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Roughened Zn‐Doped Ru–Ti Oxide Water Oxidation Electrocatalysts by Blending Active and Activated Passive Components
Author(s) -
Kishor Koshal,
Saha Sulay,
Gupta Manish Kumar,
Bajpai Anshumaan,
Chatterjee Moitrayee,
Sivakumar Sri,
Pala Raj Ganesh S.
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500137
Subject(s) - overpotential , dopant , materials science , oxygen evolution , dissolution , chemical engineering , oxide , electrochemistry , metal , electrode , doping , inorganic chemistry , metallurgy , chemistry , optoelectronics , engineering
An approach to decreasing the overpotential, increasing the stability, and optimizing the noble‐metal composition of electrocatalysts for the oxygen evolution reaction (OER) in acidic media is demonstrated. Essential components of this approach are: 1) combining an active (unstable Ru) component with a dopant (Zn)‐activated passive (stable Ti) element, 2) blending these elements by co‐electrodeposition in an acidic environment in which dissolution of the unstable component (excess Ru) promotes roughness, and 3) further increasing the roughness of the resultant electrode through chemical inhomogeneity by the incorporation of Ti and through structural inhomogeneity by incorporation of Zn in RuO 2 . The composition of the electrode with the maximal activity is Ru 0.258 Ti 0.736 Zn 0.006 O x , and its activity is four times higher than that of RuO 2 . The electrochemical stability towards the OER follows the order RuTiZn>RuTi>RuZn>Ru. This design strategy provides a facile method to improve activity without compromising stability.