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Badreldin A, Youssef K, El Ghenymy A, Wubulikasimu Y, Ghouri ZK, Elsaid K, Kumar D, Abdel-Wahab A. Solution Combustion Synthesis of Novel S,B-Codoped CoFe Oxyhydroxides for the Oxygen Evolution Reaction in Saline Water. ACS Omega 2022; 7:5521-5536. [PMID: 35187367 PMCID: PMC8851632 DOI: 10.1021/acsomega.1c06968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 01/21/2022] [Indexed: 05/13/2023]
Abstract
Green hydrogen presents itself as a clean energy vector, which can be produced by electrolysis of water by utilizing renewable energy such as solar or wind. While current technologies are sufficient to support commercial deployment of fresh water electrolyzers, there remain a few well-defined challenges in the path of commercializing direct seawater electrolyzers, predominantly related to the sluggish oxygen evolution reaction (OER) kinetics and the competing chlorine evolution reaction (CER) at the anode. Herein, we report the facile and swift fabrication of an S,B-codoped CoFe oxyhydroxide via solution combustion synthesis for the OER with apparent CER suppression abilities. The as-prepared S,B-(CoFe)OOH-H attained ultralow overpotentials of 161 and 278 mV for achieving current densities of 10 and 1000 mA cm-2, respectively, in an alkaline saline (1 M KOH + 0.5 M NaCl) electrolyte, with a low Tafel slope of 46.7 mV dec-1. Chronoamperometry testing of the codoped bimetallic oxyhydroxides showed very stable behavior in harsh alkaline saline and in neutral pH saline environments. S,B-(CoFe)OOH-H oxyhydroxide showed a notable decrease in CER production in comparison to the other S,B-codoped counterparts. Selectivity measurements through online FE calculations showed high OER selectivity in alkaline (FE ∼ 97%) and neutral (FE ∼ 91%) pH saline conditions under standard 10 mA cm-2 operation. Moreover, systematic testing in electrolytes at pH values of 14 to 7 yielded promising results, thus bringing direct seawater electrolysis at near-neutral pH conditions closer to realization.
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Affiliation(s)
- Ahmed Badreldin
- Chemical
Engineering Program, Texas A&M University
at Qatar, P.O. 23874 Doha, Qatar
| | - Karim Youssef
- Chemical
Engineering Program, Texas A&M University
at Qatar, P.O. 23874 Doha, Qatar
- Qatar
Shell Service Company W.L.L., P.O. Box 3747 Doha, Qatar
| | | | - Yiming Wubulikasimu
- Chemical
Engineering Program, Texas A&M University
at Qatar, P.O. 23874 Doha, Qatar
| | - Zafar Khan Ghouri
- Chemical
Engineering Program, Texas A&M University
at Qatar, P.O. 23874 Doha, Qatar
- International
Center for Chemical and Biological Sciences, HEJ Research Institute
of Chemistry, University of Karachi, 75270 Karachi, Pakistan
| | - Khaled Elsaid
- Chemical
Engineering Program, Texas A&M University
at Qatar, P.O. 23874 Doha, Qatar
| | - Dharmesh Kumar
- Qatar
Shell Service Company W.L.L., P.O. Box 3747 Doha, Qatar
| | - Ahmed Abdel-Wahab
- Chemical
Engineering Program, Texas A&M University
at Qatar, P.O. 23874 Doha, Qatar
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Badreldin A, Nabeeh A, Ghouri ZK, Abed J, Wang N, Wubulikasimu Y, Youssef K, Kumar D, Stodolny MK, Elsaid K, Sargent EH, Abdel-Wahab A. Early Transition-Metal-Based Binary Oxide/Nitride for Efficient Electrocatalytic Hydrogen Evolution from Saline Water in Different pH Environments. ACS Appl Mater Interfaces 2021; 13:53702-53716. [PMID: 34730350 DOI: 10.1021/acsami.1c13002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Using abundant seawater can reduce reliance on freshwater resources for hydrogen production from electrocatalytic water splitting. However, seawater has detrimental effects on the stability and activity of the hydrogen evolution reaction (HER) electrocatalysts under different pH conditions. In this work, we report the synthesis of binary metallic core-sheath nitride@oxynitride electrocatalysts [Ni(ETM)]δ+-[O-N]δ-, where ETM is an early transition metal V or Cr. Using NiVN on a nickel foam (NF) substrate, we demonstrate an HER overpotential as low as 32 mV at -10 mA cm-2 in saline water (0.6 M NaCl). The results represent an advancement in saline water HER performance of earth-abundant electrocatalysts, especially under near-neutral pH range (i.e., pH 6-8). Doping ETMs in nickel oxynitrides accelerates the typically rate-determining H2O dissociation step for HER and suppresses chloride deactivation of the catalyst in neutral-pH saline water. Heterointerface synergism occurs through H2O adsorption and dissociation at interfacial oxide character, while adsorbed H* proceeds via Heyrovsky or Tafel step on the nitride character. This electrocatalyst showed stable performance under a constant current density of -50 mA cm-2 for 50 h followed by additional 50 h at -100 mA cm-2 in a neutral saline electrolyte (1 M PB + 0.6 M NaCl). Contrarily, under the same conditions, Pt/C@NF exhibited significantly low performance after a mere 4 h at -50 mA cm-2. The low Tafel slope of 25 mV dec-1 indicated that the reaction is Tafel limited, unlike commercial Pt/C, which is Heyrovsky limited. We close by discussing general principles concerning surface charge delocalization for the design of HER electrocatalysts in pH saline environments.
