TY - JOUR
T1 - Ultrafine Ruthenium Oxide Nanoparticles Supported on Molybdenum Oxide Nanosheets as Highly Efficient Electrocatalyst for Hydrogen Evolution in Acidic Medium
AU - Sadhanala, Hari Krishna
AU - Harika, Villa Krishna
AU - Penki, Tirupathi Rao
AU - Aurbach, Doron
AU - Gedanken, Aharon
N1 - Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/3/6
Y1 - 2019/3/6
N2 - 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.
AB - 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.
KW - Composite catalyst
KW - Hydrogen evolution reaction
KW - Molybdenum disulfide
KW - Ruthenium oxide
KW - Sonochemistry
UR - http://www.scopus.com/inward/record.url?scp=85061225945&partnerID=8YFLogxK
U2 - 10.1002/cctc.201801990
DO - 10.1002/cctc.201801990
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SN - 1867-3880
VL - 11
SP - 1495
EP - 1502
JO - ChemCatChem
JF - ChemCatChem
IS - 5
ER -
