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A High Faraday Efficiency NiMoO4 Nanosheet Array Catalyst by Adjusting the Hydrophilicity for Overall Water Splitting
Zining Wang1, Hui Wang1, Shan Ji2
1State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of, Science and Technology, Qingdao, 266042, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 30, 2020
Summary
Highly active and stable electrodes for water splitting were developed using iron-doped carbon quantum dots on nickel-molybdenum oxide nanosheets. This binder-free catalyst significantly enhances hydrogen and oxygen evolution reactions for efficient water electrolysis.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient and stable electrocatalysts is crucial for water splitting.
- Binder-free electrodes simplify fabrication and improve performance.
- Transition-metal compounds offer promising catalytic properties.
Purpose of the Study:
- To synthesize a highly active, stable, and binder-free electrode for water splitting.
- To enhance the performance of nickel-molybdenum oxide nanosheet arrays using iron-doped carbon quantum dots.
- To investigate the structural and electrochemical properties of the modified electrode.
Main Methods:
- Synthesis of 3D NiMoO4 nanosheet arrays on nickel foam.
- Modification with 0D Fe-doped carbon quantum dots (Fe-CQDs).
- Characterization using electron microscopy and contact angle analysis.
- Electrochemical testing for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
Main Results:
- Fe-CQDs were uniformly dispersed on NiMoO4 nanosheets, enhancing surface hydrophilicity.
- The Fe-CQDs/NiMoO4/NF catalyst exhibited significantly improved activity and durability for water splitting.
- Achieved low overpotentials of 117 mV for HER and 336 mV for OER at 10 mA cm-2.
- Demonstrated a Faraday efficiency of up to 99% for the water splitting process.
Conclusions:
- The 3D nanosheet array structure, synergistic effects, and optimal hydrophilicity contribute to enhanced catalytic performance.
- Fe-CQDs/NiMoO4/NF is a promising binder-free electrocatalyst for efficient electrochemical water splitting.
- The developed catalyst offers a viable solution for advanced energy applications requiring water electrolysis.
