Pub Date : 2025-07-23DOI: 10.1016/j.elecom.2025.108007
Chuang Wang , Lidong You , Tingting Sun , Zichun Zhang
The two-dimensional W2C sparked widespread interest due to high physicochemical stability and large specific surface area. Fluoride-ion batteries (FIBs) are promising candidates in energy storage applications due to excellent properties such as high energy density. Despite such potential, the role of these materials in FIBs needs elucidation, especially regarding the effect of the fluoride ion transport mechanism on the material surface. In this study, the suitability of W2C as a cathode material for FIB was evaluated for the first time using the vacancy induction method based on first-principles calculations. The results show that the diffusion barrier for fluoride ions on the W2C surface is drastically reduced from 0.26 eV to 0.11 eV, and the ion transport efficiency is more than doubled, while a high theoretical voltage of 4.32 V and stable cycling at a concentration of 0–175 % F− are achieved. This is attributed to the fact that vacancy defects reduce the binding affinity of tungsten to fluoride ions and promote desorption of fluoride ions. This study highlights the importance of vacancy-induced techniques in enhancing 2D materials' ion transport capacity, providing valuable insights for advancing high-performance FIB designs.
{"title":"Two-dimensional W2C cathodes for fluoride-ion batteries: Achieving fast ion transport via vacancy induction","authors":"Chuang Wang , Lidong You , Tingting Sun , Zichun Zhang","doi":"10.1016/j.elecom.2025.108007","DOIUrl":"10.1016/j.elecom.2025.108007","url":null,"abstract":"<div><div>The two-dimensional W<sub>2</sub>C sparked widespread interest due to high physicochemical stability and large specific surface area. Fluoride-ion batteries (FIBs) are promising candidates in energy storage applications due to excellent properties such as high energy density. Despite such potential, the role of these materials in FIBs needs elucidation, especially regarding the effect of the fluoride ion transport mechanism on the material surface. In this study, the suitability of W<sub>2</sub>C as a cathode material for FIB was evaluated for the first time using the vacancy induction method based on first-principles calculations. The results show that the diffusion barrier for fluoride ions on the W<sub>2</sub>C surface is drastically reduced from 0.26 eV to 0.11 eV, and the ion transport efficiency is more than doubled, while a high theoretical voltage of 4.32 V and stable cycling at a concentration of 0–175 % F<sup>−</sup> are achieved. This is attributed to the fact that vacancy defects reduce the binding affinity of tungsten to fluoride ions and promote desorption of fluoride ions. This study highlights the importance of vacancy-induced techniques in enhancing 2D materials' ion transport capacity, providing valuable insights for advancing high-performance FIB designs.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108007"},"PeriodicalIF":4.2,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144764059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-23DOI: 10.1016/j.elecom.2025.108010
Oluwasegun Emmanuel Ojodun, Patrick Ehi Imoisili, Tien-Chien Jen
This work studies the structural and electrochemical characteristics of nickel oxide (NiO) and nickel oxide/carbon nanotubes (NiO/CNT) nanocomposites prepared via spray pyrolysis and annealed at 350, 400, and 500 . Structural characterization using X-ray diffraction (XRD) confirms phase purity and crystallinity. The NiO and NiO/CNT samples annealed at 400 °C (400-N and 400-NCT) exhibited optimal performance. Scanning electron microscopy (SEM) images of 400-NCT revealed a compact morphology with well-dispersed CNTs across the NiO nanoparticles. From Brunauer-Emmett-Teller (BET) analysis, its specific surface area was 93.82 m2 g−1, broader than 400-N's 35.63 m2 g−1, while its pore volume was 0.43 cm3 g−1, larger than 0.13 cm3 g−1 for 400-N. Moreover, 400-NCT displayed higher specific capacitance of 745 F g−1 at 5 A g−1, better rate capability (30.7 %), and superior cycle life (109 % @ 1000 cycles) than 400-N (16.20 F g−1, 26 % rate retention, and 21 % longevity @ 1000 cycles) in 2 M KOH. From electrochemical impedance spectroscopy, 400-NCT portrayed the lowest series and charge transfer resistance (6.60 Ω; 2.28 Ω) than 400-N (7.83 Ω; 20.41 Ω), demonstrating enhanced conductivity. The synergistic combination of CNTs and NiO in the nanocomposite is responsible for the enhanced performance, which boosts the conductivity, enlarges the surface area, and optimizes the pore network for rapid ion transport and enhanced charge storage. These findings show how modifying a process parameter in a facile and affordable method like spray pyrolysis can yield optimal results, contributing to realizing Sustainable Development Goal 7 (SDG 7) of affordable and sustainable energy solutions.
