Journal
CHEMICAL ENGINEERING JOURNAL
Volume 463, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.142314
Keywords
Ammonia oxidation reaction; Nickel Phosphide; N -doped carbon; Hydrogen production; Microspheres
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Nickel phosphide supported on nitrogen-doped carbon (Ni2P@N-C) is a bifunctional electrocatalyst that can efficiently decompose ammonia and produce hydrogen in an electrolysis cell with low energy consumption.
Ammonia, as an efficient hydrogen carrier, is emerging as an alternative energy resource to replace fossil fuels in the carbon-neutral era. Hydrogen production by water electrolysis seeks a lower potential dependent anodic reaction to overcome its energy-inefficiency that originates from the high potential anodic oxygen evolution reaction (OER). In this work, nickel phosphide supported on nitrogen doped-carbon (Ni2P@N-C) was prepared by one-pot synthesis for the bifunctional activity of hydrogen evolution (HER) and ammonia oxidation (AOR) re-actions. The Ni2P@N-C electrocatalyst exhibits about 78% decomposition of ammonia compared to the initial concentration. The amount of hydrogen generated in a 0.5 M ammonia environment for 30 min is about 2.144 mmol(H-2)/mol(NH3) h cm(2). The fabricated ammonia electrolysis cell demonstrates a comparatively low energy consumption rate of 8.611 KWHkg((H2))(-1). Thus, engineering a bifunctional electrocatalyst for a low potential anode oxidation reaction and the cathodic HER is a promising strategy to fabricate an energy efficient electrolysis cell for hydrogen production with a low cell potential requirement.
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