Anodic corrosion of heteroatom doped graphene oxide supports and its influence on the electrocatalytic oxygen evolution reaction

Madan, Chetna; Sharma, Lalita; Mukerjee, Sanjeev; Halder, Aditi

doi:10.1016/j.ijhydene.2022.05.072

Cited by 14 publications

(8 citation statements)

References 81 publications

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“…Electrochemical impedance spectroscopy (EIS) was studied to understand the electrochemical nature of the samples . It can be seen in Figure c that the 20-BTRs nanocomposite shows a smaller semi-circular arc diameter than TNRs, which indicates that 20-BTRs has a high charge transfer rate and lower resistance .…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) was studied to understand the electrochemical nature of the samples. 55 It can be seen in Figure 4c that the 20-BTRs nanocomposite shows a smaller semi-circular arc diameter than TNRs, which indicates that 20-BTRs has a high charge transfer rate and lower resistance. 56 These results (photocurrent and EIS) suggest that the heterojunction formation between Bi 2 O 3 over the surface of TiO 2 rods has extended light absorption and charge generation capabilities compared to the bare TiO 2 nanorods.…”

Section: Photoelectrochemical Performancementioning

confidence: 92%

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Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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The growing world population is closely associated with the increased demand of safe drinking water and sustainable energy production. This drives the focus of the scientific community to work toward water remediation and clean energy generation. The combination of photoelectrooxidation of pollutants at the anode with simultaneous hydrogen gas production at the cathode is a smart strategy to address these problems. Herein, we have designed a bifunctional photoelectrocatalytic system consisting of a self-standing photoanode to degrade the water pollutant molecules with simultaneous production of molecular hydrogen at the cathode. The photoanode was prepared by coating Bi2O3 over the surface of self-standing TiO2 nanorods. Thus, prepared photoelectrodes show high degradation efficiency for rhodamine molecules, where direct oxidation of rhodamine by the holes generated under solar light illumination was detrimental for its activity. During simultaneous pollutant removal and energy production experiments, the anode shows 100% degradation of pollutant molecules while the cathode shows high hydrogen gas production (128 mM cm–2 h–1). The prepared composite showed higher efficiency of visible-light absorbance, high charge generation capability, and low charge transfer resistance at the interface as determined via several characterizations, compared to the bare titania. The catalyst is easy to prepare and robust in activity for several kinds of pollutant molecules tested. Its robust activity, high stability, and durability open up an avenue for the wastewater treatment with simultaneous renewable energy production technologies.

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Section: Resultsmentioning

confidence: 99%

Section: Photoelectrochemical Performancementioning

confidence: 92%

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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“…The morphology can be tailored, and the production can be scaled up to the ton scale. Despite carbon corrosion being thermodynamically expected at low potentials ( E C/CO2 = 0.21 vs the standard hydrogen electrode (SHE)), in practice this occurs at potentials above 1.2 V RHE . − The corrosion rate was reported to strongly depend on the material properties such as surface area, porosity, degree of graphitization, and heteroatom doping. − However, some of these properties can be reduced to the atomic level and the environment. Different, mainly amorphous, carbon blacks tend to show similar corrosion rates after surface-area normalization .…”

Section: What Are the Dominant Degradation Pathways In Aqueous Electr...mentioning

confidence: 99%

“…Functionalization of the carbon support with nitrogen or oxygen may augment the resistance against corrosion. ,− Although the causes of the increased stability are not yet fully understood, N- or O-doping of carbon supports has been demonstrated to have a significant stabilizing effect on the chemical structure of the carbon support and ultimately on the electrochemical activity of supported Pt nanoparticles due to improved catalyst–support interactions. ,,− …”

Section: What Are the Dominant Degradation Pathways In Aqueous Electr...mentioning

confidence: 99%

Catalyst Stability in Aqueous Electrochemistry

2022

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The main challenges in catalysis are high activity, selectivity, cost efficiency, and stability. In industrial processes, stability in particular is of pressing concern, and its importance has become more and more acknowledged in academia. At the same time, the need for alternatives to replace fossil raw materials is omnipresent, and the electrification of synthetic processes is picking up in speed. New processes are being developed and novel materials are being tested, while assessing the stability of emerging catalysts can be time-consuming and frustrating but, at the same time, highly important. This problem is exacerbated by a clear lack of realistic stability measurements of new catalysts and an understanding of the key driving forces for the specific degradation pathway. In this perspective, deactivation processes in aqueous electrochemistry are selectively discussed and mitigation strategies are presented. A special focus is placed on the intrinsic material properties that react to the surrounding environment. The applied conditions not only predefine the product spectrum and activity of the catalytic material but also strongly influence the catalyst’s stability. We review various concepts to increase the stability, for instance, by tailoring the coordination environment around the active center, and highlight the importance of the support material. The presented concepts together with stability descriptors serve as important guidelines toward stable and sustainable catalyst systems.

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“…[ 17 ] Unfortunately, the former requires an additional reduction process for the surplus V 4.5+ , while the latter causes the corrosion of anodes. [ 18 ] In addition, these two methods both consume electric energy.…”

Section: Introductionmentioning

confidence: 99%

A Bifunctional Liquid Fuel Cell Coupling Power Generation and V^3.5+ Electrolytes Production for All Vanadium Flow Batteries

et al. 2023

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All vanadium flow batteries (VFBs) are considered one of the most promising large-scale energy storage technology, but restricts by the high manufacturing cost of V 3.5+ electrolytes using the current electrolysis method. Here, a bifunctional liquid fuel cell is designed and proposed to produce V 3.5+ electrolytes and generate power energy by using formic acid as fuels and V 4+ as oxidants. Compared with the traditional electrolysis method, this method not only does not consume additional electric energy, but also can output electric energy. Therefore, the process cost of producing V 3.5+ electrolytes is reduced by 16.3%. This fuel cell has a maximum power of 0.276 mW cm −2 at an operating current of 1.75 mA cm −2 . Ultraviolet-visible spectrum and potentiometric titration identify the oxidation state of prepared vanadium electrolytes is 3.48 ± 0.06, close to the ideal 3.5. VFBs with prepared V 3.5+ electrolytes deliver similar energy conversion efficiency and superior capacity retention to that with commercial V 3.5+ electrolytes. This work proposes a simple and practical strategy to prepare V 3.5+ electrolytes.

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Anodic corrosion of heteroatom doped graphene oxide supports and its influence on the electrocatalytic oxygen evolution reaction

Cited by 14 publications

References 81 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Catalyst Stability in Aqueous Electrochemistry

A Bifunctional Liquid Fuel Cell Coupling Power Generation and V^3.5+ Electrolytes Production for All Vanadium Flow Batteries

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Anodic corrosion of heteroatom doped graphene oxide supports and its influence on the electrocatalytic oxygen evolution reaction

Cited by 14 publications

References 81 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Catalyst Stability in Aqueous Electrochemistry

A Bifunctional Liquid Fuel Cell Coupling Power Generation and V3.5+ Electrolytes Production for All Vanadium Flow Batteries

Contact Info

Product

Resources

About

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

A Bifunctional Liquid Fuel Cell Coupling Power Generation and V^3.5+ Electrolytes Production for All Vanadium Flow Batteries