{"title":"Thermal annealing-induced structural modifications and electrochemical enhancement of NiO/CNT electrodes synthesized by spray pyrolysis for high-performance supercapacitors","authors":"Oluwasegun Emmanuel Ojodun, Patrick Ehi Imoisili, Tien-Chien Jen","doi":"10.1016/j.elecom.2025.108010","DOIUrl":"10.1016/j.elecom.2025.108010","url":null,"abstract":"<div><div>This work studies the structural and electrochemical characteristics of nickel oxide (NiO) and nickel oxide/carbon nanotubes (NiO/CNT) nanocomposites prepared via spray pyrolysis and annealed at 350, 400, and 500 <span><math><mrow><msup><mrow></mrow><mo>°</mo></msup><mi>C</mi></mrow></math></span>. Structural characterization using X-ray diffraction (XRD) confirms phase purity and crystallinity. The NiO and NiO/CNT samples annealed at 400 °C (400-N and 400-NCT) exhibited optimal performance. Scanning electron microscopy (SEM) images of 400-NCT revealed a compact morphology with well-dispersed CNTs across the NiO nanoparticles. From Brunauer-Emmett-Teller (BET) analysis, its specific surface area was 93.82 m<sup>2</sup> g<sup>−1</sup>, broader than 400-N's 35.63 m<sup>2</sup> g<sup>−1</sup>, while its pore volume was 0.43 cm<sup>3</sup> g<sup>−1</sup>, larger than 0.13 cm<sup>3</sup> g<sup>−1</sup> for 400-N. Moreover, 400-NCT displayed higher specific capacitance of 745 F g<sup>−1</sup> at 5 A g<sup>−1</sup>, better rate capability (30.7 %), and superior cycle life (109 % @ 1000 cycles) than 400-N (16.20 F g<sup>−1</sup>, 26 % rate retention, and 21 % longevity @ 1000 cycles) in 2 M KOH. From electrochemical impedance spectroscopy, 400-NCT portrayed the lowest series and charge transfer resistance (6.60 Ω; 2.28 Ω) than 400-N (7.83 Ω; 20.41 Ω), demonstrating enhanced conductivity. The synergistic combination of CNTs and NiO in the nanocomposite is responsible for the enhanced performance, which boosts the conductivity, enlarges the surface area, and optimizes the pore network for rapid ion transport and enhanced charge storage. These findings show how modifying a process parameter in a facile and affordable method like spray pyrolysis can yield optimal results, contributing to realizing Sustainable Development Goal 7 (SDG 7) of affordable and sustainable energy solutions.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108010"},"PeriodicalIF":4.7,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-23DOI: 10.1016/j.elecom.2025.108008
Basit Ali Khan , Fengqi Zhou , Tongsheng Zhang , Shams ur Rahman , Attia Sadiq , Farasat Haider , Fazila Shafique , Rafaqat Hussain , Jaweria Khalid
In this study, NiSe2/GO composites were successfully synthesized by using a facile and effective chemical method to increase the catalytic activity and charge transfer efficiency for oxygen evolution reaction (OER). The structural analysis confirmed the successful preparation of NiSe2 and NiSe2-GO (10 %, 25 %) composites. Similarly, the morphology of NiSe2 appeared to be nanocubes, whilst NiSe2-GO (10 %, 25 %) composites revealed features comprising of both NiSe2 nanocubes and GO sheets. The electrochemical performance of NiSe2 and NiSe2-GO (10 %, 25 %) composites was also investigated for enhanced OER. Among the synthesized compositions, NiSe2–25 % GO demonstrated the most superior electrocatalytic performance, which exhibited a significantly lower Tafel slope (66 mV/dec at 10 mV/s). Electrochemical impedance spectroscopy (EIS) analysis further confirmed the high efficiency of NiSe2–25 % GO, where a smallest semicircle in the Nyquist plot was observed. In terms of overpotential, NiSe2–25 % GO achieved a remarkably low value of ∼350 mV, demonstrating superior catalytic efficiency compared to NiSe2–10 % GO (∼500 mV) and pristine NiSe2 (∼600 mV). The significantly reduced overpotential suggested that the NiSe2–25 % GO material required the least energy input to drive the reaction at a given current density. This enhanced performance was attributed to the synergistic effect between NiSe2 and GO, where the GO matrix provided a favorable pathway for electron transfer, while NiSe2 acted as an active catalytic site for OER. These findings highlight NiSe2–25 % GO as a highly effective and promising electrocatalyst for OER applications. Its superior charge transport characteristics, lower overpotential, and faster reaction kinetics make it a strong candidate for next-generation energy conversion and storage technologies.
