Affiliation:
1. Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beijing 100029 China
2. Yunnan Precious Metals Lab Kunming 650100 China
Abstract
AbstractEntropy‐based polymetallic oxides with configurational entropy, structure flexibility, and crystallographic orientation have been regarded as promising catalysts for oxygen evolution reaction (OER), due to their electronic energy band occupation, composition ligand stabilization, and “cocktail” effect. Herein, a rutile RuIrAgMnO2 oxide with an orientation along the (110) facets is first fabricated by a low‐temperature directional co‐pyrolysis strategy of metal salts on Ti foil at 300 °C. The quaternary oxide exhibits a texture coefficient of 1.13 along (110) facet, resulting from concerted shaping of Ag and Mn components presenting a vibrational entropy of 1.13 R (R is the gas content). In 0.5 m H2SO4, it displays an overpotential of 171 mV at 10 mA cm−2 for OER, running at a voltage for 340 h at 100 mA cm−2. The remarkably improved performance can be associated with the presence of the preferred (110) facets with in‐plane strains, which activate and stabilize OER process via electronic energy band reconstruction. More interestingly, the preferential orientation prevents the diffusion or dissolution of active metal ions caused by entropy‐dependent energy barriers, ensuring long‐term stability. This work can pave the way for entropy‐driven polymetallic oxides with optimal structures, disrupting the trade‐off between activity and stability in water oxidation.
Funder
National Natural Science Foundation of China