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Interface Engineering of Co(OH)2/Ag/FeP Hierarchical Superstructure as Efficient and Robust Electrocatalyst for
ACS Applied Materials & Interfaces
|February 7, 2019
Summary
A novel Co(OH)2/Ag/FeP hybrid electrocatalyst efficiently splits water in alkaline media. This bifunctional catalyst demonstrates excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activity and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Efficient electrocatalysts are crucial for water splitting.
- Developing bifunctional catalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media is challenging.
Purpose of the Study:
- To rationally design and prepare a Co(OH)2/Ag/FeP hybrid electrocatalyst.
- To investigate its performance for overall water splitting in alkaline media.
Main Methods:
- Multiscale structure surface engineering of Co(OH)2/Ag/FeP hybrid.
- Electrochemical characterizations to evaluate HER and OER activity and stability.
- First-principle calculations to understand the catalytic mechanism.
Main Results:
- The Co(OH)2/Ag/FeP hybrid achieved low overpotentials for HER (118 mV) and OER (236 mV) at 10 mA cm-2.
- The catalyst exhibited enhanced electron structure beneficial for catalysis.
- An electrolyzer using this catalyst required only 1.56 V for 10 mA cm-2, outperforming commercial catalysts.
Conclusions:
- The engineered Co(OH)2/Ag/FeP hybrid is a highly efficient bifunctional electrocatalyst for alkaline water splitting.
- The interfacial engineering and optimized components are key to its superior performance.
- This material shows great promise for practical water electrolysis applications.
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