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The reversible elimination of hydrogen from metal hydrides serves as the basis for unique methods of energy transformation. This technology has found widespread practical utilization in applications such as hydrogen compressors, storage, and sensors, as well as batteries. Moreover, it is plausible that metal hydride technology could be utilized to provide practically viable solutions to the challenges of energy storage. For nearly two decades, an extensive, worldwide research effort has been devoted to complex metal hydrides possessing high volumetric and/or gravimetric hydrogen densities with the goal of their practical utilization as onboard hydrogen storage materials. Additionally, a significant and growing number of efforts have been devoted to developing metal hydrides as advanced sensors and ionic conductors, and for electrochemical and stationary energy storage.

metal hydride --- electrochemical --- application --- ionic conductors --- complex hydride --- energy storage --- hydrogen sensor --- hydrogen storage

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This Special Issue reprint covers the most recent advances in nanoalloy electrocatalysts, concerning not only the synthesis, characterization, and modeling, but especially reports of their activity, functionality, durability, and low cost.

oxygen reduction reaction --- molybdenum carbide --- carbon nanotubes --- carbon xerogel --- alkaline fuel cell --- bifunctional catalyst --- electroless deposition --- fuel cells --- heterogeneous catalysis --- preparation --- carbon nanotube networks --- electrocatalysis --- desorption spectrometry --- hydrogen storage --- nanometrology --- graphene --- nanotubes thread --- palladium --- trimetallic catalysts --- nanoparticle --- borohydride oxidation --- direct borohydride peroxide fuel cell --- kinetic parameters --- intermetallic XRD patterns --- alloy formation --- ethanol electrooxidation --- metal segregation --- borohydride reduction --- n/a

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Energy storage currently plays an important role in the electricity systems. Innovative energy storage solutions will play an important role in ensuring the integration of renewable energy sources into the electrical grids in the European Union. Pumped storage hydropower systems are the most mature technology of energy storage and account for over 90% of installed energy storage capacity worldwide. However, PSH technology is constrained by topography and land availability in flat areas. In addition, PSH plants are controversial due to their impacts on landscape, land use and the environment. Conversely, underground energy storage systems may be an interesting alternative to increase the energy storage capacity with low environmental impacts. To help address and resolve these types of questions, this book is comprised of eleven chapters that explore new ways of energy storage reducing the environmental impacts caused by the installation of conventional energy storage systems, as well as to increase the energy storage capacity and promote the use of disused underground space, such as abandoned mines and quarries. The chapters included in this book cover a wide spectrum of issues related to underground energy storage systems. Advances in underground pumped storage hydropower, compressed air energy storage and hydrogen energy storage systems are presented. Finally, we would like to thank both the MDPI publishing and editorial staff for their excellent work and support, as well as the authors who collaborated with your interesting research works.

energy storage --- underground pumped storage --- economic feasibility --- ancillary services --- day-ahead market --- underground space --- mining structures --- underground reservoir --- empirical analysis --- numerical modelling --- hydropower plants --- hydrogen --- underground storage --- leakage --- monitoring --- protocol --- helium --- aquifer --- renewable energy --- hydropower --- mine --- groundwater --- environmental impacts --- efficiency --- wind energy --- photovoltaics --- wind curtailment --- mesoscale atmospheric model --- hydro-pumped storage --- abandoned mines --- underground reservoirs --- CAES --- analytical modelling --- sealing layer --- environmental impact --- hydrogen storage --- sealing liners --- Liner Rock Caverns --- epoxy resin --- hydrogen permeability --- exergy --- salt caverns --- pumped storage hydropower --- energy storage system --- quarry --- open pit --- hydrochemistry --- n/a

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Energy and the environment are irrevocably interrelated, and they are critical factors that influence the development of societies. The pollution of the environment without considering various consequences has become one of the most important global issues today. This environmental pollution is mainly the result of increases in economic activities, population, transportation, electricity generation, agriculture, forestry, and land use. The exigency of energy for these activities, the rapidly rising price of petroleum oil, the harmful effect of greenhouse gases, and the quest for energy security have steered our attention towards sustainable sources of energy. It is fundamental to find innovative solutions that are sustainable from the perspective of energy management and environmental protection. This book includes three review articles which review the state-of-the-art of different sustainable energy resources. These articles include ammonia as a renewable energy carrier, integration of solar photovoltaic, and bio-oil from waste tires for automotive engine application. In addition, eight research studies reveal new knowledge about energy for a sustainable future. The topics covered span many diverse areas associated with sustainable energy, including various biofuels, photovoltaic, and other aspects of sustainability. These complementary contributions provide a substantial body of knowledge in the field of Renewable and Sustainable Energy.

heterogeneous catalyst --- hydrodeoxygenation (HDO) --- zinc --- phenol --- bio-oil --- technical --- economic --- institutional --- policy --- pumped hydro storage --- geothermal heat exchangers --- combined arrangement --- operation analysis --- solar home systems --- rural households --- energy transitions --- energy access --- bio-jet fuel --- microwave-assisted transesterification --- RSM --- ANN --- optimization --- coconut oil --- scenario analysis --- scenario generation --- weather influence --- coal decommissioning --- high PV penetration --- energy balance --- CO2 reduction --- urban air quality --- PM2.5 --- PM10 --- particle emission sources --- focus group discussion --- sustainability --- renewable energy development --- Indonesia --- geothermal --- maintenance strategy --- sustainable maintenance --- ABCD procedure --- strategic sustainable development --- transformer failures --- ammonia --- renewable energy storage --- hydrogen storage --- waste tyre --- waste management --- pyrolysis --- automobile engine --- n/a

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The coastal zone is the host to many human activities, which have significantly increased in the last decades. However, sea level rise and more frequent storm events severely affect beaches and coastal structures, with negative consequences and dramatic impacts on coastal communities. These aspects add to typical coastal problems, like flooding and beach erosion, which already leading to large economic losses and human fatalities. Modeling is thus fundamental for an exhaustive understanding of the nearshore region in the present and future environment. Innovative tools and technologies may help to better understand coastal processes in terms of hydrodynamics, sediment transport, bed morphology, and their interaction with coastal structures. This book collects several contributions focusing on nearshore dynamics, and span among several time and spatial scales using both physical and numerical approaches. The aim is to describe the most recent advances in coastal dynamics.

bending failure --- wind energy --- switching overvoltage --- marine energy --- floating offshore wind turbine (FOWT) --- hydrogen storage --- different loading directions --- armour --- vacuum circuit breaker --- HVAC --- CAES --- electrical connection --- reignition characteristics --- combined static and dynamic loads --- gravity-based structures --- ocean energy --- onshore-offshore wind power plant --- ERA5 --- development --- foundations --- weight --- jacket --- monopile --- monitoring --- frequency response functions --- renewable energies --- HVDC --- offshore wind farm --- size --- support structure --- free vortex wake --- P2X --- operation and maintenance --- horizontal vibration --- scour phenomenon --- load mitigation --- model testing --- support structures --- GBF --- safety factor --- design response spectrum --- nominal diameter --- wave --- aiRthermo --- broken mooring line --- tripod --- tension leg platforms --- mooring system --- wind power density --- physical models --- wind resource --- floating --- design and construction --- GBS --- ocean thermal --- air density --- loads and response --- coupled dynamic response --- tidal --- offshore wind energy --- offshore wind turbine --- optimal selection factors --- Lebanon --- trailing-edge flap --- ice force --- offshore wind --- wind turbine generators --- numerical models --- crushing failure --- marine currents