【摘要】：直接甲酸燃料電池(DFAFCs)是一種很有前景的可用于移動(dòng)電子設(shè)備的電源.鈀對(duì)甲酸電催化氧化有很高的活性,但穩(wěn)定性較差,容易失活;鉑對(duì)甲酸電催化氧化的活性低于鈀,但穩(wěn)定性好.前期研究表明,高指數(shù)晶面鉑納米粒子對(duì)甲酸的電催化氧化活性顯著高于低指數(shù)晶面鉑納米粒子.本文以碳紙為載體,應(yīng)用方波電位法生長(zhǎng)高指數(shù)晶面鉑納米粒子(HIF-Pt/C-paper),通過改變方波上下限電位,合成出不同粒徑的二十四面體和偏方三八面體鉑納米粒子.進(jìn)一步在碳紙上修飾一層碳黑微孔層并優(yōu)化電沉積條件,制備出粒徑約10 nm,載量0.069 mg·cm~(-2)的HIF-Pt/C-paper作為DFAFCs的陽極催化劑.在甲酸濃度為3 mol·L~(-1)時(shí),測(cè)得30oC下單電池最大功率密度10.6 m W·cm~(-2),最大質(zhì)量功率密度153.5 m W·mg~(-1)Pt,是以1 mg·cm~(-2)載量的商業(yè)60%(by mass)Pt/C(簡(jiǎn)稱商業(yè)Pt/C)為陽極催化劑的電池的8.4倍.HIF-Pt/C-paper陽極DFAFCs在20 m A·cm~(-2)條件下運(yùn)行50 h,電壓保持率為95%,顯示出很好的穩(wěn)定性.
[Abstract]:Direct formic acid fuel cell (DFAFCs) is a promising power source for mobile electronic devices. Palladium has a high activity for formic acid electrooxidation, but its stability is poor and it is easy to deactivate, while platinum has lower activity for formic acid electrooxidation than palladium, but has good stability. Previous studies showed that the electrocatalytic oxidation activity of high index platinum nanoparticles for formic acid was significantly higher than that of low index platinum nanoparticles. In this paper, high exponent platinum nanoparticles (HIF-Pt/C-paper) were grown on carbon paper by square wave potential method. 24 and partial trioctahedron platinum nanoparticles with different diameters were synthesized by changing the upper and lower potential of square wave. Furthermore, a layer of carbon black microporous layer was modified on carbon paper and the electrodeposition conditions were optimized to prepare HIF-Pt/C-paper with a particle size of about 10 nm, (0.069 mg cm~ (-2) as anodic catalyst for DFAFCs. When formic acid concentration was 3 mol L ~ (-1), the maximum power density of 30oC was 10.6 MW cm~ (-2) and the maximum mass power density was 153.5 MW mg~ (-1) Pt,. It is 8.4 times as high as that of the battery with 1 mg cm~ (-2) of commercial 60% (by mass) Pt/C (abbreviated as commercial Pt/C) as anode catalyst. HIF-Pt/C-paper anodic DFAFCs is operated at 20 Ma cm~ (-2) for 50 h. The voltage retention rate is 95, showing good stability.
【作者單位】： 廈門大學(xué)固體表面物理化學(xué)國家重點(diǎn)實(shí)驗(yàn)室化學(xué)化工學(xué)院;中國科學(xué)院上海高等研究院;
【基金】：國家自然科學(xué)基金創(chuàng)新研究群體項(xiàng)目(No.21321061);國家自然科學(xué)基金(海外及港澳學(xué)者合作研究基金)延續(xù)資助項(xiàng)目(No.21229301) 國家自然科學(xué)基金委員會(huì)-國際純粹與應(yīng)用化學(xué)聯(lián)合會(huì)(國際(地區(qū))合作與交流項(xiàng)目)(No.21361140374)資助
【分類號(hào)】：O643.36;TM911.4

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1 王成名;高指數(shù)晶面金屬納米結(jié)構(gòu)的可控合成及電催化性能研究[D];中國科學(xué)技術(shù)大學(xué);2013年

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