Electrocatalytic performance of Pd-based electro-catalysts supported on CNTs for isopropanol and ethanol electro-oxidation in alkaline medium

Zikhali, Memory; Matthews, Thabo; Selepe, Cyril T.; Adegoke, Kayode Adesina; Mugadza, K.; Gwebu, Sandile Surprise; Maxakato, Nobanathi Wendy

doi:10.1016/j.mtchem.2023.101484

Cited by 3 publications

(4 citation statements)

References 101 publications

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“…This sets 2-propanol apart from nearly all other direct liquid fuels that have achieved reasonable power generation in a fuel cell. 40 The process thus shows that OH − adsorption promotes the iPrOR. Moreover, stepwise electron transfer pathways (Scheme 2) and a transformation are described in detail by the following equations: To support the above-proposed mechanism, we also calculated the presence of the active sites in Ni/NiO-NS@ CN by measuring the area under the curve due to Ni-OOH formation representing a single electron transfer process as demonstrated in Figure S6.…”

Section: Possible Mechanistic Pathway For Iprormentioning

confidence: 94%

“…It is a combination of two facts: (a) the finding that oxidation of 2-propanol in the fuel cell can be achieved with almost no CO 2 formation and (b) the fact that the so-formed hydrogen-lean form, acetone, can be hydrogenated easily both by classical catalytic and by electrochemical means. This sets 2-propanol apart from nearly all other direct liquid fuels that have achieved reasonable power generation in a fuel cell …”

Section: Possible Mechanistic Pathway For Iprormentioning

confidence: 99%

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New Insight into N,S-Doped Carbon Nanosheets Embedded with Ni/NiO Nanocluster Electrocatalysts Derived from Conjugated Polymers for the Oxidation of 2-Propanol to Acetone

Tanwade,

Adhikari,

Sathe

2024

J. Phys. Chem. C

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Propanol electrooxidation represents a vital reaction, as it offers a pathway for directly transforming renewable resources into valuable chemical products and green hydrogen. This study presents an approach for the synthesis and characterization of Ni/ NiO-NS@CN nanosheets using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), chronoamperometry (i−t), field emission scanning electron microscopy (FE-SEM), highresolution transmission microscopy (HR-TEM), UV−vis spectroscopy, Fourier transform infrared (FTIR), X-ray photoelectron (XP) and Raman spectroscopy, X-ray diffraction (XRD), energy-dispersive analysis of X-ray (EDAX), BET (Braunner−Emmet−Teller) surface area measurements, and thermogravimetric analysis (TGA) were employed to provide in-depth characterization of the nanocomposite. The analysis revealed a unique nanosheet template decorated with Ni/NiO, C, N, O, and S elemental composition, exhibiting an irregular distribution with a face-centered cubic (FCC) crystal structure and interlayer d-spacing of ∼0.23 nm. Moreover, the defect-induced carbon backbone featured Ni in the +2 oxidation state. Remarkably, the Ni/NiO-NS@CN nanocomposite demonstrated exceptional electrocatalytic activity and stability for 15,000 s at 0.45 V vs SCE (saturated calomel electrode) in the electrooxidation of isopropanol (iPrOH). It exhibited a significantly lower onset potential (0.32 V vs SCE) and superior performance as compared to oxygen evolution reaction (OER), as well as electrooxidation reactions of ethanol and methanol. Furthermore, this study employed 13 C NMR spectroscopy to identify acetone as the primary product of the iPrOH oxidation reaction (iPrOR). Impressively, after 10 h of reaction time, high selectivity and 73% Faradaic efficiency were achieved. This research underscores the critical role of catalyst structure and applied potential in influencing the electrooxidation of iPrOH providing valuable insights under various conditions and opening promising avenues for future green energy and chemical synthesis developments.

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Section: Possible Mechanistic Pathway For Iprormentioning

confidence: 94%

Section: Possible Mechanistic Pathway For Iprormentioning

confidence: 99%

New Insight into N,S-Doped Carbon Nanosheets Embedded with Ni/NiO Nanocluster Electrocatalysts Derived from Conjugated Polymers for the Oxidation of 2-Propanol to Acetone

Tanwade,

Adhikari,

Sathe

2024

J. Phys. Chem. C

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“…It has been revealed that CNTs incorporating Pd nanoparticles exhibit enhanced catalytic activity for hydrogen adsorption and dissociation . Recent research by Zikhali et al has demonstrated that Pd-CNTs great potential for catalyzing the electro-oxidation of isopropanol and ethanol in alkaline environments . Furthermore, the adsorption/desorption performance of H 2 in Mg/MgH 2 can be improved by incorporating nanocatalyst on carbon nanotube-confined materials in situ.…”

