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Wu YH, Mehta H, Willinger E, Yuwono JA, Kumar PV, Abdala PM, Wach A, Kierzkowska A, Donat F, Kuznetsov DA, Müller CR. Altering Oxygen Binding by Redox-Inactive Metal Substitution to Control Catalytic Activity: Oxygen Reduction on Manganese Oxide Nanoparticles as a Model System. Angew Chem Int Ed Engl 2023; 62:e202217186. [PMID: 36538473 PMCID: PMC10108258 DOI: 10.1002/anie.202217186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/20/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
Establishing generic catalyst design principles by identifying structural features of materials that influence their performance will advance the rational engineering of new catalytic materials. In this study, by investigating metal-substituted manganese oxide (spinel) nanoparticles, Mn3 O4 :M (M=Sr, Ca, Mg, Zn, Cu), we rationalize the dependence of the activity of Mn3 O4 :M for the electrocatalytic oxygen reduction reaction (ORR) on the enthalpy of formation of the binary MO oxide, Δf H°(MO), and the Lewis acidity of the M2+ substituent. Incorporation of elements M with low Δf H°(MO) enhances the oxygen binding strength in Mn3 O4 :M, which affects its activity in ORR due to the established correlation between ORR activity and the binding energy of *O/*OH/*OOH species. Our work provides a perspective on the design of new compositions for oxygen electrocatalysis relying on the rational substitution/doping by redox-inactive elements.
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Affiliation(s)
- Yi-Hsuan Wu
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Harshit Mehta
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Elena Willinger
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Jodie A Yuwono
- School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.,College of Engineering and Computer Science, Australian National University, Canberra, ACT 2601, Australia
| | - Priyank V Kumar
- School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Paula M Abdala
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Anna Wach
- Paul Scherrer Institute, 5232, Villigen, Switzerland
| | - Agnieszka Kierzkowska
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Felix Donat
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Denis A Kuznetsov
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
| | - Christoph R Müller
- Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland
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Gu W, Li X, Xing M, Fang W, Wu D. Removal of phosphate from water by amine-functionalized copper ferrite chelated with La(III). THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 619-620:42-48. [PMID: 29136533 DOI: 10.1016/j.scitotenv.2017.11.098] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 11/07/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
Eutrophication has become a worldwide environmental problem and removing phosphorus from water/wastewater before discharge is essential. The purpose of our present study was to develop an efficient material in terms of both phosphate adsorption capacity and magnetic separability. To this end, we first compared the performances of four spinel ferrites, including magnesium, zinc, nickel and copper ferrites. Then we developed a copper ferrite-based novel magnetic adsorbent, by synthesizing 1,6-hexamethylenediamine-functionalized copper ferrite(CuFe2O4) via a single solvothermal synthesis process followed by LaCl3 treatment. The materials were characterized with X-ray diffraction, transmission electron microscope, vibrating sample magnetometer, Fourier transform infrared spectra and N2 adsorption-desorption. The maximum adsorption capacity of our material, calculated from the Langmuir adsorption isotherm model, attained 32.59mg/g with a saturation magnetization of 31.32emu/g. Data of adsorption kinetics were fitted well to the psuedo-second-order model. Effects of solution pH and coexisting anions (Cl-, NO3-, SO42-) on phosphate adsorption were also investigated, showing that our material had good selectivity for phosphate. But OH- competed efficiently with phosphate for adsorption sites. Furthermore, increasing both NaOH concentration and temperature resulted in an enhancement of desorption efficiency. Thus NaOH solution could be used to desorb phosphate adsorbed on the material for reuse, by adopting a high NaOH concentration and/or a high temperature.
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Affiliation(s)
- Wei Gu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Rd., Shanghai 200240, China
| | - Xiaodi Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Rd., Shanghai 200240, China
| | - Mingchao Xing
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Rd., Shanghai 200240, China
| | - Wenkan Fang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Rd., Shanghai 200240, China
| | - Deyi Wu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Rd., Shanghai 200240, China.
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