Ru/Rh Cation Doping and Oxygen‐Vacancy Engineering of FeOOH Nanoarrays@Ti3C2Tx MXene Heterojunction for Highly Efficient and Stable Electrocatalytic Oxygen Evolution. Issue 25 (13th May 2022)

• Record Type: Journal Article
• Authors: Zhang, Bing; Shan, Jiongwei; Wang, Xinying; Hu, Yanjie; Li, Yunyong
• Is Part Of: Small. Volume 18:Issue 25(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-13
• Subjects: cation doping -- oxygen evolution reaction -- oxygen vacancy -- oxyhydroxides -- Ti 3C 2T x MXene; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202200173
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Oxyhydroxides 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 Ti3 C2 Tx MXene (Ru/Rh‐FeOOH@Ti3 C2 Tx ) 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@Ti3 C2 Tx electrocatalysts exhibit excellent OER activities and remarkable stabilities with 100 h. Particularly, 3%Rh‐FeOOH@Ti3 C2 Tx 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 microstructural analysis verify that the integration of Ru/Rh‐cation doping and oxygen vacancy obviously enhances the intrinsic conductivity and lattice defects of FeOOH and expose more active sites, thereby decreasing the adsorption/desorption energy barrier and activation energy, and improving the specific activity and catalytic kinetics of electrocatalysts, whereas in situ hybridization with MXene strengthens the structural stability. This work clearly confirms that cationdoping and oxygen‐vacancy engineering offers a joint strategy for the electronic structure modulation and design of highly‐efficient inexpensive OER electrocatalysts. Abstract : A cation‐doping and oxygen‐vacancy engineering is developed to fabricate Ru/Rh‐doped FeOOH nanoarrays with abundant oxygen‐vacancies in situ grown on Ti3 C2 Tx MXene (Ru/Rh‐FeOOH@Ti3 C2 Tx ), 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@Ti3 C2 Tx .