Deep Reconstruction of the NiFeSP Nanosheet Catalyst for Large Current–Density Water Oxidation

Interface Enables Faster Surface Reconstruction in a Heterostructured CuSey/NiSex Electrocatalyst for Realizing Urea Oxidation

“…12,13 The study examines the surface crystal structure changes of the CuSe x / NiSe y /NF electrode during urea oxidation by in-situ Raman spectroscopy. 43,44 As seen in Figure 5a, prior to the applied potential, the Raman peaks at 223 and 246 cm −1 were identified as Se−Se in CuSe x /NiSe y /NF, 45−48 while the peak at 488 cm −1 corresponds to Ni−O vibrations of Ni(OH) 2 . 42 Moreover, the symmetric C−N stretch of urea is correlated to a peak at 1003 cm −1 , whereas the bending vibration mode of H−O−H in water is linked to the peak at 1635 cm −1 .…”

“…When the anodic reaction occurs, metal-based selenides might experience surface self-reconstruction, resulting in the formation of a thin oxide/hydroxide layer. , The study examines the surface crystal structure changes of the CuSe x /NiSe y /NF electrode during urea oxidation by in-situ Raman spectroscopy. , As seen in Figure a, prior to the applied potential, the Raman peaks at 223 and 246 cm –1 were identified as Se–Se in CuSe x /NiSe y /NF, − while the peak at 488 cm –1 corresponds to Ni–O vibrations of Ni­(OH) 2 . Moreover, the symmetric C–N stretch of urea is correlated to a peak at 1003 cm –1 , whereas the bending vibration mode of H–O–H in water is linked to the peak at 1635 cm –1 . , It is intriguing that as the voltage rises, the Raman peaks of Se–Se bonds start to weaken as they partially convert to hydroxide and Se leaches from the core surface into the electrolyte, while the peaks of Ni–O grow stronger.…”

Electronic Structure Modulation Via Iron-Incorporated NiO to Boost Urea Oxidation/Oxygen Evolution Reaction

“…The advantages of hydrogen energy, including its high energy density and environmental friendliness, position it as an exemplary clean energy source. − However, the challenge lies in efficiently and expeditiously obtaining hydrogen energy. Hydrogen production from water electrolysis or seawater electrolysis is known as an ideal method to efficiently obtain hydrogen energy, encompassing the cathodic hydrogen evolution reaction (HER) and the anodic oxygen evolution reaction (OER). − However, due to the four-proton coupled electron transfer process involved in the anodic oxygen evolution reaction, its rate is hindered, thereby reducing the efficiency of water electrolysis for hydrogen energy generation. − Consequently, exploring alternative anode reactions represents a viable approach to address this current challenge.…”