High-Index Faceted Cufes2 Nanosheets with Enhanced Behavior for Boosting Hydrogen Evolution Reaction

Document Type

Article

Language

eng

Publication Date

6-6-2017

Publisher

Royal Society of Chemistry

Source Publication

Nanoscale

Source ISSN

2040-3364

Abstract

A rational design of highly active and robust catalysts based on earth-abundant elements for hydrogen evolution reaction (HER) is essential for future renewable energy applications. Herein, we report the synthesis of a new class of ultrathin metallic CuFeS2 nanosheets (NSs) with abundant exposed high-index {04} facets. They serve as a robust catalyst for the HER with a lower onset potential of 28.1 mV, an overpotential of only 88.7 mV (at j = 10 mA cm−2) and remarkable long-term stability in 0.5 M H2SO4, which make them the best system among all the reported non-noble metal catalysts. The theoretical calculations reveal that the mechanistic origin for such a high HER activity should be attributed to the excess S2− active sites on the exposed {04} high-index facets of CuFeS2 NSs, which have a rather favorable Gibbs free energy for atomic hydrogen adsorption. The present work highlights the importance of designing ultrathin metallic chalcopyrite nanosheets with high-index facets in order to increase the number of active sites for boosting the HER performance.

Comments

Nanoscale, Vol. 9 (2017): 9230-9237. DOI.

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