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Partial sulfurization enabled SO42- decorated NiFe2O4 for enhanced electrocatalytic urea oxidation
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DOI：10.1016/j.mseb.2025.118228.png)
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Abstract
En 中文
Urea-assisted water splitting for hydrogen production is an emerging technology, but developing efficient urea oxidation reaction (UOR) electrocatalysts remains challenging. Hence, the nonmetallic anionic group SO4 2decorated NiFe2O4 (Sx-NiFe2O4) catalyst is cleverly designed via a facile one-pot co-precipitation process followed by a sulfurization strategy. The decoration with SO4 2- not only increased the high-valent Ni content and active sites in the catalyst but also significantly improved its hydrophilicity and stability. With the optimal sulfurization amount, S0.5-NiFe2O4 only 1.48 V is sufficient to achieve 100 mA cm-2 and staggering mass activity of 5.6 A cm-2 mg- 1 at 1.6 V. Strikingly, the overall urea electrolyzer with S0.5-NiFe2O4 anode only requires 1.59 V to drive a current density of 50 mA cm- 2 and maintains stably for 100h at a current density of 10 mA cm- 2. Besides, this urea overall splitting system can be powered by a 1.5 V voltaic battery. This study provides a strategy for designing UOR catalysts with high catalytic performance from the aspect of taking advantage of nonmetallic anionic groups.
Keywords:
Sulfates
Urea oxidation reaction
Electrocatalyst
Urea overall splitting
Journal
M
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