氧化鐵修飾石墨烯包裹銅粒子作為超電容電極材料之研究

Graphene-wrapped Copper Nanoparticles Decorated with Iron(III) Oxide for Supercapacitor Applications

近年來，隨著科技進步快速伴隨能源需求快速成長，儲能議題浮上檯面。在多種儲能裝置中，超級電容器因其高功率密度、使用壽命長、可用溫度範圍廣、成本低且安全穩定性高而備受矚目。本文研製了一種氧化鐵（Fe2O3）和石墨烯包裹銅納米粒子（MLG-CuNPs）的複合材料，並將其應用於超級電容器。在合成製備中，MLG-CuNPs首先透過低壓化學氣相沉積法（Low Pressure Chemical Vapor Deposition, LPCVD）合成在可撓式碳布基材上。隨後，通過連續離子層吸附及反應（Successive Ionic Layer Adsorption and Reaction, SILAR）將氧化鐵前驅物沉積在MLG-CuNPs上，緊接著於適當溫度下鍛燒獲得Fe2O3，即完成Fe2O3/MLG-CuNPs/CC複合材料電極的製備。Fe2O3修飾的MLG-CuNPs/CC電極在循環伏安(CV)曲線中表現出明顯的氧化還原電流響應和良好的比電容(1060 mF g-1)，這是由於Fe2O3優異的擬電容特性和MLG-CuNPs的高比表面積與高導電性的貢獻。

Recently, with the rapid development of science and technology and the rapid growth of energy demand, the issue of energy storage has come to the fore. Supercapacitors have attracted much attention among various energy storage devices because of their high power density, long lifetime, wide operating temperature range, low cost, and high safety and stability. In this study, a composite electrode with iron oxide (Fe2O3) and multilayer graphene-wrapped copper nanoparticles (MLG-CuNPs) is synthesized on flexible carbon cloth (CC) substrates for supercapacitor applications. Firstly, the MLG-CuNPs were synthesized on CC via low-pressure chemical vapor deposition (LPCVD) method. Thereafter, the Fe2O3 was fabricated on MLG-CuNPs by successive ionic layer adsorption and reaction (SILAR) approach. The Fe2O3-decorated MLG-CuNPs/CC electrode exhibits obvious redox current response in cyclic voltammetry (CV) measurement, and good specific capacitance 1060 mF g-1), contributed from the high pseudocapacitance of Fe2O3, as well as the high electrical conductivity and specific surface-area of MLG-CuNPs.