1
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Ogada J, Ehirim TJ, Ipadeola AK, Haruna AB, Mwonga PV, Abdullah AM, Yang XY, Eid K, Wamwangi DM, Ozoemena KI. Interfacial Electronic Interactions within the Pd-CeO 2/Carbon Onions Define the Efficient Electrocatalytic Ethanol Oxidation Reaction in Alkaline Electrolytes. ACS Omega 2024; 9:7439-7451. [PMID: 38405481 PMCID: PMC10882676 DOI: 10.1021/acsomega.3c04427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/24/2023] [Accepted: 09/27/2023] [Indexed: 02/27/2024]
Abstract
Porous Pd-based electrocatalysts are promising materials for alkaline direct ethanol fuel cells (ADEFCs) and ethanol sensors in the development of renewable energy and point-of-contact ethanol sensor test kits for drunk drivers. However, experimental and theoretical investigations of the interfacial interaction among Pd nanocrystals on supports (i.e., carbon black (CB), onion-like carbon (OLC), and CeO2/OLC) toward ADEFC and ethanol sensors are not yet reported. This is based on the preparation of Pd-CeO2/OLC nanocrystals by the sol-gel and impregnation methods. Evidently, the porous Pd-CeO2/OLC significantly increased membrane-free micro-3D-printed ADEFC performance with a high peak power density (Pmax = 27.15 mW cm-2) that is 1.38- and 7.58-times those of Pd/OLC (19.72 mW cm-2) and Pd/CB (3.59 mW cm-2), besides its excellent stability for 48 h. This is due to the excellent interfacial interaction among Pd, CeO2, and OLC, evidenced by density functional theory (DFT) simulations that showed a modulated Pd d-band center and facile active oxygenated species formation by the CeO2 needed for ethanol fuel cells. Similarly, Pd-CeO2/OLC gives excellent sensitivity (0.00024 mA mM-1) and limit of detection (LoD = 8.7 mM) for ethanol sensing and satisfactory recoveries (89-108%) in commercial alcoholic beverages (i.e., human serum, Amstel beer, and Nederberg Wine). This study shows the excellent possibility of utilizing Pd-CeO2/OLC for future applications in fuel cells and alcohol sensors.
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Affiliation(s)
- Jimodo
J. Ogada
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- School
of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Tobechukwu J. Ehirim
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Adewale K. Ipadeola
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- Gas
Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
- Center
for Advanced Materials, Qatar University, Doha 2713, Qatar
| | - Aderemi B. Haruna
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Patrick V. Mwonga
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | | | - Xiao-Yu Yang
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Kamel Eid
- Gas
Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Daniel M. Wamwangi
- School
of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Kenneth I. Ozoemena
- School
of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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2
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Ipadeola AK, Abdelgawad A, Salah B, Abdullah AM, Eid K. Interfacial Engineering of Porous Pd/M (M = Au, Cu, Mn) Sponge-like Nanocrystals with a Clean Surface for Enhanced Alkaline Electrochemical Oxidation of Ethanol. Langmuir 2023; 39:13830-13840. [PMID: 37724885 DOI: 10.1021/acs.langmuir.3c01285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
The interfacial engineering of Pd-based alloys (i.e., PdM with distinct morphologies, compositions, and strain defects) is an efficient way for enhanced catalytic activity; however, it remains a grand challenge to fabricate such alloys in aqueous solutions without heating, organic solvents, and multiple reaction steps. Herein, we present a simple, aqueous-phase, one-step, and ultrafast approach for the interfacial engineering of surfactant-free porous PdM (M = Cu, Au, and Mn) nanocrystals with well-controlled spongy-like morphology and compositions. The electronic interaction in PdM nanocrystals and their effect on the alkaline electrochemical ethanol oxidation reaction (EOR) are investigated using XRD, XPS, and electrochemical tests. Notably, integrating M metals into Pd atoms results in upshifting the d-band center of Pd and subsequently modulating the EOR activity and stability substantially. The EOR mass activity (10.78 A/mgPd (6.93 A/mgPdCu)) of PdCu was 1.83, 3.09, 4.51, and 53.90 times higher than those of AuPd (5.90 A/mgPd (3.27 A/mgAuPd)), PdMn (3.48 A/mgPd (3.19 A/mgPdMn)), Pd (2.39 A/mgPd), and Pd/C (0.20 A/mgPd), respectively, besides substantial durability after 1000 cycles. This is due to the porous two-dimensional morphology, a low synergetic effect, higher interfacial interaction, and greater active surface area of PdCu, besides a high Cu content with more oxophilicity that facilitates activation/dissociation of H2O to generate -OH species needed for quick EOR electrocatalysis. The electrochemical impedance spectroscopy (EIS) reveals better electrolyte/electrode interfacial interaction and lower charge transfer resistance on PdCu. The EOR activity of PdCu porous sponge-like nanocrystals was superior to all previously reported Pd-based alloys for electrochemical EOR. This study indicates that binary Pd-based catalysts with less synergetic effect are preferred for boosting the EOR activity, which could help in manipulating the surface properties of Pd-based alloys to optimize EOR performance.
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Affiliation(s)
- Adewale K Ipadeola
- Center for Advanced Materials, Qatar University, Doha 2713, Qatar
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Ahmed Abdelgawad
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Belal Salah
- Center for Advanced Materials, Qatar University, Doha 2713, Qatar
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | | | - Kamel Eid
- Gas Processing Center(GPC), College of Engineering, Qatar University, Doha 2713, Qatar
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3
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Salah B, Ipadeola AK, Abdullah AM, Ghanem A, Eid K. Self-Standing Pd-Based Nanostructures for Electrocatalytic CO Oxidation: Do Nanocatalyst Shape and Electrolyte pH Matter? Int J Mol Sci 2023; 24:11832. [PMID: 37511591 PMCID: PMC10380336 DOI: 10.3390/ijms241411832] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 07/11/2023] [Accepted: 07/18/2023] [Indexed: 07/30/2023] Open
Abstract
Tailoring the shape of Pd nanocrystals is one of the main ways to enhance catalytic activity; however, the effect of shapes and electrolyte pH on carbon monoxide oxidation (COOxid) is not highlighted enough. This article presents the controlled fabrication of Pd nanocrystals in different morphologies, including Pd nanosponge via the ice-cooling reduction of the Pd precursor using NaBH4 solution and Pd nanocube via ascorbic acid reduction at 25 °C. Both Pd nanosponge and Pd nanocube are self-standing and have a high surface area, uniform distribution, and clean surface. The electrocatalytic CO oxidation activity and durability of the Pd nanocube were significantly superior to those of Pd nanosponge and commercial Pd/C in only acidic (H2SO4) medium and the best among the three media, due to the multiple adsorption active sites, uniform distribution, and high surface area of the nanocube structure. However, Pd nanosponge had enhanced COOxid activity and stability in both alkaline (KOH) and neutral (NaHCO3) electrolytes than Pd nanocube and Pd/C, attributable to its low Pd-Pd interatomic distance and cleaner surface. The self-standing Pd nanosponge and Pd nanocube were more active than Pd/C in all electrolytes. Mainly, the COOxid current density of Pd nanocube in H2SO4 (5.92 mA/cm2) was nearly 3.6 times that in KOH (1.63 mA/cm2) and 10.3 times that in NaHCO3 (0.578 mA/cm2), owing to the greater charge mobility and better electrolyte-electrode interaction, as evidenced by electrochemical impedance spectroscopy (EIS) analysis. Notably, this study confirmed that acidic electrolytes and Pd nanocube are highly preferred for promoting COOxid and may open new avenues for precluding CO poisoning in alcohol-based fuel cells.
