination modes of nanorods and MWCNTs are parallel, cross, and bend intersect, which provide a large surface areas and enhance electron transfer process. X-ray diffraction pattern illustrates the crystal form of MnO2, and X-ray photoelectron spectroscopy reveals that the existing form of manganese is Mn4+. The ORR performance investigated using a rotating disk electrode shows that the initial reduction potential of MnO2/C and MnO2/MWCNTs in the LSV curves are −0.02 and 0.03 V vs. Hg/HgO (+0.098 V vs. NHE), respectively. The electron transfer number of MnO2/MWCNTs is 3.86, which corresponds to four electrons. In theI–tcurves, the oxygen reduction current density of MnO2/MWCNTs decreases by 18.1% and MnO2/C decays by 27.9% after 60 h. The CVs reveal that the current density losses of MnO2/MWCNTs and MnO2/C are 0.4 and 0.8 mA cm−2after scanning for 5000 cycles. The potential values of the air electrode loaded with MnO2/C and MnO2/MWCNTs catalysts are −0.78 and −0.62 V vs. SCE, respectively, at 150 mA cm−2, respectively. The discharge performance of a single-chamber MAFC shows that the peak power densities of MnO2/C and MnO2/MWCNTs are 60.95 and 70.47 mW cm−2, respectively, 20 °C in 10 wt% NaCl solutions. The single cells of MnO2/MWCNTs can continuously discharge for more than 24 h at a current density of 20 mA cm−2. The EIS proves that the conductivity of MnO2/MWCNTs is higher than MnO2/C.
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影响因子：
3
作者：
Zhuangjun Fan;Zhongwei Qie;Tong Wei;Jun Yan;Shanshan Wang
通讯作者：
Zhuangjun Fan;Zhongwei Qie;Tong Wei;Jun Yan;Shanshan Wang
影响因子：
9.2
作者：
Narah Ominde;Nicholas W. Bartlett;Xiao‐Qing Yang;D. Qu
通讯作者：
Narah Ominde;Nicholas W. Bartlett;Xiao‐Qing Yang;D. Qu
影响因子：
3.7
作者：
Liang, Shuhui;Bulgan, Fei Teng G.;Zhu, Yongfa
通讯作者：
Zhu, Yongfa
影响因子：
3
作者：
Sun, Ming;Lan, Bang;Zheng, Yuying
通讯作者：
Zheng, Yuying
影响因子：
4
作者：
Nianfa Tang;Xike Tian;Chao Yang;Zhenbang Pi;Qing Han
通讯作者：
Nianfa Tang;Xike Tian;Chao Yang;Zhenbang Pi;Qing Han