本文選題：雙金屬納米材料 + 碳纖維紙��； 參考：《福建師范大學(xué)》2015年碩士論文

【摘要】：雙金屬納米材料具有卓越的催化活性及穩(wěn)定性,近年來在電解水析氫方向得到了廣泛關(guān)注。目前雙金屬催化電極的制備工藝成本高昂且非環(huán)境友好,限制了其大規(guī)�；瘧�(yīng)用。本研究從綠色化工角度出發(fā),利用福建省本土速生植物桉樹樹葉作為制備催化電極的還原劑及保護劑,結(jié)合以浸漬方式為主的靜電自組裝技術(shù),發(fā)展了一種操作簡易、綠色環(huán)保的新型制備工藝,成功將雙金屬納米顆粒負(fù)載到具有三維復(fù)雜結(jié)構(gòu)的基底上,制備得到碳纖維紙負(fù)載納米鈀金電極,同時實現(xiàn)了對催化劑組成及結(jié)構(gòu)的精準(zhǔn)調(diào)控。通過掃描電鏡、X射線能譜、掃描透射電鏡、X射線光電子能譜等物理表征方法發(fā)現(xiàn),制備得到的納米顆粒形貌統(tǒng)一,為近球形,平均粒徑在180 nm左右,均勻分散在碳纖維表面,催化劑負(fù)載量約為0.5 mg/cm2;納米顆粒中鈀金的摩爾比例基本接近前驅(qū)體比例,原子排列方式為混合式,具有完整的晶體結(jié)構(gòu)和高結(jié)晶度。通過極化曲線、計時電流、電化學(xué)阻抗譜和雙電層電容分析等電化學(xué)測試手段發(fā)現(xiàn),負(fù)載型納米鈀金電極表現(xiàn)出優(yōu)異的催化析氫活性,具有較低的塔菲爾斜率(47 mV/dec)和較高的交換電流密度(0.256 mA/cm2);此外,電極具有良好的穩(wěn)定性,在高工作強度和長時間尺度的催化反應(yīng)后,析氫活性保持基本不變。在實驗室小試的基礎(chǔ)上,根據(jù)工藝特性和產(chǎn)品質(zhì)量要求,合理設(shè)計了制備500×500mm2碳纖維紙負(fù)載納米鈀金電極的中試生產(chǎn)方案,并完成了工藝設(shè)備選型、車間平面設(shè)計及經(jīng)濟效益可行性分析,為下一步準(zhǔn)備中試生產(chǎn)催化電極做出了初步的設(shè)計構(gòu)想。該新型制備工藝的發(fā)展不僅為制備電解水析氫電極提供了一個高效環(huán)保的新方法,也為其他電化學(xué)催化設(shè)備的建構(gòu)提供了新思路。
[Abstract]:Bimetallic nanomaterials with excellent catalytic activity and stability have attracted wide attention in the direction of hydrogen evolution in electrolytic water in recent years. The large scale application of bimetallic catalytic electrode is limited due to its high cost and non-environmental friendliness. From the point of view of green chemical industry, using the leaves of native fast growing eucalyptus in Fujian Province as reducing agent and protective agent for preparing catalytic electrode, and combining with electrostatic self-assembly technology with impregnation method, a simple and easy operation was developed. The novel green preparation technology successfully loaded bimetallic nanoparticles onto the substrates with three dimensional complex structure and prepared carbon fiber paper loaded nano-palladium gold electrode. At the same time the precise control of the composition and structure of the catalyst was realized. By means of SEM X-ray spectroscopy, SEM X-ray photoelectron spectroscopy and other physical characterization methods, it was found that the morphology of the prepared nanoparticles was uniform, nearly spherical, the average particle size was about 180 nm, and the nanoparticles were uniformly dispersed on the surface of carbon fiber. The amount of catalyst supported is about 0.5 mg / cm ~ 2. The molar ratio of palladium and gold in the nanoparticles is close to that of the precursor, and the atom arrangement is mixed, with complete crystal structure and high crystallinity. By means of polarization curve, chronoelectric current, electrochemical impedance spectroscopy and double layer capacitance analysis, it was found that the supported nanocrystalline palladium gold electrode showed excellent catalytic hydrogen evolution activity. The electrode has a low Taffel slope of 47 MV / cm ~ (2) and a high exchange current density of 0.256 Ma / cm ~ (2). In addition, the electrode has good stability, and the activity of hydrogen evolution remains basically unchanged after high working intensity and long time scale catalytic reaction. On the basis of laboratory test, according to the process characteristics and product quality requirements, the pilot production scheme of preparing 500 脳 500mm2 carbon fiber paper loaded nano-palladium gold electrode was designed, and the selection of process equipment was completed. The plane design of workshop and the feasibility analysis of economic benefit are discussed, and a preliminary design conception is made for the pilot-scale production of catalytic electrode. The development of the new preparation process not only provides a new method of high efficiency and environmental protection for the preparation of electrolytic hydrogen evolution electrode, but also provides a new idea for the construction of other electrochemical catalytic equipment.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ116.2;TB383.1

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