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Selected Papers from HEREM: The International Symposium on Hydrogen Energy, Renewable Energy and Materials

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A5: Hydrogen Energy".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 12611

Special Issue Editor

Prof. Dr. Mohan Lal Kolhe

E-Mail Website
Guest Editor
Faculty of Engineering and Science, University of Agder, P.O. Box 422, 4604 Kristiansand, Norway
Interests: clean energy technologies; renewable energy systems; electrical energy engineering; energy efficiency; energy economics; techno-economic operation of energy systems; renewable energy technologies integration; smart grids; micro grids; electric vehicles; energy storage
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The HEREM conference (International Symposium on Hydrogen Energy, Renewable Energy and Materials) will be one of the most recognizable conferences in hydrogen energy systems and renewable energy technologies. From the very beginning, HEREM has been a unique occasion for disseminating and sharing the advancements in hydrogen energy, renewable energy, and energy materials technologies. The integrated hydrogen energy systems are progressing exponentially, and hence the HEREM will focus on providing an excellent platform to the energy technologists, scientists, industrialists, environmentalists, energy policymakers, and experts to highlight their novel hydrogen energy technologies with the integration of renewable energy systems. The goal of the HEREM is to address hydrogen energy- and renewable energy-related key technical challenges, opportunities, new technical innovations along with energy policies for the promotion of hydrogen, and renewable energy technologies for achieving the United Nations’ Sustainable Development Goals in an integrated manner. The HEREM is going to provide networking opportunities for global collaborations for creating sustainable solutions for diverse applications of hydrogen and renewable energy technologies. The scientific program of HEREM will include expert speeches from the world-leading scientists, state-of-the-art keynote speeches, interactive clean energy education sessions, breakout-focused research sessions, and oral presentation sessions for peer-reviewed abstracts. We sincerely hope that the blend of pleasant weather, warm hospitality, and revitalizing social evenings will make the scientific environment at HEREM richer. The selected peer-reviewed articles will be recommended for publication in a Special Issue of the journal Energies (ISSN 1996-1073), which is indexed in well-established databases/archives (SCI, Scopus, etc.).

In this Special Issue of HEREM, we seek groundbreaking research and case studies that demonstrate applications and advancements in hydrogen and renewable energy technologies along with advancements in energy materials systems. Topics of interest for publication include, but are not limited to the following:

  • Hydrogen energy technologies and systems
  • Electro-chemical-mechanical energy conversion systems
  • Renewable energy technologies
  • Electrical and mechanical energy systems
  • Energy efficiency and management
  • Energy materials
  • Chemical energy processes
  • Hydrogen economy
  • Energy policy

Interested contributors are requested to visit herem.org for further information.

Prof. Dr. Mohan Lal Kolhe
Guest Editor

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Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

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Published Papers (4 papers)

