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Ultrafine Ruthenium Oxide Nanoparticles Supported on Molybdenum Oxide Nanosheets as Highly Efficient Electrocatalyst for Hydrogen Evolution in Acidic Medium
Author(s) -
Sadhanala Hari Krishna,
Harika Villa Krishna,
Penki Tirupathi Rao,
Aurbach Doron,
Gedanken Aharon
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201801990
Subject(s) - overpotential , tafel equation , electrocatalyst , catalysis , ruthenium oxide , calcination , exchange current density , ruthenium , molybdenum , oxide , nanoparticle , inorganic chemistry , materials science , electrochemistry , water splitting , chemical engineering , hydrogen production , chemistry , nanotechnology , electrode , photocatalysis , metallurgy , organic chemistry , engineering
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 (MoO 3 @RuO 2 ). This composite catalyst was prepared sonochemically, followed by calcination of the product in air at 400 °C for one hour. The as‐synthesized MoO 3 @RuO 2 composite catalyst was used to explore the electro‐catalytic hydrogen evolution reaction in acidic medium. Notably, compared to MoO 3 or RuO 2 , 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 H 2 SO 4 . The Tafel slope of the MoO 3 @RuO 2 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 MoO 3 nanosheets and RuO 2 nanoparticles, which resulted in enhanced long‐term stability as well.