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The general promoting effect of polydopamine on supported noble metal catalysts

Abstract

The metal-support interaction and corresponding interface regulation are of great importance for the preparation of well-defined supported metal catalysts with outstanding performance. Herein a joint experimental-theoretical study has been conducted to figure out the role of polydopamine (PDA) as an interface facilitator for supported noble metal catalysts. The effects of PDA between various noble metals (Pt, Pd, Au, Ag) and the support (SBA-15) has been systematic investigated in the model reaction of 4-nitrophenol (4-NP) reduction by NaBH4. Based on the kinetic model of 4-NP reduction by NaBH4 and a set of density functional theory calculations on different 4-NP binding energies, a volcano-shaped relationship is present. The volcano-shaped dependence of the reaction rate constant on the 4-NP adsorption energy is observed for the supported noble metal catalysts with/without PDA. The general relationship indicates that PDA can effectively improve catalytic performance via adjusting 4-NP adsorption energy to a more suitable value. The results of charge density difference and Bader charge analysis illustrate the establishment of an ‘electron pool’ by PDA in the system to achieve controllable electronic charge redistribution for an optimized binding when the reactant molecule adsorbs on the metal nanoparticle.

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Publication details

The article was received on 16 Jul 2017, accepted on 07 Sep 2017 and first published on 07 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06204D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    The general promoting effect of polydopamine on supported noble metal catalysts

    M. Zhang, G. Li, X. Sun, Y. Jiang and X. Zhang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06204D

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