Ternary Sn-Ti-O Electrocatalyst Boosts the Stability and Energy Efficiency of CO2Reduction
- 27 July 2020
- journal article
- research article
- Published by Wiley in Angewandte Chemie-International Edition
- Vol. 59 (31), 12860-12867
- https://doi.org/10.1002/anie.202004149
Abstract
Simultaneously improving energy efficiency (EE) and material stability in electrochemical CO(2)conversion remains an unsolved challenge. Among a series of ternary Sn-Ti-O electrocatalysts, 3D ordered mesoporous (3DOM) Sn(0.3)Ti(0.7)O(2)achieves a trade-off between active-site exposure and structural stability, demonstrating up to 71.5 % half-cell EE over 200 hours, and a 94.5 % Faradaic efficiency for CO at an overpotential as low as 430 mV. DFT and X-ray absorption fine structure analyses reveal an electron density reconfiguration in the Sn-Ti-O system. A downshift of the orbital band center of Sn and a charge depletion of Ti collectively facilitate the dissociative adsorption of the desired intermediate COOH* for CO formation. It is also beneficial in maintaining a local alkaline environment to suppress H(2)and formate formation, and in stabilizing oxygen atoms to prolong durability. These findings provide a new strategy in materials design for efficient CO(2)conversion and beyond.Funding Information
- Natural Sciences and Engineering Research Council of Canada (University of Waterloo, and Waterloo Institute for Nanotechnology)
- National Natural Science Foundation of China (U1909213, 51922008 and 51872075)
- Henan University (111 Project (Grant No. D17007), Henan Centre for Outstanding Overseas Scientists (Grant No. GZS2018003))
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