Journal of energy storage最新文献

Performance research of the aluminum-air battery with the alkaline PVA/PVP hybrid hydrogel electrolyte

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-04 DOI: 10.1016/j.est.2025.116420

Chunmei Liu , Pengju Wang , Xiaowei Yang , Zhenfei Liu

{"title":"Performance research of the aluminum-air battery with the alkaline PVA/PVP hybrid hydrogel electrolyte","authors":"Chunmei Liu , Pengju Wang , Xiaowei Yang , Zhenfei Liu","doi":"10.1016/j.est.2025.116420","DOIUrl":"10.1016/j.est.2025.116420","url":null,"abstract":"<div><div>Aluminum-air batteries (AABs) own many benefits including high energy densities, rich aluminum reserves, and environmental friendliness. For an AAB as a power source for the low-power microelectronics, the aqueous electrolyte leakage is its underlying problem. To tackle this issue, AABs adopt the hydrogel electrolytes. The hybrid hydrogels are prepared by physically crosslinking the polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) substances through thrice freezing-thawing processes. First, the four hydrogels with the different PVA:PVP mass ratios are characterized by the SEM, FTIR, and XPS tests. These results demonstrate the PVA/PVP hybrid hydrogels successfully introduce the PVP substance. The swelling rate of the PVA/PVP hydrogels increases with the PVP addition and the water retention ratio is the largest at 4:1 PVA:PVP ratio. By soaking these hybrid hydrogels into 6 mol L<sup>−1</sup> KOH electrolyte for 24 h, the alkaline PVA/PVP hydrogel electrolytes are formed. At the 4:1 PVA:PVP mass ratio, the alkaline stability of the hydrogels is strongest and its ionic conductivity (403.2 ± 2.1 mS cm<sup>−1</sup>) is highest. Then, under the various PVA:PVP mass ratios, KOH concentrations, and PVA/PVP hydrogel electrolyte thicknesses, the PVA/PVP-based AAB performance is assessed. At the 4:1 PVA:PVP mass ratio, 8 mol L<sup>−1</sup> KOH solution, and 6 mm thick hydrogel electrolyte, the AAB achieves an optimal performance. Its peak power density is 47.0 ± 2.2 mW cm<sup>−2</sup> and limiting current density is 117.0 ± 9.2 mA cm<sup>−2</sup>. Finally, the AAB stack from two PVA/PVP-based AABs connecting in series can light 40 LEDs.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116420"},"PeriodicalIF":8.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancing energy storage: The future trajectory of lithium-ion battery technologies

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-04 DOI: 10.1016/j.est.2025.116511

M.M. Hasan , R. Haque , M.I. Jahirul , M.G. Rasul , I.M.R. Fattah , N.M.S. Hassan , M. Mofijur

{"title":"Advancing energy storage: The future trajectory of lithium-ion battery technologies","authors":"M.M. Hasan , R. Haque , M.I. Jahirul , M.G. Rasul , I.M.R. Fattah , N.M.S. Hassan , M. Mofijur","doi":"10.1016/j.est.2025.116511","DOIUrl":"10.1016/j.est.2025.116511","url":null,"abstract":"<div><div>Lithium-ion batteries are pivotal in modern energy storage, driving advancements in consumer electronics, electric vehicles (EVs), and grid energy storage. This review explores the current state, challenges, and future trajectory of lithium-ion battery technology, emphasizing its role in addressing global energy demands and advancing sustainability. Despite achieving energy densities up to 300 Wh/kg, cycle lives exceeding 2000 cycles, and fast-charging capabilities, lithium-ion batteries face significant challenges, including safety risks, resource scarcity, and environmental impacts. Recycling inefficiencies and the need for sustainable material alternatives further underscore the urgency for innovation. This paper highlights recent breakthroughs in silicon-based anodes, solid-state electrolytes, and advanced cell designs, which promise to push energy densities beyond 400 Wh/kg and extend cycle lives to over 5000 cycles. Additionally, alternative battery technologies, such as solid-state, sodium-ion, and metal-air systems, are explored for their potential to complement or surpass lithium-ion batteries in specific applications. By bridging the gap between academic research and real-world implementation, this review underscores the critical role of lithium-ion batteries in achieving decarbonization, integrating renewable energy, and enhancing grid stability. Collaborative efforts among researchers, industry stakeholders, and policymakers are essential to overcoming these challenges and driving the transition to cleaner, more sustainable energy systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116511"},"PeriodicalIF":8.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detailed investigation of degradation modes and mechanisms of a cylindrical high-energy Li-ion cell cycled at different temperatures

