High performance hierarchical SiCN nanowires for efficient photocatalytic - photoelectrocatalytic and supercapacitor applications

Reddy, I. Neelakanta; Sreedhar, Adem; Reddy, Ch. Venkata; Shim, Jaesool; Cho, Migyung; Yoo, Kisoo; Kim, Dongseob; Gwag, Jin Seog

doi:10.1016/j.apcatb.2018.06.061

Cited by 29 publications

(7 citation statements)

References 47 publications

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“…The composite paper delivers a high specific capacitance of up to 269.52 F/g at 5 A/g and a low ohmic resistance due to the unique self-supporting structure. Reddy et al [120] reported high-performance hierarchical SiCN nanowires (diameter: 23-37 nm) used for supercapacitors. These nanowires show a capacitance of 188 mF/cm at a current density of 5 mA/cm.…”

Section: Sicn Electrodes In Supercapacitorsmentioning

confidence: 99%

Si-based polymer-derived ceramics for energy conversion and storage

Wen

et al. 2022

J Adv Ceram

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Since the 1960s, a new class of Si-based advanced ceramics called polymer-derived ceramics (PDCs) has been widely reported because of their unique capabilities to produce various ceramic materials (e.g., ceramic fibers, ceramic matrix composites, foams, films, and coatings) and their versatile applications. Particularly, due to their promising structural and functional properties for energy conversion and storage, the applications of PDCs in these fields have attracted much attention in recent years. This review highlights the recent progress in the PDC field with the focus on energy conversion and storage applications. Firstly, a brief introduction of the Si-based polymer-derived ceramics in terms of synthesis, processing, and microstructure characterization is provided, followed by a summary of PDCs used in energy conversion systems (mainly in gas turbine engines), including fundamentals and material issues, ceramic matrix composites, ceramic fibers, thermal and environmental barrier coatings, as well as high-temperature sensors. Subsequently, applications of PDCs in the field of energy storage are reviewed with a strong focus on anode materials for lithium and sodium ion batteries. The possible applications of the PDCs in Li-S batteries, supercapacitors, and fuel cells are discussed as well. Finally, a summary of the reported applications and perspectives for future research with PDCs are presented.

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Section: Sicn Electrodes In Supercapacitorsmentioning

confidence: 99%

Si-based polymer-derived ceramics for energy conversion and storage

Wen

et al. 2022

J Adv Ceram

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“…In addition, the Tafel slope, exchange (j ecd ), and limiting diffusion current densities (J ldcd ), as presented in Table 2. Normally, lower Tafel slopes represent a smaller voltage requirement for the photoanode to produce photoinduced charge pairs, and j ecd and J ldcd show the charge‐transfer rate of the photoanode and the coefficient of diffusion, respectively 25 . Nevertheless, Tafel plots would be interpreted cautiously because Tafel slopes vary in a compound manner contingent on several factors, including the reaction pathway, catalyst preparation method, adsorption state, and photoelectrode type 26 .…”

Section: Resultsmentioning

confidence: 99%

“…Normally, lower Tafel slopes represent a smaller voltage requirement for the photoanode to produce photoinduced charge pairs, and j ecd and J ldcd show the charge-transfer rate of the photoanode and the coefficient of diffusion, respectively. 25 Nevertheless, Tafel plots would be interpreted cautiously because Tafel slopes vary in a compound manner contingent on several factors, including the reaction pathway, catalyst preparation method, adsorption state, and photoelectrode type. 26 As a result, at 0 h immersion time, the photoanodes showed the lowest Tafel slopes, indicating that the samples may require less potential to generate charge carriers.…”

Section: Resultsmentioning

confidence: 99%

Photochemical environment effect on V ₂ O ₅ ‐Fe ₂ O ₃ heterostructures for efficient water splitting under visible light

Reddy

Shim

Bai

2022

Intl J of Energy Research

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Summary To enhance eco‐friendly energy generation from photoelectrochemical water splitting, the photoanode should be immersed in a photochemical environment for a long time. Here, V2O5 surfaces modified with Fe2O3 nanoparticles were synthesized using a simple method, and the stability of the synthesized photoanodes in a 0.1 M Na2SO3 electrolyte was investigated. The heterostructure was subjected to dark and light conditions, and their effect on the optical properties and kinetic behavior of the photoanode was analyzed. The V2O5‐Fe2O3 heterostructures showed better light absorption than the pristine V2O5 and Fe2O3 structures. At 0 h immersion, the maximum photocurrent density was 0.25 mAcm−2 for the V2O5‐Fe2O3 photoanodes, which was 8‐fold and 5‐fold that of the V2O5 and Fe2O3 photoanodes, respectively, in the 0.1 M Na2SO3 electrolyte. Furthermore, the V2O5‐Fe2O3 photoanode exhibited the lowest charge‐transfer resistance (3.75 Ω) and Tafel slope (68.1 mV·dec−1). After immersion for 96 h in the 0.1 M Na2SO3 electrolyte, the V2O5‐Fe2O3 photoanode showed a significant decrease in photocurrent density, which could be owing to the shrinkage of active sites in the photoanode and increased charge‐transfer resistance, exchange current density, limiting current density, and Tafel slope. Thus, the photochemical environment has a critical role in the photo‐induced currents of the photoanode under illumination conditions.

