NiCo-BDC derived Co3+ enriched NiCoxOy/NF nanosheets for oxygen evolution reaction

Guo, Guangkai; Zhong, Dazhong; Zhao, Tao; Liu, Guang; Li, Jinping; Zhao, Qiang

doi:10.1016/j.ijhydene.2022.05.115

Cited by 8 publications

(2 citation statements)

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“…It was reported that the presence of Co 3+ would boost the OER activity. 52,67 Chen et al claimed that the higher ratio of Co 3+ /Co 2+ obtained for their CoZn-NC-700 besides higher pyridinic-N content would promote OER, which was confirmed by the lowest overpotential of CoZn-NC-700 (390 mV) compared to CoZn-NC-600 (590 mV), CoZn-NC-800 (480 mV), and CoZn-NC-900 (510 mV). 52 In addition, many studies revealed that nitrogen-doped carbon materials exhibit superior charge transfer, boosting the catalytic activity in electrochemical reactions.…”

Section: Chemicals and Materialsmentioning

confidence: 94%

MOF-Derived Cobalt@Mesoporous Carbon as Electrocatalysts for Oxygen Evolution Reaction: Impact of Organic Linker

et al. 2023

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Water electrolysis has attracted scientists' attention as a green route for energy generation. However, the sluggish kinetics of oxygen evolution reaction (OER) remarkably increases the reaction overpotential. In this work, we developed Co-based nanomaterials as cost-effective, highly efficient catalysts for OER. In this regard, different Co-based metal−organic frameworks (MOFs) were synthesized using different organic linkers. After annealing under inert atmosphere, the corresponding Co-embedded mesoporous carbon (Co/MC) materials were produced. Among them, Co/MC synthesized using 2-methyl imidazole (Co/NMC-2MeIM) expressed the highest surface area (412 m 2 /g) compared to its counterparts. Furthermore, it expressed a higher degree of defects as depicted by Raman spectra. Co/NMC-2MeIM exhibited the best catalytic performance toward OER in alkaline medium. It afforded an overpotential of 292 mV at a current density of 10 mA cm −2 and a Tafel slope of 99.2 mV dec −1 . The superior electrocatalytic performance of Co/NMC-2MeIM is attributed to its high content of Co 3+ on the surface, high surface area, and enhanced electrical conductivity induced by nitrogen doping. Furthermore, its high content of pyridinic-N and high degree of defects remarkably enhance the charge transfer between the adsorbed oxygen species and the active sites. These results may pave the avenue toward further investigation of metal/carbon materials in a wide range of electrocatalytic applications.

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