碳载体不同预处理方法对Pt/C电催化氧化甲醇性能的影响
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摘要
本文分别用混酸水热法(HT)和混酸冷凝回流法(RF)对Vulcan XC-72R碳黑进行预处理,并进一步研究其作为Pt/C催化剂载体的性能。循环伏安实验发现,采用HT法、RF法和未预处理的碳黑作为载体的Pt/C催化剂电催化甲醇氧化的比质量活性(正扫峰电流)分别为1055、704和395 mA/mgpt,即采用HT法预处理碳载体的Pt/C催化剂具有最高的电催化活性,而且计时电流实验也表现出最好的稳定性。实验结果表明,碳载体的预处理方法对制得的Pt/C催化剂的性能具有关键性的影响,且水热法是一种效果较好的预处理碳载体的方法。
Carbon black(Vulcan XC-72R)used as supports for Pt/C catalyst were pretreated through hydrothermal method and reflux condensation by mixing acid,then its performances were studied.The CV experiments showed that the specific electrochemical activity of Pt/C to the electro-oxidation methanol reached to 1055、704 and 395 mA/mg respectively when carbon black were treated by HT、RF methods and untreated(positive peak current).The results indicated that Pt/C catalyst which carbon black were treated by HT method has the best electro-catalytic activity,and CA experiments showed it also has the best stability in all of them.It is clear that pretreatment on carbon black has a critical impact on performance for Pt/C catalyst,and HT method is a better pretreatment method of carbon carrier.
Carbon black(Vulcan XC-72R)used as supports for Pt/C catalyst were pretreated through hydrothermal method and reflux condensation by mixing acid,then its performances were studied.The CV experiments showed that the specific electrochemical activity of Pt/C to the electro-oxidation methanol reached to 1055、704 and 395 mA/mg respectively when carbon black were treated by HT、RF methods and untreated(positive peak current).The results indicated that Pt/C catalyst which carbon black were treated by HT method has the best electro-catalytic activity,and CA experiments showed it also has the best stability in all of them.It is clear that pretreatment on carbon black has a critical impact on performance for Pt/C catalyst,and HT method is a better pretreatment method of carbon carrier.
引文
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[3]Mao A Q,Wang H,Tan L H,et al.Effects of Acid Treat-ment Carbon On Catalytic Perfermonce of RbNO3-KF/ACCatalyst for C2F5I Gas-Phase Synthesis.[J].Chine JCatal,2011,32(6):1011-1016.
[4]Torres G C,Jablonski E L,Baronetti G T,et al.Effect ofthe Carbon Pre-treatment on the Properties and Perform-ance for Nitrobenzene Hydrogenation of Pt/C Catalysts.[J].Appl Catal A-Gene 1997,161(1-2):213-226.
[5]Aksoylu A E,Madalena M,Freitas A,et al.The Effects ofDifferent Activated Carbon Supports and Support Modifica-tions on the Properties of Pt/AC Catalysts.[J].Carbon,2001,39(2):175-185.
[6]Pereira M F R,Soares S F,Figueiredo J L,et al.Adsorp-tion of Dyes on Activated Carbons:Influence of SurfaceChemical Groups.[J].Carbon,2003,41(4):811-821.
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[8]Wang H,Cote R,Faubert G,et al.Effect of the Pre-Treat-ment of Carbon Black Supports on the Activity of Fe-BasedElectrocatalysts for the Reduction of Oxygen.[J].J PhysChem B,1999,103(12):2042-2049.
[9]Antonucci P L,Alderucci V,Giordano N,et al.On theRole of Surface Functional Groups in Pt Carbon Interac-tion.[J].J Appl Electrochem,1994,24(1):58-65.
[10]Fan L Z,Guan H,Qiao S Y,et al.Surface Modificationand Energy Storage Properties of Multi-Walled CarbonNanotubes.[J].J Univ Sci Techno Beijing,2011,33(11):1388-1390.
[11]Wang M X,Xu F,Xie J.Enhanced Carbon Corrosion Re-sistance for FEFC Pt/C Catalysts using Steam-EtchedCarbon Blacks as a Catalyst Support.[J].ElectrochimActa,2012,63:295-301.
[12]Radmilovic V,Gasteiger H A,Ross P N,Structure andChemical-Composition of a Supported Pt-Ru Electrocata-lyst for Methanol Oxidation.[J].J Catal。1995,154(1):98-106.