裂開球形氧化鎳氧化銅復合氧化物的簡單制備及其超級電容器性能（英文）

2014-11-14 15:54:46鐘劍劍劉開宇蘇耿等

湖南師范大學學報·自然科學版 2014年5期

鐘劍劍　劉開宇++蘇耿　等

摘要通過液相共沉淀法及高溫熱解法制備了裂開球形氧化鎳氧化銅復合物.采用了X射線衍射光譜（XRD）、掃描電子顯微鏡（SEM）及透射電子顯微鏡（TEM）表征了該材料的結(jié)構(gòu).采用恒流充放電法研究了制備的NiOCuO復合物在6 mol·L-1 KOH溶液中的電化學行為.實驗結(jié)果表明：這種裂開球形復合氧化物由氧化鎳、氧化銅組成.該材料在1 A·g-1 的電流密度下所得復合氧化物單電級比電容為735 F·g-1，并且在580次充放電循環(huán)后，容量保持率為98%，遠遠高于氧化鎳（351 F·g-1）和氧化銅（262 F·g-1）的比容量.

關鍵詞NiOCuO 復合物；超級電容器；開口球形；比電容

Because of global warming issues and the consumption of fossil fuels， numerous efforts have been made to develop renewable energies， as well as electric vehicles （EVs） or hybridelectric vehicles （HEVs） with low CO2 emission. The exploitation of other energy conversion storage resources with high power and large energy is very important[12]. Among them， supercapacitors， have been extensively applied in many fields， ranging from portable consumer electronics and computer memory backup systems， to hybrid electric vehicles （HEVs） and EVs， due to their pulse power supply and long cycle life[12]. Supercapacitors， which are also known as electrochemical capacitors and are divided into electrical doublelayer capacitors and pseudocapacitors according to the chargestorage mechanism， have drawn worldwide research attention as the most promising candidate for nextgeneration highcapacitance energy storage devices[14]. EDLCs store energy based on charge separation at the electrodeelectrolyte interface， while pseudocapacitors rely on fast and reversible redox reactions occurring on the surfaces of the active materials. Supercapacitors made of metal oxides bearing pseudocapacitance attract much interest due to fast and reversible surface redox reactions （faradaic reactions）. Various transition metal oxides， such as RuO2[5]， Co3O4[6]， Fe2O3[7]， MnO2[8]， MoO2[9]， CuO[10] are being studied for the supercapacitor applications. Hydrous ruthenium oxides have high specific capacitance and excellent reversibility. However， the high cost and toxic nature of RuO2 limit its applications. The best alternative materials are other metal oxides such as MnO2， Fe3O4 and V2O5[11]， whose main unresolved issues include poor electrical conductivity and low electrochemical cycle ability. Hence， the work of finding alternative cheap and environmentally friendly metal oxide materials attach much importance to the development of supercapacitors.

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