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An In Situ Quick X‐ray Absorption Spectroscopy Study on Pt 3 Sn/Graphene Catalyst for Ethanol Oxidation Reaction
Author(s) -
Su BingJian,
Wang KuanWen,
Tseng ChungJen,
Lu KueihTzu,
Pao ChihWen,
Lee JyhFu,
Sheu HwoShuenn,
Wu KuangHsu,
Juang JenhYih,
Chen JinMing
Publication year - 2021
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202001400
Subject(s) - graphene , catalysis , materials science , high resolution transmission electron microscopy , nanoparticle , adsorption , chemical engineering , xanes , oxidation state , dissociation (chemistry) , direct ethanol fuel cell , absorption spectroscopy , oxide , inorganic chemistry , nanotechnology , chemistry , spectroscopy , organic chemistry , metallurgy , proton exchange membrane fuel cell , physics , quantum mechanics , transmission electron microscopy , engineering
Direct ethanol fuel cells (DEFCs) promise the use of ethanol as a bio‐renewable and non‐toxic fuel for energy conversion through the ethanol oxidation reaction (EOR). Well dispersed Pt 3 Sn and Pt nanoparticles on graphene (denoted Pt 3 Sn/G and Pt/G) support electrocatalysts made with alcohol reduction were tested towards EOR. The HRTEM and XRD characterizations provide the morphology and crystal phase of the Pt 3 Sn alloy nanoparticles, which has a uniform particle size of 2.8±0.08 nm, as is consistent with a Pt/G catalyst as reference. According to the in‐situ quick X‐ray‐absorption near‐edge structure (QXANES) spectra during an anodic scan of CV for the EOR test to explain clearly the potential‐dependent electronic state of the prepared electrocatalysts, the white‐line intensities of the Pt L 3 ‐edge QXANES spectra and their spectral profiles vary appreciably with the electrode voltage. Moreover, Pt 3 Sn/G shows a better EOR performance than Pt/G because SnO 2 can improve adsorption and dissociation during the oxidation by an appropriate expansion of the lattice parameters in the PtSn alloy. This work provides insight into the reaction mechanism of dissociative adsorption of ethanol on alloyed Pt surface, which has an important role in enhancing the EOR activity for a complete ethanol oxidation.