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  Experimental and theoretical assessment of Ni-based binary compounds for the hydrogen evolution reaction

Ledendecker, M., Schlott, H., Antonietti, M., Meyer, B., & Shalom, M. (2017). Experimental and theoretical assessment of Ni-based binary compounds for the hydrogen evolution reaction. Advanced Energy Materials, 7(5): 1601735. doi:10.1002/aenm.201601735.

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 Creators:
Ledendecker, Marc1, Author           
Schlott, Hannah, Author
Antonietti, Markus2, Author           
Meyer, Bernd, Author
Shalom, Menny3, Author           
Affiliations:
1Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863288              
2Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              
3Menny Shalom, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2205635              

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Free keywords: binary compounds, hydrogen evolution reaction, nickel, water splitting, electrolysis
 Abstract: Metallic binary compounds have emerged in recent years as highly active and stable electrocatalysts toward the hydrogen evolution reaction. In this work, the origin of their high activity from a theoretical and experimental point of view is elucidated. Here, different metallic ceramics as Ni3S2, Ni3N, or Ni5P4 are grown directly on Ni support in order to avoid any contaminations. The correlation of theoretical calculations with detailed material characterization and electrochemical testing paves the way to a deeper understanding of possible active adsorption sites for each material and the observed catalytic activity. It is shown that heteroatoms as P, S, and N actively take part in the reaction and do not act as simple spectator. Due to the anisotropic nature of the materials, a variety of adsorption sites with highly coverage-dependent properties exists, leading to a general shift in hydrogen adsorption free energies ΔGH close to zero. Extending the knowledge gained about the here described materials, a new catalyst is prepared by modifying a high surface Ni foam, for which current densities up to 100 mA cm−2 at around 0.15 V (for Ni3N) are obtained.

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 Dates: 2016-11-172017
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/aenm.201601735
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Title: Advanced Energy Materials
  Abbreviation : Adv. Energy Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 7 (5) Sequence Number: 1601735 Start / End Page: - Identifier: ISSN: 1614-6832