Catalysis

Enhancement of Electrocatalytic Oxygen Evolution by Chiral Molecular Functionalization of Hybrid 2D Electrodes

Authors

  • Yunchang Liang Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland; Institut of Physics (IPHYS), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland ,
  • Karla Banjac Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland; Institut of Physics (IPHYS), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland ,
  • Kévin Martin Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France ,
  • Nicolas Zigon Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France ,
  • Seunghwa Lee Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland ,
  • Nicolas Vanthuyne Aix Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille, France ,
  • Felipe Andrés Garcés Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, E-43007 Tarragona, Spain ,
  • José R. Galan-Mascaros Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Av. Països Catalans 16, E-43007 Tarragona, Spain; Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Com-panys, 23, Barcelona 08010, Spain ,
  • Xile Hu Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland ,
  • Narcis Avarvari Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France ,
  • Magalí Lingenfelder Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland; Institut of Physics (IPHYS), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland

Abstract

A sustainable future requires highly efficient energy conversion and storage processes, where electrocatalysis plays a crucial role. The activity of an electrocatalyst is governed by the binding energy towards the reaction intermediates, while the scaling relationships prevent the improvement of a catalytic system over its volcano-plot limits. To overcome these limitations, unconventional methods that are not fully determined by the surface binding energy can be helpful. Here, we use organic chiral molecules, i.e., hetero-helicenes, to boost the oxygen evolution reaction (OER) by ca. 131.5 % (at the potential of 1.65 V vs. RHE) at state-of-the-art 2D catalysts via a spin-polarization mechanism. Our results show that chiral molecule-functionalization is able to increase the OER activity of catalysts beyond the volcano limits. A guideline for optimizing the catalytic activity via chiral molecular functionalization of hybrid 2D electrodes is given.

Content

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Supplementary material

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Supplementary information: Enhancement of Electrocatalytic Oxygen Evolution by Chiral Molecular Functionalization of Hybrid 2D Electrodes
Additional electrochemical measurements, STM images, and synthesis procedure of helicene molecules including the reaction scheme, full experimental details, characterization, chiral HPLC separation and X-ray diffraction analysis details.