期刊
ACS CATALYSIS
卷 10, 期 2, 页码 1113-1122出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b04348
关键词
EC-MS; FTIRS; EOR; DEFC; electrocatalysis; CO oxidation; transition metal carbide; catalyst support
资金
- FEDER
- EU-FP7 program (DECORE) [NMP4-SL-2012-309741]
- Viera y Clavijo program (ACIISI)
- Viera y Clavijo program (ULL)
- [ENE2017-83976-C2-2-R]
The electrocatalytic behavior of a tungsten carbide-supported Pt(3 wt %)Au(3 wt %)Sn(10 wt %) catalyst (PtAuSn/W2C) is investigated toward the oxidation of ethanol at temperatures below 70 degrees C. Vulcan XC-72-supported Pt(3 wt %)Au(3 wt %)Sn(10 wt %) is used as a reference (PtAuSn/C). For a better understanding of the reaction mechanism, in situ techniques such as electrochemical mass spectrometry (EC-MS) and Fourier transform infrared spectroscopy (FTIRS) are employed. We show that PtAuSn/W2C has a higher electrocatalytic performance than PtAuSn/C, with a CO2 conversion efficiency of 6.5% detected at 0.65 V versus the reversible hydrogen electrode (RHE) at room temperature with on-line quantitative EC-MS measurements. FTIR spectra analysis and EC-MS during the ethanol oxidation reaction (EOR) show C-C bond breaking at the admission potential (0.05 V-RHE) and an onset potential for the CO2 formation at E >= 0.20 V-RHE. The CO tolerance of Pt nanoparticles in PtAuSn/W2C is improved by the presence of oxide species on W2C through a bifunctional mechanism, as well as the electronic charge transfer from the W2C support to the metallic nanoparticles through an electronic effect.
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