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      Metal dicyanamides as efficient and robust water-oxidation catalysts

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      Embargo Lift Date: 2018-01-23
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      Author(s)
      Nune, S. V. K.
      Basaran, A. T.
      Ülker, E.
      Mishra, R.
      Karadas, F.
      Date
      2017
      Source Title
      ChemCatChem
      Print ISSN
      1867-3880
      Electronic ISSN
      1867-3899
      Publisher
      Wiley Blackwell
      Volume
      9
      Issue
      2
      Pages
      300 - 307
      Language
      English
      Type
      Article
      Item Usage Stats
      265
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      305
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      Abstract
      Non-oxide cobalt-based water-oxidation electrocatalysts have received attention recently for their relative ease of preparation, they are stable both in acidic and basic media, and they have higher turnover frequencies than cobalt oxides. Recent studies show that one of the main bottlenecks in the implementation of non-oxide systems to water splitting is the low number of active metal sites, which is in the order of nmol cm−2. Herein, a new series of non-oxide water-oxidation catalysts has been introduced to the field. Cobalt dicyanamides are observed to have around four times higher surface active sites and better catalytic performances than cyanide-based systems. Long-term catalytic studies (70 h) at an applied potential of 1.2 V and electrochemical studies performed in solutions in pH values of 3.0–12.0 indicate that the compounds are robust and retain their structures even under harsh conditions. Moreover, the addition of Ni impurities to cobalt dicyanamides is a feasible method to improve their catalytic activities.
      Keywords
      Amides
      Catalysts
      Cobalt
      Electrocatalysts
      Electrochemistry
      Metals
      Oxidation
      Applied potentials
      Catalytic performance
      Electrochemical studies
      Surface active sites
      Turnover frequency
      Water oxidation catalysts
      Water splitting
      Catalyst activity
      Permalink
      http://hdl.handle.net/11693/36416
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/cctc.201600976
      Collections
      • Department of Chemistry 707
      • Institute of Materials Science and Nanotechnology (UNAM) 2260
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