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Metal-free pristine halloysite nanotubes: Electrochemically active and stable oxygen evolution reaction
Abstract Halloysite nanotubes (HNT) are naturally occurring one-dimensional porous clay minerals and have a unique chemical structure of kaolinite. The presence of hydroxyl functional groups on the surface of HNT is more suitable for O2 evolution reaction (OER). The HNT based electrocatalyst coated on Ni foam substrate shows excellent water oxidation activity with an overpotential of 287 mV to reach a current density of 10 mA cm−2 and have excellent stability in alkaline electrolyte solution over 32 h without any decay. The adsorption of OH− species occurs on the surface of HNT from the alkaline electrolyte via one-electron transfer, the metal cation underwent repeated oxidation and reduction reactions during the OER. This result outperforms many of the transition metal-based electrocatalysts. This work provides a new platform to use naturally abundant clay minerals as an anode material in fuel cell applications.
Graphical abstract Display Omitted
Highlights Halloysite nanotubes (HNT) is a layered tubular structure of natural clay mineral. HNT has octahedral/tetrahedral sheets of Al-O and Si-O at inner/outer surfaces. The octahedral site in HNT is beneficial for attracting of H2O molecule. HNT coated on nickel foam have superior oxygen evolution reaction activity. HNT/NF catalyst shows an overpotential of 287 mV to attain a 10 mA cm−2 in 1 M KOH.
Metal-free pristine halloysite nanotubes: Electrochemically active and stable oxygen evolution reaction
Abstract Halloysite nanotubes (HNT) are naturally occurring one-dimensional porous clay minerals and have a unique chemical structure of kaolinite. The presence of hydroxyl functional groups on the surface of HNT is more suitable for O2 evolution reaction (OER). The HNT based electrocatalyst coated on Ni foam substrate shows excellent water oxidation activity with an overpotential of 287 mV to reach a current density of 10 mA cm−2 and have excellent stability in alkaline electrolyte solution over 32 h without any decay. The adsorption of OH− species occurs on the surface of HNT from the alkaline electrolyte via one-electron transfer, the metal cation underwent repeated oxidation and reduction reactions during the OER. This result outperforms many of the transition metal-based electrocatalysts. This work provides a new platform to use naturally abundant clay minerals as an anode material in fuel cell applications.
Graphical abstract Display Omitted
Highlights Halloysite nanotubes (HNT) is a layered tubular structure of natural clay mineral. HNT has octahedral/tetrahedral sheets of Al-O and Si-O at inner/outer surfaces. The octahedral site in HNT is beneficial for attracting of H2O molecule. HNT coated on nickel foam have superior oxygen evolution reaction activity. HNT/NF catalyst shows an overpotential of 287 mV to attain a 10 mA cm−2 in 1 M KOH.
Metal-free pristine halloysite nanotubes: Electrochemically active and stable oxygen evolution reaction
Duraivel, Malarkodi (author) / Nagappan, Saravanan (author) / Park, Kang Hyun (author) / Prabakar, Kandasamy (author)
Applied Clay Science ; 219
2022-02-01
Article (Journal)
Electronic Resource
English
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