NiMn layered double hydroxide nanosheets/NiCo2O4 nanowires with surface rich high valence state metal oxide as an efficient electrocatalyst for oxygen evolution reaction

Carbon Dots Integrated NiCo2O4 Hierarchical Nanoneedle Arrays Supported on Ni Foam as Efficient and Stable Electrode for Hydrogen and Oxygen Evolution Reactions

“…Additionally, the Tafel slope of NCCD25 is significantly smaller than those of other samples, indicating favorable OER reaction kinetics of NCCD25 [49]. Furthermore, in accord with the OER activity NCCD25, its Rct value (Table S1) is also lower than others, implying a fast Faradic process and higher charge-transfer ability in this case (Figure 6d) [50][51]. The improved electron transfer may be attributed to the strong electrical contact between the CDs and NiCo 2 O 4 .…”

Fluoridated Iron–Nickel Layered Double Hydroxide for Enhanced Performance in the Oxygen Evolution Reaction

“…[6,18] Moreover, driven by the surfacep assivation of metalÀFb onds in the strong alkaline solutiona nd electrochemical chemical oxidation at ah ighp otential, surface corrosion was reduced in the strong alkaline conditions to maintain high catalytic OER performance. Specifically,c ompared with FeNi-LDHs, ap otentialo f9 1mVi sr educed to drive 10 mA cm À2 for OER.…”

“…Accordingt ot he OER mechanism on transition-metal-based electrodes, the high-valencem etal oxide is involved in the OER catalytic process, andt he facile formation of metal (oxy)hydroxide/oxide over the catalysts urface is highly desired. [6,18] Moreover, driven by the surfacep assivation of metalÀFb onds in the strong alkaline solutiona nd electrochemical chemical oxidation at ah ighp otential, surface corrosion was reduced in the strong alkaline conditions to maintain high catalytic OER performance. The current work reports an ew avenue to boost the catalytic performance of LDH-based catalysts forO ER by as imple fluoridation approach.…”

“…[3] It is, in essence, ap rocess for the oxidation of water molecules or hydroxy groups, and the facile formation of high-valencem etal oxy/hydroxides is significant for the re-action. [5] Nevertheless, restricted by the limiteda ctive sites exposed in the bulk materiala nd poor electrical conductivity,p ure LDHs are still far from satisfactory.E xfoliation, integration,o rh ybridization with other active materials [6] or conductive substrates [7] have been performed to address these issues in recent years, although the operational complexity and high price make these methods not widely available in production.F or instance, NiCo-LDH directly grown onto carbon paper can drive the benchmark current density of 10 mA cm À2 for OER with al ow overpotential of 367 mA cm À2 . [5] Nevertheless, restricted by the limiteda ctive sites exposed in the bulk materiala nd poor electrical conductivity,p ure LDHs are still far from satisfactory.E xfoliation, integration,o rh ybridization with other active materials [6] or conductive substrates [7] have been performed to address these issues in recent years, although the operational complexity and high price make these methods not widely available in production.F or instance, NiCo-LDH directly grown onto carbon paper can drive the benchmark current density of 10 mA cm À2 for OER with al ow overpotential of 367 mA cm À2 .…”

“…[4] Layeredd ouble hydroxides (LDHs), which contain positively charged metal hydroxide layers and compensating anions, are very promising catalysts for the OER. [5] Nevertheless, restricted by the limiteda ctive sites exposed in the bulk materiala nd poor electrical conductivity,p ure LDHs are still far from satisfactory.E xfoliation, integration,o rh ybridization with other active materials [6] or conductive substrates [7] have been performed to address these issues in recent years, although the operational complexity and high price make these methods not widely available in production.F or instance, NiCo-LDH directly grown onto carbon paper can drive the benchmark current density of 10 mA cm À2 for OER with al ow overpotential of 367 mA cm À2 . [8] The overpotential can be reduced to 300 mV to provide 10 mA cm À2 ,a sr eportedb yS ong and Hu, by using the single-layer NiFe-LDHs obtained from novel liquid-phase exfoliation to enhancet he number of exposed active sites.…”