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-04 DOI: 10.1016/j.est.2025.116486

Christina Schmitt , Dennis Kopljar , K. Andreas Friedrich

{"title":"Detailed investigation of degradation modes and mechanisms of a cylindrical high-energy Li-ion cell cycled at different temperatures","authors":"Christina Schmitt , Dennis Kopljar , K. Andreas Friedrich","doi":"10.1016/j.est.2025.116486","DOIUrl":"10.1016/j.est.2025.116486","url":null,"abstract":"<div><div>The temperature-dependent degradation of a cylindrical high-energy NCA/graphite-SiO<sub>x</sub> cell is investigated by a combination of in situ and post-mortem techniques. Cells are cycled at 10 °C, 25 °C and 35 °C, with periodic check-up tests to identify the degradation modes during aging. Differential voltage analysis (DVA) identifies the primary degradation modes over all temperatures as the loss of the silicon active material as well as the loss of lithium inventory. Electrochemical impedance spectroscopy, evaluated by the distribution of relaxation times and equivalent circuit modeling, shows that the resistance increase is temperature dependent with a sudden increase after the sudden failure of the cells for all resistances except the cathode impedance, which is primarily cycle dependent. Notably, reversible Li plating is observed by differential open circuit voltage analysis in cells aged at 10 °C, despite moderate charging currents. The evaluation of the Coulombic efficiency shows the onset of irreversible Li plating coincides with the sudden failure of the cells. An extensive post-mortem analysis is conducted including SEM/EDS, XRD and electrochemical measurements in a three-electrode set-up. Post-mortem results reveal a more inhomogeneous degradation at lower temperatures compared to higher temperatures. In addition, it exposes the extent of the loss of the cathode active material at higher temperatures, which is masked in the DVA of the full cell. These results highlight the significant impact of temperature on battery performance and degradation mechanisms and show the benefit of post-mortem analysis in addition to non-invasive characterization techniques.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116486"},"PeriodicalIF":8.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tri-functional binder: Graded hydrogen bonding as a bridge to endow SiO anodes self-healing and high cycling stability

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-04 DOI: 10.1016/j.est.2025.116496

Wenyi Li , Juan Ding , Weihua Wang, Siyi Jing, Huan Zhou, Zhouliang Tan, Yudai Huang

{"title":"Tri-functional binder: Graded hydrogen bonding as a bridge to endow SiO anodes self-healing and high cycling stability","authors":"Wenyi Li , Juan Ding , Weihua Wang, Siyi Jing, Huan Zhou, Zhouliang Tan, Yudai Huang","doi":"10.1016/j.est.2025.116496","DOIUrl":"10.1016/j.est.2025.116496","url":null,"abstract":"<div><div>The volume change of the SiO anode seriously affects the structural integrity and cycling stability of the electrode. To address this issue, a binder called TA-IA is proposed, which features strong adhesion capabilities, high mechanical strength, and elastic recovery functionality, thereby enhancing the cycle life of the SiO anode. This tri-functional binder (TA-IA) is synthesized by covalently cross-linking tapioca starch (TA) with itaconic acid (IA) molecules, forming a highly stretchable and strongly adherent three-dimensional (3D) network. This network effectively mitigates the impact of volume changes on SiO particles. Additionally, the cross-linked -O=C-O- bonds in the TA-IA binder establish more substantial graded hydrogen bond sites with SiO-OH, enhancing self-healing ability. The experimental results demonstrate that the SiO anode with TA-IA binder exhibits excellent cycling stability, maintaining a capacity of 992.2 mAh g<sup>−1</sup> at 2 A g<sup>−1</sup> after 400 cycles. Even under a high mass loading of 3 mg cm<sup>−2</sup>, the TA-IA/SiO electrode maintains stable cycling after 300 cycles at 1 A g<sup>−1</sup>. Ultimately, the assembled TA-IA/SiO||PVDF/NCM811 full cell retains an impressive retention ratio of 98.7% after 100 cycles at 1 C, highlighting its remarkable cycling stability and practicality. This work provides valuable insights for designing functional starch-based binders for high-performance SiO electrodes.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116496"},"PeriodicalIF":8.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green synthesis of high-quality V₂O₅/single-walled carbon nanotube composites via Trachyspermum Ammi leaf extract: A sustainable approach to sodium-ion battery anodes