{"title":"Synthesis and exploration of NiSe2-GO composites as electrocatalysts with high-performance oxygen evolution reaction","authors":"Basit Ali Khan , Fengqi Zhou , Tongsheng Zhang , Shams ur Rahman , Attia Sadiq , Farasat Haider , Fazila Shafique , Rafaqat Hussain , Jaweria Khalid","doi":"10.1016/j.elecom.2025.108008","DOIUrl":"10.1016/j.elecom.2025.108008","url":null,"abstract":"<div><div>In this study, NiSe<sub>2</sub>/GO composites were successfully synthesized by using a facile and effective chemical method to increase the catalytic activity and charge transfer efficiency for oxygen evolution reaction (OER). The structural analysis confirmed the successful preparation of NiSe<sub>2</sub> and NiSe<sub>2</sub>-GO (10 %, 25 %) composites. Similarly, the morphology of NiSe<sub>2</sub> appeared to be nanocubes, whilst NiSe<sub>2</sub>-GO (10 %, 25 %) composites revealed features comprising of both NiSe<sub>2</sub> nanocubes and GO sheets. The electrochemical performance of NiSe<sub>2</sub> and NiSe<sub>2</sub>-GO (10 %, 25 %) composites was also investigated for enhanced OER. Among the synthesized compositions, NiSe<sub>2</sub>–25 % GO demonstrated the most superior electrocatalytic performance, which exhibited a significantly lower Tafel slope (66 mV/dec at 10 mV/s). Electrochemical impedance spectroscopy (EIS) analysis further confirmed the high efficiency of NiSe<sub>2</sub>–25 % GO, where a smallest semicircle in the Nyquist plot was observed. In terms of overpotential, NiSe<sub>2</sub>–25 % GO achieved a remarkably low value of ∼350 mV, demonstrating superior catalytic efficiency compared to NiSe<sub>2</sub>–10 % GO (∼500 mV) and pristine NiSe<sub>2</sub> (∼600 mV). The significantly reduced overpotential suggested that the NiSe<sub>2</sub>–25 % GO material required the least energy input to drive the reaction at a given current density. This enhanced performance was attributed to the synergistic effect between NiSe<sub>2</sub> and GO, where the GO matrix provided a favorable pathway for electron transfer, while NiSe<sub>2</sub> acted as an active catalytic site for OER. These findings highlight NiSe<sub>2</sub>–25 % GO as a highly effective and promising electrocatalyst for OER applications. Its superior charge transport characteristics, lower overpotential, and faster reaction kinetics make it a strong candidate for next-generation energy conversion and storage technologies.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108008"},"PeriodicalIF":4.2,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144722280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-19DOI: 10.1016/j.elecom.2025.108001
Young Ji Park , Sang Hyo Jeong , Younki Lee , Tae Wook Kang , Sun Woog Kim
In this study, MnO2 was synthesized via a hydrothermal method using four different oxidizing agents: KMnO4, K2S2O8, KClO3, and (NH4)2S2O8. The KMnO4 precursor led to the formation of aggregated α-MnO₂, while K2S2O8 produced a mixed phase of α- and γ-MnO2. (NH4)2S2O8 promoted the formation of γ-MnO2 at lower temperatures and induced a structural transition to β-MnO2 at elevated temperatures. Among the lithium precursors investigated, LiOH was found to be the most effective in preserving the spherical morphology of LiMn2O4 during synthesis. Electrochemical measurements revealed that the LiMn2O4 sample synthesized from γ-MnO2 exhibited the highest charge capacity of 132.59 mAh∙g−1, while the α-MnO2-based LiMn2O4 demonstrated the best stability. These results indicate that the initial MnO2 phase significantly influences the electrochemical performance of the resulting spinel cathode.
