Tunable properties of PtxFe1-x electrocatalysts and their catalytic activity towards the oxygen reduction reaction

Nanoscale
Feng-Ju LaiChia-Chun Chen

Abstract

We present the controlled synthesis of bimetallic Pt(x)Fe(1-x) nanoparticles with tunable physical properties and a study of their catalytic activity towards the oxygen reduction reaction (ORR). Composition-induced variations in alloying extent and Pt d-band vacancies in Pt-Fe/C catalysts are systematically investigated. Density functional theoretical calculations are performed in order to realize the electronic effect caused by alloying Pt with Fe. The DFT computational observations revealed that iron donates electrons to platinum, when the Fe 3d and Pt 5d orbitals undergo hybridization. The Pt(x)Fe(1-x) catalysts with various Pt-to-Fe atomic ratios are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), cyclic voltammetry (CV), and X-ray absorption spectroscopy (XAS). TEM images indicate that the dispersion of the metal nanoparticles is uniform and the XAS technique provides significant insight on Pt d-band vacancies and the alloying extent of Pt and Fe in Pt(x)Fe(1-x) nanoparticles. Rotating-disk voltammetry of Pt(x)Fe(1-x) nanoparticle catalysts with various Pt : Fe atomic compositions (3 : 1, 1 : 1, and 1 : 3) revealed that the Pt(1)Fe(1)/C nanocatalyst showed a greater enhancement in ORR acti...Continue Reading

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Citations

Oct 21, 2016·Angewandte Chemie·Bingqing ZhangCan Li
May 4, 2017·Angewandte Chemie·Irene VassaliniIvano Alessandri
Jul 27, 2021·The Journal of Physical Chemistry Letters·Xiaoli Wang, Run Long
Feb 16, 2012·The Journal of Physical Chemistry Letters·Sergey Stolbov, Marisol Alcántara Ortigoza

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