A5087339614- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Catalytic Processes in Materials Science
- Supercapacitor Materials and Fabrication
- Topological Materials and Phenomena
- Nanomaterials for catalytic reactions
- 2D Materials and Applications
- Graphene research and applications
Ruhr University Bochum
2017-2024
Aix-Marseille Université
2016
Centre National de la Recherche Scientifique
2016
An excellent electrocatalyst for reversible oxygen reduction and evolution synthesized by direct growth of nitrogen-doped carbon nanotubes on cobalt boride nanoparticles.
Abstract A facile strategy is reported for the synthesis of Fe/Co mixed metal oxide nanoparticles supported on, and embedded inside, high purity oxidized multiwalled carbon nanotubes (MWCNTs) narrow diameter distribution as effective bifunctional catalysts able to reversibly drive oxygen evolution reaction (OER) reduction (ORR) in alkaline solutions. Variation ratio resulted a pronounced trend ORR/OER activity. Controlled in‐depth characterization enabled identification an optimal...
Spray-flame synthesis was used to produce high-surface-area perovskite electrocatalysts with high phase purity, minimum surface contamination, and electrochemical stability. In this study, as-prepared LaCo1–xFexO3 nanoparticles (x=0.2, 0.3, 0.4) were found contain a degree of combustion residuals, mostly consist both, stoichiometric oxygen-deficient phases. Heating them at moderate temperature (250 °C) in oxygen could remove residuals increases the content while preventing particle growth. A...
Abstract High‐performance bifunctional electrocatalysts for the oxygen reduction (ORR) and evolution reaction (OER) are essential components in energy conversion storage technologies. Yet, their poor reversibility hinders applicability. A highly active ORR/OER catalyst, consisting of multiwalled carbon nanotubes‐supported MnFeNiOx nanoparticles, was subjected to sequences chronoamperometric steps alternating between ORR, OER cathodic potentials ( E c ). Rotating ring disk electrode methods...
Abstract Understanding the structure‐property relations of non‐precious metal heteroatom co‐doped carbon electrocatalysts exhibiting high activity as well long‐term durability for both ORR and OER remains challenging but is indispensable development bifunctional ORR/OER electrocatalysts. We propose B‐N‐co‐doped graphitic 2D nanostructures impregnated with controlled amount transition metals (M‐BCN; M=Co, Ni, Fe, Cu) Co‐BCN outperformed Ni‐, Fe‐, Cu‐based BCN catalysts potential values 0.87 V...
The Cover Feature shows a spray-flame reactor used to synthesize perovskite catalyst nanoparticles. blue methane/oxygen pilot flame at the bottom ignites combustible precursor aerosol injected via centric nozzle. Nanoparticle formation downstream of reaction zone leads metastable, highly active LaCo1–xFexO3 catalysts with improved oxygen evolution activity. image was taken by Samer Suleiman. More information can be found in Aricle B. Alkan et al.
The stability of electrocatalysts is great importance to ensure their applicability, but generally only considered for catalysts polarised a constant potential or current density. This excludes evaluation under start/stop conditions in fuel cell reversible batteries which the catalyst alternately high opposite potentials. For example, poor cyclability metal-air mainly due decrease oxygen reduction activity during applied potentials evolution reaction battery charging. To investigate and at...
Abstract Redox polymers with distinct redox units have been long recognized for their pseudocapacitive and reversible charge storage behaviour. Many systems investigated so far utilized organic electrolytes and/or coupled a polymer half‐cell to non‐polymer counter electrode. However, due safety sustainability considerations, aqueous electrolyte based in all‐polymer configurations is considered promising option possible future applications. We present strategy on Osmium‐complex...
In secondary metal-air batteries, it is indispensable to develop novel bifunctional catalysts for the low overpotential oxygen reduction/oxygen evolution reaction allow on one hand very high energy density combined with capacity and price. 1,2 Therefore, widespread use of rechargeable batteries strongly depends substitution precious metal-based electrocatalysts towards reduction (ORR) (OER) from high-abundant materials. 3 This seems be possible since electrolyte in typical Ni- or Zn-metal...