Designing cactus-like Fe-P doped CoNi-S arrays as highly efficient electrocatalyst for overall water splitting

다국어 초록 (Multilingual Abstract)

Exploring high activity, stable and low-cost electrocatalysts are of great importance for high-efficienthydrogen production via water splitting. Herein, a cactus-like Fe, P co-doped CoNi-S arraywas constructedvia facile hydrothermal reaction and subsequently sulfuration and phosphorization process. Benefitingfrom the strong synergistic effects of different components, high conductivity of bimetallic sulfide, 3Dcactus-like architecture with rich channels for mass/charge transport, and Fe and P co-doping with electronstructure regulation, the as-prepared Fe, P-NiCo2S4/NF presents superior electrocatalytic activity withlow overpotentials of 139 and 290 mV to drive the current density of 10 and 40 mA cm2 for HER and OER,respectively. Meanwhile, it also manifests the distinguished durability for over 60 h in alkaline media.
Notably, when integrating in a two-electrode electrolytic cell with Fe, P-CoNi-S, a reduced operation voltageof 1.55 V is required to reach 10 mA cm2, which is superior to precious metal-based Pt/C/NF//RuO2/NFcounterparts. Impressively, it can also be driven by sustainable solar and thermal energies motivatedStirling engine. This work offers a universal strategy for designing high-activity and durable electrocatalystsby dual doping heteroatoms and synergistic interface engineering.