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Related Concept Videos

Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Interface Engineering via Ti3C2T MXene Enabled Highly Efficient Bifunctional NiCoP Array Catalysts for Alkaline Water

Minsik Jeong1, Sanghyeon Park2, Taehyun Kwon1

  • 1Department of Urban, Energy, and Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 28644, Republic of Korea.

ACS Applied Materials & Interfaces
|June 26, 2024
PubMed
Summary

A new non-noble metal electrocatalyst, NiCoP nanoneedle array on MXene-coated Ni foam (NCP-MX/NF), shows excellent efficiency and stability for overall water splitting, a key for renewable energy. This catalyst outperforms traditional noble metal catalysts.

Keywords:
Ti3C2Tx MXenealkaline water splittingbifunctional electrocatalystinterface engineeringnickel cobalt phosphide (NiCoP)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Developing efficient and stable non-noble metal electrocatalysts is crucial for advancing renewable energy systems, particularly for overall water splitting.
  • Existing catalysts often face challenges related to cost, efficiency, and long-term stability, necessitating innovative material design.

Purpose of the Study:

  • To fabricate a novel heterostructured electrocatalyst using non-noble metals for highly efficient and stable overall water splitting.
  • To investigate the synergistic effects between nickel-cobalt phosphide nanoneedles and MXene for enhanced electrocatalytic activity.

Main Methods:

  • Fabrication of a NiCoP nanoneedle array on a Ti3C2Tx MXene-coated Ni foam substrate (NCP-MX/NF) via dip-coating and hydrothermal methods, followed by phosphorization.
  • Electrocatalytic performance evaluation for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media.
  • Assessment of overall water splitting performance and long-term stability.
  • Density Functional Theory (DFT) calculations to elucidate the interfacial catalytic mechanisms.

Main Results:

  • The NCP-MX/NF catalyst exhibited superior electrocatalytic performance with low overpotentials (72 mV for HER, 303 mV for OER at high current densities) and low Tafel slopes (49.2 mV dec⁻¹ for HER, 69.5 mV dec⁻¹ for OER).
  • The catalyst demonstrated excellent long-term stability for both HER and OER.
  • Overall water splitting performance required low potentials (1.54 V at 10 mA cm⁻² and 1.76 V at 50 mA cm⁻²), surpassing the Pt/C∥IrO2 benchmark.
  • DFT calculations confirmed the catalytic contribution of the NCP/Ti3C2O2 interface and analyzed adsorption energetics of intermediates.

Conclusions:

  • The heterostructured NCP-MX/NF catalyst offers a promising non-noble metal alternative for efficient and durable overall water splitting.
  • Synergistic effects between NCP and MXene significantly enhance electrocatalytic activity and stability.
  • The developed fabrication method and catalyst design provide a viable pathway for next-generation electrocatalysts in renewable energy applications.