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Affiliation(s)
- Belal Salah
- Center for Advanced Materials, Qatar University, Doha 2713, Qatar
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | - Adewale K Ipadeola
- Center for Advanced Materials, Qatar University, Doha 2713, Qatar
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | | | - Alaa Ghanem
- PVT-Lab, Production Department, Egyptian Petroleum Research Institute, Cairo 11727, Egypt
| | - Kamel Eid
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
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Ipadeola AK, Salah B, Ghanem A, Ahmadaliev D, Sharaf MA, Abdullah AM, Eid K. Unveiling the effect of shapes and electrolytes on the electrocatalytic ethanol oxidation activity of self-standing Pd nanostructures. Heliyon 2023; 9:e16890. [PMID: 37484255 PMCID: PMC10360946 DOI: 10.1016/j.heliyon.2023.e16890] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 05/26/2023] [Accepted: 05/31/2023] [Indexed: 07/25/2023] Open
Abstract
Morphologically controlled Pd-based nanocrystals are the most efficient strategies for improving the electrocatalytic ethanol oxidation reaction (EOR) performance; however, their morphological-EOR activity relationship and effect of electrolytes at a wide pH range are still ambiguous. Here, we have synthesized porous self-standing Pd clustered nanospheres (Pd-CNSs) and Pd nanocubes (Pd-NCBs) for the EOR in acidic (H2SO4), alkaline (KOH), and neutral (NaHCO3) electrolytes compared to commercial spherical-like Pd/C catalysts. The fabrication process comprises the ice-cooling reduction of Pd precursor by sodium borohydride (NaBH4) and l-ascorbic acid to form Pd-CNSs and Pd-NCBs, respectively. The EOR activity of Pd-CNSs significantly outperformed those of Pd-NCBs, and Pd/C in all electrolytes, but the EOR activity was better in KOH than in H2SO4 and NaHCO3. This is due to the 3D porous clustered nanospherical morphology that makes Pd active centers more accessible and maximizes their utilization during EOR. The EOR specific/mass activities of Pd-CNSs reached (8.51 mA/cm2/2.39 A/mgPd) in KOH, (2.98 mA/cm2/0.88 A/mgPd) in H2SO4, and (0.061 mA/cm2/0.0083 A/mgPd) in NaHCO3, in addition to stability after 1000 cycles. This study affirms that porous 3D spherical Pd nanostructures are preferred for the EOR than those of 0D spherical-like and multi-dimensional cube-like nanostructures.
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Affiliation(s)
- Adewale K. Ipadeola
- Center for Advanced Materials, Qatar University, Doha, 2713, Qatar
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha, 2713, Qatar
| | - Belal Salah
- Center for Advanced Materials, Qatar University, Doha, 2713, Qatar
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha, 2713, Qatar
| | - Alaa Ghanem
- PVT-Lab, Production Department, Egyptian Petroleum Research Institute, Nasr City, 11727, Cairo, Egypt
| | - Doniyorbek Ahmadaliev
- Department of Chemical & Material Science Engineering of School of Engineering, New Uzbekistan University, Tashkent, 100007, Uzbekistan
| | - Mohammed A. Sharaf
- Department of Maritime Transportation Management Engineering, Istanbul University-Cerrahpasa, 34320, Avcilar/Istanbul, Turkey
- Mericler Inc. Educational Consulting, Esentepe, Yazarlar Sk. No 21, 34381, Sisli/Istanbul, Turkey
| | | | - Kamel Eid
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha, 2713, Qatar
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5
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Ipadeola AK, Eid K, Abdullah AM, Al-Hajri RS, Ozoemena KI. Correction: Pd/Ni-metal-organic framework-derived porous carbon nanosheets for efficient CO oxidation over a wide pH range. Nanoscale Adv 2022; 5:300. [PMID: 36605815 PMCID: PMC9765424 DOI: 10.1039/d2na90092k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 11/07/2022] [Indexed: 06/17/2023]
Abstract
[This corrects the article DOI: 10.1039/D2NA00455K.].
