Improved water electrolysis using magnetic heating of FeC–Ni core–shell nanoparticles View Full Text


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Article Info

DATE

2018-06

AUTHORS

Christiane Niether, Stéphane Faure, Alexis Bordet, Jonathan Deseure, Marian Chatenet, Julian Carrey, Bruno Chaudret, Alain Rouet

ABSTRACT

Water electrolysis enables the storage of renewable electricity via the chemical bonds of hydrogen. However, proton-exchange-membrane electrolysers are impeded by the high cost and low availability of their noble-metal electrocatalysts, whereas alkaline electrolysers operate at a low power density. Here, we demonstrate that electrocatalytic reactions relevant for water splitting can be improved by employing magnetic heating of noble-metal-free catalysts. Using nickel-coated iron carbide nanoparticles, which are prone to magnetic heating under high-frequency alternating magnetic fields, the overpotential (at 20 mA cm−2) required for oxygen evolution in an alkaline water-electrolysis flow-cell was decreased by 200 mV and that for hydrogen evolution was decreased by 100 mV. This enhancement of oxygen-evolution kinetics is equivalent to a rise of the cell temperature to ~200 °C, but in practice it increased by 5 °C only. This work suggests that, in the future, water splitting near the equilibrium voltage could be possible at room temperature, which is currently beyond reach in the classic approach to water electrolysis. Electrocatalytic water splitting to produce H2 is impeded by slow reaction kinetics over noble-metal-free catalysts at the electrodes. Here, the authors use high-frequency alternating magnetic fields to locally heat FeC–Ni core–shell catalysts, enhancing the kinetics of the oxygen and hydrogen evolution reactions. More... »

PAGES

476-483

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41560-018-0132-1

DOI

http://dx.doi.org/10.1038/s41560-018-0132-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1103931834


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