Efficient conversion of low-concentration nitrate sources into ammonia on a Ru-dispersed Cu nanowire electrocatalyst
Journal Article
·
· Nature Nanotechnology
- Rice University, Houston, TX (United States)
- Arizona State University, Tempe, AZ (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Canadian Light Source, Saskatoon (Canada)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
We report electrochemically converting nitrate ions, a widely distributed nitrogen source in industrial wastewater and polluted groundwater, into ammonia represents a sustainable route for both wastewater treatment and ammonia generation. However, it is currently hindered by low catalytic activities, especially under low nitrate concentrations. Here we report a high-performance Ru-dispersed Cu nanowire catalyst that delivers an industrial-relevant nitrate reduction current of 1 A cm–2 while maintaining a high NH3 Faradaic efficiency of 93%. More importantly, this high nitrate-reduction catalytic activity enables over a 99% nitrate conversion into ammonia, from an industrial wastewater level of 2,000 ppm to a drinkable water level <50 ppm, while still maintaining an over 90% Faradaic efficiency. Coupling the nitrate reduction effluent stream with an air stripping process, we successfully obtained high purity solid NH4Cl and liquid NH3 solution products, which suggests a practical approach to convert wastewater nitrate into valuable ammonia products. Density functional theory calculations reveal that the highly dispersed Ru atoms provide active nitrate reduction sites and the surrounding Cu sites can suppress the main side reaction, the hydrogen evolution reaction.
- Research Organization:
- Argonne National Laboratory (ANL), Lemont, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- Canada Foundation for Innovation (CFI); Canadian Institutes of Health Research (CIHR); National Research Council (Canada); National Research Council (NRC); National Science Foundation; National Science Foundation (NSF); Natural Sciences and Engineering Research Council (NSERC); Natural Sciences and Engineering Research Council of Canada (NSERC); Oak Ridge National Laboratory (ORNL); Rice University; USDOE Office of Science (SC), Biological and Environmental Research (BER); University of Saskatchewan; Welch Foundation
- Grant/Contract Number:
- AC02-06CH11357; AC05-00OR22725; AC05-76RL01830
- OSTI ID:
- 1883856
- Alternate ID(s):
- OSTI ID: 1991344
- Journal Information:
- Nature Nanotechnology, Journal Name: Nature Nanotechnology Journal Issue: 7 Vol. 17; ISSN 1748-3387
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
A multifunctional copper single-atom electrocatalyst aerogel for smart sensing and producing ammonia from nitrate
Journal Article
·
Mon Jun 19 20:00:00 EDT 2023
· Proceedings of the National Academy of Sciences of the United States of America
·
OSTI ID:1985942