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A step towards efficient water splitting: a high-performance CuCo(OH)₂/CNT/MoS₂ electrocatalyst.

Sahana Raju¹, Darshan M¹, Bhanupriya H¹

¹Department of Chemistry, School of Applied Sciences, REVA University, Bangalore-560064, India. shivanna87@gmail.com.

|March 6, 2025

Summary

A novel CuCo(OH)₂/CNT/MoS₂ electrocatalyst shows excellent performance for oxygen evolution (OER) and hydrogen evolution (HER) reactions. This bifunctional material offers high efficiency and durability for overall water splitting in various conditions.

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Developing efficient electrocatalysts is crucial for sustainable energy technologies like water splitting.
Existing catalysts often suffer from low activity, poor stability, or high cost.
Bifunctional electrocatalysts that can catalyze both oxygen evolution and hydrogen evolution reactions are highly desirable.

Purpose of the Study:

To synthesize and characterize a novel CuCo(OH)₂/CNT/MoS₂ composite electrocatalyst.
To evaluate the electrocatalytic performance of the composite for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).
To investigate the durability and efficiency of the composite for overall water splitting (OWS).

Main Methods:

Rapid co-precipitation synthesis of the CuCo(OH)₂/CNT/MoS₂ composite.
Electrochemical characterization including overpotential, Tafel slope, and cyclic voltammetry.
Durability testing in alkaline and acidic media.
Calculation of turnover frequency (TOF) and mass activity.

Main Results:

The CuCo(OH)₂/CNT/MoS₂ composite exhibited low overpotentials for OER (65 mV) and HER (211 mV) at η₁₀.
Exceptional durability was observed, with activity maintained for over 40 hours (alkaline) and 25 hours (acidic).
Overall water splitting required only 170 mV overpotential, significantly decreasing after stability tests.

Conclusions:

The synergistic effect between CuCo(OH)₂, CNT, and MoS₂ enhances electrical conductivity and surface area, boosting electrochemical performance.
The synthesized composite is a highly efficient and durable bifunctional electrocatalyst for overall water splitting.
This material holds significant promise for advancing hydrogen production technologies.