Carbon quantum dot sensitized Pt@Bi2WO6/FTO electrodes for enhanced photoelectro-catalytic activity of methanol oxidation

Abstract

Carbon quantum dot sensitized Pt@Bi₂WO₆/FTO electrodes (simplified as CQDs-Pt@Bi₂WO₆/FTO) were successfully prepared by loading platinum particles onto Bi₂WO₆ nanoplates via a photo-deposition method and sensitized carbon quantum dots (CQDs) via a dip-coating method. The photoelectro-catalytic properties of the Pt@Bi₂WO₆/FTO and CQDs-Pt@Bi₂WO₆/FTO electrodes for methanol oxidation were investigated. The results indicated that the CQDs-Pt@Bi₂WO₆/FTO electrode shows higher photoelectro-catalytic activity and better stability than that of the Pt@Bi₂WO₆/FTO electrode. The higher photoelectro-catalytic performance for methanol oxidation was attributed due to the special synergetic effects between the photocatalytic and electrocatalytic process under solar light irradiation. More importantly, the introduction of CQDs broaden the photoresponse range of the Bi₂WO₆ material and improves the mobility of the photocarriers. Meanwhile, the doped CQDs act as preferential adsorption sites for the intermediate carbonaceous species during methanol oxidation. This not only alleviates CO poisoning towards the Pt particles, but also improves the efficiency of methanol oxidation by constructing a new type of CQDs-Pt electrocatalyst. The composite material, which combines the dual function of photocatalysis and electrocatalysis will be a promising candidate for new photoelectro-catalytic fuel cells.