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Benzoate Anion-Intercalated Layered Cobalt Hydroxide Nanoarray: An Efficient Electrocatalyst for the Oxygen Evolution

Ruixiang Ge^1,2, Xiang Ren¹, Xuqiang Ji¹

¹College of Chemistry, Sichuan University, Chengdu, 610064, Sichuan, P. R. China.

|August 26, 2017

Summary

Researchers developed a novel benzoate-intercalated cobalt hydroxide nanobelt array catalyst for efficient oxygen evolution reaction (OER) in water splitting. This advanced catalyst demonstrates superior performance and stability, paving the way for improved energy technologies.

Keywords:

benzoate cobalt hydroxide nanoarray oxygen evolution reaction water splitting

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Efficient oxygen evolution reaction (OER) catalysts are crucial for advancing electrochemical water splitting technologies.
Current catalysts often face limitations in activity and stability, hindering widespread application.

Purpose of the Study:

To develop a novel OER catalyst with enhanced activity and stability.
To investigate the effect of anion intercalation on the catalytic performance of layered cobalt hydroxide nanobelt arrays.

Main Methods:

A one-pot hydrothermal synthesis was employed to create benzoate anion-intercalated layered cobalt hydroxide nanobelt arrays on nickel foam (benzoate-Co(OH)₂ /NF).
Electrochemical performance was evaluated using techniques such as cyclic voltammetry and chronoamperometry.
Structural characterization included X-ray diffraction to determine interlayer spacing.

Main Results:

The benzoate-Co(OH)₂ /NF electrode exhibited an expanded interlayer spacing of 14.72 Å, significantly enhancing OER catalytic activity.
Achieved a high current density of 50 mA cm^-2 at an overpotential of 291 mV, outperforming the carbonate-intercalated counterpart (337 mV at 50 mA cm^-2).
Demonstrated excellent catalytic stability, maintaining activity for 21 hours.

Conclusions:

The benzoate anion intercalation effectively expands the interlayer spacing of cobalt hydroxide nanobelts, leading to superior OER performance.
The developed benzoate-Co(OH)₂ /NF presents a promising candidate for efficient and durable electrocatalysts in water splitting applications.