Hierarchical bimetallic iron-cobalt phosphides nano-island nanostructures for improved oxygen evolution reaction

Shankar, Ayyavu; Maduraiveeran, Govindhan

doi:10.1016/j.jelechem.2022.116806

Cited by 6 publications

(1 citation statement)

References 80 publications

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“…Nickel-based LDHs, such as NiFe-LDH, NiCo-LDH, NiMn-LDH, NiCr-LDH, NiTi-LDH, and NiV-LDH, have received particular attention due to their abundance, corrosion resistance, and good ductility . Besides nickel-based materials, cobalt-based electrocatalysts are identified to be the best non-noble metal electrocatalysts for oxygen evolution reactions. − Generally, the surface area of cobalt-based electrocatalysts can be efficiently improved by adjusting their morphologies, and the active sites in the electronic structure and conductivity could possibly be altered by doping with non-metallic elements, which improves the performance of electrocatalysts. − Several cobalt-based electrocatalysts, such as chalcogenides, − oxides, phosphides, metal–organic frameworks (MOFs), and layered double hydroxides (LDHs), have been applied as promising materials due to their similar or even higher electrochemical stability compared to the noble metals (Pt, Ir, and Ru) . Moreover, carbon-supported cobalt has shown even better activities than bare electrocatalysts, such as Vulcan XC-72, multiwalled carbon nanotubes doped with nitrogen, graphene analogues, etc.…”

Section: Introductionmentioning

confidence: 99%

Copper-Doped Cobalt Oxychloride for Efficient Oxygen Evolution Reactions in an Alkaline Medium

Shamraiz

Badshah

Ain

2023

ACS Appl. Energy Mater.

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The development of cost-effective and stable cobalt-based electrodes for oxygen evolution reaction (OER) from water at a lower overpotential is a major challenge. In this work, we report the fabrication of cobalt-based oxychlorides and their substitution with copper to enhance stability and improve OER activity. The substation of Cu not only affects the overpotential but also suppresses the in situ conversion of Co 2+ into Co 3+ in an electrochemical environment. The synthesized material is characterized by powder X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray mapping, and X-ray photoelectron spectroscopy (XPS) analyses. The Cu•Co 2 (OH) 3 Cl requires an overpotential of 230 mV to obtain a current density of 10 mA cm −2 and a Tafel slope of merely 53 mV dec −1 . Moreover, the binding energy of Co 2p in XPS is slightly shifted toward lower binding energy values due to the alteration of the cation distribution at the lattice when Cu 2+ replaces Co 2+ .

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