頭頸部手術におけるエネルギーデバイスの活用

Borophene is a two-dimensional material that has shown outstanding applications in energy storage devices and analytical chemistry.

Bacterial cellulose materials in sustainable energy devices: A review

Zinc–Tin Oxide (ZTO) films potentially offer desirable properties for next-generation devices and are considered promising candidates due to the following merits: (I) zinc and tin are abundant on Earth, with estimated reserves of approximately 250 million tons and 4.3 billion tons, respectively, (II) zinc and tin are harmless to the human body, and (III) large-area manufacturing with various synthesis processes is available. Considering the advantages and promises of these ZTO films, this review provides a timely overview of the progress and efforts in developing ZTO-based electronic and energy devices. This review revisits the ZTO films used for various device applications, including thin-film transistors, memory devices, solar cells, and sensors, focusing on their strong and weak points. This paper also discusses the opportunities and challenges for using ZTO films in further practical electronic and energy device applications.

The excessive consumption of fossil energy caused an energy crisis and a series of environmental issues. Therefore, it is necessary to develop sustainable and clean energy sources. Electrocatalysts play an important role in the development of various new energy devices; in particular, high-efficiency and low-cost catalysts are essential for the large-scale application of these new devices. Among the many electrocatalysts, metal chalcogenides (sulfides, selenides, and tellurides) as emerging materials own abundant active sites and good electrical conductivity and are widely studied for their excellent electrocatalytic performances. This Perspective reviews the recent applications of metal chalcogenide materials in electrocatalysis, including hydrogen evolution reaction, oxygen evolution reaction, and electrolyzing water and specifically summarizes different optimization strategies and catalytic reaction mechanisms. The several regulation strategies include heteroatom doping, phase engineering, heterostructures, and hybrid materials, which are capable of improving conductivity, increasing active site exposure, and reducing the energy barrier of catalytic reactions to enhanced electrocatalytic performances. In Sec. IV, the existing problems and future challenges are proposed for the improvement of catalytic performance of metal chalcogenide materials, which provide an insight into and valuable guidelines for the future development of high-efficiency and low-cost electrocatalysts for new energy devices.

Malvern releases guidance on automated imaging for agglomerate detection

Replacement of rare and precious metal catalysts with low-cost and earth-abundant ones is currently among the major goals of sustainable chemistry. Herein, we report the synthesis of S, N dual-doped graphene-like carbon nanosheets via a simple pyrolysis of a mixture of melamine and dibenzyl sulfide as efficient metal-free electrocatalysts for oxygen reduction reaction (ORR). The S, N dual-doped graphene-like carbon nanosheets show enhanced activity toward ORR as compared with mono-doped counterparts, and excellent durability in contrast to the conventional Pt/C electrocatalyst in both alkaline and acidic media. A high content of graphitic-N and pyridinic-N is necessary for ORR electrocatalysis in the graphene-like carbon nanosheets, but an appropriate amount of S atoms further contributes to the improvement of ORR activity. Superior ORR performance from the as-prepared S, N dual-doped graphene-like carbon nanosheets implies great promises in practical applications in energy devices.

ADVERTISEMENT RETURN TO ISSUEEditorialNEXTJoint Forum on Halide Perovskite Materials and Devices for Energy and Electronic ApplicationsSuchismita GuhaSuchismita GuhaMore by Suchismita Guhahttps://orcid.org/0000-0002-6269-2298 and Gerrit BoschlooGerrit BoschlooMore by Gerrit Boschloohttps://orcid.org/0000-0002-8249-1469Cite this: ACS Appl. Electron. Mater. 2023, 5, 10, 5258–5260Publication Date (Web):October 24, 2023Publication History Received18 September 2023Published online24 October 2023Published inissue 24 October 2023https://pubs.acs.org/doi/10.1021/acsaelm.3c01305https://doi.org/10.1021/acsaelm.3c01305editorialACS PublicationsCopyright © 2023 American Chemical Society. This publication is available under these Terms of Use. Request reuse permissions This publication is free to access through this site. Learn MoreArticle Views356Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail PDF (975 KB) Get e-AlertscloseSUBJECTS:Ions,Layers,Materials,Perovskites,Solar cells Get e-Alerts

The recent discovery of hydrovoltaic devices for power generation has led to a rapid growth into new materials for harvesting energy specifically for this research field. Of the materials investigated, carbon materials have dominated, and graphene oxide (GO) has emerged as the leader. While graphite is conductive, it does not have functional groups to strongly interact with water, and highly functionalized GO forms strong interaction with water to generate necessary surface charges but does not typically have high conductivity. Herein, we report the fabrication and functionalization of a graphite-based structure, controlling the extent of oxidation to balance the effects of conductivity and functionalization to achieve high power outputs in hydrovoltaics. Devices prepared using the functionalized graphite achieve a power output of 53.3 μW/g. High power output and good film stability are key advances toward the practical application of hydrovoltaic devices for renewable energy.

