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Catalysis

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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Related Experiment Video

Updated: Mar 16, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

A nickel iron diselenide-derived efficient oxygen-evolution catalyst.

Xiang Xu¹, Fang Song¹, Xile Hu¹

¹Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-ISIC-LSCI, BCH 3305, Lausanne CH 1015, Switzerland.

Nature Communications

|August 10, 2016

Summary

This summary is machine-generated.

Metal selenides transform into active metal oxides during oxygen evolution reactions. This discovery led to a new nickel iron oxide catalyst derived from nickel iron diselenide, showing high efficiency for solar fuel generation.

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Last Updated: Mar 16, 2026

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Published on: February 19, 2018

Area of Science:

Electrochemistry
Materials Science
Catalysis

Background:

Efficient oxygen-evolution reaction (OER) catalysts are crucial for cost-effective solar fuel production.
Metal selenides show promise as OER catalysts, but their active species remain unclear.
Understanding active species is key to designing superior OER catalysts.

Purpose of the Study:

To elucidate the active species of metal selenide catalysts during OER.
To leverage this understanding for the development of novel, high-performance OER catalysts.

Main Methods:

Investigated nickel selenide as a model catalyst under OER conditions.
Characterized the transformation of nickel selenide during catalysis.
Synthesized a novel nickel iron diselenide and used it as a precursor for nickel iron oxide catalyst.

Main Results:

Nickel selenide completely converts to nickel hydroxide under OER conditions.
In situ generated metal oxides, not the selenides, are the active OER species.
The novel nickel iron oxide catalyst derived from nickel iron diselenide exhibits a low overpotential of 195 mV at 10 mA cm(-2).

Conclusions:

Metal selenides are unstable precursors, with their derived oxides being the active OER species.
Identifying active catalytic species is critical for catalyst design.
This work presents a new templating strategy for highly active oxide catalysts for solar fuel generation.