Ultrafine Ruthenium Oxide Nanoparticles Supported on Molybdenum Oxide Nanosheets as Highly Efficient Electrocatalyst for Hydrogen Evolution in Acidic Medium. Issue 5 (8th February 2019)

• Record Type: Journal Article
• Authors: Sadhanala, Hari Krishna; Harika, Villa Krishna; Penki, Tirupathi Rao; Aurbach, Doron; Gedanken, Aharon
• Is Part Of: ChemCatChem. Volume 11:Issue 5(2019)
• Page Start: 1495
• Page End: 1502
• Publication Date: 2019-02-08
• Subjects: Molybdenum disulfide -- Ruthenium oxide -- Composite catalyst -- Sonochemistry -- Hydrogen evolution reaction; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201801990
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Engineering of efficient, robust and inexpensive Pt‐free catalysts for the hydrogen evolution reaction has drawn great attention, and there is a rapidly growing demand for electrochemical water‐splitting reactions. Here, we report, for the first time, synthesis of ruthenium oxide nanoparticles supported on molybdenum oxide nanosheets (MoO3 @RuO2 ). This composite catalyst was prepared sonochemically, followed by calcination of the product in air at 400 °C for one hour. The as‐synthesized MoO3 @RuO2 composite catalyst was used to explore the electro‐catalytic hydrogen evolution reaction in acidic medium. Notably, compared to MoO3 or RuO2, the composite exhibited high exchange current density of 0.57 mA cm −2, and a current density of 10 mA cm −2 was achieved at low overpotential of 110 mV in 0.5 M H2 SO4 . The Tafel slope of the MoO3 @RuO2 catalyst was 62 mV dec −1 and it showed excellent stability. This remarkable performance can be attributed to the synergetic effect generated by the strong interaction between MoO3 nanosheets and RuO2 nanoparticles, which resulted in enhanced long‐term stability as well. Abstract : Sono and Chemical : We report the synthesis of RuO2 nanoparticles supported on MoO3 nanosheets (MoO3 @RuO2 ) with a green sonochemical method followed by calcination. The as‐prepared MoO3 @RuO2 composite was demonstrated as a highly active electrocatalyst for the hydrogen evolution reaction in acidic solution.