Copper-Substituted NiTiO3 Ilmenite-Type Materials for Oxygen Evolution Reaction
- Amandine GuietAmandine GuietInstitut des Molécules et Matériaux du Mans, UMR 6283 CNRS, Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, FranceMore by Amandine Guiet,
- Tran Ngoc HuanTran Ngoc HuanLaboratoire de Chimie des Processus Biologiques, Collège de France, UMR CNRS 8229, Sorbonne Université, PSL Research University, 11 place Marcelin Berthelot, 75005 Paris, FranceMore by Tran Ngoc Huan,
- Christophe PayenChristophe PayenInstitut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes cedex 3, FranceMore by Christophe Payen,
- Florence PorcherFlorence PorcherLaboratoire Léon Brillouin, CEA-CNRS, 91191 Gif-sur-Yvette Cedex, FranceMore by Florence Porcher,
- Victor MougelVictor MougelLaboratoire de Chimie des Processus Biologiques, Collège de France, UMR CNRS 8229, Sorbonne Université, PSL Research University, 11 place Marcelin Berthelot, 75005 Paris, FranceMore by Victor Mougel,
- Marc Fontecave* , and
- Gwenaël Corbel*
Single Ni1–xCuxTiO3 (0.05 ≤ x ≤ 0.2) Ilmenite-type phases were successfully prepared through a solid-state reaction route using divalent metal nitrates as precursors and characterized. Their electrocatalytic performance for oxygen evolution reaction (OER) in alkaline media is presented. The Cu content was determined (0.05 ≤ x ≤ 0.2) by X-ray diffraction. A thorough powder neutron diffraction study was carried out to identify the subtle changes caused by copper substitution in the structure of NiTiO3. The evolution of the optical and magnetic properties with the Cu content was also investigated on the raw micrometer-sized particles. A reduction in particle size down to ≈15 nm was achieved by ball-milling the raw powder prepared by the solid-state reaction. The best catalytic activity for OER was obtained for nanometer-sized particles of Ni0.8Cu0.2TiO3 drop-casted on the Cu plate. For this electrode, a current density of 10 mA cm–2 for oxygen production was generated at 345 and 470 mV applied overpotentials with 1 and 0.1 M NaOH solutions as electrolytes, respectively. The catalyst retained this OER activity at 10 mA cm–2 for long-term electrolysis with a faradic efficiency of 90% for O2 production in a 0.1 M NaOH electrolyte.
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