Abstract
Most current research is devoted to electrochemical nitrate reduction reaction for ammonia synthesis under alkaline/neutral media while the investigation of nitrate reduction under acidic conditions is rarely reported. In this work, we demonstrate the potential of TiO2 nanosheet with intrinsically poor hydrogen-evolution activity for selective and rapid nitrate reduction to ammonia under acidic conditions. Hybridized with iron phthalocyanine, the resulting catalyst displays remarkably improved efficiency toward ammonia formation owing to the enhanced nitrate adsorption, suppressed hydrogen evolution and lowered energy barrier for the rate-determining step. Then, an alkaline-acid hybrid Zn-nitrate battery was developed with high open-circuit voltage of 1.99 V and power density of 91.4 mW cm–2. Further, the environmental sulfur recovery can be powered by above hybrid battery and the hydrazine-nitrate fuel cell can be developed for simultaneously hydrazine/nitrate conversion and electricity generation. This work demonstrates the attractive potential of acidic nitrate reduction for ammonia electrosynthesis and broadens the field of energy conversion.
Original language | English |
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Article number | 8036 |
Number of pages | 11 |
Journal | Nature Communications |
Volume | 14 |
Issue number | 1 |
Early online date | 5 Dec 2023 |
DOIs | |
Publication status | Published - Dec 2023 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2023, The Author(s).
Funding
This work was supported by T23-713/22-R by RGC. We thank Dr. M. K. TSE from the Department of Chemistry of the City University of Hong Kong for the NMR measurements.