Print Email Facebook Twitter Accelerating 1H NMR Detection of Aqueous Ammonia Title Accelerating 1H NMR Detection of Aqueous Ammonia Author Kolen, M. (TU Delft ChemE/Materials for Energy Conversion and Storage) Smith, W.A. (TU Delft ChemE/Materials for Energy Conversion and Storage) Mulder, F.M. (TU Delft ChemE/Materials for Energy Conversion and Storage) Date 2021 Abstract Direct electrolytic N2 reduction to ammonia (NH3) is a renewable alternative to the Haber-Bosch process. The activity and selectivity of electrocatalysts are evaluated by measuring the amount of NH3 in the electrolyte. Quantitative 1H nuclear magnetic resonance (qNMR) detection reduces the bench time to analyze samples of NH3 (present in the assay as NH4+) compared to conventional spectrophotometric methods. However, many groups do not have access to an NMR spectrometer with sufficiently high sensitivity. We report that by adding 1 mM paramagnetic Gd3+ ions to the NMR sample, the required analysis time can be reduced by an order of magnitude such that fast NH4+ detection becomes accessible with a standard NMR spectrometer. Accurate, internally calibrated quantification is possible over a wide pH range. To reference this document use: http://resolver.tudelft.nl/uuid:748c3c46-f58b-4419-ada2-fecebf8e2695 DOI https://doi.org/10.1021/acsomega.0c06130 ISSN 0305-0483 Source Omega, 6 (8), 5698-5704 Part of collection Institutional Repository Document type journal article Rights © 2021 M. Kolen, W.A. Smith, F.M. Mulder Files PDF acsomega.0c06130.pdf 1.02 MB Close viewer /islandora/object/uuid:748c3c46-f58b-4419-ada2-fecebf8e2695/datastream/OBJ/view