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When NiO@Ni Meets WS2 Nanosheet Array: A Highly Efficient and Ultrastable Electrocatalyst for Overall Water Splitting
Dewen Wang1,2, Qun Li1,2, Ce Han1
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.
ACS Central Science
|February 3, 2018
Summary
A novel NiO@Ni decorated WS2 nanosheet composite on carbon cloth acts as a bifunctional electrocatalyst. This material shows high efficiency for hydrogen and oxygen evolution reactions, crucial for water splitting applications.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Developing efficient and stable bifunctional electrocatalysts is critical for large-scale water splitting.
- Existing catalysts often face challenges with cost, efficiency, or stability.
Purpose of the Study:
- To design and synthesize a novel NiO@Ni decorated WS2 nanosheet array on carbon cloth (NiO@Ni/WS2/CC) composite.
- To evaluate its performance as a bifunctional electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
Main Methods:
- Synthesis of a three-dimensional (3D) synergistic electrocatalyst (NiO@Ni/WS2/CC).
- Electrochemical characterization of HER and OER activities in alkaline media.
- Testing the performance in an alkaline electrolyzer.
Main Results:
- The NiO@Ni/WS2/CC composite demonstrated significantly improved HER and OER activities compared to individual components.
- Achieved Pt-like activity for HER and superior OER performance over commercial RuO2.
- Exhibited excellent long-term durability and enabled an alkaline electrolyzer at a record low cell voltage of 1.42 V for 10 mA cm-2.
Conclusions:
- The 3D configuration and synergistic effects of NiO, Ni, and WS2 contribute to the enhanced catalytic performance.
- This work presents a new strategy for designing advanced bifunctional catalysts for efficient water splitting.
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