Superaerophobic Quaternary Ni–Co–S–P Nanoparticles for Efficient Overall Water-Splitting

Abstract

The aggravation of environmental problems leads to an increasing demand for clean hydrogen fuel. Simplification of the synthesis process is the key to realize mass production. In this work, quaternary Ni–Co–S–P nanoparticles (NPs) were directly grown on carbon fiber cloth via a summary one-step electrodeposition process. The interconnected nanoparticles are instrumental in increasing the specific surface area and accelerating mass transfer, thus enhancing the electrocatalytic overall water-splitting performance. Moreover, their superhydrophilic and superaerophobic properties could facilitate the diffusion of medium and the rapid delivery of the generated bubble. As a result, bifunctional Ni–Co–S–P nanoparticles (NPs) achieve a current density of 10 mA cm–2 at low overpotentials of 280 and 78 mV for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively, along with the Tafel slopes of 69 and 89 mV dec–1. Besides, the Ni–Co–S–P displays an excellent performance with a cell voltage of 1.61 V to reach 10 mA cm–2 for overall water-splitting. Moreover, benefiting from the superhydrophilic and superaerophobic characteristics, Ni–Co–S–P also exhibits robust stability and durability for both the OER and HER. This paper provides a new idea for simplifying the synthesis process of electrocatalysts.

Interface Engineering of Hierarchical Branched Mo‐Doped Ni3S2/NixPy Hollow Heterostructure Nanorods for Efficient Overall Water Splitting

“…This proves that the doped double‐anion heterostructure synthesized by introducing molybdenum and phosphorus sources can lead to higher reaction rate and faster kinetics for water oxidation. [ 22 ] Electrochemical impedance spectroscopy (EIS) of samples (Figure 3d) exhibits that compared with Ni 3 S 2 /NF and Mo‐Ni 3 S 2 ‐0.2/NF, Mo‐Ni 3 S 2 /Ni x P y /NF possesses remarkably low charge‐transfer resistance, suggesting an expeditious charge transfer. To further probe the intrinsic activity of the electrocatalysts, the electrochemical surface area (ECSA) was estimated by the double‐layer capacitance ( C dl ).…”

Modifying the 316L stainless steel surface by an electrodeposition technique: towards high-performance electrodes for alkaline water electrolysis

“…79,80 The deconvolution of the high-resolution Ni 2p spectrum of Ni@SS (Fig. 3b) exhibits a peak at 852.68 eV, which was assigned to the zero-oxidation state of nickel (Ni 0 ); 27,81,82 and doublet peaks of Ni 2+ peaks (855.56 and 873.19 eV) and Ni 3+ peaks (857.61 and 875.4 eV) due to the surface oxidation of metallic nickel when exposed to air; 83–85 and the other three peaks at around 860.95, 863.21, and 879.39 eV can be assigned to the satellite peaks of the oxidized Ni species (labelled as “Sat.”). 81,86,87 Remarkably, the binding energies of Ni 2p peaks for 15NiP@SS shift positively compared with those of pure Ni@SS (≈0.34 and ≈0.35 eV for Ni 2p 3/2 and Ni 2p 1/2 , respectively) and the peak at about 853.05 eV is assigned to Ni δ + (0 < δ < 2) in 15NiP@SS.…”

Gas–Liquid–Solid Triphase Interfacial Chemical Reactions Associated with Gas Wettability

“…In 2019, Wang and co-workers prepared quaternary Ni-Co-S-P NPs with a large specific surface area for quick mass transport as well as the superaerophobic surface to facilitate the rapid delivery of generated bubbles (Figure 11o, inset). [79] As a result, Ni-Co-S-P NPs displayed the overpotential of 78 mV at 10 mA cm -2 in the acidic condition for the HER (Figure 11j). Also, it showed prominent OER performance with the overpotential of 280 mV at 10 mA cm -2 in 1 m KOH ( Figure 11k) as well as overall water splitting activity with the low cell voltage of 1.61 V at 10 mA cm -2 (Figure 11l).…”