Arushee Rajeev, Arpit Thomas, Sai Sabareesh K.S., Harpreet Singh Arora
{"title":"In Situ Synthesis of Bifunctional NiMn Hybrid Oxides for High-Performance Flexible Supercapacitors and Oxygen Evolution Reaction","authors":"Arushee Rajeev, Arpit Thomas, Sai Sabareesh K.S., Harpreet Singh Arora","doi":"10.1002/ente.202402270","DOIUrl":"https://doi.org/10.1002/ente.202402270","url":null,"abstract":"<p>Ni-based binary alloy compositions are considered promising materials for energy storage and catalysis applications. Herein, a highly simplistic and efficient technique is reported for synthesizing NiMn hybrid oxyhydroxides as a bifunctional electrode for flexible supercapacitors and an efficient oxygen evolution reaction (OER) catalyst. The synthesis approach involves Ni and Mn coelectrodeposition under a controlled oxygenated environment over a flexible stainless-steel substrate. The developed electrodes exhibit an excellent specific capacitance of 633.54 F g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup>, matching one of the best-reported values in the literature. A symmetric device demonstrates a remarkable energy density of 45 Wh kg<sup>−1</sup> at a power density of 181.22 W kg<sup>−1</sup>. The device shows an excellent cyclic stability of 89.5% after 10 000 cycles. In addition, the NiMn oxyhydroxide electrode showed a remarkable performance in OER with overpotential values of only 282 and 312 mV at 500 and 1000 mA cm<sup>−2</sup> current density, surpassing many well-reported studies in the literature. The current study provides a facile and efficient strategy for synthesizing bifunctional electrodes for high-performance energy storage devices and catalysts for OERs.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aiswarya Samridh, Sumol V. Gopinadh, Bibin John, Sujatha Sarojiniamma, Mercy Thelakkattil Devassia, Mary Gladis Joseph
{"title":"Sustainable Binder System: Cross-Linked Tamarind Gum-Polyacrylic Acid for Silicon-Graphite Anodes in Future Lithium-Ion Batteries","authors":"Aiswarya Samridh, Sumol V. Gopinadh, Bibin John, Sujatha Sarojiniamma, Mercy Thelakkattil Devassia, Mary Gladis Joseph","doi":"10.1002/ente.202401837","DOIUrl":"https://doi.org/10.1002/ente.202401837","url":null,"abstract":"<p>Silicon (Si), with high theoretical specific capacity, the most promising anode material to replace graphite in lithium-ion battery (LIB) systems, is studied. The large volume changes during cycling cause cracking, fragmentation of Si, and electrical isolation of the Si active material from the current collector. The combined use of Si and graphite (Si-Gr) provides the best option to achieve high energy densities in commercial LIB systems. The different physical and chemical surface properties of silicon and graphite necessitate designing a binder capable of restraining volume changes. The present study focuses on the effectiveness of crosslinking naturally abundant and water-soluble tamarind gum (TG) with polyacrylic acid (PAA) as binder. Crosslinking of TG and PAA, confirmed by FTIR, has aided an optimum balance between the binding strength, swelling, and better electrode integrity during the cycling than PAA-based anodes. It exhibits an initial specific capacity of 872 mAh/g and coulombic efficiency of 70%. The capacity retention is ≈60% at the end of 900 cycles. The crosslinked TG-PAA binder facilitates Li<sup>+</sup> transportation there by maintaining rate capability in the anode. The results provide a promising avenue for pursuing environment-friendly processing of high-capacity LIBs with an extended cycle life using crosslinked biopolymer as binder.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Omar Mbrouk, Hoda R. Galal, Walied A. A. Mohamed, Mohamed Sabry Abdel-Mottaleb, Hoda Hafez
