Manganese hexacyanoferrate/MnO2 composite nanostructures as a cathode material for supercapacitors
Manganese hexacyanoferrate/MnO2 composite nanostructures as a cathode material for supercapacitors
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六氰基铁酸锰/MnO2复合纳米结构作为超级电容器的阴极材料
DOI：
10.1039/c2ta01354a
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Chen, Qianwang
中科院分区：
文献类型：
--
作者：
Wang, Yu;Zhong, Hao;Chen, Qianwang
采用共沉淀法和深度电氧化法制备了无定形二氧化锰包覆的六氰合铁酸锰（MnHCF）复合材料。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪和X射线光电子能谱仪对MnHCF/MnO 2复合材料的结构和成分进行了表征。电化学测试显示，在1.3 V的电压范围内，在5 mV s（-1）的扫描速率下的电容为225.6 F g（-1），在恒电流充电/放电循环期间，在0.5 A g（-1）的电流密度下的高能量密度为74.5 W h kg（-1），这上级于大多数阴极材料，包括一些报道的石墨烯/MnO 2纳米复合材料。证实了六氰合铁酸锰和二氧化锰这两种组分导致了综合的电化学行为和具有增强性能的电容器。电化学测试和相应的XPS分析也表明，锰通过MnHCF中的氮原子与氰化物基团配位，在电位循环期间不参与电荷存储过程。
A composite of manganese hexacyanoferrate (MnHCF) coated by an amorphous manganese dioxide layer was synthesized by a facile co-precipitation method and a further step called "deep electro-oxidation". The structure and components of the resulting MnHCF/MnO2 composites were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. Electrochemical testing showed a capacitance of 225.6 F g(-1) at a sweep rate of 5 mV s(-1) within a voltage range of 1.3 V and a high energy density of 74.5 W h kg(-1) at a current density of 0.5 A g(-1) during galvanostatic charge/discharge cycles, which is superior to most cathode materials, including some reported graphene/MnO2 nanocomposites. It is confirmed that the two components, manganese hexacyanoferrate and manganese dioxide, lead to an integrated electrochemical behavior and a capacitor with enhanced performance. The electrochemical testing and corresponding XPS analysis also demonstrated that the manganese coordinated by cyanide groups via nitrogen atoms in MnHCF did not get involved in the charge storage process during potential cycles.