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Affiliation(s)
| | - Kamel Eid
- Gas Processing Center (GPC), College of Engineering, Qatar University Doha 2713 Qatar
| | | | - Rashid S Al-Hajri
- Petroleum and Chemical Engineering Department, Sultan Qaboos University Muscat Oman
| | - Kenneth I Ozoemena
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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6
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Ipadeola AK, Eid K, Abdullah AM, Al-Hajri RS, Ozoemena KI. Pd/Ni-metal-organic framework-derived porous carbon nanosheets for efficient CO oxidation over a wide pH range. Nanoscale Adv 2022; 4:5044-5055. [PMID: 36504739 PMCID: PMC9680948 DOI: 10.1039/d2na00455k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 09/04/2022] [Indexed: 05/26/2023]
Abstract
Metal nanocrystal ornamented metal-organic frameworks (MOFs) are of particular interest in multidisciplinary applications; however, their electrocatalytic CO oxidation performance over wide pH ranges is not yet reported. Herein, Ni-MOF-derived hierarchical porous carbon nanosheets (Ni-MOF/PC) with abundant Ni-N x sites decorated with Pd nanocrystals (Pd/Ni-MOF/PC) were synthesized by microwave-irradiation (MW-I) followed by annealing at 900 °C and subsequent etching of Ni-MOF/C prior to Pd deposition. The fabrication mechanism comprises the generation of self-reduced reducing gases from triethylamine during the annealing and selective chemical etching of Ni, thereby facilitating the reduction of Ni-anchored MOF and Pd nanocrystal deposition with the aid of ethylene glycol and MW-I to yield Pd/Ni-N x enriched MOF/PC. The synthetic strategies endear the Pd/Ni-MOF/PC with unique physicochemical merits: abundant defects, interconnected pores, high electrical conductivity, high surface area, Ni-deficient but more active sites for Pd/Ni-N x in porous carbon nanosheets, and synergism. These merits endowed the CO oxidation activity and stability on Pd/Ni-MOF/PC substantially than those of Pd/Ni-MOF/C and Pd/C catalysts in wide pH conditions (i.e., KOH, HClO4, and NaHCO3). The CO oxidation activity study reveals the utilization of MOF/PC with metal nanocrystals (Pd/Ni) in CO oxidation catalysis.
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Affiliation(s)
| | - Kamel Eid
- Gas Processing Center (GPC), College of Engineering, Qatar University Doha 2713 Qatar
| | | | - Rashid S Al-Hajri
- Petroleum and Chemical Engineering Department, Sultan Qaboos University Muscat Oman
| | - Kenneth I Ozoemena
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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7
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Ipadeola AK, Eid K, Abdullah AM, Ozoemena KI. Pd-Nanoparticles Embedded Metal-Organic Framework-Derived Hierarchical Porous Carbon Nanosheets as Efficient Electrocatalysts for Carbon Monoxide Oxidation in Different Electrolytes. Langmuir 2022; 38:11109-11120. [PMID: 36040806 DOI: 10.1021/acs.langmuir.2c01841] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Rational synthesis of Co-ZIF-67 metal-organic framework (MOF)-derived carbon-supported metal nanoparticles is essential for various energy and environmental applications; however, their catalytic activity toward carbon monoxide (CO) oxidation in various electrolytes is not yet emphasized. Co-ZIF-67-derived hierarchical porous carbon nanosheet-supported Pd nanocrystals (Pd/ZIF-67/C) were prepared using a simple microwave-irradiation approach followed by carbonization and etching. Mechanistically, during microwave irradiation, triethyleneamine provides abundant reducing gases that promote the formation of Pd nanoparticles/Co-Nx in porous carbon nanosheets with the assistance of ethylene glycol and also form a multimodal pore size. The electrocatalytic CO oxidation activity and stability of Pd/ZIF-67/C outperformed those of commercial Pd/C and Pt/C catalysts by (4.2 and 4.4, 4.0 and 2.7, 3.59 and 2.7) times in 0.1 M HClO4, 0.1 M KOH, and 0.1 M NaHCO3, respectively, due to the catalytic properties of Pd besides the conductivity of Co-Nx active sites and delicate porous structures of ZIF-67. Notably, using Pd/ZIF-67/C results in a higher CO oxidation activity than Pd/C and Pt/C. This study may pave the way for using MOF-supported multi-metallic nanoparticles for CO oxidation electrocatalysis.
