Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (11): 2837-2849.DOI: 10.1016/S1872-2067(22)64138-X
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Jun Huanga,*(), Victor Climentb, Axel Großa,c, Juan M. Feliub,#()
Received:
2022-05-13
Accepted:
2022-07-31
Online:
2022-10-20
Published:
2022-10-20
Contact:
Jun Huang, Juan M. Feliu
Supported by:
Jun Huang, Victor Climent, Axel Groß, Juan M. Feliu. Understanding surface charge effects in electrocatalysis. Part 2: Hydrogen peroxide reactions at platinum[J]. Chinese Journal of Catalysis, 2022, 43(11): 2837-2849.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64138-X
Fig. 1. (a) Polarization curves of hydrogen peroxide reduction and oxidation at Pt(111) [47]. J?app represents the dimensionless apparent current density normalized to the diffusional limiting current density. The electrolyte solution was prepared with NaF/HClO4 mixtures and 1.7 mmol L-1 H2O2. The scan rate is 50 mV s-1 and the rotation rate is 2500 r min-1. The polarization curves are divided into four regions with descriptions detailed in the main text. (b) The absolute intrinsic kinetic current density (|J?int|) in the region 3 as a function of the surface charge density (σM) calculated from Eq. (2) with Cdl = 0.3 Fm-2, and Epzc,SHE = 0.30 VSHE.
Fig. 2. Snapshots of the configuration of charged Pt(111) - water interfaces with one H2O2 molecule in water: (a) the negatively charged Pt(111) with one Li+ cation in water; (b) the positively charged Pt(111) with one F- anion in water; (c) variation of the total energy with the simulation step for the two cases; (d) histograms of the medium distance of the two oxygen atoms of the H2O2 molecule away from the outermost layer of Pt atoms.
Fig. 4. Model-based analysis of hydrogen peroxide reactions at Pt(111). (a) Model-based polarization curves at four pHs, see legends in (c), and the experimental polarization curve for pH = 2, marked as circles. (b) Model-based polarization curves for the case of χ = 0. (c) Surface charging behaviors at four pHs. (d) The forward reaction constant of the step H2O2 + 2■R ↔ 2OHadR at four pHs. (e) The forward reaction constant of the step H2O2 + ■O ↔ OOHadO + H+ + e at four pHs.
Fig. 5. Parametric analysis of the present model of hydrogen peroxide reactions at Pt(111). (a) Influence of EDL parameters on model-based polarization curves at pH = 2. The base line corresponds to the set of model parameters used in Fig. 4, namely, $\delta_{\mathrm{rp}}^{0}=3 \AA, \epsilon_{\mathrm{rp}}=6 \epsilon_{0}, \chi_{\mathrm{rp}}=-5 \times 10^{-10} \mathrm{~m}^{3} \mathrm{C}^{-1}, \mathrm{G}_{\mathrm{a}, 01}^{0}=0.66 \mathrm{eV}$. Other lines are obtained by varying a parameter with the modified value marked aside. (b) Influence of EDL parameters on surface charging relation at pH = 2. (c) Influence of $G_{\mathrm{a}, 01}^{0}$ on model-based polarization curves at pH = 2. (d) Influence of χrp on the surface charging relation.
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