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Highly Active and Selective Electroreduction of N by the Catalysis of Ga Single Atoms Stabilized on Amorphous TiO Nanofibers. | LitMetric

Highly Active and Selective Electroreduction of N by the Catalysis of Ga Single Atoms Stabilized on Amorphous TiO Nanofibers.

ACS Nano

Shanghai Frontiers Science Center of Advanced Textiles, Innovation Center for Textile Science and Technology, Donghua University, Shanghai 200051, China.

Published: March 2022

AI Article Synopsis

Article Abstract

The electroreduction of N under ambient conditions has emerged as one of the most promising technologies in chemistry, since it is a greener way to make NH than the traditional Haber-Bosch process. However, it is greatly challenged with a low NH yield and faradaic efficiency (FE) because of the lack of highly active and selective catalysts. Inherently, transition (d-block) metals suffer from inferior selectivity due to fierce competition from H evolution, while post-transition (p-block) metals exhibit poor activity due to insufficient "π back-donation" behavior. Considering their distinct yet complementary electronic structures, here we propose a strategy to tackle the activity and selectivity challenge through the atomic dispersion of p-block metal on an all-amorphous transition-metal matrix. To address the activity issue, lotus-root-like amorphous TiO nanofibers are synthesized which, different from vacancy-engineered TiO nanocrystals reported previously, possess abundant intrinsic oxygen vacancies (V) together with under-coordinated dangling bonds in nature, resulting in significantly enhanced N activation and electron transport capacity. To address the selectivity issue, well-isolated single atoms (SAs) of Ga are successfully synthesized through the confinement effect of V, resulting in Ga-V reactive sites with the maximum availability. It is revealed by density functional theory calculations that Ga SAs are favorable for the selective adsorption of N at the catalyst surface, while V can facilitate N activation and reduction subsequently. Benefiting from this coupled activity/selectivity design, high NH yield (24.47 μg h mg) and FE (48.64%) are achieved at an extremely low overpotential of -0.1 V vs RHE.

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Source
http://dx.doi.org/10.1021/acsnano.1c10059DOI Listing

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