The Performance Of Transition Metal VIB Compounds As A Counter Electrode Catalyst In Dye-sensitized Solar Cell

The dye-sensitized solar cell?DSC?can convert solar energy into electrical energy of the battery,which is low cost and no pollution to the environment.The device is composed of three parts,one of that we study the part is the counter electrode,which plays a crucial role in the device,can transfer the external circuit electronic and effectively promote the regeneration of redox power.The common electrode is Pt electrode.Because of the expensive price and limited reserves,limit Pt electrode development in the DSC.So looking for non Pt on electrode materials has become the focus of attention at present.In this paper,the preparation of compound VIB is the main line,combined with carbon nanotubes?MWCNTs?,graphene?Graphene?and other good conductivity of carbon materials to prepare the counter electrode,which enrich the types of electrode materials,effectively reducing the cost of electrode.1)The amide/chloride was used as the precursor,which was pyrolyzed for the VIB transition metal carbides,oxides.In acetamide/chloride precursor,acetamide was used as carbon source or oxygen source in different ratio,different temperature,and metal chloride provides metal source.The VIB transition metal carbides,oxides were successfully synthesized through X-ray diffraction results.In electrochemical characterization,catalytic activity of carbides is good,which has the better photoelectric conversion efficiency.The photoelectric conversions of the electrode of Mo₂C,Cr₃C₂ or WC were 3.24%,4.44%or4.83%,respectively.In the oxide,photoelectric conversion electrode of WO₂ got good efficiency,reaching more than 4%.The efficiencies of MoO₂ or Cr₂O₃ on the electrode materials was 2.53%or 2.73%2)Mo₂C and WC were successfully prepared by different sol-gel.The peak positions Mo₂C and WC in X--ray diffraction were consistent,but the peak crystallinity varies,reaction in morphology and electrochemical tests with a certain degree of difference.The carbide particles with acid salts and triethyl amine reaction preparation were uniform,a little of degree of adhesion,the diffraction peak relatively high.In the electrochemical test,the current density was relatively large,promoting the regeneration of iodine,which improve the photoelectric conversion efficiency.The photoelectric conversion of electrode of Mo₂C or WC was 3.52%or 3.96%,respectively.The carbides prepared by the reaction of metal oxides and sucrose are more adhesive,the diffraction peaks are relatively low,and the photoelectric conversion efficiency is very poor in the electrochemical test.The photoelectric conversion of electrode of Mo₂C or WC was 1.78%or 1.50%,respectively.3)Mo₂C and WC,that the catalytic activity is poor,were composited with grapheme and multi walled carbon nanotubes respectively.Due to the conductivity of grapheme and multi walled carbon nanotubes,promote the catalytic activity of Mo₂C and WC on the electrode,obtaining the good performance in the application of DSC.The photoelectric conversion of electrode of Mo₂C/Graphene,Mo₂C/MWCNTs,WC/Graphene or WC/MWCNTs was 5.04%,4.26%,5.23%or 4.45%,respectively.