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Affiliation(s)
| | - Kamel Eid
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar
| | | | - Kenneth I Ozoemena
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South Africa
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8
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Ogada JJ, Ipadeola AK, Mwonga PV, Haruna AB, Nichols F, Chen S, Miller HA, Pagliaro MV, Vizza F, Varcoe JR, Meira DM, Wamwangi DM, Ozoemena KI. Correction to “CeO 2 Modulates the Electronic States of Palladium Onion-like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion Exchange Membrane Fuel Cells”. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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K Lebechi A, Ipadeola AK, Eid K, Abdullah AM, Ozoemena KI. Porous spinel-type transition metal oxide nanostructures as emergent electrocatalysts for oxygen reduction reactions. Nanoscale 2022; 14:10717-10737. [PMID: 35861592 DOI: 10.1039/d2nr02330j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Porous spinel-type transition metal oxide (PS-TMO) nanocatalysts comprising two kinds of metal (denoted as AxB3-xO4, where A, B = Co, Ni, Zn, Mn, Fe, V, Sm, Li, and Zn) have emerged as promising electrocatalysts for oxygen reduction reactions (ORRs) in energy conversion and storage systems (ECSS). This is due to the unique catalytic merits of PS-TMOs (such as p-type conductivity, optical transparency, semiconductivity, multiple valence states of their oxides, and rich active sites) and porous morphologies with great surface area, low density, abundant transportation paths for intermediate species, maximized atom utilization and quick charge mobility. In addition, PS-TMOs nanocatalysts are easily prepared in high yield from Earth-abundant and inexpensive metal precursors that meet sustainability requirements and practical applications. Owing to the continued developments in the rational synthesis of PS-TMOs nanocatalysts for ORRs, it is utterly imperative to provide timely updates and highlight new advances in this research area. This review emphasizes recent research advances in engineering the morphologies and compositions of PS-TMOs nanocatalysts in addition to their mechanisms, to decipher their structure-activity relationships. Also, the ORR mechanisms and fundamentals are discussed, along with the current barriers and future outlook for developing the next generation of PS-TMOs nanocatalysts for large-scale ECSS.
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Affiliation(s)
- Augustus K Lebechi
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South Africa.
| | | | - Kamel Eid
- Gas Processing Center (GPC), College of Engineering, Qatar University, Doha 2713, Qatar.
| | | | - Kenneth I Ozoemena
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO Wits, Johannesburg 2050, South Africa.
