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Vertically-interlaced NiFeP/MXene electrocatalyst with tunable electronic structure for high-efficiency oxygen

Jiexin Chen1, Qingwu Long2, Kang Xiao3

  • 1School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials, Guangzhou University, Guangzhou 510006, China.

Science Bulletin
|January 19, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces NiFeP/MXene, a novel hybrid catalyst for enhanced oxygen evolution reaction (OER) and water splitting. The material demonstrates superior performance, offering a promising pathway for efficient energy conversion technologies.

Keywords:
Electronic structureNiFe phosphideOxygen evolution reactionPhosphatingTitanium carbide (MXene)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Layered double hydroxides (LDHs) show promise for oxygen evolution reaction (OER) but suffer from poor conductivity and stability.
  • Improving NiFe-LDHs via heteroatom introduction or conductive substrates is crucial for water-splitting applications.

Purpose of the Study:

  • To synthesize and characterize novel vertically interlaced ternary phosphatised nickel/iron hybrids on titanium carbide flakes (NiFeP/MXene).
  • To evaluate the electrocatalytic performance of NiFeP/MXene for the oxygen evolution reaction (OER) and water splitting.

Main Methods:

  • Hydrothermal reaction and phosphating calcination process for NiFeP/MXene synthesis.
  • Electrochemical testing in alkaline electrolyte to determine OER activity and water-splitting performance.
  • Density functional theory (DFT) calculations to elucidate the mechanism of performance enhancement.

Main Results:

  • Optimized NiFeP/MXene achieved a low OER overpotential of 286 mV at 10 mA cm⁻² and a Tafel slope of 35 mV dec⁻¹.
  • NiFeP/MXene demonstrated excellent water-splitting anode performance with a cell voltage of 1.61 V at 10 mA cm⁻².
  • DFT calculations confirmed that MXene substrate and phosphating tune electronic structure for enhanced OER.

Conclusions:

  • NiFeP/MXene represents a high-performance catalyst for OER and water splitting, surpassing existing NiFe-based catalysts.
  • The synergistic effect of MXene conductivity and phosphating treatment is key to improving catalyst performance.
  • This work provides a valuable strategy for designing advanced MXene-supported electrocatalysts for energy applications.