Pt(Cu) catalyst on TiO2 powder support prepared by photodeposition-galvanic replacement method

High performance of PtCu@TiO2nanocatalysts toward methanol oxidation reaction: from synthesis to molecular picture insight

“…The preparation of the catalyst was done according to the literature procedure. 21 In brief, the photodeposition of Cu on TiO 2 support was carried out as follows: 5 Â 10 À3 M CuSO 4 -$5H 2 O (Merck, ACS reagent) was dissolved in 300 ml water (10 min stirring). Then, 0.2 g TiO 2 powder (Degussa P25) was added to the solution of Cu precursor in the presence of formic acid (85%, ACS reagent).…”

“…20 Herein, we have used a new and efficient catalyst that was obtained by a recently reported alternative two-step method: a photodeposition of Cu on a TiO 2 powder support (containing mainly anatase), followed by a partial galvanic displacement of the Cu deposit by Pt, so that a practical catalyst is prepared. 21 Physicochemical characterization of the obtained PtCu@TiO 2 material was performed. Its electrochemical behavior towards methanol oxidation was also studied to evaluate its activity as a catalyst in fuel cell technology.…”

The Effect of Carbon Content on Methanol Oxidation and Photo-Oxidation at Pt-TiO2-C Electrodes

“…These can be broadly classified as the ones involving modification of the material itself and those based on mixing it with a conducting material such as carbon. The former route includes partial reduction to TiO 2-x (i.e., conversion to Ebonex ® -like materials-see for example [8,9]) or/and incorporating C (activated carbon, reduced graphene oxide or carbon nanotubes) in the material [10][11][12][13][14][15][16][17][18][19][20][21]; the latter modification route is based either on simply mixing the TiO 2 -based material with C [10][11][12][13][14][15][16] or adding the carbonaceous material in the reaction mixture of catalyst preparation or modification (sol-gel chemistry, wet reduction chemistry, carbonization, etc.) [17][18][19][20][21].…”

“…TiO 2 has been used as a support in Pt-based MOR catalysts, mainly due to its apparent ability to oxidize CO at nearby Pt locations in the dark and, also, due to the possibility of further CO photo-oxidation upon its illumination [30]. Among the various methods to deposit Pt on TiO 2 or TiO 2 -based supports [10][11][12][13][14][15][16][17][18][19][20][21] (namely wet chemistry reduction, sol-gel co-deposition, etc. ), UV photo-deposition (reduction of Pt by photo-generated electrons at the surface of illuminated TiO 2 ) is an environmentally friendly and cost effective option [8,13,14,31].…”

“…), UV photo-deposition (reduction of Pt by photo-generated electrons at the surface of illuminated TiO 2 ) is an environmentally friendly and cost effective option [8,13,14,31]. At the same time, in most Pt-TiO 2 systems containing carbon (with the exception of [10,11,15,16,31]) either Pt-C was incorporated in TiO 2 or Pt was deposited on TiO 2 -C composites/mixtures, attenuating direct Pt-TiO 2 interactions. Furthermore, in none of those studies was the effect of added carbon studied systematic, despite the fact that carbon optimization is important to minimize corrosion and light attenuation effects while at the same time provide adequate conductivity.…”