水热法合成锌空气电池氧还原二氧化锰催化剂(英文)

Preparation of Manganese Dioxide for Oxygen Reduction in Zinc Air Battery by Hydro thermal Method

在180℃下通过改变K+与H+摩尔比使用水热法分别制备了δ-MnO2,α-MnO2和β-MnO2纳米颗粒,K+与H+摩尔比分别为3.4、0.85和0.24。所合成的样品通过扫描电子显微镜(SEM),粉末X射线衍射(XRD),傅里叶变换红外光谱(FTIR),BET比表面分析,热重分析(TG)和电化学方法表征。结果表明:K+与H+的浓度对产品的晶型、形貌以及比表面积有很大影响;将这三种材料作为锌空电池的阴极材料时,δ-MnO2与α-MnO2的电化学性能明显优于β-MnO2.在–0.35 V下,δ-MnO2、α-MnO2和β-MnO2的氧还原电流分别为56.28、56.01和40.88 mA/cm2。

δ-MnO2,α-MnO2 and β-MnO2 nano-particles were obtained by a hydrothermal method with changing molar ratios of K＋/H＋ at low temperature of 180℃, and the molar ratios of K/H＋ were 3.4, 0.85 and 0.24, respectively. The as-prepared samples were characterized by SEM, XRD, FTIR, BET, TG and electrochemical method. The results indicate that the concentrations of K＋ ion and H＋ ion have great effects on the crystalline structures, morphology and specific surface area of the as-prepared products. Among the three as-prepared samples used as cathodic materials in zinc air battery, the rate performances of the δ-MnO2 and α-MnO2 are superior to that of the as-prepared β-MnO2. The oxygen re- duction currents of β-MnO2.在-0.35 V下,δ-MnO2、α-MnO2 and β-MnO2 respectively.