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We have sought to improve the electrocatalytic performance of tungsten nitride through synthetic control over chemical composition and morphology. In particular, we have generated a thermodynamically unstable but catalytically promising nitrogen-rich phase of tungsten via a hydrothermal generation of a tungsten oxide intermediate and subsequent annealing in ammonia. The net product consisted of three-dimensional (3D) micron-scale flower-like motifs of W2N3; this architecture not only evinced high structural stability but also incorporated the favorable properties of constituent two-dimensional nanosheets. From a performance perspective, as-prepared 3D W2N3 demonstrated promising hydrogen evolution reaction (HER) activities, especially in an acidic environment with a measured overpotential value of -101 mV at a current density of 10 mA/cm2. To further enhance the electrocatalytic activity, small amounts of precious metal nanoparticles (such as Pt and Au), consisting of variable sizes, were uniformly deposited onto the underlying 3D W2N3 motifs using a facile direct deposition method; these composites were applied towards the CO2 reduction reaction (CO2RR). A highlight of this series of experiments was that Au/W2N3 composites were found to be a much more active HER (as opposed to either a CO2RR or a methanol oxidation reaction (MOR)) catalyst.


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Synthesis and electrocatalytic applications of flower-like motifs and associated composites of nitrogen-enriched tungsten nitride (W2N3)

Show Author's information Sha Tan1Brian M. Tackett2Qun He2Ji Hoon Lee2Jingguang G. Chen2,3( )Stanislaus S. Wong1( )
Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA
Department of Chemical Engineering, Columbia University, New York, NY 10027, USA
Chemistry Department, Building 555, Brookhaven National Laboratory, Upton, NY 11973, USA

Abstract

We have sought to improve the electrocatalytic performance of tungsten nitride through synthetic control over chemical composition and morphology. In particular, we have generated a thermodynamically unstable but catalytically promising nitrogen-rich phase of tungsten via a hydrothermal generation of a tungsten oxide intermediate and subsequent annealing in ammonia. The net product consisted of three-dimensional (3D) micron-scale flower-like motifs of W2N3; this architecture not only evinced high structural stability but also incorporated the favorable properties of constituent two-dimensional nanosheets. From a performance perspective, as-prepared 3D W2N3 demonstrated promising hydrogen evolution reaction (HER) activities, especially in an acidic environment with a measured overpotential value of -101 mV at a current density of 10 mA/cm2. To further enhance the electrocatalytic activity, small amounts of precious metal nanoparticles (such as Pt and Au), consisting of variable sizes, were uniformly deposited onto the underlying 3D W2N3 motifs using a facile direct deposition method; these composites were applied towards the CO2 reduction reaction (CO2RR). A highlight of this series of experiments was that Au/W2N3 composites were found to be a much more active HER (as opposed to either a CO2RR or a methanol oxidation reaction (MOR)) catalyst.

Keywords: composite, synthesis, electrocatalysis, morphology control, tungsten nitride

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Publication history
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Acknowledgements

Publication history

Received: 27 November 2019
Revised: 14 January 2020
Accepted: 29 January 2020
Published: 09 March 2020
Issue date: May 2020

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Acknowledgements

This material is based on work performed in SSW’s laboratory, supported by the U.S. National Science Foundation under Grant No. CHE-1807640. Structural characterization experiments (TEM, SEM, and XPS) for this manuscript were performed in part at the Center for Functional Nanomaterials, located at Brookhaven National Laboratory, which is supported by the U.S. Department of Energy under Contract No. DE-SC-00112704. Authors from Columbia University acknowledge support from the U.S. Department of Energy, Office of Science, Catalysis Science Program (No. DE-FG02-13ER16381). B. M. T. acknowledges support from the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education for the DOE under contract number DE-SC0014664.

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