Iron Phosphide Electrocatalysts

  • Author: ChemNanoMat
  • Published Date: 19 July 2020
  • Source / Publisher: ChemNanoMat/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Iron Phosphide Electrocatalysts

Iron phosphide nanoparticles show promise as electrocatalysts, for example, for the hydrogen evolution reaction (HER). One way to synthesize iron phosphide nanomaterials is to insert phosphorus into well‐defined iron nanoparticles. However, there is a lack of reactive, yet safe, phosphorus sources for the selective formation of crystalline compounds.


Sophie Carenco, Sorbonne Université, Paris, France, and colleagues have developed a synthetic route to form tetrakis(mesitoyl)cyclotetraphosphane, P4(MesCO)4 (crystal structure pictured above), which can be used as a P source. The team first prepared mesitoyl phosphane (MesCO–PH2) by reacting [NaPH2 × Na(OtBu)x] with mesitoylmethylester. The mesitoyl phosphane was then reacted with hexachloroethane and trimethylamine to give the desired product in an isolated yield of 10 %.


The researchers reacted P4(MesCO)4 with colloidal iron nanoparticles to form FeP and Fe2P nanoparticles of similar diameters (pictured below). They obtained hollow, crystalline FeP and Fe2P nanoparticles when the reaction was performed at 250 °C. At a lower temperature of 180 °C, amorphous nanoparticles were obtained. These phases were also formed as an intermediate in the synthesis of the crystalline particles.


The team investigated the electrocatalytic properties of amorphous and crystalline FeP nanoparticles, as well as crystalline Fe2P nanoparticles, for the hydrogen evolution reaction (HER) in acidic and neutral electrolytes. In both electrolytes, amorphous FeP was a more efficient catalyst than crystalline FeP, and crystalline Fe2P was the least active catalyst. According to the researchers, these results could provide a path to a more systematic investigation of amorphous metal phosphide phases in electrocatalysis.

 


 

 

Article Views: 993

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more

Follow on Facebook Follow on Twitter Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH