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电化学  2010 

酸性溶液中钯催化醇电化学氧化的研究

, PP. 290-295

Keywords: 电催化,,甲醇,乙二醇,现场电化学红外光谱

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Abstract:

应用电化学循环伏安法(CV)和现场红外光谱(FTIR),研究了酸性溶液中钯催化甲醇、乙二醇电氧化的过程.结果表明:在酸性和中性介质中,甲醇和乙二醇在多晶Pd电极上氧化须在1.5V以上才能发生.随着溶液pH值的降低,过电位减小且峰电流密度上升.溶液的pH值以及电极表面形成的吸附含氧物种对Pd电催化氧化醇有显著的影响.现场红外光谱电化学测试显示,在高电位和强酸性介质中,乙二醇在Pd电极上的氧化产物主要是CO2和少量的乙二酸.在酸性和中性介质中,无论在低电位或高电位,甲醇和乙二醇在Pd上氧化的主要产物是CO2,没有发现CO的存在,说明该氧化过程CO2是经过非毒化的路径产生的.

References

[1]  Grgur B N,Markovic N M,Ross P N J.Preparation of a CO tolerant anode catalyst for fuel cells[J].Phys Chem,1998,102:2494-2499.
[2]  Xie Fang-yan(谢方艳).Studies of facilitated mass t-ransport in direct alcohol fuel cell[D].Guangzhou:Sun Yat-sen University,2005.14-15.
[3]  Bianchini C,Shen P K.Palladium-based electrocatalysts for alcohol oxidation in half cells and in direct alcohol fuel cells[J].Chem Rev,2009,109:4183-4206.
[4]  Yan Zhi-yuan(严志远),Xu Chang-wei(徐常威),ShenPei-kang(沈培康).Study of the electrooxidation of glycerol on oxide and Pd/C composite catalysts[J].E-lectrochemistry(电化学),2006,12(4):408-411.
[5]  Shen P K,Xu C W.Alcohol oxidation on nanocrystaline oxide Pd/C promoted electrocatalysts[J].Electrochem Commun,2006,8:184.
[6]  Hu F P,Cui G F,Wei Z D.Improved kinetics of etha-nol oxidation on Pd catalysts supported on tungsten car-bides/carbon nanotubes[J].Electrochimi Acta,2008,53:8341-8345.
[7]  Xu C W,Chen L Q,Shen P K,et al.Methanol and eth-anol electrooxidation on Pt and Pd supported on carbon microspheres in a alkaline media[J].Electrochem Commun,2007,9:997-1001.
[8]  Cui G F,et al.First-principles considerations on cata-lytic activity of Pd toward ethanol oxidation[J].J Phys Chem C,2009:15639-15642.
[9]  Chen Ai-cheng(陈爱成),Sun Shi-gang(孙世刚).In Situ FTIR reflection spectroscopic studies of adsorption and oxidation of ethylene glycol on Pt electrode(I)—acidic media[J].Chem J Chin Univ(高等学校化学学报),1994(15):401-405.
[10]  Fang X.An in situ Fourier transform infrared spectro-electrochemical study on ethanol electrooxidation on Pd in alkaline solution[J].J Power Sources,2010,195:1375-1378.
[11]  Liang Z X,Zhao T S,Xu J B,et al.,Mechanism study of the ethanol oxidation reaction on palladinum in alka-line media[J].J Electrochimi,2203-2208.
[12]  Dong Qing-nian(董庆年).The methods of infrared spectroacopy[M].Beijing:Chemical Industry Press,1979.104-128.
[13]  Wang Mei-li(黄美丽),Sang Lin(桑林),Huang Chen-de(黄成德).Electro-oxidation of methanol on PdNiO/C catalyst in alkaline medium[J].Electrochemistry(电化学),2007,13(4):377-381.
[14]  Wen Gang-yao(文纲要),Zhang Ying(张颖),Yang Zheng-long(杨正龙),et al.Investigation of methanol anode electrooxidation catalysts[J].Electrochemistry(电化学),1998,4(1):73-78.
[15]  Gasteiger H,Markovic N,Ross P.New catalyst with the property of CO tolerance[J].Phys Chem,1995,(99):8290-8296.
[16]  Li Lan-lan(李兰兰),Wei Zi-dong(魏子栋),Yan Can(严灿),et al.Methanol oxidation on a Pt electrode modified by underpotential deposition of Ru[J].Acta Physico-Chimica Sinica(物理化学学报),2007,23(5):723-727.

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