物理化学学报
物理化學學報
물이화학학보
ACTA PHYSICO-CHIMICA SINICA
2014年
8期
1487-1494
,共8页
苏佳%芦姗%王莎莎%张雪华%付玉彬%贺涛
囌佳%蘆姍%王莎莎%張雪華%付玉彬%賀濤
소가%호산%왕사사%장설화%부옥빈%하도
聚吡咯%电化学聚合%pH值%电催化活性%对电极%染料敏化太阳电池
聚吡咯%電化學聚閤%pH值%電催化活性%對電極%染料敏化太暘電池
취필각%전화학취합%pH치%전최화활성%대전겁%염료민화태양전지
Polypyrrole%Electrochemical polymerization%pH value%Electrocatalytic activity%Counter electrode%Dye-sensitized solar cel
电化学合成聚吡咯(PPy)时，聚合电解液的pH值对PPy薄膜的形貌和性质有较大的影响，进而影响PPy薄膜对I-/I3-的电催化活性以及基于PPy对电极(CE)的染料敏化太阳电池(DSSCs)的光电转换性能.本文采用电化学恒电位方法，在掺杂氟的SnO2(FTO)导电玻璃上合成出了对甲苯磺酸根离子掺杂的聚吡咯(PPy-TsO)电极，并将其作为DSSCs的对电极.通过改变吡咯聚合时聚合电解液的pH值，借助扫描电镜(SEM)、紫外-可见(UV-Vis)吸收光谱、X-射线光电子能谱(XPS)和循环伏安(CV)等表征技术，详细探讨了聚合溶液pH值对PPy CE形貌、结构及其对I-/I3-的电催化性能的影响.研究发现在pH 2.0下合成的聚吡咯对阴离子掺杂率最高且链共轭性最佳，具有对I-/I3-氧化还原介质最强的催化能力，基于此PPy CE的电池光电转化效率也最高. pH值太大或太小都不利于生成具有高掺杂率和高催化活性的PPy电极，组装成DSSCs后的光电转换效率也较低.
電化學閤成聚吡咯(PPy)時，聚閤電解液的pH值對PPy薄膜的形貌和性質有較大的影響，進而影響PPy薄膜對I-/I3-的電催化活性以及基于PPy對電極(CE)的染料敏化太暘電池(DSSCs)的光電轉換性能.本文採用電化學恆電位方法，在摻雜氟的SnO2(FTO)導電玻璃上閤成齣瞭對甲苯磺痠根離子摻雜的聚吡咯(PPy-TsO)電極，併將其作為DSSCs的對電極.通過改變吡咯聚閤時聚閤電解液的pH值，藉助掃描電鏡(SEM)、紫外-可見(UV-Vis)吸收光譜、X-射線光電子能譜(XPS)和循環伏安(CV)等錶徵技術，詳細探討瞭聚閤溶液pH值對PPy CE形貌、結構及其對I-/I3-的電催化性能的影響.研究髮現在pH 2.0下閤成的聚吡咯對陰離子摻雜率最高且鏈共軛性最佳，具有對I-/I3-氧化還原介質最彊的催化能力，基于此PPy CE的電池光電轉化效率也最高. pH值太大或太小都不利于生成具有高摻雜率和高催化活性的PPy電極，組裝成DSSCs後的光電轉換效率也較低.
전화학합성취필각(PPy)시，취합전해액적pH치대PPy박막적형모화성질유교대적영향，진이영향PPy박막대I-/I3-적전최화활성이급기우PPy대전겁(CE)적염료민화태양전지(DSSCs)적광전전환성능.본문채용전화학항전위방법，재참잡불적SnO2(FTO)도전파리상합성출료대갑분광산근리자참잡적취필각(PPy-TsO)전겁，병장기작위DSSCs적대전겁.통과개변필각취합시취합전해액적pH치，차조소묘전경(SEM)、자외-가견(UV-Vis)흡수광보、X-사선광전자능보(XPS)화순배복안(CV)등표정기술，상세탐토료취합용액pH치대PPy CE형모、결구급기대I-/I3-적전최화성능적영향.연구발현재pH 2.0하합성적취필각대음리자참잡솔최고차련공액성최가，구유대I-/I3-양화환원개질최강적최화능력，기우차PPy CE적전지광전전화효솔야최고. pH치태대혹태소도불리우생성구유고참잡솔화고최화활성적PPy전겁，조장성DSSCs후적광전전환효솔야교저.
The pH of the solution used to produce an electro-polymerized polypyrrole (PPy) film has a significant impact on the morphology and properties of the resulting film and, by extension, on the electrocatalytic activity of the film for the I-/I3-redox reaction. Accordingly, the performance of dye-sensitized solar cells (DSSCs) based on PPy counter electrodes (CEs) is affected by solution pH. In this study, p-toluene sulfonate ion-doped PPy (PPy-TsO) CEs on fluorine-doped tin oxide (FTO) glass substrates were fabricated using an electrochemical method under a constant bias in solutions with various pH values. The effect of the pH of the synthetic solution on the morphology, structure, and electrocatalytic activity during the I-/I3-redox reaction of the obtained PPy CEs was thoroughly investigated by scanning electron microscopy (SEM), UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). A pH value of 2.0 was found to represent the optimal value, since the PPy-TsO film produced at this pH exhibited the highest degree of doping, the longest conjugation length, and the highest catalytic activity. When working as the CE of a DSSC, this film also showed the highest power conversion efficiency. Films synthesized at pH values either above or below 2.0 exhibited inferior properties and lower performance when in DSSCs.
