Temperature is one of the main factors affecting the performance of proton-exchange membrane fuel cell (PEMFC). To make the temperature of the cell more uniform and prevent the occurrence of local hot spots, two novel types of coolant channels (novel A and novel B) are designed and compared with the traditional serpentine channel. Through computational fluid dynamics simulations, the flow field and

This article discusses possible strategies for decarbonizing the energy systems of an existing port. The approach consists in creating a complete superstructure that includes the use of renewable and fossil energy sources, the import or local production of hydrogen, vehicles and other equipment powered by Diesel, electricity or hydrogen and the associated refuelling and storage units. Two substructures

This study revealed the relationship between V8C7 size and hydrogen diffusion behavior as well as hydrogen induced cracking (HIC) in pipeline steel. Hydrogen permeation and HIC susceptibility tests were implemented on five conditions with different V8C7 sizes but identical volume fractions. The results proved that with increasing of V8C7 size, the hydrogen effective diffusivity was first decreased

Biological dihydrogen (H2) production is a promising alternative to the conventional non-renewable energies. H2 production by dark fermentation is particularly studied regarding its independence from fossil fuel and electricity, its cultivation into bioreactors and the broad range of substrate that can be used. A major goal application of dark fermentation is the valuation of wastes. In this context

Na2Ti3O7, a titanium-based compound for sodium ion batteries (SIBs), stands out among anode materials because of its ultralow voltage plateau which leads to advanced energy density. However, the poor electronic conductivity and mediocre sodium ion storage capability are the main bottlenecks for its large-scale development. In this regard, self-supported Se doped Na2Ti3O7 arrays are innovatively proposed

The global trend towards decarbonization and the demand for energy security have put hydrogen energy into the spotlight of industry, politics, and societies. Numerous governments worldwide are adopting policies and strategies to facilitate the transition towards hydrogen-based economies. To assess the determinants of such transition, this study presents a comparative analysis of the technological innovation

Catalysis is an integral part of numerous chemical industries. Noble metals like platinum (Pt) are known for having high catalytic activity and stability for various catalytic reactions such as methane reforming, water gas shift reaction, electrocatalytic reactions etc. However, due to the limited resources and high cost of platinum, the catalysts with low Pt content are desirable. To overcome this

The objective of this paper is to evaluate and assess the potential of green hydrogen (H2) as a substitute fuel for Cameroon's road transportation system. To achieve this objective, we start by providing a status quo of Cameroon's road transport. Then, we conduct an empirical analysis on the potential of H2 as a fuel for vehicles. Based on photovoltaic electrolysis, we estimate the amount of H2 needed

This study investigated the impact of cushion gas type and presence on the performance of underground hydrogen storage (UHS) in an offshore North Sea aquifer. Using numerical simulation, the relationship between cushion gas type and UHS performance was comprehensively evaluated, providing valuable insights for designing an efficient UHS project delivery. Results indicated that cushion gas type can

Integrating 2D carbon nitride (CN) photocatalyst with 2D graphene into a lateral heterojunction can decrease energy loss within interlayer space, which is an intriguing strategy for tailoring photocatalyst for energy and environmental applications. Herein, a polyethyleneimine (PEI) induced in-situ chemical epitaxial growth strategy was adopted to tailor graphene-oxide CN (GO-CN) intralayer heterostructure

This study investigates the effectiveness of the hydrogen-enrichment strategy on a Wankel engine for unmanned aerial vehicles (UAVs). The primary motivation behind this study is to contribute to the Wankel-type rotary engine designs by revealing the influences of the hydrogen enrichment method on the Wankel engine performance at various altitudes. To achieve these objectives, CFD simulations were conducted

The transition from fossil fuels to renewable energy sources is seen as an essential step toward a more sustainable future. Hydrogen is being recognized as a promising renewable energy carrier to address the intermittency issues associated with renewable energy sources. For hydrogen to become the “ideal” low or zero-carbon energy carrier, its storage and transportation shortcomings must be addressed

The aim of this work is to evaluate if metal hydride hydrogen storage tanks are a competitive alternative for onboard hydrogen storage in the maritime sector, when compared to compressed gas and liquid hydrogen storage. This is done by modelling different hydrogen supply and onboard storage scenarios and evaluating their levelized cost of hydrogen variables. The levelized cost of hydrogen for each

Alkaline water electrolysis has become the most promising solution for hydrogen production considering certain factors such as cost, lifetime and maturity of technology. By developing the large-scale hydrogen production by alkaline water electrolysis as the energy buffering, the consuming pressure of the power system caused by the growing penetration of renewable energy sources such as wind and solar

Green hydrogen production via alkaline water electrolysis has the capability to greatly reduce emissions of greenhouse gases and support the transition to a cleaner, more sustainable energy system. The use of modeling in the development and optimization of alkaline water electrolysis (AWE) systems can help in enhancing the performance of the electrolysis process, ultimately enabling the green hydrogen

