Optimizing Oxidation State of Octahedral Copper for Boosting Electroreduction Nitrate to Ammonia
Source abstract
Abstract
Electrocatalytic nitrate reduction reaction (NITRR) is a potential candidate for efficient ammonia (NH3) production under ambient conditions in the aqueous media, whereas the direct nine-proton and eight-electron transfer result in low Faraday efficiency and product selectivity. Here, we report that electrochemical NITRR produces NH3 catalyzed by surface oxygen-modified copper nanoparticles wrapped in layered graphitized carbon (Cu@C). The characterization results reveal that Cu@C-800 possesses an optimal oxidation state and exhibits the highest NH3 production Faradaic efficiency of 78 ± 0.9% and a corresponding rate of 51.7 ± 0.6 mmol h–1 g–1 at −0.9 V versus reversible hydrogen electrode. The incorporation of surface oxygen species endows to enhance the binding energy of *NO3 and reduce the energy barrier of *NO to *NOH, the potential rate-determining step. These findings offer a reference for designing efficient catalysts for NITRR to NH3 under ambient conditions.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Ammonia Synthesis and Nitrogen Reduction · Caching and Content Delivery · Advanced Photocatalysis Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P.R. China
Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
Funding
State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · Central University Basic Research Fund of China · National Natural Science Foundation of China · State Key Laboratory of Catalysis · Xing Liao Talents Program · Key Laboratory of Industrial Ecology and Environmental Engineering
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