發(fā)布時(shí)間：2018-09-06 19:46

【摘要】：為提高質(zhì)子交換膜燃料電池(PEMFC)電催化劑的催化活性,并降低其成本,利用循環(huán)伏安法電沉積制備Pt-Fe合金催化劑,并以其作為PEMFC陰極。通過(guò)X射線衍射儀(XRD)、循環(huán)伏安法(CV)、能譜儀(EDS)、掃描電子顯微鏡(SEM)測(cè)試技術(shù)對(duì)催化劑樣品進(jìn)行性能表征。通過(guò)循環(huán)伏安線性掃描法確定Pt-Fe合金的沉積電位,并探究了電沉積過(guò)程中電解液溫度、電位和掃描速率對(duì)催化劑樣品形貌以及電催化性能的影響。結(jié)果表明:電解液溫度主要對(duì)催化劑沉積量及分散性起作用,對(duì)形貌影響不大,掃描速率主要對(duì)晶體生長(zhǎng)產(chǎn)生影響;電位掃描范圍為-0.4~0.6 V、掃描速率為100 m V/s,電解液溫度為50℃時(shí),電沉積得到的Pt-Fe合金催化劑的顆粒在碳布表面呈空心球狀且分散均勻,與其他沉積電位制得的樣品相比較,合金中Pt/Fe原子比相對(duì)較高,其具有最大的電化學(xué)活性表面積,為64.30 m2/g,電催化活性最佳。
[Abstract]:In order to improve the catalytic activity and reduce the cost of proton exchange membrane fuel cell (PEM) (PEMFC) electrocatalysts, Pt-Fe alloy catalysts were prepared by cyclic voltammetry and used as PEMFC cathodes. The performance of the catalyst was characterized by X-ray diffractometer (XRD),) cyclic voltammetry (CV),) and (EDS), scanning electron microscopy (SEM). The deposition potential of Pt-Fe alloy was determined by cyclic voltammetry, and the effects of electrolyte temperature, potential and scanning rate on the morphology and electrocatalytic performance of the catalyst were investigated. The results showed that the temperature of electrolyte mainly affected the deposition amount and dispersity of the catalyst, but had little effect on the morphology, and the scanning rate mainly affected the crystal growth. When the potential scanning range is -0.4 ~ 0.6V, the scanning rate is 100m V / s, and the electrolyte temperature is 50 鈩，

本文編號(hào)：2227361