pH dependent kinetic insights of electrocatalytic arsenite oxidation reactions at Pt surface

Hasnat, Mohammad A.; Hasan, Mohammad Monirul; Tanjila, Nahida; Alam, Mahbubul; Rahman, M. Hamidur

doi:10.1016/j.electacta.2016.12.055

Cited by 27 publications

(15 citation statements)

References 42 publications

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“…AA oxidation shifted positively with increased concentration, which can be denoted as a diffusion-controlled reaction. [12] This shift is attributable to a disturbance of the mass transport processes of the analyte. The current can be explainable by the mass transport of analyte from the bulk of the solution to the electrode surface.…”

Section: Electrocatalytic Activitymentioning

confidence: 99%

“…[11] To form different metal nanostructures, electrochemical deposition techniques had been used on different substrates, particularly on a glassy carbon electrode (GCE) surface. [12,13] The GCE is widely employed for electrochemical deposition of metal nanostructures because of its chemical inertness, impermeability to gases and liquids, and high-temperature resistance. [14] Pre-modification of the GCE electrodes or additives in the electrolytes is necessary in certain cases for preparing metal nanostructures through electro-chemical deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical deposition is a process that offers an alternative pathway for the fabrication of clean metal nanostructure surfaces [11] . To form different metal nanostructures, electrochemical deposition techniques had been used on different substrates, particularly on a glassy carbon electrode (GCE) surface [12,13] . The GCE is widely employed for electrochemical deposition of metal nanostructures because of its chemical inertness, impermeability to gases and liquids, and high‐temperature resistance [14] .…”

Section: Introductionmentioning

confidence: 99%

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Christmas‐Tree‐Shaped Palladium Nanostructures Decorated on Glassy Carbon Electrode for Ascorbic Acid Oxidation in Alkaline Condition

Hasan

Nagao

2021

ChemistrySelect

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Christmas-tree-shaped Pd nanostructures were synthesized using a simple one-step electrodeposition method with no additives on a glassy carbon electrode (GCE) surface. Growth of the hierarchical nanostructures was optimized through the applied potential, deposition time, and precursor concentration. Comprehensive characterization techniques such as scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), Xray powder diffraction (XRD), and cyclic voltammetry (CV) were used to characterize structural features of the Christmas-treeshaped Pd nanostructures. Our Christmas-tree-shaped Pd nanostructures showed excellent catalytic activity for ascorbic acid (AA) electro-oxidation in the alkaline condition. The modified electrode exhibited current density of 4.5 mA cm À 2 : much higher than that of unmodified GCE (0.6 mA cm À 2 ). This simple electrodeposition technique with well-defined hierarchical Pd nanostructures is expected to offer new perspectives using Pdbased nanostructured surfaces in different research areas.

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Section: Electrocatalytic Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Christmas‐Tree‐Shaped Palladium Nanostructures Decorated on Glassy Carbon Electrode for Ascorbic Acid Oxidation in Alkaline Condition

Hasan

Nagao

2021

ChemistrySelect

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“…[18][19][20][21] Its noteworthy that the principle of the oxidation process is based on the conversion of As(III) into a stable product As(V) by releasing two electrons. [22][23][24] However, since As(III) species are more soluble and mobile than As(V) species, development of electrode materials for the conversion of As(III) to As(V) regarding detection, determination, and removal is still a challenge. To date, several articles have been published on the electrochemical and electrokinetic studies of As(III) electro-oxidation using Pt, Au, Hg, indium tin oxide (ITO) coated glass and carbon-based materials.…”

Section: Introductionmentioning

confidence: 99%

“…To date, several articles have been published on the electrochemical and electrokinetic studies of As(III) electro-oxidation using Pt, Au, Hg, indium tin oxide (ITO) coated glass and carbon-based materials. 16,17,[22][23][24][25][26][27][28][29][30][31] In this context, to the best of our knowledge, very few research groups have worked on the applicability of palladium as an electrocatalyst for As(III) electro-oxidation. 22 Moreover, contemporary scientists and technologists are paying much attention to minimizing the usage of precious metals as catalysts by developing porosity in the catalytic matrix since this approach can improve the active catalytic area.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical oxidation of As(iii) on Pd immobilized Pt surface: kinetics and sensing performance

et al. 2018

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Asymmetric Redox‐Polymer Interfaces for Electrochemical Reactive Separations: Synergistic Capture and Conversion of Arsenic

et al. 2019

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in water as anionic arsenate (As(V)) or arsenite (As(III)), with the latter being acutely toxic and difficult to remove. [3] Commonly employed techniques to remove arsenic are coagulation-flocculation or chemical adsorption, both which require significant chemical input, and extensive pretreatment steps for As(III) to As(V) conversion. [3c] Thus, novel removal technologies that integrate removal and conversion of arsenic are critical for sustainable environmental management.The development of advanced materials for water purification, selective contaminant removal, and improved energy efficiency is critical to tackling water-energy nexus challenges, including through the design of more effective membranes and field-assisted adsorbents. [4] Electrochemical methods for water treatment such as capacitive deionization (CDI) have garnered increased attention as a desalination technology, and also as a heavy metal removal platform, due to their efficiency and low environmental footprint compared to typical methods. [5] Electrosorption systems benefit from inherent modularity and scalability, which opens the door to point of source remediation systems. Electrochemical conversion of As(III) to As(V) on carbon electrode has been investigated previously for CDI-based arsenic remediation. [5l,6] However, low arsenic selectivity in the presence of competing ions has limited the total uptake capacity of carbon-based CDI, [5c,h-l] as most arsenic contaminated water sources are composed of 10 to 1000-fold excess salts. [7] Thus, the design of molecularly selective functional adsorbents is necessary to address these materials chemistry limitations.Recent work has shown redox-active/Faradaic materials as an attractive platform for selective water contaminant removal. [8] Redox-active metallopolymers have demonstrated remarkable uptake of anions with significant selectivity, both of organic anions and heavy metal oxyanions. [8b,9] At the same time, asymmetric electrochemical systems have traditionally been proposed in energy-storage applications to enhance capacitance and electrochemical properties. [10] Here, we leverage this electrochemical design for the first time to integrate both the separation and the reactions step electrochemically at functionalized electrodes. We seek to combine two redox-active polymer Advanced redox-polymer materials offer a powerful platform for integrating electroseparations and electrocatalysis, especially for water purification and environmental remediation applications. The selective capture and remediation of trivalent arsenic (As(III)) is a central challenge for water purification due to its high toxicity and difficulty to remove at ultra-dilute concentrations. Current methods present low ion selectivity, and require multistep processes to transform arsenic to the less harmful As(V) state. The tandem selective capture and conversion of As(III) to As(V) is achieved using an asymmetric design of two redox-active polymers, poly(vinyl)ferrocene (PVF) and poly-TEMPO-methacrylate (PTMA). D...

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pH dependent kinetic insights of electrocatalytic arsenite oxidation reactions at Pt surface

Cited by 27 publications

References 42 publications

Christmas‐Tree‐Shaped Palladium Nanostructures Decorated on Glassy Carbon Electrode for Ascorbic Acid Oxidation in Alkaline Condition

Christmas‐Tree‐Shaped Palladium Nanostructures Decorated on Glassy Carbon Electrode for Ascorbic Acid Oxidation in Alkaline Condition

Electrochemical oxidation of As(iii) on Pd immobilized Pt surface: kinetics and sensing performance

Asymmetric Redox‐Polymer Interfaces for Electrochemical Reactive Separations: Synergistic Capture and Conversion of Arsenic

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