Ru/Rh Cation Doping and Oxygen ‐Vacancy Engineering of FeOOH Nanoarrays@Ti3C2Tx MXene Heterojunction for Highly Efficient and Stable Electrocatalytic Oxygen Evolution

A cation-doping and oxygen-vacancy engineering is developed to fabricate Ru/Rh-doped FeOOH nanoarrays with abundant oxygen-vacancies in situ grown on Ti3C2Tx MXene (Ru/Rh-FeOOH@Ti3C2Tx), which presents superior OER activity and stability in alkaline media. Experimental and theoretical results verify Ru/Rh-cation doping and oxygen vacancy can decrease adsorption/desorption energy barrier and activation energy, optimizing intrinsic OER activity of Ru/Rh-FeOOH@Ti3C2Tx. AbstractOxyhydroxides hold promise as highly-efficient non-noble electrocatalysts for the oxygen evolution reaction (OER), but their poor conductivity and structural instability greatly impede their progress. Herein, the authors develop a cation-doping and oxygenvacancy engineering strategy to fabricate Ru/Rh-doped FeOOH nanoarrays with abundant oxygen-vacancies in situ grown on Ti3C2Tx MXene (Ru/Rh-FeOOH@Ti3C2Tx) as highly-efficient OER electrocatalysts. Benefiting from Ru/Rh-cation regulation, oxygenvacancy engineering, and heterojunction synergy between MXene and modulated FeOOH, the optimized Rh/Ru-FeOOH@Ti3C2Tx electrocatalysts exhibit excellent OER activities and remarkable stabilities with 100 h. Particularly, 3%Rh-FeOOH@Ti3C2Tx electrocatalyst only needs a 223 mV overpotential at 10 mA cm–2 and 306 mV to reach 100 mA cm–2, which is superior to commercial IrO2 catalyst and most reported oxyhydroxide-based electrocatalysts. Further, systematically theoretical caculation, kinetics, thermodynamics, and mic...
Source: Small - Category: Nanotechnology Authors: Tags: Research Article Source Type: research
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