本文選題：微生物燃料電池 + 碳納米管　； 參考：《揚(yáng)州大學(xué)》2014年碩士論文

【摘要】：本文首先選取碳?xì)?CF)作為制備復(fù)合陽極材料的基體,利用化學(xué)氣相沉積法(CVD)在碳纖維表面原位生長碳納米管(CNTs),并以此作為主體材料,之后均在此基礎(chǔ)之上進(jìn)一步改性。實驗所制備改性復(fù)合材料的表征分析包括掃描電子顯微鏡(SEM)、X射線衍射(XRD)、能量色散X射線(EDX)和傅里葉變換紅外光譜(FTIR),運(yùn)用循環(huán)伏安法(CV)和電化學(xué)阻抗法(EIS)對其電化學(xué)性能進(jìn)行測試和分析,并研究改性材料應(yīng)用于微生物燃料電池(MFC)陽極的產(chǎn)電特性。MFC外電路連接2500Ω電阻,數(shù)據(jù)采集器的采集頻率設(shè)置為1000 Hz,陽極室有效容積約120 mL,陽極和陰極電極的有效表面積分別為25 cm2和45 cm2,陰極液為50mmol·L-1 K3[Fe(CN)6] (pH=7)磷酸鹽緩沖體系。通過對不同溫度和濃度下的COD去除率分析,確定裝置最佳運(yùn)行條件為：pH=7、溫度38℃和陽極初始COD濃度約1500 mg·L-1。另外,由于MFC連續(xù)運(yùn)行一星期后其產(chǎn)電水平和基質(zhì)濃度會大幅下降,并且穩(wěn)定在一個很低的值。因此,為了恢復(fù)微生物活性和產(chǎn)電能力,設(shè)定7天更換一次營養(yǎng)液,研究在一個微生物間歇周期內(nèi)的MFC產(chǎn)電性能。本實驗針對主體材料總共制備了5種改性電極,其中涉及的方法包括聚乙烯醇(PVA)開口修飾處理、配制納米級ZnO和納米級Sn02溶膠分別進(jìn)行負(fù)載以及原位聚合聚苯胺(PANI)添加與不添加石墨烯(G)。在產(chǎn)電特性和電化學(xué)性能上,改性電極相比主體材料均有不同程度的提高,其中石墨烯/聚苯胺復(fù)合電極的產(chǎn)電功率密度最高,可達(dá)165.89mW·m-2,表觀內(nèi)阻最小僅206Ω,最高電壓0.687 V,平均電壓0.4 V, COD去除率近81%,庫倫效率約5.7%。其循環(huán)伏安測試也表現(xiàn)出良好的導(dǎo)電性和一定的氧化還原性能,根據(jù)電化學(xué)阻抗測試得到的奈奎斯特曲線選擇相應(yīng)的等效電路進(jìn)行擬合分析,其歐姆內(nèi)阻僅2.5Ω,電荷轉(zhuǎn)移電阻18.9Ω,同時石墨烯能增強(qiáng)復(fù)合電極的電容性,此外,其它復(fù)合電極也體現(xiàn)出較好的綜合特性�？傮w分析得出,改性之后的電極具有較大的比表面積、界面面積和導(dǎo)電性,可提供較多微生物附著生長所需要的空間位點,較低的內(nèi)阻使得電子轉(zhuǎn)移效率得到提高,除此之外,改性電極與微生物之間具有良好的相容性,有利于增加陽極表面產(chǎn)電微生物數(shù)量,釋放出更多的電子,從而進(jìn)一步提高M(jìn)FC產(chǎn)電性能。
[Abstract]:Carbon felt (CF) was first selected as the matrix for preparing composite anode materials. Carbon nanotubes (CNTs) were grown on carbon fiber surface by chemical vapor deposition (CVD). Carbon nanotubes (CNTs) were used as the main materials, which were further modified on the basis of chemical vapor deposition (CVD). The characterization and analysis of the modified composite materials prepared by the experiment include scanning electron microscope (SEM) X-ray diffraction (XRD), energy dispersive X-ray (edX) and Fourier transform infrared spectroscopy (FTIR). The electrochemical properties of the composites were characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). To test and analyze their academic performance, The electrical characteristics of the anode used in the microbial fuel cell (MFC) were studied. The external circuit of MFC was connected with 2500 惟 resistor. The acquisition frequency of the data collector is 1000 Hz, the effective volume of anode chamber is about 120mL, the effective surface area of anode and cathode electrode is 25 cm2 and 45 cm ~ 2, respectively, and the cathode solution is 50mmol L-1 K _ 3 [Fe (CN) _ 6] (pH ~ (7) phosphate buffer system. Through the analysis of COD removal rate at different temperature and concentration, the optimum operating conditions were determined as follows: 1: pH7, 38 鈩，

本文編號：2079207