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Affiliation(s)
- Ahmed Badreldin
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874 Doha, Qatar
| | - Ahmed Nabeeh
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874 Doha, Qatar
| | - Zafar Khan Ghouri
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874 Doha, Qatar
| | - Jehad Abed
- Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 3G4 Ontario, Canada
| | - Ning Wang
- Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 3G4 Ontario, Canada
| | - Yiming Wubulikasimu
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874 Doha, Qatar
| | - Karim Youssef
- Qatar Shell Research and Technology Centre, P.O. Box 3747 Doha, Qatar
| | - Dharmesh Kumar
- Qatar Shell Research and Technology Centre, P.O. Box 3747 Doha, Qatar
| | - Maciej K Stodolny
- Shell Global Solutions International B.V., 1031 HW Amsterdam, Netherlands
| | - Khaled Elsaid
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874 Doha, Qatar
| | - Edward H Sargent
- Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 3G4 Ontario, Canada
| | - Ahmed Abdel-Wahab
- Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874 Doha, Qatar
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Rezvani SJ, Favre L, Giuli G, Wubulikasimu Y, Berbezier I, Marcelli A, Boarino L, Pinto N. Spontaneous shape transition of Mn x Ge 1- x islands to long nanowires. Beilstein J Nanotechnol 2021; 12:366-374. [PMID: 33981531 PMCID: PMC8093550 DOI: 10.3762/bjnano.12.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 04/01/2021] [Indexed: 06/12/2023]
Abstract
We report experimental evidence for a spontaneous shape transition, from regular islands to elongated nanowires, upon high-temperature annealing of a thin Mn wetting layer evaporated on Ge(111). We demonstrate that 4.5 monolayers is the critical thickness of the Mn layer, governing the shape transition to wires. A small change around this value modulates the geometry of the nanostructures. The Mn-Ge alloy nanowires are single-crystalline structures with homogeneous composition and uniform width along their length. The shape evolution towards nanowires occurs for islands with a mean size of ≃170 nm. The wires, up to ≃1.1 μm long, asymptotically tend to ≃80 nm of width. We found that tuning the annealing process allows one to extend the wire length up to ≃1.5 μm with a minor rise of the lateral size to ≃100 nm. The elongation process of the nanostructures is in agreement with a strain-driven shape transition mechanism proposed in the literature for other heteroepitaxial systems. Our study gives experimental evidence for the spontaneous formation of spatially uniform and compositionally homogeneous Mn-rich GeMn nanowires on Ge(111). The reliable and simple synthesis approach allows one to exploit the room-temperature ferromagnetic properties of the Mn-Ge alloy to design and fabricate novel nanodevices.
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Affiliation(s)
- S Javad Rezvani
- INFN - Laboratori Nazionali di Frascati, Via Enrico Fermi 54, Frascati, Italy
- Advanced Materials Metrology and Life Science Division, INRiM (Istituto Nazionale di Ricerca Metrologica), Strada delle Cacce 91, Torino, Italy
| | - Luc Favre
- IM2NP, CNRS, Aix-Marseille Université, Marseille (AMU), France
| | - Gabriele Giuli
- School of Science and Technology, Geology division, University of Camerino, Camerino, Italy
| | - Yiming Wubulikasimu
- School of Science and Technology, Geology division, University of Camerino, Camerino, Italy
| | | | - Augusto Marcelli
- INFN - Laboratori Nazionali di Frascati, Via Enrico Fermi 54, Frascati, Italy
- CNR - Istituto Struttura della Materia and Elettra-Sincrotrone Trieste, Basovizza Area Science Park, 34149 Trieste, Italy
- RICMASS - Rome International Center for Materials Science – Superstripes, Via dei Sabelli 119A, 00185 Roma, Italy
| | - Luca Boarino
- Advanced Materials Metrology and Life Science Division, INRiM (Istituto Nazionale di Ricerca Metrologica), Strada delle Cacce 91, Torino, Italy
| | - Nicola Pinto
- Advanced Materials Metrology and Life Science Division, INRiM (Istituto Nazionale di Ricerca Metrologica), Strada delle Cacce 91, Torino, Italy
- School of Science and Technology, Physics division, University of Camerino, Camerino, Italy
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