Fabrication and electrochemical kinetics studies of reduced carbon quantum dots- supported palladium nanoparticles as bifunctional catalysts in methanol oxidation and hydrogen evolution reactions

Javan, Hakimeh; Asghari, Elnaz; Ashassi-Sorkhabi, Habib

doi:10.1016/j.synthmet.2019.06.006

Cited by 34 publications

(7 citation statements)

References 91 publications

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“…The achieved current density ( j a ), where there is a leveling off after the first ascending branches, was characterized as the limiting anode current density ( j l ). And then the current density increased sharply after the leveling off, which is explained by the higher potential with the enhanced of oxygen evolution. , To confirm the control step for the leaching process, the appropriate initial section of polarization curves in Figure a were reorganized in the coordinates of reaction overpotential relationship as a function of the current density logarithm in eq and eq where b is the Tafel slope and a is a parameter related to the exchange current density.…”

Section: Resultsmentioning

confidence: 99%

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO₄

Zheng

Zhu³

et al. 2020

ACS Sustainable Chem. Eng.

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An environment friendly and cost-effective process has been developed for production of LiOH from spent LFP cathode material. By using a suspension electrolysis system comprising an electrodialysis process, the spent LFP cathode material was oxidized and released lithium ion in the anode chamber, which is similar to that in the charging of an LFP battery. More than 95% of Li was leached and the current efficiency can reach up to 85.81%. And then the resulting lithium ion was migrated through the cation-exchange membrane and generated LiOH with OH– in the cathode chamber. High purity LiOH solution could be obtained due to the impurities in anode chamber being insulated by the monovalent permselectivity cation-exchange membrane. Kinetics analysis indicates that the delithiation process on the anode electrode was divided into two stages. In the first stage, the reaction rate was limited by the electrochemistry. Thereafter, it was controlled by the diffusion in the second stage. Finally, LiOH·H2O can be directly produced after evaporative crystallization via vacuum evaporation. A green close-loop process was then proposed, in which very little solid waste or wastewater is generated. Compared with other recovery processes, the proposed process has the highest profit due to the production of LiOH·H2O which is more valuable and no chemical regents being consumed.

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Section: Resultsmentioning

confidence: 99%

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO₄

Zheng

Zhu³

et al. 2020

ACS Sustainable Chem. Eng.

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“…Additionally, graphene sheets can be used as excellent host materials for growing nanomaterials . Inorganic graphene analogues, such as modified or (Pt, Au, and Pd) nanoparticle (NP)-integrated graphene sheets help in achieving high carrier mobility and enhancement in the active surface area. − Among the metal NPs, platinum (Pt) NPs have been paid special attention because of their morphology-dependent electrocatalytic activities, optical properties, fast electron transfer in the electrode surface, and biocompatibility. Most importantly, the shape and size of the Pt NPs can be easily controlled during the synthesis.…”

Section: Introductionmentioning

confidence: 99%

Facile Green Approach for Developing Electrochemically Reduced Graphene Oxide-Embedded Platinum Nanoparticles for Ultrasensitive Detection of Nitric Oxide

et al. 2021

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Nitric oxide (NO) plays a crucial and important role in cellular physiology and also acts as a signaling molecule for cancer in humans. However, conventional detection methods have their own limitations in the detection of NO at low concentrations because of its high reactivity and low lifetime. Herein, we report a strategy to fabricate Pt nanoparticle-decorated electrochemically reduced graphene oxide (erGO)-modified glassy carbon electrode (GCE) with efficiency to detect NO at a low concentration. For this study, Pt@erGO/GCE was fabricated by employing two different sequential methods [first GO reduction followed by Pt electrodeposition (SQ-I) and Pt electrodeposition followed by GO reduction (SQ-II)]. It was interesting to note that the electrocatalytic current response for SQ-I (184 μA) was ∼15 and ∼3 folds higher than those of the bare GCE (11.7 μA) and SQ-II (61.5 μA). The higher current response was mainly attributed to a higher diffusion coefficient and electrochemically active surface area. The proposed SQ-I electrode exhibited a considerably low LOD of 52 nM (S/N = 3) in a linear range of 0.25–40 μM with a short response time (0.7 s). In addition, the practical analytical applicability of the proposed sensor was also verified.

