Abstract
Alkaline overall water splitting (OWS) is a potential technology for hydrogen (H2) production, however, the sluggish oxygen evolution reaction (OER) with high overpotential has limited its large-scale application. Herein, we successfully prepared the macroporous NiFe layered hydroxide (M-NiFe-LDH) on self-supported carbon cloth (CC) as electrocatalyst to drive an energy-saving device for both H2 production and benzyl alcohol (BA) oxidation to synthesize benzaldehyde (BAD). By utilizing the polystyrene (PS) microsphere templates and electrodeposition technology, CC@M-NiFe-LDH can be easily obtained after removing the PS templates. Due to the synergistic effect of bimetallic NiFe-LDH and macropores arrays which can expose more catalytic active sites, CC@M-NiFe-LDH electrocatalyst only needs a low potential of 1.31 VRHE to reach the current density of 10 mA cm−2 with a high BAD selectivity (∼99 %). Consequently, an energy-saving two-electrode device with both BAD electrosynthesis and H2 production can be assembled, which needs a low cell voltage of 1.648 V and electricity consumption of 3.60 kW h per cubic meter of H2, lower than that of OWS (1.826 V and 3.99 kW h).
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