期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 926, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.116934
关键词
Glycerol electro-oxidation; Stepped Surfaces; Cyclic Voltammetry; Chronoamperometry; Potential oscillations; Electrolyte concentration basal Pt( hkl )
资金
- FAPESP [2013/16930-7, 2019/22183-6, 2014/50279-4, 2020/15230-5]
- FAPEAL [60030-001076/2016]
- CAPES-Brasil (CAPES) [0001, 88887.341974/2019-00]
- CNPq [306060/2017-5, 313455/2021-0]
- RCGI - Research Centre for Gas Innovation
- Shell Brazil
The influence of (bi)sulfate anion on the electro-oxidation of glycerol on Pt(hkl) surfaces was studied. The results showed that stepped surfaces and Pt(1 1 0) exhibited higher catalytic activity in high concentration sulfuric acid solution, and the presence of (1 1 0) step sites influenced the oscillatory behavior.
In the present paper, we have studied the influence of (bi)sulfate anion (0.1 and 0.5 M) on the electro-oxidation of glycerol on basal Pt(hkl) and stepped surfaces belonging to the series of Pt(S)[n(1 1 1) x (11 1)]. Cyclic voltammograms and derivative voltammetry pointed out that the catalytic activity decreases for Pt(1 1 1) and Pt(1 1 0) and, to a minor extent, for stepped surfaces in 0.5 mol/L H2SO4. Chronoamperometric curves demonstrated that above 0.60 V (vs RHE), for both concentrations (0.1 and 0.5 mol/L H2SO4), stepped surfaces and Pt(1 1 0) showed greater ability to catalyze the glycerol electro-oxidation in comparison with Pt(1 1 1). Potential oscillations were mapped along with slow galvanodynamic sweeps and studied at constant current. For Pt(1 1 1), no oscillations were found in the galvanodynamic regime, however, under the galvanostatic regime, period 1 oscillations were observed after a long induction period. The oscillations showed a very sim-ilar profile for stepped surfaces, even for the Pt(3 3 2) surface, which has a high density of (1 1 0) steps. Pattern changes were observed only for Pt(1 1 0) compared to other surfaces. Therefore, we conclude that (1 1 0) step sites influence the oscillatory behavior, thus the insertion of the steps favors the path of formation of inactive species, which compete for the same catalytic sites in a given potential region. The extinction of the mechanism oscillatory occurs differently due to the intrinsic characteristics of each surface electrode for the formation of (hydro)oxides.
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