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Efficient Electrochemical Reduction of CO2 to HCOOH over Sub-2 nm SnO2 Quantum Wires with Exposed Grain Boundaries.

08:00 EDT 11th April 2019 | BioPortfolio

Summary of "Efficient Electrochemical Reduction of CO2 to HCOOH over Sub-2 nm SnO2 Quantum Wires with Exposed Grain Boundaries."

Electrochemical reduction of CO2 to high-value products holds the potential to mitigate the environmental problems originated from CO2 emission. Although grain boundaries (GBs) have been tailored to tune the binding energies of reaction intermediates and consequently accelerate the CO2 reduction reaction (CO2RR), it still remains challenging to exclusively clarify the correlation between GBs and the enhanced reactivity in nanostructured materials with small dimension (e.g., below 10 nm). Herein, sub-2 nm SnO2 quantum wires (QWs) composed of individual quantum dots (QDs) and numerous GBs on the surface were synthesized, and examined for CO2RR toward HCOOH formation. In contrast to SnO2 nanoparticles (NPs) with a larger electrochemically active surface area (ECSA), the ultrathin SnO2 QWs with exposed GBs show enhanced current density (j), significantly improved Faradaic efficiency (FE) of over 80% for HCOOH and ~90% for C1 products as well as energy efficiency (EE) of over 50% in a wide potential window, among which maximum values of FE (87.3%) and EE (52.7%) are achieved. The collective contributions of GBs, lowered work function and increased CO2 adsorption capacity highlight the superiority of the ultrathin SnO2 QWs as an electrocatalyst for CO2RR toward HCOOH formation.

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This article was published in the following journal.

Name: Angewandte Chemie (International ed. in English)
ISSN: 1521-3773
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