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Undoped SnO2 as a Support for Ni Species to Boost Oxygen Generation through Alkaline Water Electrolysis
- Ştefan NeaţuŞtefan NeaţuNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaMore by Ştefan Neaţu
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- Florentina NeaţuFlorentina NeaţuNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaMore by Florentina Neaţu
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- Victor C. DiculescuVictor C. DiculescuNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaMore by Victor C. Diculescu
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- Mihaela M. TrandafirMihaela M. TrandafirNational Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaMore by Mihaela M. Trandafir
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- Nicoleta PetreaNicoleta PetreaScientific Research Centre for CBRN Defence and Ecology, 225 Oltenitei Road, 041309 Bucharest, RomaniaMore by Nicoleta Petrea
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- Simona SomacescuSimona Somacescu“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, RomaniaMore by Simona Somacescu
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- Frank KrumeichFrank KrumeichETH Zurich, Institute for Chemical and Bioengineering, 8093 Zurich, SwitzerlandMore by Frank Krumeich
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- Julian T. C. WennmacherJulian T. C. WennmacherETH Zurich, Institute for Chemical and Bioengineering, 8093 Zurich, SwitzerlandPaul Scherrer Institute, 5232 Viligen, SwitzerlandMore by Julian T. C. Wennmacher
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- Amy J. KnorppAmy J. KnorppETH Zurich, Institute for Chemical and Bioengineering, 8093 Zurich, SwitzerlandMore by Amy J. Knorpp
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- Jeroen A. van BokhovenJeroen A. van BokhovenETH Zurich, Institute for Chemical and Bioengineering, 8093 Zurich, SwitzerlandPaul Scherrer Institute, 5232 Viligen, SwitzerlandMore by Jeroen A. van Bokhoven
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- Mihaela Florea*Mihaela Florea*Email: [email protected]National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, RomaniaMore by Mihaela Florea
Abstract
In this study, the synergistic behavior of Ni species and bimodal mesoporous undoped SnO2 is investigated in oxygen evolution reactions (OERs) under alkaline conditions without any other modification of the compositional phases or using noble metals. An efficient and environmentally friendly hydrothermal method to prepare bimodal mesoporous undoped SnO2 with a very high surface area (>130 m2 g–1) and a general deposition–precipitation method for the synthesis of well-dispersed Ni species on undoped SnO2 are reported. The powders were characterized by adsorption–desorption isotherms, TG-DTA, XRD, SEM, TEM, Raman, TPR-H2, and XPS. The best NiSn composite generates, under certain experimental conditions, a very high TOF value of 1.14 s–1 and a mass activity higher than 370 A g–1, which are remarkable results considering the low amount of Ni deposited on the electrode (3.78 ng). Moreover, in 1 M NaOH electrolyte, this material produces more than 24 mA cm–2 at an overpotential value of approximately +0.33 V, with only 5 wt % Ni species. This performance stems from the dual role of undoped SnO2, on the one hand, as a support for active and well-dispersed Ni species and on the other hand as an active player through the oxygen vacancies generated upon Ni deposition.
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