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-04 DOI: 10.1016/j.est.2025.116505

Kaifee Sayeed , Azam Raza , Aditya Sadhanala , Absar Ahmad , Kavita Pandey

{"title":"Green synthesis of high-quality V₂O₅/single-walled carbon nanotube composites via Trachyspermum Ammi leaf extract: A sustainable approach to sodium-ion battery anodes","authors":"Kaifee Sayeed , Azam Raza , Aditya Sadhanala , Absar Ahmad , Kavita Pandey","doi":"10.1016/j.est.2025.116505","DOIUrl":"10.1016/j.est.2025.116505","url":null,"abstract":"<div><div>High-performance sodium-ion batteries (NIBs) are an essential alternative for sustainable energy storage amid growing concerns about limited lithium resources. Two-dimensional transition metal oxides (TMOs) particularly vanadium pentoxide (V₂O₅)-show great promise as electrode materials for NIBs. In this work, we report the first-ever sol-gel-assisted green synthesis of V₂O₅ using <em>Trachyspermum ammi (L.)</em> leaf extract, offering an eco-friendly route free from hazardous chemicals. The green-synthesized V₂O₅ (GS-V<sub>2</sub>O<sub>5</sub>) and its composite with single-walled carbon nanotubes (SWCNT) (GS-V<sub>2</sub>O<sub>5</sub>/SWCNT) exhibited reduced crystallite size and lower agglomeration compared to chemically synthesized V₂O₅ (CS-V<sub>2</sub>O<sub>5</sub>), demonstrating superior structural properties. The GS-V₂O₅/SWCNT composite exhibits a remarkable specific capacity of 527 mAh g<sup>−1</sup> at a current density of 50 mA g<sup>−1</sup>, significantly outperforming pristine GS-V₂O₅ (193 mAh g<sup>−1</sup>). It also achieves a 60.46 % initial coulombic efficiency (ICE), significantly higher than the 6.14 % for GS-V₂O₅ alone. Electrochemical impedance spectroscopy (EIS) reveals a sharp reduction in charge transfer resistance (<em>R</em><sub><em>ct</em></sub>) from 1822 Ω to 31 Ω upon SWCNT addition, and GITT analysis confirms a Na-ion diffusion coefficient of 1.53 × 10<sup>−10</sup> cm<sup>2</sup> s<sup>−1</sup>. Postmortem studies indicate that SWCNT incorporation preserves electrode integrity, enhances electrical percolation, and maintains stability during cycling. Collectively, these findings highlight the strong potential of bio-synthesized nanocomposites for safer, long-lasting, and higher-performance energy storage applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116505"},"PeriodicalIF":8.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible, temperature-tolerant supercapacitor based on Ti3C2Tx MXene in ionic liquid gel electrolyte

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-04 DOI: 10.1016/j.est.2025.116488

Jingdi Shang , Libo Wang , Ying Gao , Ji’a Yang , Qixun Xia , Qianku Hu , Aiguo Zhou , Bo Wang

{"title":"Flexible, temperature-tolerant supercapacitor based on Ti3C2Tx MXene in ionic liquid gel electrolyte","authors":"Jingdi Shang , Libo Wang , Ying Gao , Ji’a Yang , Qixun Xia , Qianku Hu , Aiguo Zhou , Bo Wang","doi":"10.1016/j.est.2025.116488","DOIUrl":"10.1016/j.est.2025.116488","url":null,"abstract":"<div><div>Due to its unique structure and performance, Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> has been widely investigated as an electrode material for flexible energy storage devices using hydrogel as a solid electrolyte. The composition and structure of hydrogels determine their poor performance at high temperatures and there is little research on MXene flexible devices at high temperature. In this work, we designed a method for preparing capacitors with Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> as the electrode material and ionic liquid as the electrolyte. By leveraging the high permeability of ionic polymer solution, a seamless electrode-electrolyte interface is constructed. The device can achieve a maximum capacitance of 173.8 mF cm<sup>−2</sup> at a 5 mV s<sup>−1</sup> scan rate, with a maximum specific energy density and power density of 96.57 μWh cm<sup>−2</sup> and 1.74 mW cm<sup>−2</sup>, respectively. The capacitor retains 89.5 % of its initial capacitance after 20,000 cycles, demonstrating excellent cycle stability. Importantly, the supercapacitor can operate at 100 °C with a specific capacitance of 278.66 mF cm<sup>−2</sup>. In addition, the designed device can retains 100 % or more of its capacitance even after 1000 cycles of 180° bending，demonstrating robust mechanical performance. This work provides a reference for studying the application of MXene in high-temperature flexible supercapacitor.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116488"},"PeriodicalIF":8.9,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reversible switching between quinoid and benzoid structures in PEDOT:PSS layer on CdS/CdSe photoanode for promoting photoelectrochemical performance

