微生物誘導鈷礦化及應用

Microbial induced precipitation of cobalt oxide for super capacitor

邱浩威(HAO-WEI CHIU)

指導教授 ： 陳建易

國立中正大學/理學院/地球與環境科學系應用地球物理與環境科學研究所/碩士(2016年)

摘要

本研究是為微生物誘導鈷沉澱，製備奈米氧化鈷之超級電容電極。所使用之細菌為Bacillus pasteurii，是一種革蘭氏陽性細菌，能夠分泌高活性之尿素水解酶，將尿素水解成氨離子與碳酸根離子，並與鈷離子反應沉澱。使用之細菌為培養四天達光吸收度1.2（OD600）的原液。首先觀察鈷離子濃度（0.01M、0.1M、1M)與細菌濃度（原液、2/3倍稀釋、1/3倍稀釋），對於碳酸鈷沉澱量之影響，並探討鍛燒溫度（400°C、550°C、700°C、850°C）對氧化鈷之結晶影響。碳酸鈷沉澱過程，以選用0.1 M鈷離子濃度與30 mL細菌溶液的配比有最高之產量（總反應器體積30 mL，命名為01BP30）。初步細菌誘導沉澱之產物於XRD圖譜上沒有峰值出現，屬無結晶相，且不同細菌量的產物於TGA圖譜上有相似之曲線分布。01BP30經過高溫鍛燒後，氧化鈷型態主要為四氧化三鈷（Co3O4），且鍛燒溫度在550°C時，於XRD圖譜上得到最高之峰值（命名為01BP30_550）。不同細菌濃度，在550°C所製備之氧化鈷，以01BP30_550材料於循環伏安法測試下，有最高之峰電流與可逆性。並於計時電位法下，電流設定為1 mA時，有最好之比電容量（163 F g-1），與最高之能量密度（2.29 Whr kg-1）。所繪製出功率密度與能量密度比較圖，匯整與前人研究之圖上，符合超級電容之性能表現。本研究成功使用一種低耗能與環境友善的微生物綠色化學方法，製備新穎及高度應用之超級電容電極。

關鍵字

微生物誘導沉澱 ； 鈷 ； 氧化鈷 ； 超級電容

並列摘要

Nano cobalt oxide was synthesized as an anode material for super capacitor electrode by a microbial induced precipitation method. The microorganism, Bacillus pasteurii, secreted high active urease which performed the hydrolysis of urea to an ammonia ion and a carbonate ion that subsequently produced precipitates with cobalt ion. The effects of concentration of cobalt ion and dilutions of bacterial broth for precipitation yield were investigated. The optimum parameters for the production yield were 0.1 M cobalt ion and original bacterial broth (named as 01BP30). XRD spectrum showed the amorphous structures for all the as-synthesized precipitations. TGA curves demonstrated the similar thermal-behavior. The effect of calcination temperature for cobalt oxide crystal using optimum 01BP30 has also been carried out. XRD of calcinated 01BP30 showed the crystal phase of Co3O4 (based on JCPDS #78-1970), and the 550°C displayed the best crystalline (named as 01BP30_550°C). 01BP30_550 showed the highest peak current and reversible in the cyclic voltammetry. It also demonstrated the highest capacitance of 163 F g-1 at 1 mA current and the highest specific energy density of 2.29 Whr kg-1 by the chronopotentiometry. My result showed a good electrochemical performance for super capacitors according to the figure of comparing specific power density and specific energy density from literature review. This study successfully achieved a novel, a low cost, an eco-friendly and a green chemistry method using microbial process for the synthesis of super capacitor.

並列關鍵字

Microbial induced precipitation ； cobalt ； cobalt oxide ； supercapacitor

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