Renewable hydrogen is emerging as a valid energy alternative to the fossil fuels currently in use. Governments are developing hydrogen-based energy strategies as a tool to decarbonise the transport, industrial, energy, and residential sectors. It is estimated that by 2050, hydrogen could cover 34% of the energy demand in these sectors in Europe according to the European Commission. However, for this

A hydrogen fuel cell based hybrid energy system is designed and analyzed to be used in conventional submarines for propulsion and power management. This system is proposed as an alternative to the diesel-electric system. This system eliminates the need for the submarine to surface and hence can continuously operate while submerged underwater. This hybrid system produces electricity, heat, and purified

Efficient methods and materials to store hydrogen onboard in light-duty fuel cell vehicles is crucial to move away from fossil fuels in the transport sector. Metal-decorated carbon materials are considered as promising materials for hydrogen storage. In this regard, using density functional theory (DFT) simulations incorporating the generalized gradient approximation functional along with the DFT-D2

Co-generation of hydrogen with value-added by-products is a promising route for affordable low-carbon hydrogen. This work presents a system for and a technoeconomic analysis of hydrogen with the co-generation of chlorine and sodium hydroxide from waste brine. The system uses a conceptual triple-junction gallium arsenide (3-J GaAs)-based photoelectrochemical (PEC) reactor at high solar concentrations

In the current study, an onboard dry cell electrolyzer was built to produce an oxyhydrogen (HHO) flow rate of 0.5 L/min by water electrolysis. The objective is to show the impact of oxyhydrogen introduction on engine exhaust gases, combustion characteristics, and engine performance related to gasoline. The experiments were carried out in a petrol engine at a fixed engine speed of 3000 rpm and variable

Developing efficient photocatalysts for H2 production holds great promise to enhance solar energy conversion. In this study, we present a facile strategy to enhance H2 production by simultaneously engineering Pt cocatalyst and oxygen vacancies (Vo) on mesoporous N doping TiO2, thereby developing efficient photocatalysts for solar energy conversion. Firstly, we employed a structure-directing agent-assisted

In conventional PEM fuel cell systems with active hydrogen recovery, a significant drop in the output power occurs during hydrogen purging. In the present study, this problem is addressed through oxygen and hydrogen flow control strategies based on a proportional integral (PI) controller, fuzzy PI controller, and optimized fuzzy PI controller, respectively. When the optimized fuzzy PI controller is

The current systems for air independent propulsion systems are based on hydrogen stored in a limited number of cylinders for the continuous operation of the fuel cells in marine vehicles. Hydrogen generation by on-board steam reforming of methanol could extend the air-independent period. This study presents an autothermal reactor for the coupled endothermic (methanol steam reforming) and exothermic

A promising step towards a carbon-free gas diffusion electrode (CF-GDE) design for alkaline applications is shown in this work. MnOx´s are electrodeposited on nickel foam by varying the settings, and then they were annealed at 300 °C. These CF-GDEs were characterized and compared with a commercial carbon-based GDE (GDEref). Samples were analyzed by XRD, SEM, X-ray tomography, contact angle method,

The development of the global hydrogen industry as part of the new energy industry is largely constrained by low efficiency of hydrogen conversion and synthesis and the high end-to-end cash cost of the feedstock. Similar problems, as well as problems of transportation, are experienced by world trade. A new method that can increase the investment attractiveness of high-risk hydrogen production projects

The paper presents a critical analysis of a commercial pre-feasibility study for hydrogen generation from sewage sludge generated in a wastewater treatment plant sized Population Equivalent (PE) = 160,000 Three commercial offers based on hydrothermal carbonization, gasification/plasma gasification and gas separation, are analysed and validated in terms of chemical reactions and energy balance. The

Abstract not available

Getter alloy has the advantages of low cost and high hydrogen purity in small and medium-scale hydrogen purification. However, the commonly used ZrMnFe alloy is reactive to various impurities in hydrogen, and requires a temperature above 600 °C to remove methane. To improve reactivity with methane and ensure a high hydrogen adsorption platform pressure, partial substitution of Fe with Ni, which has

To prepare a kind of Al-based composite materials with high hydrogen performance, this study characterizes the influence of temperature on Al alloy's hydrogen generation performance and investigates the role of bismuth (Bi) and tin (Sn) in hydrogen generation. Hydrogen testing reveals that the hydrogen properties of Al–Sn–Bi composite materials are significantly improvs at 75 °C than they are at 50 °C

The primary issue for the commercialization of proton exchange membrane fuel cells (PEMFCs) is the carbon corrosion of support and dissolution agglomeration of platinum nanoparticles under start-up/shut-down (SU/SD) conditions. Carbon nanotubes (CNTs)-supported Pt nanowire (PtNW) catalyst toward the ORR was synthesized via the soft template method. Electrochemical characterization demonstrated that

Although N2 dilution is effective in reducing NOX emissions in hydrogen engines, it decreases thermal efficiency. Utilizing Ar with N2 as a dilution gas can improve thermal efficiency while reducing NOX emissions. However, the specific effects and mechanisms of the mixed dilution of Ar and N2 on the combustion and emission characteristics of hydrogen engines remain uncertain. This study examined the