Making Ternary‐Metal Hydroxysulfide Catalyst via Cathodic Reconstruction with Ion Regulation for Industrial‐Level Hydrogen Generation

Abstract

Deep insight into electrochemical reconstruction aids in the decoding of electrocatalytic mechanisms and the development of design principles for advanced catalysts. Despite recent achievements, research concerning cathodic reconstruction is still lacking compared to the anodic variety. This work captures the electroreductive reconstruction dynamics over bimetal Ni–Mo sulfide by various in/ex situ techniques, and whereby cathodic reconstruction is steered with ion regulation to achieve a heterogeneous Ni–Mo–Fe ternary metal hydroxysulfide (NMFSOH) as a robust hydrogen‐evolving catalyst that is competent in industrial‐level water electrolysis. The thermodynamically adaptive heterosynergism in the resultant NMFSOH catalyst can coordinate water dissociation and hydrogenation for the alkaline hydrogen evolution reaction even at high current densities. A flow‐type alkaline water electrolyzer with dual NMFSOH electrodes affords an electricity consumption of 3.99 kW h Nm−3 and an electricity‐to‐hydrogen efficiency of 88.7%, manifesting its competitive cost‐effectiveness toward practical applications. This study showcases ion‐regulatory reconstruction as an effective strategy to construct high‐performance electrocatalysts.

Electronic Structure Effect of PtCo Alloy with Adjustable Compositions for Efficient Methanol Electrooxidation

“…The anodic methanol oxidation reaction (MOR) as an important half-reaction plays a crucial role in methanol-based fuel cells by enabling the direct conversion of methanol into electricity, offering high energy density, fuel efficiency, environmental benefits, and ease of refueling. − However, this oxidation process involves the six-electron transfer and the conversion of multiple intermediates, which result in sluggish reaction kinetics, which is several orders of magnitude slower than the cathodic hydrogen evolution reaction (HER). − Thereafter, the development of efficient and durable anode catalysts is crucial for fuel cell commercialization.…”

Rapid Surface Reconstruction of Te-Doped NiFe Layered Double Hydroxide for Robust Oxygen Evolution at High Current Density

“…40 The Ni 2p spectrum of NiFe LDH/NF shows two peaks at 880.63 and 862.63 eV, attributed to shakeup satellite peaks; 874.02 and 856.48 eV belong to Ni 2+ 2p 1/2 and Ni 2+ 2p 3/2 , respectively, and the peaks at 875.39 and 857.73 eV belong to Ni 3+ 2p 1/2 and Ni 3+ 2p 3/2 , respectively (Figure 5c). 42 The Fe 2p spectrum shows that the main peaks for Fe 2p 3/2 at 713.7 eV and Fe 2p 1/2 at 724.9 eV, indicating the presence of Fe 3+ (Figure 5d). 35 Especially, in comparison with NiFe LDH/NF, the Te-NiFe LDH/NF sample exhibits a negative shift in the Fe 2p peak and a positive shift in the Ni 2p peak, indicating that Te doping effectively modulates the electronic structure of metals.…”

Cr doping and heterostructure-accelerated NiFe LDH reaction kinetics assist the MoS2 oxygen evolution reaction

“…3d), two sets of peaks located at 710.82 and 713.49 eV, and 720.6 and 724.69 eV were observed to be the 2p 3/2 and 2p 1/2 peaks for Fe 2+ and Fe 3+ , respectively. 45–47 The 2p 3/2 binding energies of Fe 2+ and Fe 3+ in NiFeCr LDH exhibited a negative shift of 0.24 eV when compared to NiFe LDH. This suggests that the doping of Cr 3+ contributed to increased interactions of the electrons around the Fe ions.…”