Amorphous-microcrystalline heterostructured high-entropy oxysulfide/cerium oxide with strong electronic communication to boost water/simulated seawater splitting
Year: 2025
Type: article
Abstract: Exploring bifunctional transition metal-based oxysulfide with high activities, corrosion resistance and reaction selectivity is a promising strategy to realize efficient water/seawater splitting. Here, amorphous , high entropy and heterostructure strategies are coupled to construct the amorphous-microcrystalline heterostructured high-entropy oxysulfide/cerium oxide (a-NiCoFeOS/c-CeO 2 ) by one-step intermittent electrodeposition . With the strong interfacial electronic communication, a-NiCoFeOS/c-CeO 2 shows high bifunctional activities with low overpotentials for hydrogen evolution reaction (47/63 mV) and oxygen evolution reaction (216/220 mV) at 10 mA cm −2 in alkaline water/simulated seawater , respectively. The a-NiCoFeOS/c-CeO 2 (+, −)-assembled electrolyzers require low cell voltages of 1.54/1.58 V to attain the current density of 10 mA cm −2 for overall alkaline water/simulated seawater splitting. Moreover, a-NiCoFeOS/c-CeO 2 exhibits strong activity retention and high Faradaic efficiency in alkaline water/simulated seawater. Significantly, a-NiCoFeOS/c-CeO 2 (+, −) tolerates the industrial alkaline water splitting condition (500 mA cm −2 in 6 M KOH @ 60 °C) with a strong durability of 210 h. Surface-reconstructed Ni/Co/Fe-based hydroxides/oxyhydroxides guarantee the high activity retention during the stability testing. The permiselective c-CeO 2 and adsorbed sulfate enhance reaction selectivity and corrosion resistance by the inhibition of Cl − approach. Herein, an innovative strategy is proposed for construction of efficient water/seawater electrocatalysts , showing great potential for industrial application.
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,250
Awards: G158863123, G9000218197
OpenAlex ID: W4409260622