MIL-88A derived CoFe-layered double hydroxides with optimized composition for the enhanced electrocatalytic oxygen evolution reaction

Abstract

The oxygen evolution reaction (OER) as the anodic half-reaction of water electrolysis has received growing attention due to its paramount role in the green and sustainable production of hydrogen fuel...

CoFe layered double hydroxides with adjustable composition and structure for enhanced oxygen evolution reaction

“…4b). [53][54][55] The absorption peaks at 3450 cm À1 and 1550 cm À1 were attributed to the O-H stretching and H-OH bending vibrations of water molecules, respectively. The absorption peak between 1200 cm À1 and 1760 cm À1 corresponded to C-O in carbonate ions or N-O in nitrate ions.…”

Electrodeposited CoNi-LDH nanosheets supported on halloysite nanotubes as a robust and highly efficient electrocatalyst for water oxidation

“…The improved OER performance of the CoNi/H-2 can be ascribed to the optimized electronic interactions between Co and Ni. 36 This is supported by the fact that in the structure of LDH, the metal ions are electronically connected through linking oxygen atoms (from OH À ). 86 The molar ratio of M II (divalent metal) to M III (trivalent metal) in the LDH structure can significantly influence the filling of the 3d-orbital and electronic states of the M II and M III species, which are crucial factors in determining the catalytic activity towards the OER.…”

“…86 The molar ratio of M II (divalent metal) to M III (trivalent metal) in the LDH structure can significantly influence the filling of the 3d-orbital and electronic states of the M II and M III species, which are crucial factors in determining the catalytic activity towards the OER. 36,87 However, additional theoretical and experimental investigations are required to fully understand the reasons behind the improved OER performance of the CoNi/H-2.…”

“…32 Notably, layered-double hydroxides (LDHs) have become prominent as particularly innovative and promising catalysts for the OER. [33][34][35][36] LDHs refer to a class of two-dimensional clays that consist of sheets with a positive charge featuring brucite-like structures. These sheets are intercalated with various anions, including Cl À , CO 3 2À , NO 3 À , and SO 4 2À , along with water molecules.…”