Phase-dependent electrocatalytic activities of Pt-anchored rutile, anatase and mixed anatase-rutile TiO2 nano-composites for methanol oxidation in alkali

• Published in: Solid state sciences 2022-07, Vol.129, p.106903, Article 106903
• Main Authors: Chakraborty, Malay, Bera, Kamal Kanti, Mandal, Manas, Ray, Apurba, Das, Sachindranath, Bhunia, Trilochan, Gayen, Arup, Panda, Atanu, Park, Hyung-Ho, Bhattacharya, Swapan Kumar
• Format: Article
• Language: English
• Subjects: Anatase-rutile mixed phase; Electrocatalytic activity; Methanol oxidation
• ISSN: 1293-2558; 1873-3085
• DOI: 10.1016/j.solidstatesciences.2022.106903

Anatase, rutile and mixed anatase-rutile TiO2 are synthesized using a single pot sol-gel technique followed by variation of calcination temperature. The Pt decorated synthesized catalysts have been characterized by diffraction, spectroscopic and microscopic analyses. The cyclic voltammetry (CV) study reveals the increase of forward peak current density of methanol oxidation in alkali on Pt-anchored mixed-phase TiO2 (Pt/ARTiO2) (324.8 A g−1) by 4 and 2.5 times than that on Pt-containing rutile and anatase phases. The charge transfer conductance of the former electrode (1/184 Ω−1) is 5.7 and 8.7 times greater compare to that of the laters. The phase-dependent electrocatalytic activity of the electrodes and large retention (95%) of maximum peak current density at 500th CV cycle for the best electrode, are analyzed by different product selectivity of the electrodes. Pt/ARTiO2 is found to be the best current provider and reliable as it accelerates the formation of formate instead of carbonate. [Display omitted] •One pot facile synthesis of anatase (A), rutile (R), mixed anatase-rutile (AR) TiO2.•Comparison of phase-dependent electrocatalytic activities of different Pt–TiO2.•Enhanced, synergistic electrocatalytic activity of methanol oxidation.•Pt anchored mixed ARTiO2 shows the best catalytic activity of methanol oxidation.•Pt anchored ARTiO2 accelerates formation of formate avoiding that of carbonate.