Employing TiO2 anatase （001）-（1 × 4）, futile （110） and futile （011）-（2× 1） single crystal surfaces, we compre- hensively studied the effects of TiO2 surface structures on the competitive adsorption...Employing TiO2 anatase （001）-（1 × 4）, futile （110） and futile （011）-（2× 1） single crystal surfaces, we compre- hensively studied the effects of TiO2 surface structures on the competitive adsorption of water and methanol by means of low energy electron diffraction, thermal desorption spectra and X-ray photoelectron spectroscopy. The relative adsorption strengths of chemisorbed methanol and water vary with the TiO2 surface structures and the ad- sorption sites. This leads to TiO2 surface structure-dependent competitive adsorption of water and methanol. The chemisorption of CH3OH on TiO2 anatase （001）-（1 × 4） surface is seldom affected by pre-covered water at low cov- erages but is affected by pre-covered water at high coverages; the chemisorption of CH3OH on TiO2 rutile （110） surface is seldom affected by pre-covered water; and the chemisorption of CH3OH on TiO2 rutile （011）-（2 × 1） sur- face is affected by pre-covered water even at low coverages. These results deepen the fundamental understandings of surface chemistry on TiO2 surfaces.展开更多
基金This work was financially supported by National Basic Research Program of China （2013CB933104）, National Natural Science Foundation of China （21525313, U 1332113）, Chinese Academy of Sciences （KJZD-EW-M03）, MOE Fundamental Research Funds for the Central Universities （WK2060030017） and Collaborative Innovation Center of Suzhou Nano Science and Technology.
文摘Employing TiO2 anatase （001）-（1 × 4）, futile （110） and futile （011）-（2× 1） single crystal surfaces, we compre- hensively studied the effects of TiO2 surface structures on the competitive adsorption of water and methanol by means of low energy electron diffraction, thermal desorption spectra and X-ray photoelectron spectroscopy. The relative adsorption strengths of chemisorbed methanol and water vary with the TiO2 surface structures and the ad- sorption sites. This leads to TiO2 surface structure-dependent competitive adsorption of water and methanol. The chemisorption of CH3OH on TiO2 anatase （001）-（1 × 4） surface is seldom affected by pre-covered water at low cov- erages but is affected by pre-covered water at high coverages; the chemisorption of CH3OH on TiO2 rutile （110） surface is seldom affected by pre-covered water; and the chemisorption of CH3OH on TiO2 rutile （011）-（2 × 1） sur- face is affected by pre-covered water even at low coverages. These results deepen the fundamental understandings of surface chemistry on TiO2 surfaces.
