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One of the main barriers to the adoption of fuel cell vehicles (FCEVs) is the limited availability of hydrogen refuelling stations (HRSs). The presence of these stations is crucial in facilitating the provision of fuel for FCEVs, which rely on hydrogen as a source of power generation. Renewable energy sources offer significant advantages for hydrogen production at these stations, as they are environmentally friendly and can reduce costs. In this study, it is provided a techno-economic analysis of an on-site hydrogen refuelling station powered by a hybrid renewable energy generation system using HOMER software in Niğde, Türkiye, and Zaragoza, Spain. Three different power system scenarios were evaluated to refuel 24 vehicles per day for each region throughout the year. The results of the analysis showed that the most optimal system architecture for Niğde was with a solar panel power generation system, with a levelized cost of hydrogen (LCOH) of 6.15 $/kg and the net present cost (NPC) of $6,832,393. The most optimal system architecture for Zaragoza was a wind turbine-photovoltaic panel power generation system, with an LCOH of 5.83 $/kg and NPC of $6,499,723. The annual amount of CO 2 emissions avoided by using renewable resources in hydrogen production was calculated as 2,673,453 kg for Niğde and 2,366,573 kg for Zaragoza. The study also found that the cost of hydrogen production increases with decreasing the HRS production capacity. The use of renewable energy generation systems for hydrogen production will enable countries to achieve net-zero emission targets and reduce the need to import fossil fuels to meet energy demands in the transportation sector. The present study makes several contributions towards the achievement of the United Nations Sustainable Development Goals (3, 7, 11, and 13) and has the potential to facilitate the rapid adoption of FCEVs. • An on-site production hydrogen station is proposed for fuel cell vehicles. • Hydrogen production cost is chosen as the optimization objective. • Levelized Cost of Hydrogen is estimated from 5.84 to 10.87 $/kg. • The factors affecting HRS costs are investigated using sensitivity analysis. • Hydrogen production on-site integrated with renewable power systems is economically viable. [ABSTRACT FROM AUTHOR]

Hydrogen is one of the main candidates in replacing fossil fuels in the forthcoming years. However, hydrogen technologies must deal with safety aspects due to the specific substance properties. This study aims to provide an overview on the loss of integrity (LOI) of hydrogen equipment, which may lead to serious consequences, such as fires and explosions. Substantial information regarding the hydrogen lifecycle, its properties, and safety related aspects has gathered. Furthermore, focus has placed on the phenomena responsible for the LOI (e.g. hydrogen embrittlement) and material selection for hydrogen services. Moreover, a systematic review on the hydrogen LOI topic has conducted to identify and connect the most relevant and active research group within the topic. In conclusion, a significant dearth of knowledge in material behaviour of hydrogen technologies has highlighted. It is thought that is possible to bridge this gap by strengthening the collaborations between scientists from different research fields. • A systematic review on loss of integrity of hydrogen technologies was conducted. • Loss of integrity phenomena are responsible for several hydrogen accident scenarios. • Material selection may avoid the loss of integrity phenomena formation. • Material science and hydrogen safety are often two separated research fields. • Recent hydrogen accidents demonstrate the need for safety enhancement. [ABSTRACT FROM AUTHOR]

Hydrogen could gradually replace fossil fuels, mitigating the human impact on the environment. However, equipment exposed to hydrogen is subjected to damaging effects due to H 2 absorption and permeation through metals. Hence, inspection activities are necessary to preserve the physical integrity of the containment systems, and the risk-based (RBI) methodology is considered the most beneficial approach. This review aims to provide relevant information regarding hydrogen embrittlement, its effect on materials' properties, and the synergistic interplay of the factors influencing its occurrence. Moreover, an overview of predictive maintenance strategies is presented, focusing on the RBI methodology. A systematic review was carried out to identify examples of the application of RBI to equipment exposed to hydrogenated environments and to identify the most active research groups. In conclusion, a significant lack of knowledge has been highlighted, along with difficulties in applying the RBI methodology for equipment operating in a pure hydrogen environment. • The occurrence of hydrogen-induced material failures requires safety enhancements. • Hydrogen embrittlement relies on a synergistic interplay of several factors. • Tailored inspection activities could aid to monitor equipment exposed to hydrogen. • RBI approaches are not used for planning inspections of hydrogen technologies. • Material science and safety are often considered two separated research fields. [ABSTRACT FROM AUTHOR]