Synthesis and characterization of carbon black/manganese oxide air cathodes for zinc–air batteries: Effects of the crystalline structure of manganese oxides
Synthesis and characterization of carbon black/manganese oxide air cathodes for zinc–air batteries: Effects of the crystalline structure of manganese oxides
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DOI：
10.1016/j.jpowsour.2015.08.051
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发表时间：
2015-12
影响因子：
9.2
通讯作者：
Po-Chieh Li;Chi-Chang Hu;H. Noda;H. Habazaki
中科院分区：
文献类型：
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作者：
Po-Chieh Li;Chi-Chang Hu;H. Noda;H. Habazaki
合成了α-、β-、γ-、δ- mno2相的锰氧化物（MnOx）以及Mn3O4、Mn2O3和MnOOH，系统比较了它们在锌空气电池中氧还原反应（ORR）中的电催化活性。最佳的MnOx/XC-72质量比为1，并比较了氧化物晶体结构对ORR的影响。复合材料ORR活性降低的顺序为：α-MnO2/XC-72 > γ-MnO2/XC-72 > β-MnO2/XC-72 > δ-MnO2/XC-72 > Mn2O3/XC-72 > Mn3O4/XC-72 > MnOOH/XC-72。采用扫描电镜（SEM）、透射电镜（TEM）、吸附/解吸等温线（BET）、x射线衍射（XRD）和热重分析（TGA）等方法研究了mnox2的结构特性。电化学研究包括线性扫描伏安法（LSV）、旋转环盘电极伏安法（RRDE）和全电池放电试验。锌空气电池的放电峰值功率密度从61.5 mW cm−2（α-MnO2/XC-72）到47.1 mW cm−2（Mn3O4/XC-72）不等。含α-MnO2/XC-72的空气阴极锌-空气电池在氧气氛下，当碳纸为10AA时，最大峰值功率密度为102 mW cm−2。在所有放电电流密度下，所有全电池测试的比容量均高于750毫安时g−1。
Manganese oxides (MnOx) in α-, β-, γ-, δ-MnO2phases, Mn3O4, Mn2O3, and MnOOH are synthesized for systematically comparing their electrocatalytic activity of the oxygen reduction reaction (ORR) in the Zn–air battery application. The optimal MnOx/XC-72 mass ratio for the ORR is equal to 1 and the oxide crystalline structure effect on the ORR is compared. The order of composites with respect to decreasing the ORR activity is: α-MnO2/XC-72 > γ-MnO2/XC-72 > β-MnO2/XC-72 > δ-MnO2/XC-72 > Mn2O3/XC-72 > Mn3O4/XC-72 > MnOOH/XC-72. The textural properties of MnOxare investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2adsorption/desorption isotherms with Brunauer–Emmett–Teller (BET) analysis, X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Electrochemical studies include linear sweep voltammetry (LSV), rotating ring-disk electrode (RRDE) voltammetry, and the full-cell discharge test. The discharge peak power density of Zn–air batteries varies from 61.5 mW cm−2(α-MnO2/XC-72) to 47.1 mW cm−2(Mn3O4/XC-72). The maximum peak power density is 102 mW cm−2for the Zn–air battery with an air cathode containing α-MnO2/XC-72 under an oxygen atmosphere when the carbon paper is 10AA. The specific capacity of all full-cell tests is higher than 750 mAh g−1at all discharge current densities.