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“…Reproduced with permission. [ 200 ] Copyright 2018, Elsevier. c) Schematic illustration of the exfoliation of bulk Ni 2 [CuPc(NH) 8 ] c‐MOF into 2D nanosheets by NaCl assisted ball‐milling method; the TEM images and capacitance retention in the alternative flat and bent configurations after long cycles.…”

Section: Mechanochemistry For Energy Conversion and Storage Applicationsmentioning

confidence: 99%

“…[ 199 ] Reddy et al. [ 200 ] reported that N doped silicon carbide (SiCN) nanowire electrodes were synthesized by a combination of high‐energy ball‐milling and postreaction heat treatment, as shown in Figure 10b. The obtained SiCN nanowires had cubic crystal phases with diameters in the range of 23–37 nm.…”

Section: Mechanochemistry For Energy Conversion and Storage Applicationsmentioning

confidence: 99%

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

et al. 2022

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high volatility, and poor security, renewable energy must be converted and stored before it can be stably and efficiently used. [2] Energy conversion refers to the conversion of one form of energy to another form, or several forms. This is achieved through energy conversion devices and corresponding technologies. The core part of energy conversion devices is the active material, which is also the key to providing high conversion efficiency. Chemical synthesis is usually employed for the preparation of various energy conversion active materials, which can be divided into four major categories in terms of reaction principles: thermochemistry, electrochemistry, mechanochemistry, and photochemistry. Among them, mechanochemistry is the study of chemical reactions induced by mechanical energy. [3] Mechanochemical syntheses can be carried out under a variety of conditions, such as at low temperatures, in inert or reactive atmospheres, under high gas pressures, in a solvent or under all-solid-state conditions. Thus, mechanochemical techniques are simple, versatile, and sustainable. Mechanochemistry can be used to develop new methods for some chemical reactions that are difficult to be realized by conventional chemical synthesis.Mechanochemistry was first reported with the development of grinding technology. As early as 315 B.C., Aristotle's students demonstrated for the first time that elemental Hg could be obtained by grinding cinnabar and acetic acid in a mortar. [4] For several decades, the development of mechanochemistry has become more comprehensive and systematic, and mechanochemical methods have been widely used in the fields of inorganic and organic materials, magnetic materials, and metallurgy. Mechanochemical equipment has evolved from the original manual mortar and pestle to a variety of novel mechanized instruments. Mechanochemical techniques including ballmilling, pan-milling, and ultrasonic irradiation have been successfully applied to prepare advanced functional materials for energy conversion and storage. However, most recent surveys/ reviews regarding mechanochemical technologies for material preparation are mainly focused on ball-milling. [3,[5][6][7][8] Recently, the unique advantages of mechanochemistry for energy storage and conversion applications have inspired Mechanochemistry with solvent-free and environmentally friendly characteristics is one of the most promising alternatives to traditional liquid-phase-based reactions, demonstrating epoch-making significance in the realization of different types of chemistry. Mechanochemistry utilizes mechanical energy to promote physical and chemical transformations to design complex molecules and nanostructured materials, encourage dispersion and recombination of multiphase components, and accelerate reaction rates and efficiencies via highly reactive surfaces. In particular, mechanochemistry deserves special attention because it is capable of endowing energy materials with unique characteristics and properties. Herein, the latest advances and progress in me...

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High performance hierarchical SiCN nanowires for efficient photocatalytic - photoelectrocatalytic and supercapacitor applications

Cited by 29 publications

References 47 publications

Si-based polymer-derived ceramics for energy conversion and storage

Si-based polymer-derived ceramics for energy conversion and storage

Photochemical environment effect on V ₂ O ₅ ‐Fe ₂ O ₃ heterostructures for efficient water splitting under visible light

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

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High performance hierarchical SiCN nanowires for efficient photocatalytic - photoelectrocatalytic and supercapacitor applications

Cited by 29 publications

References 47 publications

Si-based polymer-derived ceramics for energy conversion and storage

Si-based polymer-derived ceramics for energy conversion and storage

Photochemical environment effect on V 2 O 5 ‐Fe 2 O 3 heterostructures for efficient water splitting under visible light

A Review on Mechanochemistry: Approaching Advanced Energy Materials with Greener Force

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Photochemical environment effect on V ₂ O ₅ ‐Fe ₂ O ₃ heterostructures for efficient water splitting under visible light