Oxygen Evolution Reaction of Amorphous/Crystalline Composites of NiFe(OH)_x/NiFe₂O₄

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Orbital structures are strongly correlated with catalytic performance, whereas their regulation strategy is still in pursuit. Herein, the Fe 3d and O 2p orbital hybridization was optimized by controlling content of amorphous NiFe(OH)x (a-NiFe(OH)x), which grown situ on crystalline NiFe2O4 (c-NiFe2O4) using an ultrasonic reduction method. The results electron energy loss spectroscopy (EELS) X-ray absorption spectra (XAS) revealed that Fe-Oa a-NiFe(OH)x effectively strengthened jointing adjacent oxygen (Oc) c-NiFe2O4, further confirmed higher antibonding energies based density functional theory (DFT) calculations. resultant Oa-Fe-Oc at composite interface leads to balanced adsorption desorption energies. Accordingly, optimal strong 3d-O enhanced OER overpotential 150 mV, lower than pristine sample. This work represents a promising approach via introduction phase construct highly efficient catalysts.

Language: Английский

In Situ Raman Study of Layered Double Hydroxide Catalysts for Water Oxidation to Hydrogen Evolution: Recent Progress and Future Perspectives

Energies, Journal Year: 2024, Volume and Issue: 17(22), P. 5712 - 5712

Published: Nov. 15, 2024

With the increasing global emphasis on green energy and sustainable development goals, electrocatalytic oxygen evolution reaction (OER) is gradually becoming a crucial focus in research water oxidation for hydrogen generation. However, its complicated processes associated with high barrier severely limit efficiency of conversion. Recently, layered double hydroxide (LDH) has been considered as one most promising catalysts alkaline media. Nonetheless, lacking deep insight into kinetic process OER detrimental to further optimization LDH catalysts. Therefore, monitoring catalytic via surface-sensitive situ spectroscopy especially important. In particular, Raman technique capable providing fingerprint information surface species intermediates operating environment. From perspective spectroscopy, this paper provides an exhaustive overview progress characterization mechanism catalysts, theoretical guidance designing materials. Finally, we present incisive discussion challenges future trend.

Language: Английский

A Core–Shell Nanocomposite of Borate Anion-Intercalated NiCoFe-LDH Nanoflakes/Co-BNC Nanorods for Efficient Electrocatalytic Oxygen Evolution

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 26, 2025

Language: Английский