(哈爾濱工程大學(xué) 化工學(xué)院， 哈爾濱 150001)
摘 要: 采用低溫固相氧化還原反應(yīng)法制備出摻Cr的納米MnO2。 通過(guò)X射線衍射儀對(duì)其結(jié)構(gòu)進(jìn)行表征，結(jié)果表明：所得樣品為α-MnO2和γ-MnO2的混合晶相， 以納米MnO2作為超級(jí)電容器的電極材料的單電極活性物質(zhì)測(cè)得其比電容為95 F/g，摻入Cr的電極材料其比電容最大可達(dá)到163 F/g。循環(huán)伏安和恒流充放電測(cè)試結(jié)果表明， 化學(xué)摻雜的配比對(duì)MnO2電化學(xué)性能的影響較大。 當(dāng)Mn與Cr的摩爾比為100∶1時(shí)， 材料具有較好的放電性能， 其放電容量可提高70％。 表明化學(xué)摻雜Cr有利于提高M(jìn)nO2電極的電化學(xué)性能。
關(guān)鍵字: 超級(jí)電容器； 摻鉻二氧化錳； 改性； 固相反應(yīng)
（ School of Chemical Engineering,
Harbin Engineering University, Harbin 150001, China）
Abstract: Chromium doped Nano MnO2 were synthesized by low temperature solid-state reaction. The charactrization and performance of samples were studied by X-ray diffraction. The results show that the product is the mixture of α-MnO2 and γ-MnO2, the specific capacitances of pure MnO2 and chromium doped MnO2 are 95 F/g and 163 F/g. The results of the cyclic voltammograms and the constant current charge/discharge curves show that the ratio of chromium in samples has greater effect on the electrochemical capacity, the better discharge capacity can be obtained when the mole ratio of Mn to Cr is 100 and the discharge capacity of MnO2 electrodes is 70% higher.
Key words: supercapacitor; chromium doped manganese dioxide; modification; solid-state reaction