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Ipadeola AK, Eid K, Lebechi AK, Abdullah AM, Ozoemena KI. Porous multi-metallic Pt-based nanostructures as efficient electrocatalysts for ethanol oxidation: A mini-review. Electrochem commun 2022. [DOI: 10.1016/j.elecom.2022.107330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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11
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Ogada JJ, Ipadeola AK, Mwonga PV, Haruna AB, Nichols F, Chen S, Miller HA, Pagliaro MV, Vizza F, Varcoe JR, Meira DM, Wamwangi DM, Ozoemena KI. CeO 2 Modulates the Electronic States of a Palladium Onion-Like Carbon Interface into a Highly Active and Durable Electrocatalyst for Hydrogen Oxidation in Anion-Exchange-Membrane Fuel Cells. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01863] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jimodo J. Ogada
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Adewale K. Ipadeola
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Patrick V. Mwonga
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Aderemi B. Haruna
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Forrest Nichols
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Hamish A. Miller
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Maria V. Pagliaro
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Francesco Vizza
- Institute of Chemistry of Organometallic Compounds − National Research Council of Italy (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - John R. Varcoe
- Department of Chemistry, University of Surrey, Guildford, Surrey GU2 7XH, U.K
| | - Debora Motta Meira
- CLS@APS Sector 20, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, United States
- Canadian Light Source Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Daniel M. Wamwangi
- School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Kenneth I. Ozoemena
- School of Chemistry, Molecular Sciences Institute, University of the Witwatersrand, Johannesburg 2050, South Africa
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12
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Ipadeola AK, Lebechi AK, Gaolatlhe L, Haruna AB, Chitt M, Eid K, Abdullah AM, Ozoemena KI. Porous High-Entropy Alloys as Efficient Electrocatalysts for Water-Splitting Reactions. Electrochem commun 2022. [DOI: 10.1016/j.elecom.2022.107207] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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13
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Ipadeola AK, Haruna AB, Gaolatlhe L, Lebechi AK, Meng J, Pang Q, Eid K, Abdullah AM, Ozoemena KI. Front Cover: Efforts at Enhancing Bifunctional Electrocatalysis and Related Events for Rechargeable Zinc‐Air Batteries (ChemElectroChem 21/2021). ChemElectroChem 2021. [DOI: 10.1002/celc.202101285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Aderemi B. Haruna
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Lesego Gaolatlhe
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Augustus K. Lebechi
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Jiashen Meng
- School of Materials Science and Engineering Peking University Beijing 100871 China
| | - Quanquan Pang
- School of Materials Science and Engineering Peking University Beijing 100871 China
| | - Kamel Eid
- Gas Processing Centre, College of Engineering Qatar University Doha 2713 Qatar
| | - Aboubakr M. Abdullah
- Centre for Advanced Materials, College of Engineering Qatar University Doha 2713 Qatar
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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14
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Ipadeola AK, Haruna AB, Gaolatlhe L, Lebechi AK, Meng J, Pang Q, Eid K, Abdullah AM, Ozoemena KI. Efforts at Enhancing Bifunctional Electrocatalysis and Related Events for Rechargeable Zinc‐Air Batteries. ChemElectroChem 2021. [DOI: 10.1002/celc.202101284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Aderemi B. Haruna
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Lesego Gaolatlhe
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Augustus K. Lebechi
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Jiashen Meng
- School of Materials Science and Engineering Peking University Beijing 100871 China
| | - Quanquan Pang
- School of Materials Science and Engineering Peking University Beijing 100871 China
| | - Kamel Eid
- Gas Processing Centre, College of Engineering Qatar University Doha 2713 Qatar
| | - Aboubakr M. Abdullah
- Centre for Advanced Materials, College of Engineering Qatar University Doha 2713 Qatar
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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15