{"title":"Stimulated Photocatalytic Plasmonic–TiO2 Nanohybrid for Ecoremediation and Energy: Recent Advances and Challenges","authors":"Omar Mbrouk, Hoda R. Galal, Walied A. A. Mohamed, Mohamed Sabry Abdel-Mottaleb, Hoda Hafez","doi":"10.1002/ente.202401991","DOIUrl":"https://doi.org/10.1002/ente.202401991","url":null,"abstract":"<p>Plasmonic photocatalysis represents a highly promising area of research, as it enables the efficient exploitation of a broad spectrum of solar energy. Among the different photocatalysts, titanium dioxide (TiO<sub>2</sub>) has emerged as a pre-eminent photocatalyst owing to its remarkable catalytic attributes. Its abundant active sites and high surface-to-volume ratio enable synergistic interactions with plasmonic metal nanoparticles, including silver, gold, and palladium, leading to significantly enhanced photocatalytic activity. These hybrid nanostructured materials based on TiO<sub>2</sub> photocatalysts have many advances and challenges for many potential applications in environment and energy production. This phenomenon can be attributed to the efficient separation of charge carriers, coupled with the strategic tuning of the photocatalyst's optical response to extend into extended wavelength regions, specifically within the near-infrared and visible spectra.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 6","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144273192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Waste-Derived Activated Carbon for Supercapacitors: Current Trends and Future Prospects","authors":"Shailendra Rajput, Varee Tyagi, Sonika, Ratikanta Nayak, Sushil Kumar Verma","doi":"10.1002/ente.202401977","DOIUrl":"https://doi.org/10.1002/ente.202401977","url":null,"abstract":"<p>The primary challenge for supercapacitor technology lies in achieving battery-level performance while reducing costs. Enhancing energy density involves strategic adjustments such as increasing capacitance, reliance on electrode–electrolyte interactions, or boosting cell voltage, dependent on electrolyte stability. Thus, optimizing energy density requires careful electrode material design and electrolyte selection. Because of their abundant availability, exceptional performance, and simple processing methods, various naturally occurring bio-wastes and industrial wastes have been explored for the production of activated carbon for supercapacitors. Additionally, agricultural by-products such as sugarcane bagasse, rice husk, tea waste, coconut shell, peanut shell, lotus stem, and hemp fiber show promise as raw materials for graphene synthesis. Life cycle assessments beyond greenhouse gas emissions and energy efficiency, along with calibrated evaluation techniques and techno-economic analyses, are essential for meaningful sustainability comparisons. The rapid expansion of the bioenergy sector underscores the need for responsible management and sustainability evaluations. This article emphasizes the potential of waste-derived activated carbon as a sustainable and efficient electrode material for supercapacitors.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Galfenol-Based Magnetostrictive Energy Harvester for Structural Health Monitoring of Bridges Under Vehicular Loads","authors":"Shamik Dasadhikari, Debabrata Roy, Sotoshi Yamada","doi":"10.1002/ente.202402039","DOIUrl":"https://doi.org/10.1002/ente.202402039","url":null,"abstract":"<p>The objective of this work is to create a magnetostrictive energy harvester (MEH) using Galfenol to assess the structural health of bridges under automotive loads. The MEH is subjected to controlled vibrations—square, triangular, and sinusoidal waves—using a modified cantilever configuration. It generates a voltage difference across the pickup coil terminals using a Galfenol transducer as the magnetostrictive material, which is then converted into steady DC voltage via a rectification cum warning circuit. The effectiveness of the energy harvester has been confirmed through an experimental setup and expanded to monitor the state of a prototype bridge. The MEH produces varying voltages in response to vibrations in its surroundings, allowing for the differentiation between the healthy condition and the declining condition of bridges. Additionally, an adaptive neuro-fuzzy inference system enables the creation of predictive models based on the existing experimental data. This provides vital insights into the viability of real-time monitoring and early detection of structural anomalies in bridge structures. This study demonstrates the effectiveness of utilizing Galfenol-based magnetostrictive energy harvesting to enhance the safety and efficiency of infrastructure maintenance. This technology additionally enhances the durability and long-term viability of transportation networks.