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Research

9 pages, 3072 KiB  
Communication
How Acid Washing Nickel Foam Substrates Improves the Efficiency of the Alkaline Hydrogen Evolution Reaction
by Thomas B. Ferriday, Suhas Nuggehalli Sampathkumar, Peter Hugh Middleton, Jan Van Herle and Mohan Lal Kolhe
Energies 2023, 16(5), 2083; https://doi.org/10.3390/en16052083 - 21 Feb 2023
Cited by 5 | Viewed by 3288
Abstract
Nickel foam substrates are frequently utilised as porous 3D substrates for renewable energy applications. The preparation of these substrates usually includes an acid-washing step, but the degree to which this step affects the final electrochemical performance after spray-coating a catalyst ink is unreported. [...] Read more.
Nickel foam substrates are frequently utilised as porous 3D substrates for renewable energy applications. The preparation of these substrates usually includes an acid-washing step, but the degree to which this step affects the final electrochemical performance after spray-coating a catalyst ink is unreported. Herein, we report the effects of acid washing through physicochemical and electrochemical characterisation. The electrochemical performance was determined through repeated measurements of catalyst-coated nickel foam substrates both with and without the initial step of acid washing. It was found that acid washing increased the current density by 17.9% for the acid-treated MoS2-coated nickel foam electrode. This increment was affiliated with an electrochemically active surface area that increased by 11.2%, and a Tafel analysis indicated that the acid-treated MoS2-coated electrodes facilitated the initial water dissociation step of the hydrogen evolution reaction with greater ease. Similar effects were also discovered for acid-treated PtIr(1:3)/C-coated nickel foam substrates. The stability was also improved; the degradation rate was reduced by 18.9% for the acid-treated MoS2-coated electrodes. This demonstrates the utility of acid washing nickel foam electrodes. Full article
(This article belongs to the Special Issue Selected Papers from HEREM: The International Symposium on Hydrogen Energy, Renewable Energy and Materials)
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8 pages, 1829 KiB  
Article
Stability of Cs/Ru/MgO Catalyst for Ammonia Synthesis as a Hydrogen and Energy Carrier
by Rahat Javaid and Tetsuya Nanba
Energies 2022, 15(10), 3506; https://doi.org/10.3390/en15103506 - 11 May 2022
Cited by 11 | Viewed by 2703
Abstract
The Cs/Ru/MgO catalyst was synthesized by sequential impregnation of Ru and Cs on MgO support using Ru(NO3)3 and CsNO3 precursors. Catalytic ammonia synthesis was carried out in a fixed-bed flow reactor using H2 and N2 as reactants. [...] Read more.
The Cs/Ru/MgO catalyst was synthesized by sequential impregnation of Ru and Cs on MgO support using Ru(NO3)3 and CsNO3 precursors. Catalytic ammonia synthesis was carried out in a fixed-bed flow reactor using H2 and N2 as reactants. The stability of the catalyst was measured at 350 °C, 2.5 MPa gauge pressure, and SV as 1200 h−1 using the H2/N2 ratio 3 as a reactant feedstock. The Cs/Ru/MgO catalyst retained its ammonia synthesis activity while conducting experiments at mild reaction conditions of 325 °C and 350 °C. An increase in experimental temperature to 375–425 °C decreased the ammonia synthesis activity retaining only to 42% of the initial activity after 680 h of time on stream. The deformation of the catalyst’s structure, which was caused by Cs leaching and redistribution of the Ru and increased crystallinity of MgO at high-temperature conditions, was considered the plausible reason for the drastic decrease in ammonia synthesis activity. Full article
(This article belongs to the Special Issue Selected Papers from HEREM: The International Symposium on Hydrogen Energy, Renewable Energy and Materials)
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10 pages, 20506 KiB  
Article
Thermal Safety Analysis of On-Site Emulsion Explosives Mixed with Waste Engine Oil
by Weibo Sun, Xuefeng Gao, Yan Wang and Yanjun Tong
Energies 2022, 15(3), 895; https://doi.org/10.3390/en15030895 - 26 Jan 2022
Cited by 4 | Viewed by 2765
Abstract
The study of the thermal safety of emulsion explosives mixed with waste engine oil is very important for the safety of these types of explosives used in mine blasting. In order to study the thermal safety of emulsion explosives mixed with waste engine [...] Read more.
The study of the thermal safety of emulsion explosives mixed with waste engine oil is very important for the safety of these types of explosives used in mine blasting. In order to study the thermal safety of emulsion explosives mixed with waste engine oil, thermal safety tests were carried out using a Differential Scanning Calorimeter (DSC), non-isothermal kinetics, and the Flynn–Wall–Ozawa method. The results show that the minor particle impurities in the filtered waste engine oil are mainly combustibles; after adding different amounts of waste engine oil, the activation energy of the emulsion matrix decreases from 110.33 kJ/mol to 75.39 kJ/mol, 74.50 kJ/mol, and 82.23 kJ/mol, and the critical temperature for thermal explosion changes from 194.16 °C to 169.73 °C, 227.47 °C, and 208.78 °C. The addition of waste engine oil reduces the activation energy of emulsion explosives. The waste engine oil is negatively correlated with the activation energy and the thermal explosion reaction temperature of emulsion explosives, and the correlation coefficient is −0.686 and −0.333. The emulsifier is positively correlated with the critical temperature of thermal explosion of emulsion explosives, and the correlation coefficient is 0.251. The small particles in the waste engine oil create a hot spot in the emulsion explosives, which reduces the thermal safety of the emulsion explosives mixed with waste engine oil. The emulsifier reduces the droplet size of the emulsion explosive, improves the oil-water interface strength, and improves the thermal safety of the emulsion explosives mixed with waste engine oil. The thermal safety of emulsion explosives mixed with waste engine oil can be improved by reducing the proportion of the sensitizer and increasing the proportion of the emulsifier. Full article
(This article belongs to the Special Issue Selected Papers from HEREM: The International Symposium on Hydrogen Energy, Renewable Energy and Materials)
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37 pages, 42432 KiB  
Article
Investigation into Yaw Motion Influence of Horizontal-Axis Wind Turbine on Wake Flow Using LBM-LES
by Weimin Wu, Xiongfei Liu, Jingcheng Liu, Shunpeng Zeng, Chuande Zhou and Xiaomei Wang
Energies 2021, 14(17), 5248; https://doi.org/10.3390/en14175248 - 24 Aug 2021
Cited by 7 | Viewed by 2547
Abstract
The dynamic yaw motion of the wind turbine will affect the overall aerodynamic performance of the impeller and the corresponding wake flow, but the current research on this issue is inadequate. Thus, it is very necessary to study the complicated near-wake aerodynamic behaviors [...] Read more.
The dynamic yaw motion of the wind turbine will affect the overall aerodynamic performance of the impeller and the corresponding wake flow, but the current research on this issue is inadequate. Thus, it is very necessary to study the complicated near-wake aerodynamic behaviors during the yaw process and the closely related blade aerodynamic characteristics. This work utilized the multi-relaxation time lattice Boltzmann (MRT-LBM) model to investigate the integral aerodynamic performance characteristics of the specified impeller and the dynamic changes in the near wake under a sine yawing process, in which the normalized result is adopted to facilitate data comparison and understanding. Moreover, considering the complexity of the wake flows, the large eddy simulation (LES) and wall-adapting local eddy-viscosity (WALE) model are also used in this investigation. The related results indicate that the degree of stability of tip spiral wake in the dynamic yaw condition is inversely related to the absolute value of the change rate of yaw angular speed. When the wind turbine returns to the position with the yaw angle of 0 (deg) around, the linearized migration of tip vortex is changed, and the speed loss in the wake center is reduced at about the normalized velocity of 0.27, and another transverse expansion appeared. The directional inducing downstream of the impeller sweep surface for tip vortex is clearly reflected on the entering side and the exiting side. Additionally, the features of the static pressure on the blade surface and the overall aerodynamic effects of the impeller are also discussed, respectively. Full article
(This article belongs to the Special Issue Selected Papers from HEREM: The International Symposium on Hydrogen Energy, Renewable Energy and Materials)
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