NiCoP-CeO₂ composites for efficient electrochemical oxygen evolution.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Developing efficient electrocatalysts is crucial for energy conversion technologies.
• Oxygen Evolution Reaction (OER) is a key bottleneck in many electrochemical processes, such as water splitting.
• Novel composite materials offer potential for improved catalytic activity and stability.

Purpose of the Study:

• To synthesize and characterize a novel NiCoP-CeO2 composite material.
• To investigate the electrocatalytic performance of the NiCoP-CeO2 composite for OER.
• To elucidate the mechanism behind the enhanced OER performance.

Main Methods:

• Hydrothermal method and thermal phosphating strategy for material synthesis.
• Electrochemical testing, including OER performance and Tafel slope analysis.
• Theoretical calculations and experimental characterization (e.g., morphology, surface properties).

Main Results:

• The NiCoP-CeO2 composite exhibited excellent OER activity with a low overpotential of 217 mV at 10 mA cm-2 and a Tafel slope of 45 mV dec-1.
• CeO2 demonstrated a confinement effect, preserving the nanosheet morphology of NiCo-LDHs and enhancing catalyst-water contact.
• Loading CeO2 onto NiCoP significantly improved the catalyst's hydrophilicity.

Conclusions:

• The NiCoP-CeO2 composite is a highly efficient and inexpensive electrocatalyst for OER.
• The enhanced performance is attributed to the synergistic effects of CeO2, including morphological stability and improved hydrophilicity.
• The study presents an innovative synthesis strategy for advanced electrocatalytic materials.