1. Synthesis of NiFeOx nanocatalysts from metal–organic precursors for the oxygen evolution reaction.
- Author
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Nguyen, Quyen T., Robert, Francois, Colliere, Vincent, Lecante, Pierre, Philippot, Karine, Esvan, Jérome, Tran, Phong D., and Amiens, Catherine
- Subjects
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OXYGEN evolution reactions , *HYDROGEN evolution reactions , *OXIDATION of water , *NANOPARTICLE size , *SUSTAINABLE development , *HYDROGEN production - Abstract
Production of hydrogen from a renewable source that is water requires the development of sustainable catalytic processes. This implies, among others, developing efficient catalytic materials from abundant and low-cost resources and investigating their performance, especially in the oxidation of water as this half-reaction is the bottleneck of the water splitting process. For this purpose, NiFe-based nanoparticles with sizes ca. 3–4 nm have been synthesized by an organometallic approach and characterized by complementary techniques (WAXS, TEM, STEM-HAADF, EDX, XPS, and ATR-FTIR). They display a Ni core and a mixed Ni–Fe oxide shell. Once deposited onto FTO electrodes, they have been assessed in the electrocatalytic oxygen evolution reaction under alkaline conditions. Three different Ni/Fe ratios (2/1, 1/1 and 1/9) have been studied in comparison with their monometallic counterparts. The Ni2Fe1 nanocatalyst displayed the lowest overpotential (320 mV at j = 10 mA cm−2) as well as excellent stability over 16 h. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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