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Issue 2, 2018
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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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Supplementary files

Article information


Submitted
10 Jul 2017
Accepted
03 Nov 2017
First published
06 Nov 2017

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2018,9, 483-487
Article type
Edge Article

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, 9, 483
DOI: 10.1039/C7SC03018E

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