Abstract
The high price of catalyst and poor durability still restrict the development of fuel cells. In this work, core-shell structured PtxMoy@TiO2 nanoparticles with low Pt content are prepared by a reverse microemulsion method. The morphologies, particle size, structure, and composition of PtxMoy@TiO2 nanoparticles are examined by several techniques such as X-ray Diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy, etc. The PtxMoy@TiO2 electrocatalysts show significantly higher catalytic activity and better durability for methanol oxidation than the commercial Pt/C (ETEK). Compared to Pt/C catalyst, the enhancement of the electrochemical performance of PtxMoy@TiO2 electrocatalysts can be attributed to the core-shell structure and the shift of the d-band center of Pt atoms, which can weaken the adsorption strength toward CO molecules, facilitate the removal of the CO groups and improve electrocatalytic activity. The development of PtxMoy@TiO2 electrocatalysts is promising to reduce the use of noble metal Pt and has a great potential for application in fuel cells.
Highlights
Direct methanol fuel cell (DMFC) is becoming more and more popular because of its abundant fuel sources, high energy density (6.09 Kwh Kg−1), environmental friendliness, high conversion, and low price (Zhao et al, 2011; Zhu et al, 2014; Lin et al, 2020)
Because the content of PtMo is much lower than TiO2 and SiO2, the intensities of PtMo diffraction peaks are much lower than TiO2 and SiO2
The results indicate that methanol oxidation reaction (MOR) can occur more on the Pt0.25Mo0.75@TiO2 than on the ETEK
Summary
Direct methanol fuel cell (DMFC) is becoming more and more popular because of its abundant fuel sources, high energy density (6.09 Kwh Kg−1), environmental friendliness, high conversion, and low price (Zhao et al, 2011; Zhu et al, 2014; Lin et al, 2020). Various nanostructured architectures have been investigated including nanoframe, nanocrystal, nanowires, core-shell, and nanoclusters (Lang et al, 2016; Lu et al, 2016; Kwon et al, 2018; Oh et al, 2018; Liu et al, 2019). Among these nanostructures, core-shell structure is very special and has been widely used in electrocatalysis. The enhancement of catalytic performances for methanol oxidation reaction (MOR) was ascribed to the synergistic effect of oxide core and the shell surface.
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