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Doping palladium with tellurium for the highly selective electrocatalytic reduction of aqueous CO2 to CO

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Abstract

Designing highly selective and energy-efficient electrocatalysts to minimize the competitive hydrogen evolution reaction in the electrochemical reduction of aqueous CO2 remains a challenge. In this study, we report that doping Pd with a small amount of Te could selectively convert CO2 to CO with a low overpotential. The PdTe/few-layer graphene (FLG) catalyst with a Pd/Te molar ratio of 1 : 0.05 displayed a maximum CO faradaic efficiency of about 90% at −0.8 V (vs. a reversible hydrogen electrode, RHE), CO partial current density of 4.4 mA cm−2, and CO formation turnover frequency of 0.14 s−1 at −1.0 V (vs. a RHE), which were 3.7-, 4.3-, and 10-fold higher than those of a Pd/FLG catalyst, respectively. Density functional calculations showed that Te adatoms preferentially bind at the terrace sites of Pd, thereby suppressing undesired hydrogen evolution, whereas CO2 adsorption and activation occurred on the high index sites of Pd to produce CO.

Graphical abstract: Doping palladium with tellurium for the highly selective electrocatalytic reduction of aqueous CO2 to CO

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Publication details

The article was received on 10 Jul 2017, accepted on 03 Nov 2017 and first published on 06 Nov 2017


Article type: Edge Article
DOI: 10.1039/C7SC03018E
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY license
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    Doping palladium with tellurium for the highly selective electrocatalytic reduction of aqueous CO2 to CO

    H. Tao, X. Sun, S. Back, Z. Han, Q. Zhu, Alex W. Robertson, T. Ma, Q. Fan, B. Han, Y. Jung and Z. Sun, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C7SC03018E

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