Layered FeCoNi double hydroxides with tailored surface electronic configurations induced by oxygen and unsaturated metal vacancies for boosting the overall water splitting process

Abstract

Two-dimensional (2D) layered double hydroxides (LDH) with excellent hydrophilic ability and rapid hydroxyl insertion are regarded as one type of the most promising electrocatalysts for both oxygen evolution reaction (OER)...

Regulating Ni3+ contents by a cobalt doping strategy in ternary NixCo3−xAl1-LDH nanoflowers for high-performance charge storage

“…Combined with the change of the Ni ion valence state, we can conclude that more Ni 3+ sites are obviously formed by the formation of more oxygen vacancy defects, which is consistent with what has been reported in previous studies. 30,33…”

“…Combined with the change of the Ni ion valence state, we can conclude that more Ni 3+ sites are obviously formed by the formation of more oxygen vacancy defects, which is consistent with what has been reported in previous studies. 30,33 In the Co 2p region (Fig. 4d), the two major peaks of Co 2p 3/2 at 780.8 eV and Co 2p 1/2 at 796.9 eV with a spin-energy separation of 16.1 eV showed that Co was ideally existent with Co(OH) 2 in Ni x Co 3−x Al 1 -LDH specimens.…”

Defect-rich carbon-coated nickel–cobalt alloy nanoparticles enhanced the OER catalytic activity through surface reconstruction

“…17 At present, nickel-cobalt-based electrocatalysts still have problems such as low active site density, poor electrical conductivity, and easy agglomeration. 18 The study shows that the full exposure of active metal sites and the acquisition of high-density dispersion 19 are important for effectively improving the catalytic activity of metal components and improving the utilization of metal atoms. A common strategy for this is to obtain small-sized metal nanoparticles 20 to improve the specific surface area.…”

“…17 At present, nickel–cobalt-based electrocatalysts still have problems such as low active site density, poor electrical conductivity, and easy agglomeration. 18…”

Structural engineering and electronic state tuning optimization of molybdenum-doped cobalt hydroxide nanosheet self-assembled hierarchical microtubules for efficient electrocatalytic oxygen evolution

“…Introducing other metal elements, using intermetallic interactions to adjust the Co-3d orbital electronic structure, and optimizing the adsorption energy for OER reaction intermediates is a common strategy to improve the activity of cobalt-based catalysts [22,23]. Transition metals with the same period as Co, such as Fe, Ni, etc., are widely used to develop cobalt-based catalysts [24][25][26][27]. However, their similar structure limits the space for electronic structure regulation.…”