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Energy crises and global warming pose serious challenges to researchers in their attempt to develop a sustainable society for the future. Solar energy conversion is a remarkable, clean, and sustainable way to nullify the effects of fossil fuels. The findings of photocatalytic hydrogen production (PCHP) by Fujishima and Honda propose that “water will be the coal for the future”. Hydrogen is a carbon-free clean fuel with a high specific energy of combustion. Titanium oxide (TiO2), graphitic-carbon nitride (g-C3N4) and cadmium sulfide (CdS) are three pillars of water splitting photocatalysts owing to their superior electronic and optical properties. Tremendous research efforts have been made in recent years to fabricate visible or solar-light, active photocatalysts. The significant features of various oxide, sulfide, and carbon based photocatalysts for cost-effective hydrogen production are presented in this Special Issue. The insights of sacrificial agents on the hydrogen production efficiency of catalysts are also presented in this issue.

photocatalysis --- H2 generation --- water splitting --- solar energy --- hydrogen production --- methanol photo-splitting --- heterojunction --- CuS@CuGaS2 --- electron-hole recombination --- perovskite oxynitride --- band gap --- density-functional theory --- Niobium(V) oxide --- graphitic carbon nitride --- hydrothermal synthesis --- H2 evolution --- heterostructures --- Z-Scheme --- TiO2 --- g-C3N4 --- CdS --- energy --- spherical particle --- disordered surface --- photocatalysts --- MoS2 --- MoSe2 --- photoelectrochemical deposition --- rapid-thermal annealing --- hydrogen evolution --- CO2 reduction --- n/a

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Water pollution from biorefractory pollutants and emerging contaminants is still a very relevant problem worldwide. Examples of these pollutants include disinfection by-products, pharmaceutical and personal care products, persistent organic chemicals, as well as their degradation products. The occurrence of these contaminants in water has raised increasing concern due to their accumulation and persistence in the environment and the threat they pose to the ecological system and human health. In this Special Issue, papers regarding the advancements in materials and processes for use in the electro- and photoelectrochemical removal of different pollutants from water are collected. The synthesis, characterization and application of materials for use in electrochemical or photoelectrochemical techniques are presented, as well as studies concerning catalytic processes and reaction kinetics.

Technology: general issues --- Chemical engineering --- Au-TiO2 --- antibiotics --- emergent contaminants --- nanocatalyst --- photocatalysis --- GFN-xTB --- ibuprofen --- advanced oxidation process --- TiO2 --- active glass --- heterojunction --- charge separation --- chlorpyrifos --- photodegradation --- nanoparticles --- gold --- cyclodextrins --- perfluorooctanoic acid --- emerging contaminant --- defluorination --- platinum --- electro-oxidation --- strontium carbonate (SrCO3) --- solvothermal method --- visible light --- n/a --- diethyl phthalate --- photoelectrochemical degradation --- persistent organic pollutants --- chloride ions --- TiO2 nanotubes --- g-C3N4 --- response surface methodology --- wastewater treatment --- phenol --- crude oil --- sonolysis --- sonophotocatalysis --- FT-ICR/MS --- Kendrick plot --- van Krevelen diagram --- water --- pollution --- remediation

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Water pollution from biorefractory pollutants and emerging contaminants is still a very relevant problem worldwide. Examples of these pollutants include disinfection by-products, pharmaceutical and personal care products, persistent organic chemicals, as well as their degradation products. The occurrence of these contaminants in water has raised increasing concern due to their accumulation and persistence in the environment and the threat they pose to the ecological system and human health. In this Special Issue, papers regarding the advancements in materials and processes for use in the electro- and photoelectrochemical removal of different pollutants from water are collected. The synthesis, characterization and application of materials for use in electrochemical or photoelectrochemical techniques are presented, as well as studies concerning catalytic processes and reaction kinetics.