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Impedance Spectroscopic and Electrical Equivalent Circuit Analysis of Indium Tin Oxide/n-CdS/p-Si Heterojunction Solar Cell Using SCAPS-1d and Impedance Spectroscopic Modules","authors":"Prakash Kumar Jha, Ritesh Kumar Chourasia, Ankita Srivastava, Atish Kumar Sharma, Keyur Sangani, Nitesh K. Chourasia","doi":"10.1002/ente.202402031","DOIUrl":"https://doi.org/10.1002/ente.202402031","url":null,"abstract":"<p>The impedance spectroscopic (IS) and electrical equivalent circuit analysis of the popular combination indium tin oxide/n-CdS/p-Si heterojunction solar cell is being carried out for the very first time in this analytical study using solar cell capacitance simulator (SCAPS)-1d and the IS module. In this analysis, it is aimed to uncover the device's inherent characteristics for the purpose of future advancements and improvements. Various characteristics and features, as well as the basis for future device improvements, are uncovered through rigorous analysis of the following variables: forward/reverse bias voltage, frequency, illumination intensities (dark and light mode), wavelength-dependent capacitance–voltage, conductance-voltage, capacitance–frequency, and capacitance–temperature. Additionally, spectral response (SR) charts that rely on wavelength are created in addition to Nyquist and Bode plots. The acquired impedance data is much enhanced by these displays. Through IS analysis, a potent method for investigating the dynamics of electrical and ionic charges inside cells is revealed. An improved comprehension of the internal voltage and doping profile in the layers is achieved through additional Mott–Schottky analysis. Bode graphs that rely on frequency provide a better way to comprehend the device's dielectric characteristics. The SR curve can be better understood with the help of these graphs.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Impact of Ammonium Triflate on Iota Carrageenan Solid Biopolymer Electrolytes for Electrochemical Devices","authors":"Moniha Vijayan, Venkatesh Kaliyaperumal, Premalatha Manavalan, Monisha Sampath, Selvalakshmi Selvasankar, Premkumar Rajendran, Alagar Marimuthu, Sundaresan Balakrishnan","doi":"10.1002/ente.202401586","DOIUrl":"https://doi.org/10.1002/ente.202401586","url":null,"abstract":"<p>A free-standing, flexible polysaccharide-based natural solid polymer electrolyte composed of i-Carrageenan doped with various concentrations of ammonium triflate is created via the solution casting approach. An investigation was conducted into the effects of ionic dopant on the structural, vibrational, thermal, dielectric, transport, and electrochemical properties of created solid polymer electrolyte. Structural analysis (X-ray difraction and Fourier transform infrared spectroscopy) proves the non-crystalline nature and the interaction between dopant salt and biopolymer. The maximum conductivity of 1.27 × 10<sup>−3 </sup>Scm<sup>−1</sup> is achieved for the sample containing 1 g i-Carrageenan and 0.3 wt% of ammonium triflate. Dielectric studies reveal that highest conducting membrane shows maximum <i>ε</i>′ and <i>ε</i>″ values. Thermal studies indicate that low glass transition temperature of 28 °C for the highest conducting membrane. Primary proton battery and single polymer electrolyte membrane fuel cell with the highest conducting membrane were fabricated, and their properties are examined. Open-circuit voltages of proton battery and fuel cell are observed to be 1.03 V and 631 mV, respectively.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143939115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Structural, Morphological, and Electrochemical Characterization of Polypyrrole-Enhanced Reduced Graphene Oxide/NiCoFe2O4 Ternary Composite for High-Performance Supercapacitors","authors":"Ansari Novman Nabeel, Alok Jain, Kailash Chandra Juglan, Sunita Bhagwa, Sajid Naeem","doi":"10.1002/ente.202402142","DOIUrl":"https://doi.org/10.1002/ente.202402142","url":null,"abstract":"<p>Supercapacitors’ exceptional energy density, quick charge and discharge rates, and long cycle life make them extremely promising energy storage technologies. The investigation of electrochemical performance is improved by mixing conductive polymers with reduced graphene oxide (rGO) and nickel cobalt ferrite (NiCoFe<sub>2</sub>O<sub>4</sub>). It produces a binary rGO/NiCoFe<sub>2</sub>O<sub>4</sub> composite synthesized by sol–gel autocombustion, which has a specific capacitance of 216.5 F g<sup>−1</sup> at 10 mV s<sup>−1</sup>. A ternary PPy/rGO/NiCoFe<sub>2</sub>O<sub>4</sub> composite is synthesized by adding polypyrrole (PPy), and at the same scan rate, it achieves a specific capacitance of 664.98 F g<sup>−1</sup>. Nickel foam is used as a substrate material for the electrode, and 3 M KOH is used as an electrolyte for electrochemical analysis. A high energy density of 90 W kg<sup>−1</sup> and a power density of 1167.14 W kg<sup>−1</sup> are also observed by electrochemical investigation and it can be used for supercapacitor applications.