{"title":"Phase- and morphology-controlled MnO2: Its synthesis and influence on the electrochemical performance of spinel LiMn2O4 cathode materials","authors":"Young Ji Park , Sang Hyo Jeong , Younki Lee , Tae Wook Kang , Sun Woog Kim","doi":"10.1016/j.elecom.2025.108001","DOIUrl":"10.1016/j.elecom.2025.108001","url":null,"abstract":"<div><div>In this study, MnO<sub>2</sub> was synthesized via a hydrothermal method using four different oxidizing agents: KMnO<sub>4</sub>, K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>, KClO<sub>3</sub>, and (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>. The KMnO<sub>4</sub> precursor led to the formation of aggregated α-MnO₂, while K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> produced a mixed phase of α- and γ-MnO<sub>2</sub>. (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub> promoted the formation of γ-MnO<sub>2</sub> at lower temperatures and induced a structural transition to β-MnO<sub>2</sub> at elevated temperatures. Among the lithium precursors investigated, LiOH was found to be the most effective in preserving the spherical morphology of LiMn<sub>2</sub>O<sub>4</sub> during synthesis. Electrochemical measurements revealed that the LiMn<sub>2</sub>O<sub>4</sub> sample synthesized from γ-MnO<sub>2</sub> exhibited the highest charge capacity of 132.59 mAh∙g<sup>−1</sup>, while the α-MnO<sub>2</sub>-based LiMn<sub>2</sub>O<sub>4</sub> demonstrated the best stability. These results indicate that the initial MnO<sub>2</sub> phase significantly influences the electrochemical performance of the resulting spinel cathode.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108001"},"PeriodicalIF":4.7,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1016/j.elecom.2025.108006
Yi Zhang , Chen Ji , Xingtian Wang , Bin Qiu , Huaiyu Chen
The development of cost-effective and high-performance electrochemical sensors for uric acid (UA) detection is critical due to its role as a key biomarker in disease diagnosis. This study presents an innovative sensor based on platinum nanoparticle (Pt NPs) decorated graphdiyne (GDY) nanohybrid (denoted as Pt NPs/GDY), fabricated via a facile electroless deposition method. The hybrid material capitalizes on the synergistic effects of GDY's π-electron-rich structure - enhancing target affinity through π-π stacking, and Pt NPs' dual functionality as conductivity boosters and catalytic activators. Electrochemical evaluations revealed that the Pt NPs/GDY-modified glassy carbon electrode (GCE) outperforms conventional GDY/GCE and bare GCE, achieving a broad linear range (0.1–7.5 μM) and an ultralow detection limit (30 nM). The sensor also demonstrated exceptional reproducibility, long-term stability, and selectivity against common interferents, validated by successful UA quantification in human urine samples (92.8–98.5 % recovery).
