Energy Technology

doi: 10.1002/ente.202470011pmid: N/A

Zhu, Jiangfeng; Cao, Yuguang; Liu, Yuanyuan

doi: 10.1002/ente.202300621pmid: N/A

The new lattice floating wind turbine integrated system (also known as dot matrix floating wind turbine, and hereinafter referred to as DMF) is proposed as a new concept. More far reaching, it has obvious advantages over the traditional floating wind turbine scheme in terms of structural cost and motion stability, which provides a new idea for the development of offshore wind power energy. First, the structural parameters and mechanical model of DMF are analyzed to determine the feasibility and superiority of the overall scheme of the new lattice foundation. It is concluded that the stability of DMF in pitching motion is 70% higher than that of the traditional OC4 system. In order to further verify the feasibility of the DMF system and the accuracy of the theoretical model, based on the similarity theory, the research carried out the small‐scale prototype processing of DMF and the simulation experiment of wind wave flume. The test results are in good agreement with the simulation data. This study provides a reference and theoretical basis for the research and development of offshore multi wind turbine combined equipment and hydrodynamic stability optimization. It has certain theoretical guiding significance and economic development value.

Klick, Sebastian; Stahl, Gereon; Sauer, Dirk Uwe

doi: 10.1002/ente.202300566pmid: N/A

Lithium‐ion cells with graphite anodes and nickel–manganese–cobalt oxide (NMC622) cathodes are filled with three different amounts of electrolyte. During formation, incremental capacity analysis indicates small differences in the formation processes between cells with insufficient electrolytes to fill all pores and those with an electrolyte volume above the total pore volume of the cell. Complimentary analysis of the gases developed during formation shows that the composition of these cells differs from the cells with a sufficient electrolyte. The aging of cells under high temperature (60 °C) and high constant voltage of 4.2 V is studied. During aging, cells with higher amounts of electrolyte degrade substantially slower. Based on data available from electrical tests, a theory explaining the volume‐dependent rise of resistance and capacity decay is proposed.

Yang, Xuelan; Lin, Xinyou; Huang, Qiang; Zheng, Qingxiang; Wu, Hao

doi: 10.1002/ente.202300909pmid: N/A

Considering the trade‐off on the improvement of fuel economy performance and mode transition comfort for multimode hybrid electric vehicles (MMHEV), a bi‐objective trade‐off control strategy is designed based on the equivalent consumption minimization strategy (ECMS) with Pareto method. Aiming at the problem of optimal economy of multimode working area of vehicles, the equivalent fuel consumption cost and torque distribution MAP in different modes are determined based on ECMS. In order to solve the problem of torque instability caused by engine response lag and demand torque fluctuation, the motor torque optimization coefficient (MTOC) is introduced as the control variable by taking advantage of the motor's fast and accurate response to torque, and the genetic algorithm is used to optimize the MTOC, and a smoother torque distribution is obtained. Because there is a coupling relationship between the economy and ride comfort of the system, the trade‐off optimization is carried out using the NSGA‐II algorithm based on Pareto principle. The simulation verification conducted in nonslope and slope conditions, as well as hardware‐in‐the‐loop experiments, demonstrates the effectiveness of the proposed control strategy in managing the trade‐off between economy and ride comfort for the MMHEV.

Liu, Teng; Huo, Weiwei; Lu, Bing; Li, Jianwei

doi: 10.1002/ente.202300541pmid: N/A

With the development of intelligent autodriving vehicles, the co‐optimization of speed control and energy management under the insurance of safe and comfortable driving has become a vital issue. Herein, the adaptive cruise control scenario is discussed. A co‐optimization method for speed control and energy management for fuel cell vehicles is suggested to delay the degradation of energy sources while preserving fuel cell efficiency. A reward function based on a reinforcement learning (RL) algorithm is developed to optimize the safety coefficient, comfortability, car‐following efficiency, and economy at the speed control level. The RL agent learns to control vehicle speed while avoiding collisions and maximizing the cumulative rewards. To handle the problem of energy management, an adaptive equivalent consumption minimization strategy, which takes into account the deterioration of energy sources, is implemented at the energy management level. The results indicate that the suggested method reduces the demand power by 1.7%, increases the lifetime of power sources, and reduces equivalent hydrogen consumption by 9.4% compared to the model predictive control.

Chatterjee, Arindam; Ganguly, Dipsikha; Sundara, Ramaprabhu; Bhattacharya, Subramshu S.

doi: 10.1002/ente.202300576pmid: N/A

The shuttle effect of polysulfides with its corresponding capacity fading and safety issues is the major barrier in the realization of lithium–sulfur battery (LSB) technology despite having high energy density and high specific capacity. Solid ceramic electrolytes using poly(ethylene oxide) (PEO) matrix has attracted much interest due to their superior safety compared to their liquid electrolyte counterparts. However, cubic perovskite electrolytes suffer from considerable interfacial challenges with lithium metal anodes. Besides, ceramic electrolytes are difficult to process further due to their inherent brittleness. Herein, a novel high‐entropy cubic perovskite (HE‐LLZO) prepared by the ball‐milling method is designed to which PEO matrix is added along with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) for use as a solid‐state electrolyte (PEO–HE–LLZO–LiTFSI) in LSB. This electrolyte gives good ionic conductivity and blocks lithium dendrite formation as well. A novel transition metal rare‐earth‐based high‐entropy oxide is incorporated into the sulfur cathode for use as a host material to ameliorate the redox kinetics. A quasi‐solid‐state LSB is designed with transition metal rare‐earth oxide carbon nanotubes incorporated into sulfur as composite cathode and PEO–HE–LLZO–LiTFSI electrolyte. This study highlights the viability of designing high‐entropy materials as a solid‐state electrolyte for next‐generation all‐solid‐state LSBs.