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Synthesis of N-Ethyl Carboxylic Acid Functionalized Polyethylenimine as Self-Crosslinking Aqueous Binder for LiFePO4 Cathode of Lithium-Ion Batteries","authors":"Dan Shao, Jinxin Huang, Aihua Wu, Yingjun Fang, Xiangfeng Li, Liangyong Hu, Cheng Chen, Lingzhi Zhang","doi":"10.1002/ente.202402066","DOIUrl":"https://doi.org/10.1002/ente.202402066","url":null,"abstract":"<p><i>N</i>-Ethyl carboxylic acid functionalized polyethyleneimine (<i>N</i>-CEPEI) has been explored as a novel water-solution binder for LiFePO<sub>4</sub> (LFP) cathodes, which is synthesized via Michael addition reaction of acrylic acid with the primary and secondary amines from PEI, followed by subsequent in situ condensation. The <i>N</i>-CEPEI binder facilitates the formation of a 3D polymer networks, which exhibits a higher diffusion efficacy of lithium ions and better mechanical strength compared to the commercial poly(vinylidene difluoride) (PVDF) binder, and thus maintains the structural integrity of LFP electrode. The electrochemical performance of the LFP electrode utilizing <i>N</i>-CEPEI binder is evaluated through cyclic voltammetry, electrochemical impedance spectroscopy, and long-cycle-life testing, and the results are compared with those of electrodes using PVDF and PEI binder. The optimal LFP electrode with <i>N</i>-CEPEI binder exhibits superior cycling stability and rate capability, delivering a capacity of 139.60 mAh g<sup>−1</sup> with a capacity retention of 94.8% after 400 cycles at 1 C, as compared with 86.6% for PVDF-LFP electrode. Even at a high rate of 5 C, the <i>N</i>-CEPEI-LFP electrode maintains a capacity of 80 mAh g<sup>−1</sup> after 500 cycles. This work highlights the potential of <i>N</i>-CEPEI as an effective water-solution binder for LFP-based lithium-ion batteries.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alexey V. Merkulov, Filipp S. Napolskiy, Anna A. Rudnykh, Tatyana A. Atlavinus, Ilia I. Tsiniaikin, Victor A. Krivchenko
{"title":"High-Power Primary Lithium Battery with Vanadium Oxide/Fluorocarbon-Based Cathode","authors":"Alexey V. Merkulov, Filipp S. Napolskiy, Anna A. Rudnykh, Tatyana A. Atlavinus, Ilia I. Tsiniaikin, Victor A. Krivchenko","doi":"10.1002/ente.202402061","DOIUrl":"https://doi.org/10.1002/ente.202402061","url":null,"abstract":"<p>The manuscript examines the applicability of the lithium-vanadium oxide-fluorocarbon electrochemical system for primary batteries with both high-power and high specific energy density. The influence of mass ratio of fluorinated carbon and vanadium oxide in the composition of the positive electrode on its specific characteristics is studied. At a low discharge current density of 0.17 mA cm<sup>−2</sup> the specific energy density is proportional to the mass fraction of CF<sub><i>x</i></sub> in cathode layer and achieves up to 900 Wh kg (cathode layer)<sup>−1</sup> for the cells with cathode active material composition V<sub>2</sub>O<sub>5</sub>:CF<sub><i>x</i></sub> = 100%:0% and up to 1800 Wh kg (cathode layer)<sup>−1</sup> for the cells with cathode active material composition V<sub>2</sub>O<sub>5</sub>:CF<sub><i>x</i></sub> = 0%:100%. At high current densities, cells with a cathode that corresponds to active material composition V<sub>2</sub>O<sub>5</sub>:CF<sub><i>x</i></sub> = 70%:30% have the highest specific energy density reaching up to 700 Wh kg (cathode layer)<sup>−1</sup> at 18 mA cm<sup>−2</sup> and 410 Wh kg (cathode layer)<sup>−1</sup> at 30 mA cm<sup>−2</sup>. The practical applicability of the considered electrochemical system is approved on the pouch cell prototypes with capacity of about 4 Ah, specific energy density of 420 Wh kg (pouch cell)<sup>−1</sup> and peak/continuous specific power of 1500/290 W kg (pouch cell)<sup>−1</sup>.</p>","PeriodicalId":11573,"journal":{"name":"Energy technology","volume":"13 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}