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One-dimensional hierarchical nanostructures of NiCo 2 O 4 , NiCo 2 S 4 and NiCo
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Abstract
Oxygen evolution reaction (OER), a sluggish multistep process in electrochemical water splitting, is still a challenging issue to achieve with cheap, earth-abundant non-precious and non-polluting materials. In this work, three different electrocatalysts, specifically NiCo
2
O
4
, NiCo
2
S
4
, and NiCo
2
Se
4,
synthesized by simple hydrothermal process, show excellent OER activity. This report not only projects OER performances but also demonstrates a modified method for the transformation of NiCo
2
O
4
to NiCo
2
S
4
and NiCo
2
Se
4
via sulfidation and selenization reactions. The well crystalline, porous nature of NiCo
2
O
4
, NiCo
2
S
4
, and NiCo
2
Se
4
electrocatalysts with one dimensional (1D) structural morphology affords overpotentials of 346 mV, 309 mV and 270 mV at current density of 10 mA cm
–2
in 1 M KOH. In particular, NiCo
2
Se
4
exhibits a low overpotential as well as a smaller Tafel slope of 63 mV dec
−1
, leading to robust stability in alkaline conditions. The abundant active sites, large mass and size of NiCo
2
Se
4
enhances the performance of the OER. This type of selenide-based material with low toxicity is also an advantage for eco-friendly applications.
Title: One-dimensional hierarchical nanostructures of NiCo
2
O
4
, NiCo
2
S
4
and NiCo
Description:
Abstract
Oxygen evolution reaction (OER), a sluggish multistep process in electrochemical water splitting, is still a challenging issue to achieve with cheap, earth-abundant non-precious and non-polluting materials.
In this work, three different electrocatalysts, specifically NiCo
2
O
4
, NiCo
2
S
4
, and NiCo
2
Se
4,
synthesized by simple hydrothermal process, show excellent OER activity.
This report not only projects OER performances but also demonstrates a modified method for the transformation of NiCo
2
O
4
to NiCo
2
S
4
and NiCo
2
Se
4
via sulfidation and selenization reactions.
The well crystalline, porous nature of NiCo
2
O
4
, NiCo
2
S
4
, and NiCo
2
Se
4
electrocatalysts with one dimensional (1D) structural morphology affords overpotentials of 346 mV, 309 mV and 270 mV at current density of 10 mA cm
–2
in 1 M KOH.
In particular, NiCo
2
Se
4
exhibits a low overpotential as well as a smaller Tafel slope of 63 mV dec
−1
, leading to robust stability in alkaline conditions.
The abundant active sites, large mass and size of NiCo
2
Se
4
enhances the performance of the OER.
This type of selenide-based material with low toxicity is also an advantage for eco-friendly applications.
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