Technology: general issues --- Chemical engineering --- Au-TiO2 --- antibiotics --- emergent contaminants --- nanocatalyst --- photocatalysis --- GFN-xTB --- ibuprofen --- advanced oxidation process --- TiO2 --- active glass --- heterojunction --- charge separation --- chlorpyrifos --- photodegradation --- nanoparticles --- gold --- cyclodextrins --- perfluorooctanoic acid --- emerging contaminant --- defluorination --- platinum --- electro-oxidation --- strontium carbonate (SrCO3) --- solvothermal method --- visible light --- diethyl phthalate --- photoelectrochemical degradation --- persistent organic pollutants --- chloride ions --- TiO2 nanotubes --- g-C3N4 --- response surface methodology --- wastewater treatment --- phenol --- crude oil --- sonolysis --- sonophotocatalysis --- FT-ICR/MS --- Kendrick plot --- van Krevelen diagram --- water --- pollution --- remediation

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This book, entitled “Mesoporous Metal Oxide Films”, contains an editorial and a collection of ten research articles covering fundamental studies and applications of different metal oxide films. Mesoporous materials have been widely investigated and applied in many technological applications owing to their outstanding structural and physical properties. In this book, important developments in this fast-moving field are presented from various research groups around the world. Different preparation methods and applications of these novel and interesting materials have been reported, and it was demonstrated that mesoporosity has a direct impact on the properties and potential applications of such materials. The potential use of mesoporous metal oxide films and coatings with different morphology and structures is demonstrated in many technological applications, particularly chemical and electrochemical sensors, supercapacitors, solar cells, photoelectrodes, bioceramics, photonic switches, and anticorrosion agents.

History of engineering & technology --- SnO2 --- Metglas --- hemin --- H2O2 --- cyclic voltammetry --- magnetoelastic resonance --- sensor --- titanium dioxide --- mesoporous --- thin film --- multi-layered --- photoanode --- semiconductor --- photoelectrochemical water oxidation --- Mn2O3 --- mesoporous materials --- electrochemical characterizations --- electrode --- supercapacitors --- gadolinium oxide --- hydrazine --- p-nitrophenol --- electrochemical sensing --- amperometric --- selective sensor --- nanocrystal --- ZnO --- density of states --- optical and electrical properties --- TiO2 films --- Ag nanoparticles --- optical properties --- spectroelectrochemistry --- surface plasmon --- Fe-doped TiO2 --- hydrothermal --- GCE --- chemical sensor --- amperometry --- dye-sensitized solar cells --- working electrode --- TiO2 --- NiO nanoparticles --- electron transport --- corrosion --- guar gum --- coatings --- electrochemical impedance spectroscopy (EIS) --- SECM --- AFM --- calcium phosphate silicate --- PEG --- bioceramics --- sol-gel preparation --- hard tissue engineering --- metal oxide --- sol-gel --- supercapacitor --- photoelectrode --- dye sensitized solar cell --- NiO

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Visualizing chemical components in a specimen is an essential technology in many branches of science and practical applications. This book deals with electrochemical imaging techniques based on semiconductor devices with capability of spatially resolved sensing. Two types of such sensing devices have been extensively studied and applied in various fields, i.e., arrayed sensors and light-addressed sensors. An ion-sensitive field-effect transistor (ISFET) array and a charge-coupled device (CCD) ion image sensor are examples of arrayed sensors. They take advantage of semiconductor microfabrication technology to integrate a large number of sensing elements on a single chip, each representing a pixel to form a chemical image. A light-addressable potentiometric sensor (LAPS), on the other hand, has no pixel structure. A chemical image is obtained by raster-scanning the sensor plate with a light beam, which can flexibly define the position and size of a pixel. This light-addressing approach is further applied in other LAPS-inspired methods. Scanning photo-induced impedance microscopy (SPIM) realized impedance mapping and light-addressable electrodes/light-activated electrochemistry (LAE) realized local activation of Faradaic processes. This book includes eight articles on state-of-the-art technologies of light-addressing/chemical imaging devices and their application to biology and materials science.

CCD ion sensor --- multi-ion image --- CMOS technology --- ink-jet printing --- bioactive cations --- LAPS --- chemical imaging --- spatial and temporal resolution --- semiconductor --- microfluidics --- photoelectrochemistry --- InGaN/GaN epilayer --- cell imaging --- light-activated electrochemistry --- light-addressable potentiometric sensor --- chemical imaging sensor --- field-effect sensor --- light-addressable potentiometric sensor (LAPS) --- Lactobacillus brevis --- Escherichia coli --- Corynebacterium glutamicum --- cellular metabolism --- differential cell-based measurement --- multi-analyte analysis --- extracellular acidification --- DNA biosensor --- ZnO nanorod arrays --- label-free detection --- E. coli --- light-addressable electrode --- light-addressable cell stimulation and photoelectrochemistry --- photoelectrochemical deposition --- crevice corrosion --- potential distribution --- crevice gap