This study investigates the combined stability and sensitivity study of MHD radiative squeezed hybrid nanofluid flow between two parallel circular porous disks. Although numerous studies have examined magnetohydrodynamic (MHD) flows, thermal radiation effects, squeezed-flow configurations, and nanofluids in porous media, existing literature typically addresses these effects in isolation or in simplified combinations. Most prior works have focused on single-nanoparticle nanofluids, neglecting the enhanced thermo-physical behavior of hybrid nanofluids containing two different nanoparticles. The hybrid nanofluid comprises a base fluid embedded with two distinct nanoparticles, enhancing its thermal and flow properties. Several complex interactions including magnetic fields, thermal radiation, resistance in porous media, and squeezing effects influence the flow and thermal characteristics. A system of nonlinear partial differential equations is constructed and then converted into a dimensionless form through the application of similarity transformations. Subsequently, the dimensionless equations are solved using a power series method, and the resulting solutions are analyzed through the Hermite–Padé approximation scheme. A comparison between the current data and a published result has been made with a good agreement. The effect of flow parameters such as porosity parameter, squeeze number, Prandtl number, Eckert number, and radiation parameter on velocity and temperature fields is illustrated graphically. The skin friction coefficient and local heat transfer rate are also evaluated for the relevant physical parameters. The stability of the local heat transfer rate is examined through a bifurcation curve, which indicates that the lower branch represents a stable and physically realizable solution, while the upper branch corresponds to an unstable state. Sensitivity analysis is performed to measure the influence of key dimensionless parameters such as the squeeze number, porosity parameter, and radiation parameter on the local Nusselt number and the result of our model is significant. This work has potential applications in thermal management systems, energy devices, and advanced cooling technologies.

Development of Polymer Composite Films Dispersed with Functionalized Sio2 for Application in Energy Devices

Heteroatom-doped carbon nanomaterials have attracted significant attention as anode materials for sodium-ion batteries (SIBs). Herein, we demonstrate a conjugated polymer-mediated synthesis of sulfur and nitrogen co-doped carbon nanotubes (S/N-CT) via the carbonization of sulfur-containing polyaniline (PANI) nanotubes. It is found that the carbonization technique greatly influences the structural features and thus the Na-storage behavior of the S/N-CT materials. The carbon nanotubes developed using a two-step carbonization process (heating at 400 °C and then at 900 °C) exhibit a high specific surface area, enlarged interlayer distance, small charge transfer resistance, enhanced reaction kinetics, as well as a large number of defects and active sites; further, they exhibit a high reversible capacity of 340 mAh·g–1 at 0.1 A·g–1 and a remarkable cycling stability with a capacity of 141 mAh·g–1 at 5 A·g–1 (94% retention after 3,000 cycles). Direct carbonization of conjugated polymers with a specific morphology is an eco-friendly and low-cost technique for the synthesis of dual atom-doped carbon nanomaterials for application in energy devices. However, the carbonization process should be carefully controlled in order to better tune the structure–property relationship.

The more versatile engineering application of silicon carbide (SiC) ceramics is impeded by their innate low fracture toughness and high brittleness. To overcome such bottleneck and among others, retrofitting SiC with graphene-based additives has recently proved to be a practical way to attain modified SiC with augmented damage resistance. Nonetheless, the above-mentioned approach received less attention from computational modeling perspective. In that regard, the current study proposes a multiscale computational approach to further investigate the damage mechanics of SiC ceramics with graphene inclusions. First, ReaxFF molecular dynamics simulations are conducted to extract the interfacial properties (i.e., cohesive zone) of the graphene-SiC ceramics. Then, the fracture and crack propagation of the hybrid graphene-SiC composites subjected to tensile loading are investigated using the phase field model of fracture in conjunction with the identified cohesive zone properties. Corroborated by some of the available experimental evidence from the existing reports, the numerical results evince that (a) complete fracture of the hybrid material is de facto delayed by embedding the graphene additives, (b) higher resistance to complete fracture is obtained by increasing volume fraction and utilizing graphene inclusion with larger sizes, and (c) for a certain volume fraction ( v f = 0.375%), double layer graphene inclusion would slightly outperform the single layer graphene in terms of enhancing the fracture resistance of SiC ceramic composite. Further, the influences of the ambient temperature, defect location, and defect density (single defect versus multiple defects) on the fracture of the graphene-SiC composites are also addressed. The proposed approach and findings of this study offer insights into the bottom-up design pathways for developing multifunctional and damage-tolerant novel ceramic matrix composites for applications in structural engineering, energy devices, defense, and aerospace industries.

Chemical state of surrounding iron species affects the activity of Fe-Nx for electrocatalytic oxygen reduction

One-step synthesis of continuous free-standing Carbon Nanotubes-Titanium oxide composite films as anodes for lithium-ion batteries

N, P, and S tri-doped holey carbon as an efficient electrocatalyst for oxygen reduction in whole pH range for fuel cell and zinc-air batteries