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Bimetallic Core-Based Cuboctahedral Core-Shell Nanocluster for Hydrogen Peroxide (2e- reduction) over Water (4e- reduction) Formation: Role of Core Metals

Abstract

The designing of an efficient and selective catalyst for hydrogen peroxide (H2O2) formation is highly sought due to its importance in industries. Unlike conventional Pd-Au alloy based catalyst, the catalytic activity of three cuboctahedral core-shell nanocluster (Au19@Pt60, Co19@Pt60 and Au10Co9@Pt60) has been investigated toward H2O2 formation and compared that with the pure Pt cuboctahedral NC (Pt79). Much attention has been devoted to thermodynamic and kinetic parameters to find out the feasibility of 2e- over 4e- oxygen reduction reaction (ORR) to improve the product selectivity (H2O vs. H2O2). Elementary steps correspond to H2O2 formation are significantly improved over Au10Co9@Pt60 nanocluster (NC) than that on the pure, core-shell NCs, periodic surface based catalysts. Furthermore, Au10Co9@Pt60 NC favours H2O2 formation via the much desired Langmuir-Hinshelwood mechanism. The potential dependent study shows that the H2O2 formation is thermodynamically favourable up to 0.43 V on Au10Co9@Pt60 NC and thus significantly lowers the overpotential for 2e- ORR process. Besides, the Au10Co9@Pt60 NC is very much selective towards H2O2 formation over H2O formation.

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Publication details

The article was received on 27 Apr 2017, accepted on 15 Jun 2017 and first published on 16 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR03002A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Bimetallic Core-Based Cuboctahedral Core-Shell Nanocluster for Hydrogen Peroxide (2e- reduction) over Water (4e- reduction) Formation: Role of Core Metals

    A. Mahata and B. Pathak, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR03002A

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