Section: Introductionmentioning

confidence: 99%

“…51 Recent research by Zikhali et al has demonstrated that Pd-CNTs great potential for catalyzing the electro-oxidation of isopropanol and ethanol in alkaline environments. 52 Furthermore, the adsorption/desorption performance of H 2 in Mg/MgH 2 can be improved by incorporating nanocatalyst on carbon nanotubeconfined materials in situ. This synergistic approach of catalyst doping and nanoconfinement has significantly improved the de/hydriding properties of Mg/MgH 2 .…”

Section: Introductionmentioning

confidence: 99%

CNTs-Pd as Efficient Bidirectional Catalyst for Improving Hydrogen Absorption/Desorption Kinetics of Mg/MgH₂

Duan,

Wu,

Liang

et al. 2024

Energy Fuels

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The hydrogen storage potential and cost-effectiveness of MgH 2 have rendered it a desirable material for hydrogen storage. However, its application has been hindered by limitations in thermal stability and dehydrogenation kinetics. In this study, the carbon nanotube-Pd bifunctional catalyst was prepared by using hydrothermal and calcination technology, significantly improving the kinetics of Mg/MgH 2 during hydrogen adsorption/desorption. The activation energy for the Mg@ CNTs-Pd was reduced to 42.73 kJ/mol, as determined by fitting the Avrami−Erofeev model with the Arrhenius equation. Additionally, the activation energy during dehydrogenation was found to be 73.98 kJ/mol based on the Johnson−Mehl−Avrami−Kolmogorov equation and the Arrhenius equation. It is worth noting that the dynamic enhancement persists even after 10 cycles. This groundbreaking research has paved the way for potential applications of MgH 2 as a hydrogen storage material, providing it with broader development opportunities.

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Milestones of Electrocatalyst Development for Direct Alcohol Fuel Cells

Nguyen

Pham

Huynh³

et al. 2023

Advanced Sustainable Systems

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With increasing energy demands and environmental issues, renewable energy‐related conversion systems have gained significant attention as a potential substitute for traditional fossil fuel‐based energy technologies. First introduced by S.W.Grove in 1838, fuel cells have been extensively developed into many different types, and direct alcohol fuel cells (DAFCs) are of interest as a potential power source because of their large power density, quick start, simplicity, and nearly zero emission. However, the high cost and poor catalytic efficiency of current catalysts are primary barriers to commercializing DAFCs. Designing advanced nanocatalysts for both anode and cathode electrodes is of crucial importance for practical DAFC development; however, a brief evaluation of current progress in electrocatalyst development for the alcohol oxidation reaction (AOR) and oxygen reduction reaction (ORR) is still very little. Herein, recent advances in fuel cell catalysts, mainly focusing on several most active areas (i.e., Pt‐ and Pt‐free‐based catalysts, metal‐free carbon, carbon‐based nonprecious metal composites) are concisely summarized. Also, challenges and prospects for DAFCs are highlighted to supply a comprehensive view for further designing high‐performance DAFC catalysts.

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Electrocatalytic performance of Pd-based electro-catalysts supported on CNTs for isopropanol and ethanol electro-oxidation in alkaline medium

Cited by 3 publications

References 101 publications

New Insight into N,S-Doped Carbon Nanosheets Embedded with Ni/NiO Nanocluster Electrocatalysts Derived from Conjugated Polymers for the Oxidation of 2-Propanol to Acetone

New Insight into N,S-Doped Carbon Nanosheets Embedded with Ni/NiO Nanocluster Electrocatalysts Derived from Conjugated Polymers for the Oxidation of 2-Propanol to Acetone

CNTs-Pd as Efficient Bidirectional Catalyst for Improving Hydrogen Absorption/Desorption Kinetics of Mg/MgH₂

Milestones of Electrocatalyst Development for Direct Alcohol Fuel Cells

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Electrocatalytic performance of Pd-based electro-catalysts supported on CNTs for isopropanol and ethanol electro-oxidation in alkaline medium

Cited by 3 publications

References 101 publications

New Insight into N,S-Doped Carbon Nanosheets Embedded with Ni/NiO Nanocluster Electrocatalysts Derived from Conjugated Polymers for the Oxidation of 2-Propanol to Acetone

New Insight into N,S-Doped Carbon Nanosheets Embedded with Ni/NiO Nanocluster Electrocatalysts Derived from Conjugated Polymers for the Oxidation of 2-Propanol to Acetone

CNTs-Pd as Efficient Bidirectional Catalyst for Improving Hydrogen Absorption/Desorption Kinetics of Mg/MgH2

Milestones of Electrocatalyst Development for Direct Alcohol Fuel Cells

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Product

Resources

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CNTs-Pd as Efficient Bidirectional Catalyst for Improving Hydrogen Absorption/Desorption Kinetics of Mg/MgH₂