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Ipadeola AK, Mwonga PV, Ozoemena KI. Hydrogen oxidation and oxygen reduction reactions on palladium nano-electrocatalyst supported on nickel-deficient MOF-derived carbons. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138860] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Ipadeola AK, Haruna AB, Gaolatlhe L, Lebechi AK, Meng J, Pang Q, Eid K, Abdullah AM, Ozoemena KI. Efforts at Enhancing Bifunctional Electrocatalysis and Related Events for Rechargeable Zinc‐Air Batteries. ChemElectroChem 2021. [DOI: 10.1002/celc.202100574] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Aderemi B. Haruna
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Lesego Gaolatlhe
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Augustus K. Lebechi
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Jiashen Meng
- School of Materials Science and Engineering Peking University Beijing 100871 China
| | - Quanquan Pang
- School of Materials Science and Engineering Peking University Beijing 100871 China
| | - Kamel Eid
- Gas Processing Centre, College of Engineering Qatar University Doha 2713 Qatar
| | - Aboubakr M. Abdullah
- Centre for Advanced Materials, College of Engineering Qatar University Doha 2713 Qatar
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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17
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Madrid E, Harabajiu C, Hill RS, Black K, Torrente‐Murciano L, Dickinson AJ, Fletcher PJ, Ozoemena KI, Ipadeola AK, Oguzie E, Akalezi CO, Marken F. Indirect Formic Acid Fuel Cell Based on a Palladium or Palladium‐Alloy Film Separating the Fuel Reaction and Electricity Generation. ChemElectroChem 2021. [DOI: 10.1002/celc.202001570] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Elena Madrid
- Department of Chemistry University of Bath Claverton Down BA2 7AY Bath UK
| | - Catajina Harabajiu
- Department of Chemistry University of Bath Claverton Down BA2 7AY Bath UK
| | - Robyn S. Hill
- Department of Chemistry University of Bath Claverton Down BA2 7AY Bath UK
| | - Kate Black
- School of Engineering University of Liverpool Liverpool L69 3BX UK
| | - Laura Torrente‐Murciano
- Department of Chemical Engineering and Biotechnology University of Cambridge Philippa Fawcett Drive Cambridge CB3 0AS UK
| | | | - Philip J. Fletcher
- Materials and Chemical Characterisation Facility (MC2) University of Bath Claverton Down BA2 7AY Bath UK
| | - Kenneth I. Ozoemena
- School of Chemistry Molecular Sciences Institute University of the Witwatersrand Private Bag 3 Wits PO ZA-2050 Johannesburg South Africa
| | - Adewale K. Ipadeola
- School of Chemistry Molecular Sciences Institute University of the Witwatersrand Private Bag 3 Wits PO ZA-2050 Johannesburg South Africa
| | - Emeka Oguzie
- Department of Chemistry Electrochemistry & Materials Science Research Laboratory Federal University of Technology Owerri Owerri Nigeria
| | - Chris O. Akalezi
- Department of Chemistry Electrochemistry & Materials Science Research Laboratory Federal University of Technology Owerri Owerri Nigeria
| | - Frank Marken
- Department of Chemistry University of Bath Claverton Down BA2 7AY Bath UK
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18
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Ipadeola AK, Mwonga PV, Ray SC, Maphanga RR, Ozoemena KI. Cover Picture: Bifunctional Behavior of Pd/Ni Nanocatalysts on MOF‐Derived Carbons for Alkaline Water‐splitting (Electroanalysis 12/2020). ELECTROANAL 2020. [DOI: 10.1002/elan.202081201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Patrick V. Mwonga
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Sekar C. Ray
- Department of Physics University of South Africa, Florida Campus Johannesburg 1709 South Africa
| | - Rapela R. Maphanga
- Next Generation Enterprises and Institutions Council for Scientific and Industrial Research (CSIR) P.O. Box 395 Pretoria 0001 South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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19
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Ipadeola AK, Mwonga PV, Ray SC, Maphanga RR, Ozoemena KI. Cover Feature: Palladium/Stannic Oxide Interfacial Chemistry Promotes Hydrogen Oxidation Reactions in Alkaline Medium (ChemElectroChem 22/2020). ChemElectroChem 2020. [DOI: 10.1002/celc.202001285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Patrick V. Mwonga
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Sekar C. Ray
- Department of Physics University of South Africa, Florida Campus Johannesburg 1709 South Africa
| | - Rapela R. Maphanga
- Next Generation Enterprises and Institutions Council for Scientific and Industrial Research (CSIR) P.O. Box 395 Pretoria 0001 South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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Mwonga PV, Ipadeola AK, Naidoo SR, Quandt A, Ozoemena KI. Annealing Boosts the Supercapacitive Properties of Molybdenum Disulfide Powder. ELECTROANAL 2020. [DOI: 10.1002/elan.202060436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Patrick V. Mwonga
