Metal oxide nanoparticles have been widely utilized for the fabrication of functional gas sensors to determine various flammable, explosive, toxic, and harmful gases due to their advantages of low cost, fast response, and high sensitivity. However, metal oxide-based gas sensors reveal the shortcomings of high operating temperature, high power requirement, and low selectivity, which limited their rapid development in the fabrication of high-performance gas sensors. The combination of metal oxides with two-dimensional (2D) nanomaterials to construct a heterostructure can hybridize the advantages of each other and overcome their respective shortcomings, thereby improving the sensing performance of the fabricated gas sensors. In this review, we present recent advances in the fabrication of metal oxide-, 2D nanomaterials-, as well as 2D material/metal oxide composite-based gas sensors with highly sensitive and selective functions. To achieve this aim, we firstly introduce the working principles of various gas sensors, and then discuss the factors that could affect the sensitivity of gas sensors. After that, a lot of cases on the fabrication of gas sensors by using metal oxides, 2D materials, and 2D material/metal oxide composites are demonstrated. Finally, we summarize the current development and discuss potential research directions in this promising topic. We believe in this work is helpful for the readers in multidiscipline research fields like materials science, nanotechnology, chemical engineering, environmental science, and other related aspects.

/pdf/the-combination-of-two-dimensional-nanomaterials-with-metal-3i39zvry.pdf

The Combination of Two-Dimensional Nanomaterials with Metal Oxide Nanoparticles for Gas Sensors: A Review

/pdf/two-dimensional-material-based-electrochemical-sensors-3hpcys9u.pdf

Two-Dimensional Material-Based Electrochemical Sensors/Biosensors for Food Safety and Biomolecular Detection

Exploring new materials with high stability and capacity is full of challenges in sustainable energy conversion and storage systems. Metal-organic frameworks (MOFs), as a new type of porous material, show the advantages of large specific surface area, high porosity, low density, and adjustable pore size, exhibiting a broad application prospect in the field of electrocatalytic reactions, batteries, particularly in the field of supercapacitors. This comprehensive review outlines the recent progress in synthetic methods and electrochemical performances of MOF materials, as well as their applications in supercapacitors. Additionally, the superiorities of MOFs-related materials are highlighted, while major challenges or opportunities for future research on them for electrochemical supercapacitors have been discussed and displayed, along with extensive experimental experiences. 

https://link.springer.com/content/pdf/10.1007/s40820-022-00910-9.pdf

Metal–Organic Framework Materials for Electrochemical Supercapacitors

A review on photo-, electro- and photoelectro- catalytic strategies for selective oxidation of alcohols

Conversion of biomass into biofuels and high value-added chemicals is a promising strategy to solve the increasingly deteriorating environmental problems caused by fossil energy consumption. The development of efficient technologies and methods is the premise and guarantee to realize the high-value conversion of biomass. 5-Hydroxymethylfurfural (HMF), as a versatile biomass platform compound, is generated via dehydration of hexoses (e.g. fructose and glucose) derived from cellulosic biomass. In the minireview, we overview the advances and challenges on electro- and photocatalytic oxidation of biomass-derived HMF to high-value chemicals such as 2,5-formylfuran (DFF) and 2,5-furandicarboxylic acid (FDCA). These strategies and methods for the preparation of high-value chemicals by electro- and photocatalytic oxidation of HMF, coupled with e.g., hydrogen evolution reaction, organic substrate reduction, CO 2 reduction reaction, or N 2 reduction reaction, are summarized and discussed. Moreover, the catalytic efficiency and mechanism of different types of catalysts were also introduced in these conversion systems.

Electro- and Photocatalytic Oxidative Upgrading of Bio-based 5-Hydroxymethylfurfural.

Flexible electrospun iron compounds/carbon fibers: phase transformation and electrochemical properties

Iron compounds have been extensively used as anode materials of lithium-ion batteries because of their low-cost and excellent electrochemical performance. However, iron compounds have a poor cyclic stability as a result of their drastic volume change in the charge/discharge processes. Herein, we propose an effective strategy to improve the cyclic performance of iron compounds by carbon coating and mixing with manganese oxide. To implement this, flexible carbon fibers embedded with Fe/Mn-based nanoparticles are produced by electrospinning with subsequent annealing process. By adjusting the annealing temperatures, the phase transformation of Fe/Mn-based compounds within carbon fibers is investigated in details. As the annealing temperature increases, Fe/Mn precursors (iron acetylacetonate and manganese acetylacetonate) in the fibers decompose gradually and then Fe3O4 and MnO nanoparticles form successively. When the temperature rises to 800 °C, the formed Fe3O4 is gradually reduced by carbon to produce Fe3C while MnO remains unchanged. The carbon fibers loaded with different Fe/Mn-based compounds (Fe3O4, Fe3O4/MnO, Fe3O4/Fe3C/MnO and Fe3C/MnO) are obtained under different annealing temperatures. Among these composites, carbon fibers loaded with Fe3O4/Fe3C/MnO nanoparticles exhibit the best specific capacity (750.23 mAh g−1 after 250 cycles) and cyclic stability, ascribing to the synergistic effect of iron and manganese compounds. Furthermore, it is found that charge transfer impedance of the anodes is reduced and Li+ diffusion ability is improved as the annealing temperature increases, which is ascribed to the increasing content of Fe3C and the short Li+ diffusion distance resulted from the reduced diameter of carbon fibers. The excellent electrochemical performance indicates that the hybrid electrospun nanofibers have a great potential application for flexible lithium-ion batteries. 

Flexible electrospun iron/manganese-based compounds/carbon fibers: Phase transformation and electrochemical properties

Iron-titanium bimetallic oxide, Fe2TiO5 (FTO), is anticipated to exhibit superior electrochemical properties due to its high theoretical capacity. However, the practical large-scale utilization of FTO is severely hindered by its substantial capacity fading and subpar cycling performance. In this work, we propose a strategy to improve the electrochemical properties of FTO by carbon coating. To implement this strategy, we synthesize FTO nanoparticles (FTO NPs) coated with reduced graphene oxide (rGO) by a solvothermal method. When used as anode materials in lithium-ion batteries, FTO/rGO composite demonstrates a higher specific capacity (498.2 mAh g−1 after 100 cycles) than pristine FTO NPs, which is ascribed to the addition of rGO. The rGO with excellent conductivity facilitates efficient electron and ion transportation, and the composite structure of FTO NPs wrapped with rGO provides buffer space to alleviate the volume expansion during the charge/discharge process. 

Graphene-wrapped Fe2TiO5 nanoparticles with enhanced performance as lithium-ion battery anode

Construction of Porous Cotio3 Microrods with Enhanced Performance as Lithium-Ion Battery Anode

Atomic Layer Deposition of NiO on Self-Supported Co3O4 Nanoneedle Array for Electrocatalytic Methanol Oxidation Reaction

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