Journal
NANO LETTERS
Volume 21, Issue 6, Pages 2650-2657Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00390
Keywords
electrochemical CO2 reduction; formate production; selectivity; nanocapillarity; nanoconfinement
Categories
Funding
- National Key Research and Development Program of China [2017YFA0208200]
- Fundamental Research Funds for the Central Universities of China [0205-14380219, 0205-14913212]
- NSFC [22022505, 21872069, 51761135104]
- Natural Science Foundation of Jiangsu Province [BK20180008]
- Shenzhen Fundamental Research Program of Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20180307155007589]
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By semi-filling bismuth nanorods into nitrogen-doped carbon nanotubes, a highly selective electrocatalytic CO2 reduction reaction was achieved with improved activity and stability of the catalyst.
Electrocatalytic CO2 reduction reaction is regarded as an intriguing route for producing renewable chemicals and fuels, but its development is limited by the lack of highly efficient and stable electrocatalysts. Herein, we propose the pipet-like bismuth (Bi) nanorods semifilled in nitrogen-doped carbon nanotubes (Bi-NRs@NCNTs) for highly selective electrocatalytic CO2 reduction. Benefited from the prominent capillary and confinement effects, the Bi-NRs@NCNTs act as nanoscale conveyors that can significantly facilitate the mass transport, adsorption,and concentration of reactants onto the active sites, realizing rapid reaction kinetics and low cathodic polarization. The spatial encapsulation and separation by the NCNT shells prevents the self-aggregation and surface oxidation of Bi-NRs, increasing the dispersity and stability of the electrocatalyst. As a result, the Bi-NRs@NCNTs exhibit high activity and durable catalytic stability for CO2-to-formate conversion over a wide potential range. The Faradaic efficiency for formate production reaches 90.9% at a moderate applied potential of -0.9 V vs reversible hydrogen electrode (RHE).
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