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-03 DOI: 10.1016/j.est.2025.116515

Dong-gyu Hurh, Jung Hyeun Kim

{"title":"Reversible switching between quinoid and benzoid structures in PEDOT:PSS layer on CdS/CdSe photoanode for promoting photoelectrochemical performance","authors":"Dong-gyu Hurh, Jung Hyeun Kim","doi":"10.1016/j.est.2025.116515","DOIUrl":"10.1016/j.est.2025.116515","url":null,"abstract":"<div><div>Environmental problems have made the development of sustainable energy technologies such as photoelectrochemical (PEC) cells essential. In this study, a poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS, PP) conductive polymer is successfully introduced onto a CdS/CdSe heterostructure, and an organic-inorganic hybrid CdS/CdSe/PP photoanode is fabricated using facile hydrothermal, chemical bath deposition, and spin coating methods. The PP polymer is a well-known conductive polymer with excellent hole transports, and it can enhance the PEC performance of a CdS/CdSe photoanode by infiltrating the heterostructure. Furthermore, PP improves the surface oxidation reaction with a hole scavenger by switching between quinoid and benzoid forms. The resulting CdS/CdSe/PP photoanode exhibits a significantly higher photocurrent density (21.8 mA cm<sup>−2</sup>) compared to CdS/CdSe (2.46 mA cm<sup>−2</sup>) and CdSe/PP (8.35 mA cm<sup>−2</sup>) photoanodes. During the fabrication of the photoanode, the CdS layer plays a crucial role in changing the final CdSe morphology from a cauliflower-like structure to a plate-like structure, which also affects the PP layer deposition characteristics. These findings highlight a new possibility for enhancing the PEC performance of photoanodes using a PP layer and a hole scavenger, and they also demonstrate the feasibility of manipulating the surface morphology of a CdS preformed layer.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116515"},"PeriodicalIF":8.9,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of a novel passive self-adaptive battery thermal regulator combining liquid immersion and PCM

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-03 DOI: 10.1016/j.est.2025.116356

Zhihong Zhang, Xiaole Yao, Jingshu Zhang, Xiaoqing Zhu, Chao Xu, Xing Ju

{"title":"Investigation of a novel passive self-adaptive battery thermal regulator combining liquid immersion and PCM","authors":"Zhihong Zhang, Xiaole Yao, Jingshu Zhang, Xiaoqing Zhu, Chao Xu, Xing Ju","doi":"10.1016/j.est.2025.116356","DOIUrl":"10.1016/j.est.2025.116356","url":null,"abstract":"<div><div>Battery thermal management is a significant technology for guaranteeing a safe and efficient operation. The hybrid battery thermal management system (hybrid BTMS), which combines phase change materials(PCM) and liquid cooling, is recognized as a promising method. However, studies on wide temperature range adaptive BTMS research are still limited. Efforts still need to improve the thermal management performance for a wide temperature range. To fill this research gap, a novel PCM-immersion hybrid thermal regulator, that adopted PCM and immersion coolant as internal heat absorption medium and utilized the cooling plate as the external heat sink, is proposed for application in BTMS for both high- and low-temperature environments. The volume change of PCM is cleverly used to achieve dynamic switching between air and liquid as the medium between the battery and the cooling plate, realizing the passive-adaptive to ambient temperature variation. A 3D transient model of a 280 Ah Li-ion battery module with the thermal regulator was developed. The influence of initial immersion depth, battery-cooling plate spacing, discharge rates, and ambient temperature were comprehensively studied. The optimal geometry design indicates an 80 mm initial immersion depth and a 3 mm battery-cooling plate spacing. For an ambient temperature of 25 °C, the maximum temperature and the maximum temperature difference were respectively below 38.46 °C and 2.95 °C at consecutive 0.5C discharge–charge cycles. At a -30 °C environment temperature, a 35 °C battery module’s heat preservation time above 0 °C was prolonged to 12,000 s. Additionally, the battery module with hybrid BTMS realized potential acceptable thermal insulation. From a cold state of -20 °C, when discharging at 0.25C, it can reach the allowable minimum charge temperature of 0 °C, and the capacity retention rate is 74.6%.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116356"},"PeriodicalIF":8.9,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Porous carbon materials prepared via thermally-induced phase separation for supercapacitors

