Advances in the design and assembly of flexible thermoelectric device

Conducting polymer-based flexible thermoelectric materials and devices: From mechanisms to applications

Bi Dots Confined by Functional Carbon as High-Performance Anode for Lithium Ion Batteries

Tuning of graphitic carbon nitride (g-C3N4) for photocatalysis: A critical review

Materials that enable bifunctional operation in harvesting and storing energy are currently in high demand, due to their potential to efficiently use renewable solar energy. Here, we present a lead-free, all-inorganic, bismuth-based perovskite halide, which acts as a photoelectrode that can harvest energy under illumination without the assistance of an external load in a lithium-ion battery. The battery performance is shown using three different current collectors: copper, fluorine-doped tin oxide (FTO) and carbon felt (CF) to exhibit the electrode's function as a normal coin cell, as a basic photobattery with a transparent collector to elucidate its functional mechanism, and as an optimized photobattery displaying competitive metrics with other photobatteries obtaining a photo conversion efficiency of ∼0.43% for the first discharge. Upon discharging under illumination, we observed an increase in capacity from 410 to 975 mA·h·g-1. Further exploration in anode structure and design provides a path toward more efficient photobatteries.

Photorechargeable Lead-Free Perovskite Lithium-Ion Batteries Using Hexagonal Cs3Bi2I9 Nanosheets.

Flexible thermoelectric materials and devices have gained wide attention due to their capability to stably and directly convert body heat or industrial waste heat into electric energy. Many research and synthetic methods of flexible high-performance p-type thermoelectric materials have made great progress. However, their counterpart flexible n-type organic thermoelectric materials are seldom studied due to the complex synthesis of conductive polymer and poor stability of n-type materials. In this work, bismuth tellurium (Bi2Te3) nanosheets are in situ grown on single-walled carbon nanotubes (SWCNTs) assisted by poly(vinylpyrrolidone) (PVP). A series of flexible SWCNTs@Bi2Te3 composite films on poly(vinylidene fluoride) (PVDF) membranes are obtained by vacuum-assisted filtration. The high electrical conductivity of 253.9 S/cm, and a corresponding power factor (PF) of 57.8 μW/m·K2 is obtained at 386 K for SWCNTs@Bi2Te3-0.8 film. Moreover, high electrical conductivity retention of 90% can be maintained after a 300-cycle bending test and no obvious attenuation can be detected after being stored in an Ar atmosphere for 9 months, which exhibits good flexibility and excellent stability of the SWCNTs@Bi2Te3 composite films. This work shows a convenient method to fabricate n-type and flexible thermoelectric composite film and further promotes the practical application of n-type flexible thermoelectric materials.

Flexible Thermoelectric Films Based on Bi2Te3 Nanosheets and Carbon Nanotube Network with High n-Type Performance.

Nanostructuring strategies have immensely improved energy storage performance for Li ion batteries. However, the consequent low tap density and the severe side reaction caused by excessive specific surface area make it difficult for nanomaterials to exhibit satisfactory performance in their practical applications. Herein, inspired by the structural characteristics of egg cartons, a rational nanomicro structure was designed to address these problems. Specifically, compact micron-size 2D dimpled carbon frameworks (cartons) with densely distributed bismuth nanoparticles (eggs) were prepared via large-scale pyrolysis methods. The composite electrode exhibits a high volumetric capacity of 1461 mA h cm–3 at 100 mA g–1, which can outperform all reported Bi-based anodes so far and even be comparable to prevailing Si-based anodes. Furthermore, a high capacity retention of 89% can be maintained after 1000 cycles at 1 A g–1. The excellent electrochemical lithium-storage performances are attributed to the unique egg-...

Large-Scale Fabrication of Egg-Carton-Inspired Bi/C Composite toward High Volumetric Capacity and Long-Life Lithium Ion Batteries

Glucose oxidase, which uses molecular oxygen as an electron acceptor to specifically catalyze the conversion of β-d-glucose to gluconic acid and hydrogen peroxide (H2O2), has been considered an important enzyme in increasing environmental sustainability and food security. However, achieving the high yield, low price and high activity required for commercial viability remains challenging. In this review, we first present a brief introduction, looking at the sources, characteristics, catalytic process, and applications of glucose oxidase. Then, the predictive structures of glucose oxidase from two different sources are comparatively discussed. We summarize the inhibitors of glucose oxidase. Finally, we highlight how the production of glucose oxidase can be improved by optimizing the culture conditions and microbial metabolic engineering.

/pdf/insights-into-the-structures-inhibitors-and-improvement-1ww5lqgc.pdf

Insights into the Structures, Inhibitors, and Improvement Strategies of Glucose Oxidase

In this paper, a novel pristine carbon nitride (np-CN) with hollow capsule-like morphology was facilely prepared by thermal polymerization of melamine and cyanuric chloride at 550 ℃ in the air...

Modified on graphite carbon nitride by adding ultramicro amount of triaminotriphenylamine for superior photocatalytic hydrogen evolution

The hydroxyl groups in the amino acid residues of echinocandin B were related to the biological activity, the instability, and the drug resistance. The modification of hydroxyl groups was expected to obtain the new lead compounds for next generation of echinocandin drug development. In this work one method for heterologous production of the tetradeoxy echinocandin was achieved. A reconstructed biosynthetic gene cluster for tetradeoxy echinocandins composed of ecdA/I/K and htyE was designed and successfully hetero-expressed in Aspergillus nidulans. The target product of echinocandin E (1) together with one unexpected derivative echinocandin F (2), were isolated from the fermentation culture of engineered strain. Both of compounds were unreported echinocandin derivatives and the structures were identified on the basis of mass and NMR spectral data analysis. Compared with echinocandin B, echinocandin E demonstrated superior stability and comparable antifungal activity.

Unnatural tetradeoxy echinocandins produced by gene cluster design and heterologous expression.

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