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Support induced charge transfer effects on electrochemical characteristics of Pt nanoparticle electrocatalysts

DOI: 10.1016/j.jelechem.2017.10.010 DOI Help

Authors: Colleen Jackson (HySA/Catalysis, University of Cape Town) , Graham T. Smith (HySA/Catalysis, University of Cape Town) , Matthew Markiewicz (Imperial College London) , David W. Inwood (University of Southampton) , Andrew S. Leach (University of Southampton) , Penny S. Whalley (University of Southampton) , Anthony R. Kucernak (Imperial College London) , Andrea E. Russell (University of Southampton) , Denis Kramer (University of Southampton) , Pieter B. J. Levecque (HySA/Catalysis, University of Cape Town)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Electroanalytical Chemistry

State: Published (Approved)
Published: October 2017
Diamond Proposal Number(s): 14146

Open Access Open Access

Abstract: The electrokinetic properties of Pt nanoparticles supported on Carbon (Pt/C) and Boron Carbide-Graphite composite (Pt/BC) are compared over a wide potential range. The influence of the support on the electronic state of Pt was investigated via in-situ X-ray Absorption Spectroscopy. Pt d-band filling, determined from XANES white line analysis, was lower and nearly constant between 0.4 and 0.95 V vs. RHE for Pt/BC, indicating more positively charged particles in the double layer region and a delay in the onset of oxide formation by about 0.2 V compared to the Pt/C catalyst, which showed a marked increase in d-band vacancies above 0.8 V vs. RHE. Moreover, Δμ analysis of the XANES data indicated a lack of sub-surface oxygen for the Pt/BC catalyst compared to the Pt/C catalyst above 0.9 V vs. RHE. Additional anion adsorption on the Pt/BC in the double layer region, detected by CO displacement, was also confirmed by XANES analysis of the d-band occupancy. The H2 oxidation activities of electrodes with low catalyst loadings were assessed under high mass transport conditions using the floating electrode methodology. The metal-support interaction between the Pt and BC support improved the maximum hydrogen oxidation current density by 1.4 times when compared to Pt/C.

Journal Keywords: Platinum; Boron carbide; Charge transfer; Metal-support interaction; Mass transport; Hydrogen oxidation; X-ray absorption spectroscopy

Diamond Keywords: Fuel Cells

Subject Areas: Chemistry, Materials, Energy

Instruments: B18-Core EXAFS

Added On: 11/10/2017 08:46


Discipline Tags:

Catalysis Physical Chemistry Energy Energy Storage Materials Science Nanoscience/Nanotechnology Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)