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Theoretical Modeling and Simulation of Atomically Dispersed Metallic Materials
Published in Wei Yan, Xifei Li, Shuhui Sun, Xueliang Sun, Jiujun Zhang, Atomically Dispersed Metallic Materials for Electrochemical Energy Technologies, 2023
Wen-Jin Yin, Gilberto Teobaldi, Li-Min Liu
Water splitting to H2 product is a promising way to produce clean and renewable energy. The overall reaction consists of two half-reactions: the OER and the HER. It was found that the overall reaction rate of water splitting can be optimized by modulating the coordination environment of metal single atoms. Zhou et al.89 suggested that a lower-coordinated metal single-atom center exhibits higher HER activity, whereas a higher-coordinated metal SA center is more favorable for the OER. In addition, the N content of the defective graphene support (coordinated with the central metal SA) also affects the HER and OER activity. For early TMs, the fully N-substituted sites exhibit higher activity; while for later TMs, the partially N-substituted sites are more active.
Hybrid Energy Systems for Hydrogen Production
Published in Yatish T. Shah, Hybrid Energy Systems, 2021
Jia et al. [69] examined solar water splitting by PV-electrolysis with a solar-to-hydrogen (STH) efficiency over 30%. Hydrogen production via electrochemical water splitting is a promising approach for storing solar energy. For this technology to be economically competitive, it is critical to develop water splitting systems with high STH efficiencies. Jia et al. [69] report a PV-electrolysis system with the highest STH efficiency for any water splitting technology to date, to the best of our knowledge. The system consists of two polymer electrolyte membrane electrolyzers in series with one InGaP/GaAs/GaInNAsSb triple-junction solar cell, which produces a large-enough voltage to drive both electrolyzers with no additional energy input. The solar concentration is adjusted such that the maximum power point of the PV is well matched to the operating capacity of the electrolyzers to optimize the system efficiency. The system achieves a 48-h average STH efficiency of 30%. These results demonstrate the potential of PV-electrolysis systems for cost-effective solar energy storage.
Green Chemistry and Sustainable Nanotechnological Developments: Principles, Designs, Applications, and Efficiency
Published in Neha Kanwar Rawat, Iuliana Stoica, A. K. Haghi, Green Polymer Chemistry and Composites, 2021
Yassine Slimani, Essia Hannachi
Nowadays, there exists new utilized generation of hydrogen fuel cell vehicles having null emissions. The H2 cars run by compressing hydrogen feds within stack of fuel cells, which can generate electricity to drive the vehicles. Fuel cells could be utilized by combining them with an electric motor to power vehicles cleanly, powerfully, and quietly. Numerous efforts have been concentrated on hydrogen as potential energies and on the utilization of water-splitting technologies as renewable and clean resources to produce hydrogen by means of solar energy. Several challenges have been constructed for developing photocatalysts, which can operate not only under UV light, nevertheless also under visible light illumination to proficiently use solar energy. Some promise resources of hydrogen are thermal-biochemical, photo-biochemical, photoelectric, photothermal, electrothermal, photonic, biochemical, thermal, and electrical. Certain kinds of energies could be resulted from renewable resources and from energy recovery procedures for hydrogen production goals.36-37
Beyond superconductivity towards novel biomedical, energy, ecology, and heritage applications of MgB2
Published in Green Chemistry Letters and Reviews, 2022
Photocatalytic properties of MgB2 for water splitting were proved in ref. (18). Water splitting is unanimously recognized as environment friendly, potentially low cost and renewable energy solution in the future hydrogen economy. Authors demonstrate photogeneration under IR-VS light irradiation of the electric current from dissociated water molecules using MgB2 as a catalyst with a conversion efficiency of ∼27% at bias voltage Vbias = 0.5 V. Metal-doped (Fe, Co) MgB2 works well also as an electrocatalyst (19), being a potential candidate to replace Pt-based catalysts involved in the hydrogen evolution reaction (HER) during water splitting (Figure 5).
Synthesis of TiO2/Ga2O3@MIL-125(Ti) as a potential catalyst for photodegradation of methylene blue and oxygen evolution reaction
Published in Inorganic and Nano-Metal Chemistry, 2022
Uzma Mumtaz, Muhammad Fiaz, Muhammad Athar
Water splitting offers a solution to both challenges, in which it converts electrical energy into oxygen (O2) and hydrogen (H2), which serves as fuel and feedstock for the chemical industry. Recently, different highly active materials such as transition-metal-sulfide (TMS) based materials, ZIF-67 derived Co3S4@MoS2 and core-shell Co3S4@MoS2 heterostructure have been reported for water splitting into O2 and H2.[4–6]
CdIn2S4-based advanced composite materials: Structure, properties, and applications in environment and energy – A concise review
Published in Inorganic and Nano-Metal Chemistry, 2023
Gaurav Yadav, Md. Ahmaruzzaman
Today, the researcher’s major focus is on green energy due to the rapid decrease in fossil fuels and environmental-related problem caused by the fossil fuels. Hydrogen is a green renewable source of energy. So, the generation of hydrogen by water splitting is a promising solution for energy and the environment.[81–85] Therefore, various semiconductor materials are developed for hydrogen production, but ternary metal chalcogenides like CIS are found to be better photocatalysts.