Affiliation:
1. Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
2. School of Materials and Environmental Engineering Shenzhen Polytechnic University Shenzhen 518055 China
3. Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China
Abstract
AbstractImproving the selective ammonia production capacity of electrocatalytic nitrate reduction reaction (NO3RR) at ambient conditions is critical to the future development and industrial application of electrosynthesis of ammonia. However, the reaction involves multi‐proton and electron transfer as well as the desorption and underutilization of intermediates, posing a challenge to the selectivity of NO3RR. Here the electrodeposition site of Co is modulated by depositing Bi at the bottom of the catalyst, thus obtaining the Co+Bi@Cu NW catalyst with a Bi‐Co corridor structure. In 50 mm NO3−, Co+Bi@Cu NW exhibits a highest Faraday efficiency of ≈100% (99.51%), an ammonia yield rate of 1858.2 µg h−1 cm−2 and high repeatability at −0.6 V versus the reversible hydrogen electrode. Moreover, the change of NO2− concentration on the catalyst surface observed by in situ reflection absorption imaging and the intermediates of the NO3RR process detected by electrochemical in situ Raman spectroscopy together verify the NO2− trapping effect of the Bi‐Co corridor structure. It is believed that the measure of modulating the deposition site of Co by loading Bi element is an easy‐to‐implement general method for improving the selectivity of NH3 production as well as the corresponding scientific research and applications.
Funder
Natural Science Foundation of Guangdong Province
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
49 articles.
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