Regulating effect of heterojunctions on electrocatalytic oxidation of methanol for Pt/WO3-NaTaO3 catalysts. Issue 9 (13th February 2019)

• Record Type: Journal Article
• Authors: Bi, Xi; Bai, Ping; Lv, Juanjuan; Yang, Ting; Chai, Zhanli; Wang, Xiaojing; Wang, Cheng
• Is Part Of: Dalton transactions. Volume 48:Issue 9(2019)
• Page Start: 3061
• Page End: 3073
• Publication Date: 2019-02-13
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt05045g
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Pt/WO3 -NaTaO3 composite catalysts for different W/Ta molar ratios were obtained via a facile hydrothermal method. Abstract : Pt/WO3 -NaTaO3 composite catalysts for different W/Ta molar ratios were obtained via a facile hydrothermal method. The WO3 -NaTaO3 heterojunction was constituted and could be regulated by the adjustment of the W : Ta ratio, as confirmed by multiple characterizations. Due to the favorable CO anti-poisoning characteristics ascribed to the sufficient surface –OHad provided by both WO3 and NaTaO3, excellent stability of the WO3 -NaTaO3 composite in acidic and alkaline environments, and charge transfer from metal oxide to Pt, the as-obtained Pt/WO3 -NaTaO3 composite catalyst could exhibit desirably high electrocatalytic performances. As a result, the as-prepared Pt/WO3 -NaTaO3 (W : Ta = 3 : 1) and Pt/WO3 -NaTaO3 (W : Ta = 0.2 : 1) products exhibited optimal performances in the methanol oxidation reaction (MOR) process in acids and alkalis, respectively, as compared to those of commercial Pt/C, Pt/NaTaO3, and Pt/WO3 catalysts. In particular, in acidic and alkaline environments, the highest electrocatalytic activity of Pt/WO3 -NaTaO3 catalyst could reach three times that of commercial Pt/C and its stability could reach more than five times that of commercial Pt/C. Density functional theory calculations further proved the enhancement of WO3 with regard to methanol electrooxidation.