Solomon, Mithran Daniel; Heineken, Wolfram; Scheffler, Marcel; Birth‐Reichert, Torsten

doi: 10.1002/ente.202300785pmid: N/A

The global energy landscape faces significant challenges, necessitating a transition toward alternative energy sources to mitigate energy consumption and greenhouse gas emissions. Hydrogen emerged as a versatile energy carrier with immense potential, particularly in the realm of transportation. However, the lack of a comprehensive hydrogen infrastructure poses a critical barrier to its widespread adoption. By examining various important factors including the pressure level, transported capacity, trailer capacity, pipeline diameter, pressure drop, and transport distance, this study aims to optimize the hydrogen supply chain and improve the cost‐effectiveness of compressed hydrogen gas transportation. Five major delivery modes, encompassing compressed gas trucks and pipelines of varying diameters, are evaluated. This research offers valuable insights into the costs associated with hydrogen delivery within the European context. It reveals that the total levelized cost of hydrogen transportation (LCOHT) ranges from 0.3 to 3.44 € kg−1. These cost fluctuations are observed over transport distances that extend from 25 to 500 km and are dependent upon varying hydrogen demand levels, encompassing quantities of up to 100 000 kg per day. Based on the results, optimal choices for transport infrastructure are identified considering factors such as distance and hydrogen demand.

Li, Yanxia; He, Geping; HuangFu, Huijun; Mi, Yuanmei; Zhang, Huimin; Zheng, Donghao; Wu, Minye; Yuan, Hudie

doi: 10.1002/ente.202300749pmid: N/A

NiFe‐layered double hydroxide (NiFe‐LDH) as electrode materials for supercapacitors are successfully prepared by green and one‐step hydrothermal method without template. The controllable structure–performance relation of NiFe‐LDH nanoflower clusters (NCs) for green energy storage is realized by regulating reaction time. The morphology evolution of NiFe‐LDH is elucidated. NiFe‐LDH‐24 h offers a unique NC structure and has specific capacitance of 635.8 F g−1 at 1 A g−1, which is larger than one of the reported pure NiFe‐LDHs so far. The improved electrochemical performance of NiFe‐LDH‐24 h NCs is due to its unique structure and synergistic effect between components that cause the larger specific surface area and more electroactive sites for Faradic reaction. The reaction kinetics reveals the electrochemical energy storage mechanism of the NiFe‐LDH‐24 h NCs. The energy storage is contributed by diffusion and surface capacitance. The electrochemical performance of NiFe‐LDH‐24 h NCs is further modified for the first time by doping F, and the specific capacitance of F‐doped NiFe‐LDH‐24 h NCs (1942 F g−1) is increased by 3 times higher than that of NiFe‐LDH‐24 h NCs. This work provides a more solid theoretical basis for green energy storage through morphology control and doping modification strategies.

Shoji, Eiichi

doi: 10.1002/ente.202300604pmid: N/A

This study conducts field experiments using the radio‐wave energy harvester of hoop‐shaped radio (HOOPRA) to elucidate the relationship between the distance from the medium‐wave (MW) radio broadcasting station and the resonance voltage as an index of harvested energy. Accordingly, a numerical equation that describes the relationship between the distance and voltage with a strong correlation coefficient of R2 > 0.996 is derived. HOOPRA can illuminate ultrabright white, green, and red light‐emitting diodes (LEDs) within a 5 km radius of the public Nihon Hoso Kyokai JOFG (927 kHz, 5 kW) in Fukui, thereby serving as a valuable energy source for the 150 000 residents (60 000 households) in this region. The public JOAK (594 kHz, 300 kW) and JOAB (693 kHz, 500 kW) are examined for similar field experiments in the Kanto region. The results reveal that HOOPRA can illuminate ultrabright white, green, and red LEDs within a radius of 30 km and ultrabright red LEDs within a radius of 50 km from JOAB, which will benefit the 23 million residents (1.1 million households) in this region. Overall, the results provide novel insights for developing ultrawide‐area wireless energy‐transfer technology by leveraging the global infrastructure of MW radio broadcasting.

Dogan, Ebru; Altundag, Sebahat; Altin, Serdar; Arshad, Muhammad; Balci, Esra; Altin, Emine

doi: 10.1002/ente.202300837pmid: N/A

The Na0.67Mn0.5−xVxFe0.43Al0.07O2 (x = 0–0.1) samples are successfully produced and their structural properties are investigated by common techniques. The highest surface area is found as 4.94 m2 g−1 for x = 0.04 V by the Brunauer–Elmet–Teller analysis. According to X‐ray photoelectron spectroscopy of x = 0.04 V‐doped sample,V4+, and V5+ ions are formed in the structure. The main phase is observed as P63/mmc symmetry with an impurity phase of V6O13 for x ≥ 0.06 . According to the CV analysis, while the redox voltage decreases for the Mn3+/Mn4+ , the intensity of the peaks of Fe2+/Fe3+ redox reaction decreases. While the best capacity value of the half cells at C/3‐rate is obtained as 171 mAh g−1 for x = 0.04, the lowest capacity fade is found for x = 0.08 . It is mentioned the V6O13 may contribute to the electrochemical process . The galvanostatic tests are investigated for the voltage windows of 3.5–1.5, 4–1.5, 4–2.5, 4–2, and 4–2.5 V and it is seen that the battery cells for 3.5–1.5 V have the best capacity fade (6%) among the others. The Na0.67Mn0.46V0.04Fe0.43Al0.07O2/ hard carbon is used for the full cells with presodiated anode  and the first capacity value of the full cell is obtained as 80.2 mAh g−1 for C/2‐rate.