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With the increasing demand for electricity, more and more fossil fuels are used to generate electricity which leads to energy shortage and environmental pollution. Therefore, using Renewable Energy Sources (RESs) and developing sustainable smart grid have become a common global priority: Since RESs, like solar and wind energy, are inherently unstable, hydrogen energy, as a completely clean new energy, has received widespread attention: I-Energy, which combines information and energy, is a new research direction in smart grid. Furthermore, the household electricity usage accounts for 41% of the total power consumption. Therefore, Household Intelligent Electricity System (HIES), combining hydrogen energy and i-Energy, becomes smart solutions. In this paper, we review the scientific literature for hydrogen energy and i-Energy on HIES, including recognition of electricity appliances, establishment of power consumption model, human activity analysis, smart interactive terminal, home energy management system, distributed power supply and district coordinated power utilization. Finally, we summarize the challenges and give the solutions concerning HIES, and this work can give a useful reference to new energy used model and environment protection. • A new application of Hydrogen Energy on Household Intelligent Electricity System (HIES). • A comprehensive overview of Hydrogen Energy and I-energy on HIES. • Combining internet with traditional electricity to analyses I-energy on HIES. • Summarizing the challenges and corresponding solutions concerning HIES. [ABSTRACT FROM AUTHOR]

The current editorial summarized some of the scientific works presented in the Sustainable Energy and Environmental Protection (SEEP) conference-held at the University of the West of Scotland, UK, 2018. The selected work was directly related to the scope of the Renewable, Sustainable Energy Reviews (RSER) journal. During the conference activities, experts from all around the world in the subjects of: renewable energy, climate change, optimization, and economics presented and discussed the progress made in renewable energy sources, as well as the new strategies for protecting the environment from the hazards connected with fossil fuel utilization. The methods presented in the conference focused on several directions: the development of efficient energy conversion systems with low/no environmental impacts; the suggested policies to widespread renewable energies; the restriction in the emission of greenhouse gases, and the recent progresses in CO 2 capture. This editorial focused on the renewable energy developments and their positive effect on the climate change, and briefly summarized the accepted manuscripts in this issue. • Effects of renewable energy on climate change. • Background on the International Conference on Sustainable Energy and Environmental Protection SEEP. • Summary of selected papers of SEEP 2018. [ABSTRACT FROM AUTHOR]

The current editorial summarized some of the scientific works presented in the Sustainable Energy and Environmental Protection (SEEP) conference-held at the University of the West of Scotland, UK, 2018. The selected work was directly related to the scope of the Renewable, Sustainable Energy Reviews (RSER) journal. During the conference activities, experts from all around the world in the subjects of: renewable energy, climate change, optimization, and economics presented and discussed the progress made in renewable energy sources, as well as the new strategies for protecting the environment from the hazards connected with fossil fuel utilization. The methods presented in the conference focused on several directions: the development of efficient energy conversion systems with low/no environmental impacts; the suggested policies to widespread renewable energies; the restriction in the emission of greenhouse gases, and the recent progresses in CO 2 capture. This editorial focused on the renewable energy developments and their positive effect on the climate change, and briefly summarized the accepted manuscripts in this issue. • Effects of renewable energy on climate change. • Background on the International Conference on Sustainable Energy and Environmental Protection SEEP. • Summary of selected papers of SEEP 2018. [ABSTRACT FROM AUTHOR]

A global goal is to call for common solutions to the challenge of environmental conservation. The cheap, clean and green energy and processes help to beat the hazardous pollution of plastics. An action of the STEP (Solar Thermal Electrochemical Process) on the polymer is to create a novel vision of the depolymerization of plastics to generate valuable fuels plus abundant hydrogen. In this paper, a solar thermo-coupled electrochemical system was first designed and employed to realize the plastics depolymerization to useful fuels for enhanced the solar utilization and the chemical polymer conversion. Exemplified by polypropylene (PP), the plastics were efficiently converted to light fuel and hydrogen via the solar-driven electrolysis coupled with pyrolysis. The results demonstrated that the depolymerization temperature was greatly lowered compared to conventional pyrolysis. The STEP conversion rates increased with a lift of the temperature and current. The high total conversion rate was significantly achieved by reaching 68.48% at 350 °C, including the solid phase of 31.52%, the liquid phase of 7.85% and the gas phase of 60.63% (w/w), which was compared to the 28.39% of the sole pyrolysis. The hydrogen was evolved during the process in the final volume of 72.5 ml, which was about 9.3 times more than that of the pyrolysis at 400 °C. In the outdoor experiments, the total conversion reached 66.64% at 350 °C, which was compared to 26.37% of the pyrolysis only. The light hydrocarbons were richly produced in the distribution of C 1 –C 5 hydrocarbons while only tiny amounts of methane and ethane were probed in the pyrolysis. The common mechanism and pathways can be tentatively proposed in a mode of the radically initiated thermochemical reactions and electrochemical redox by the induction of the solar thermo-coupled electrolysis. • The STEP plastics depolymerization was firstly created and studied. • The depolymerization was driven by the solar thermochemical-coupled electrochemical processes. • The STEP plastics depolymerization largely reduced the reaction temperature. • The STEP conversion rates were more significantly improved compared to the one of the pyrolysis. • The STEP depolymerization efficiently yields abundant hydrogen and light hydrocarbons. [ABSTRACT FROM AUTHOR]