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“…45 The durability of the modified electrode is one of the most characteristic properties of HER electrocatalysts due to continuous hydrogen evolution, which often results in leaching the electrode materials and possible electrode poisoning especially in an acidic electrolyte. 46 In this regard, a longterm stability test of the model electrode 7C is scrutinized by chronoamperometric technique by charging the electrode at the respective overpotential and measuring the corresponding current response. Figure 4B displays the current density measurements at the overpotential for 12 h, and the current density at the end of the measurement shows a retention of ca.…”

Section: Electrochemical Hydrogen Evolution Reactionmentioning

confidence: 99%

Enhancing Electrochemical Hydrogen Evolution Performance of N-Heterocyclic Carbene-Coordinated Palladium(II) Complexes with Conductive Carbon: Insights from Hydrogen Oxidation Reactions

Yhobu,

Markandeya,

Małecki

et al. 2024

ACS Appl. Energy Mater.

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The systematic design of molecular electrocatalysts for electrochemical hydrogen evolution reaction (HER) is an avenue that is still relatively unexplored. Palladium (Pd)-based molecular electrocatalysts were constructed from N-heterocyclic carbene functionalized with 1allyl-1,2,4-triazole and coumarins. The role of coumarin substitutions on the activity of the electrocatalysts for HER in an acidic medium was assessed. The Pd complex bearing 7,8benzocoumarin substitutions was found to exhibit the best activity with overpotential of −570 mV to attain a current density of 10 mA cm −2 with a Tafel slope value of 187 mV dec −1 . The HER activity of the Pd complexes were improved by incorporating with conductive carbon with the best electrode exhibiting an improved overpotential of −468 mV and Tafel slope value of 161 mV dec −1 . The developed electrocatalyst demonstrated exceptional stability for up to 12 h, with minimal efficiency decline, as evidenced by post-stability linear sweep analysis. Additionally, the post-HER analysis indicates the structural and molecular integrity of the electrocatalysts, reaffirming their prospects as models for designing electrocatalysts. Hydrogen oxidation reaction (HOR) studies were conducted by using a rotating ring disk electrode setup. The concurrent current responses of the disk and ring electrodes confirmed the HER activity of the prepared electrocatalysts.

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Fabrication and electrochemical kinetics studies of reduced carbon quantum dots- supported palladium nanoparticles as bifunctional catalysts in methanol oxidation and hydrogen evolution reactions

Cited by 34 publications

References 91 publications

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO₄

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO₄

Facile Green Approach for Developing Electrochemically Reduced Graphene Oxide-Embedded Platinum Nanoparticles for Ultrasensitive Detection of Nitric Oxide

Enhancing Electrochemical Hydrogen Evolution Performance of N-Heterocyclic Carbene-Coordinated Palladium(II) Complexes with Conductive Carbon: Insights from Hydrogen Oxidation Reactions

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Fabrication and electrochemical kinetics studies of reduced carbon quantum dots- supported palladium nanoparticles as bifunctional catalysts in methanol oxidation and hydrogen evolution reactions

Cited by 34 publications

References 91 publications

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO4

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO4

Facile Green Approach for Developing Electrochemically Reduced Graphene Oxide-Embedded Platinum Nanoparticles for Ultrasensitive Detection of Nitric Oxide

Enhancing Electrochemical Hydrogen Evolution Performance of N-Heterocyclic Carbene-Coordinated Palladium(II) Complexes with Conductive Carbon: Insights from Hydrogen Oxidation Reactions

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A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO₄

A Green and Cost-Effective Method for Production of LiOH from Spent LiFePO₄