Journal
CHEMSUSCHEM
Volume 13, Issue 23, Pages 6442-6448Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002184
Keywords
CO2 reduction; electrocatalysis; formic acid; polymeric carbon nitride; tin
Funding
- National Key R&D Program of China [2017YFE0127400]
- National Natural Science Foundation of China [51872317, 21835007]
- Science and Technology Commission of Shanghai [20520711900]
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Electrochemical conversion of CO2 into liquid fuels by efficient and earth-abundant catalysts is of broad interest but remains a great challenge in renewable energy production and environmental remediation. Herein, a Sn particle-decorated polymeric carbon nitride (CN) electrocatalyst was successfully developed for efficient, durable, and highly selective CO2 reduction to formic acid. High-resolution X-ray photoelectron spectroscopy confirmed that the metallic Sn particles and CN matrix are bound by strong chemical interaction, rendering the composite catalyst a stable structure. More notably, the electronic structure of Sn was well tuned to be highly electron-rich due to the electron transfer from N atoms of CN to Sn atoms via metal-support interactions, which favored the adsorption and activation of CO2 molecules, promoted charge transport, and thus enhanced the electrochemical conversion of CO2. The composite electrocatalyst demonstrated an excellent Faradaic efficiency of formic acid (FEHCOOH) up to 96 +/- 2 % at the potential of -0.9 V vs. reversible hydrogen electrode, which remained at above 92 % during the electrochemical reaction of 10 h, indicating that the present Sn particle-decorated polymeric carbon nitride electrocatalyst is among the best in comparison with reported Sn-based electrocatalysts.
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