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa
- School of Physics University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa
| | - Adewale K. Ipadeola
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa
| | - Shunmugam R. Naidoo
- School of Physics University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa
| | - Alexander Quandt
- School of Physics University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3 Wits 2050 Johannesburg South Africa
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21
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Ipadeola AK, Mwonga PV, Ray SC, Maphanga RR, Ozoemena KI. Bifunctional Behavior of Pd/Ni Nanocatalysts on MOF‐Derived Carbons for Alkaline Water‐splitting. ELECTROANAL 2020. [DOI: 10.1002/elan.202060427] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Patrick V. Mwonga
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Sekar C. Ray
- Department of Physics University of South Africa, Florida Campus Johannesburg 1709 South Africa
| | - Rapela R. Maphanga
- Next Generation Enterprises and Institutions Council for Scientific and Industrial Research (CSIR) P.O. Box 395 Pretoria 0001 South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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Ipadeola AK, Mwonga PV, Ray SC, Maphanga RR, Ozoemena KI. Palladium/Stannic Oxide Interfacial Chemistry Promotes Hydrogen Oxidation Reactions in Alkaline Medium. ChemElectroChem 2020. [DOI: 10.1002/celc.202000952] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Adewale K. Ipadeola
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Patrick V. Mwonga
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
| | - Sekar C. Ray
- Department of Physics University of South Africa, Florida Campus Johannesburg 1709 South Africa
| | - Rapela R. Maphanga
- Next Generation Enterprises and Institutions Council for Scientific and Industrial Research (CSIR) P.O. Box 395 Pretoria 0001 South Africa
| | - Kenneth I. Ozoemena
- Molecular Sciences Institute, School of Chemistry University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa
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23
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Ipadeola AK, Ozoemena KI. Alkaline water-splitting reactions over Pd/Co-MOF-derived carbon obtained via microwave-assisted synthesis. RSC Adv 2020; 10:17359-17368. [PMID: 35521459 PMCID: PMC9053437 DOI: 10.1039/d0ra02307h] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 04/24/2020] [Indexed: 11/21/2022] Open
Abstract
Cobalt-based metal-organic framework-derived carbon (MOFDC) has been studied as a new carbon-based support for a Pd catalyst for electrochemical water-splitting; i.e., the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium. The study shows a high increase in the HER activity, in terms of low onset overpotential (onset η = 35 mV vs. RHE), high exchange current density (j o,s ≈ 0.22 mA cm-2), high mass activity (j o,m ≈ 59 mA mg-1), high kinetic current (j K ≈ 5-8 mA cm-2) and heterogeneous rate constant (k 0 ≈ 4 × 10-4 cm s-1), which are attributed to the high porosity of MOFDC and contribution from residual Co, while the large Tafel slope (b c = 261 mV dec-1) is ascribed to the high degree of hydrogen adsorption onto polycrystalline Pd as a supplementary reaction step to the suggested Volmer-Heyrovsky mechanism. These values for the catalyst are comparable to or better than many recent reports that adopted nano-carbon materials and/or use bi- or ternary Pd-based electrocatalysts for the HER. The improved HER activity of Pd/MOFDC is associated with the positive impact of MOFDC and residual Co on the Pd catalyst (i.e., low activation energy, E A ≈ 12 kJ mol-1) which allows for easy desorption of the Hads to generate hydrogen. Moreover, Pd/MOFDC displays better OER activity than its analogue, with lower onset η (1.29 V vs. RHE) and b a (≈78 mV dec-1), and higher current response (ca. 18 mA cm-2). Indeed, this study provides a new strategy of designing and synthesizing MOFDC with physico-chemical features for Pd-based electrocatalysts that will allow for efficient electrochemical water-splitting processes.
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Affiliation(s)
- Adewale K Ipadeola
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa +27 11 717 6730
| | - Kenneth I Ozoemena
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, PO Wits Johannesburg 2050 South Africa +27 11 717 6730
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Ipadeola AK, Barik R, Ray SC, Ozoemena KI. Bimetallic Pd/SnO2 Nanoparticles on Metal Organic Framework (MOF)-Derived Carbon as Electrocatalysts for Ethanol Oxidation. Electrocatalysis (N Y) 2019. [DOI: 10.1007/s12678-019-00518-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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