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-03 DOI: 10.1016/j.est.2025.116257

Zhiping Han , Feifei Sun , Shuhai Chen , Yi Zhao , Tong Zhou , Wuhong Xin , Jin Zhou , Shuping Zhuo

{"title":"Porous carbon materials prepared via thermally-induced phase separation for supercapacitors","authors":"Zhiping Han , Feifei Sun , Shuhai Chen , Yi Zhao , Tong Zhou , Wuhong Xin , Jin Zhou , Shuping Zhuo","doi":"10.1016/j.est.2025.116257","DOIUrl":"10.1016/j.est.2025.116257","url":null,"abstract":"<div><div>Thermoplastic polyurethane (TPU) is an extensively used polymer that has caused environmental pollution. TPU-derived carbon has potential economic value for waste utilization as electrodes for supercapacitors, but transforming TPU into porous carbon materials with high specific surface area, suitable pore size distribution and good conductivity remains a difficult problem. Herein, three-dimensional porous TPU composite monomers with a macroporous structure were synthesized by a green and environmentally friendly thermal phase separation method, where the TPU skeleton was strategically broken and reconnected. An optimal TPU-derived porous carbon material pre‑carbonized at 350 °C (TPU-350) was successfully obtained. Benefiting from its effective chemical activation and ion accessibility due to phase separation-induced interconnected skeleton, the TPU-350 exhibits a specific gravimetric capacitance of 376.9 F g<sup>−1</sup> a current density of 1 A g<sup>−1</sup> in a 1 M H<sub>2</sub>SO<sub>4</sub> electrolyte. Notably, a two-electrode device based on TPU-350 could generate the high energy density of 10.39 Kh kg<sup>−1</sup> at a power density of 50 W kg<sup>−1</sup> and maintain 91.12 % of its initial capacitance at the end of 10,000 cycles.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116257"},"PeriodicalIF":8.9,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Passive combined heat transfer enhancement techniques for performance improvement of shell tube latent heat thermal energy storage

IF 8.9 2区工程技术

Journal of energy storage Pub Date : 2025-04-03 DOI: 10.1016/j.est.2025.116485

Nessrine Sayoud , Abdelghani Laouer , Mohamed Teggar , Nourddine Brihi , Müslüm Arıcı

{"title":"Passive combined heat transfer enhancement techniques for performance improvement of shell tube latent heat thermal energy storage","authors":"Nessrine Sayoud , Abdelghani Laouer , Mohamed Teggar , Nourddine Brihi , Müslüm Arıcı","doi":"10.1016/j.est.2025.116485","DOIUrl":"10.1016/j.est.2025.116485","url":null,"abstract":"<div><div>Latent heat thermal energy storage (LHTES) in heat exchangers, utilizing phase change materials (PCMs), is a key for managing power demand. The poor heat transfer characteristics of PCM are a challenge, therefore, improvements are continuously researched to increasing LHTES performance. This paper presents a 2D numerical study aiming to improve the latent storage system using a combination of techniques including dual PCMs and shape of pipe carrying the heat transfer fluid. Optimal PCM position is first determined to achieve fast storage process. Furthermore, two inner tubes with circular and elliptical shapes and their orientation and their impact on the charging process are investigated. Moreover, to further improve the thermal efficiency and accelerate the charging time, Al<sub>2</sub>O<sub>3</sub> nanoparticles are incorporated into the PCM placed at top of the heat exchanger to enhance heat transfer characteristics where lower melting rate is observed. Outcomes indicate that dual PCM technique with placing PCM of lower melting point at the bottom accelerates the storage process by 37.06 %. Additionally, using a double elliptical inner tube in the vertical position boosts the melting rate and gives better performance than using one or two circular tubes. Finally, adding nanoparticles to the top PCM leads to the fastest charging time, reducing hence the charging time by 83.3 %. These outcomes contribute to energy efficiency enhancement of latent heat storage systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116485"},"PeriodicalIF":8.9,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0