摘要
研究对比了商业化碳分子筛(CMS)、多壁碳纳米管、活性炭和还原氧化石墨烯四种碳材料的I3−还原性能。采用场发射扫描电镜、高倍率透射电镜、X射线衍射等技术手段表征了材料的微观结构特征,结合循环伏安(CV)和光电转换测试(I-V)结果,解耦了材料的构效关系。结果发现,以CMS为对电极组装的DSSCs的光电转换效率最高,达7.46%。在此基础上,研究考察了高温退火处理对CMS的微观结构、性质和性能的影响,揭示了影响I3^−还原性能的关键因素。结果表明,800℃处理的样品CMS800光电转换效率高达8.56%,明显优于贵金属Pt对电极,同时表现出优于Pt的电化学稳定性。
The study compared the I3^− reduction properties of four carbon materials,commercial carbon molecular sieve(CMS),multi-walled carbon nanotubes,activated carbon and reduced graphene oxide.The morphology and structure of the materials were characterized by FESEM,TEM and XRD,and their catalytic performance for I3^- reduction was evaluated by cyclic voltammetry,electrochemical impedance spectroscopy and Tafel polarization test.Compared with other materials,CMS possesses the highest power conversion efficiency of 7.46%as the CE materials in DSSCs.The effects of annealing temperatures on themorphology,structure and electrocatalytic activity of CMS were also investigated.The as-made CMS800 via thermal annealing at 800℃ achieves a high power conversion efficiency of 8.56%,which is significantly better than the precious metal Pt counter electrode,and at the same time shows better electrochemical stability than that of Pt.
作者
姚春
黄龙龙
常江伟
丁一旺
于畅
邱介山
YAO Chun;HUANG Longlong;CHANG Jiangwei;DING Yiwang;YU Chang;QIU Jieshan(State Key Laboratory of Fine Chemicals,Liaoning Key Laboratory for Energy Materials and Chemical Engineering,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第6期2696-2704,共9页
CIESC Journal
基金
国家自然科学基金项目(51872035)
中央高校基本科研业务专项资金(DUT19LAB20)。
关键词
染料敏化太阳能电池
碳分子筛
光电转换效率
催化活性
I3^−还原
dye-sensitized solar cells
carbon molecular sieves
power conversion efficiency
catalytic activity
triiodide reduction
