摘要
本研究開發出一改良化學共沉澱法來合成α相氫氧化鎳與還原石墨烯氧化物(RGO)的複合材料，以作為鎳鐵電池的電極材料。該複合材料以硝酸鎳與分散的石墨烯氧化物(GO)置於加熱迴流裝置，並維持溫度於95○C下反應。分散的GO的獲得是經由超音波震盪將石墨氧化物震盪分散於0.22 mg/ml濃度下。並採用非毒性化學物質亞硫酸氫鈉作為還原劑來轉換GO至RGO。GO與RGO上的官能基以FT-IR光譜檢測。RGO/α相氫氧化鎳的複合材料之形貌與晶體結構由XRD與SEM分析。熱失重分析(TGA)用於估算RGO於複合材料中的比重。制備出的α相氫氧化鎳經BET測試具有高比表面積達118 m2/g。初步充放電測試顯示電容量與RGO添加量有所關連，當RGO含量達15 wt%時得到最低電容量250 mAh/g，而RGO含量達8.4 wt%則有最高容量307 mAh/g。

Abstract

This work developed an improved chemical co-precipitation method for fabricating α-nickel hydroxide (α-Ni(OH)2) and reduced graphene oxide (RGO) composite materials as electrode material in Ni-Fe battery. The composite was prepared by solvothermal route at temperature 95oC by using Ni(NO3)2 and dispersed graphene oxide (dispersed GO) as precursor. The dispersed GO is prepared by sonication of GO in DI water with dispersibility of 0.22mg/ml. A non-toxic chemical of NaHSO3 was used as reducing chemical to convert GO to RGO. The functional group of GO and RGO were investigate by FT-IR technique. The morphology and crystalline structure of RGO/ α-Ni(OH)2 composites were characteristized by X-ray diffraction and SEM characteristic. Thermogravimetric analysis (TGA) is used to measure wt% of RGO in the composites. The properties of α-nickel hydroxide was prepared without GO with a high surface area of α-Ni(OH)2 about 118 m2/g by BET technique. Preliminary data on electrochemical capacity was also reported through discharge capacity and cycle number. The discharge capacity of the composites were affected significantly by the weight percentage of RGO in composites. The composites RGO/Ni(OH)2 containing 15wt% RGO is shown the lowest discharge capacities (250 mA h/g). The samples contain 8.4% wt of RGO have shown a specific discharge capacity of 307 mA h/g which is better than the other sample.

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