Facile synthesis of α-MnO2 nanorods for high-performance alkaline batteries
Facile synthesis of α-MnO2 nanorods for high-performance alkaline batteries
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DOI：
10.1016/j.jpcs.2009.11.016
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发表时间：
2010-03
影响因子：
4
通讯作者：
Nianfa Tang;Xike Tian;Chao Yang;Zhenbang Pi;Qing Han
中科院分区：
文献类型：
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作者：
Nianfa Tang;Xike Tian;Chao Yang;Zhenbang Pi;Qing Han
基于高锰酸根阴离子MnO4-和H2O在含有KMnO4和HNO3的混合物中的氧化还原反应，通过一种新型水热方法成功合成了单晶α-MnO2纳米棒。产品通过粉末X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）和Brunauer-Emmett-Teller（BET）进行了表征。结果表明，表面积为∼95.2m2g−1的α-MnO2纳米棒晶粒尺寸均匀，直径范围为10~20nm。材料的电化学性能表明，与商业电解二氧化锰（EMD）相比，所制备的α-MnO2纳米棒在50、250和500mAg−1不同恒流电流下的放电容量分别提高了70.4%、104.1%和135.7%。
Single-crystalline α-MnO2nanorods have been successfully synthesized by a novel hydrothermal method based on the redox reactions between the permanganate anion MnO4–and H2O in mixture containing KMnO4and HNO3. The products have been characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and Brunauer–Emmett–Teller (BET). The results prove that the grain size of α-MnO2nanorods with the surface area ∼95.2m2g−1is homogeneous with diameters ranging from 10 to 20nm. The electrochemical property of the material shows that compared with the commercial electrolytic manganese dioxide (EMD), the discharge capacity of the as-prepared α-MnO2nanorods is increased by 70.4%, 104.1% and 135.7% at different constant currents of 50, 250 and 500mAg−1, respectively.