{"title":"Electrochemical detection of uric acid based on platinum nanoparticles/graphdiyne hybrids","authors":"Yi Zhang , Chen Ji , Xingtian Wang , Bin Qiu , Huaiyu Chen","doi":"10.1016/j.elecom.2025.108006","DOIUrl":"10.1016/j.elecom.2025.108006","url":null,"abstract":"<div><div>The development of cost-effective and high-performance electrochemical sensors for uric acid (UA) detection is critical due to its role as a key biomarker in disease diagnosis. This study presents an innovative sensor based on platinum nanoparticle (Pt NPs) decorated graphdiyne (GDY) nanohybrid (denoted as Pt NPs/GDY), fabricated via a facile electroless deposition method. The hybrid material capitalizes on the synergistic effects of GDY's π-electron-rich structure - enhancing target affinity through π-π stacking, and Pt NPs' dual functionality as conductivity boosters and catalytic activators. Electrochemical evaluations revealed that the Pt NPs/GDY-modified glassy carbon electrode (GCE) outperforms conventional GDY/GCE and bare GCE, achieving a broad linear range (0.1–7.5 μM) and an ultralow detection limit (30 nM). The sensor also demonstrated exceptional reproducibility, long-term stability, and selectivity against common interferents, validated by successful UA quantification in human urine samples (92.8–98.5 % recovery).</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108006"},"PeriodicalIF":4.2,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144764062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The spatial arrangement of biorecognition molecules on the sensor surface plays a critical role in determining the performance of electrochemical biosensors. In this work, we report a covalent and tunable immobilization strategy using aryl diazonium chemistry to functionalize carbon electrodes with ethynyl groups protected by trimethylsilyl (TMS) or triisopropylsilyl (TIPS) moieties. After deprotection, an azide-modified aptamer (APT) specific to diclofenac (DCF) was immobilized via copper-catalyzed azide–alkyne cycloaddition (CuAAC). Although the TMS and TIPS groups differ in size by only 1.7 Å, this small variation significantly influenced APT spacing and sensor performance. The TIPS-based sensor displayed a nearly fourfold increase in signal response compared to the TMS-based counterpart, achieving a limit of detection of 17.95 μM. These results underscore the importance of nanoscale molecular design in optimizing label-free aptasensor sensitivity.
{"title":"Surface organization of aptamers via diazonium grafting: A key parameter in label-free electrochemical sensing","authors":"Teodora Lupoi , Bogdan Feier , Florence Geneste , Cecilia Cristea , Yann R. Leroux","doi":"10.1016/j.elecom.2025.108000","DOIUrl":"10.1016/j.elecom.2025.108000","url":null,"abstract":"<div><div>The spatial arrangement of biorecognition molecules on the sensor surface plays a critical role in determining the performance of electrochemical biosensors. In this work, we report a covalent and tunable immobilization strategy using aryl diazonium chemistry to functionalize carbon electrodes with ethynyl groups protected by trimethylsilyl (TMS) or triisopropylsilyl (TIPS) moieties. After deprotection, an azide-modified aptamer (APT) specific to diclofenac (DCF) was immobilized via copper-catalyzed azide–alkyne cycloaddition (CuAAC). Although the TMS and TIPS groups differ in size by only 1.7 Å, this small variation significantly influenced APT spacing and sensor performance. The TIPS-based sensor displayed a nearly fourfold increase in signal response compared to the TMS-based counterpart, achieving a limit of detection of 17.95 μM. These results underscore the importance of nanoscale molecular design in optimizing label-free aptasensor sensitivity.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108000"},"PeriodicalIF":4.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-16DOI: 10.1016/j.elecom.2025.108004
Xuanhe Liu , Baiqing Sun , Lehao Lin , Gaimei Zhang , Hui Li , Jiazi Shi , Min Wu , Dongdong Wang , Jiandong Lu , Kang Du , Xiaoli Song
The commercialization of supercapacitors hinges critically on developing low-cost electrode materials capable of simultaneously delivering high energy density and long-term stability. To address this challenge, we developed a dual‑nitrogen doping strategy using tris(hydroxymethyl)aminomethane (Tris) and urea to fabricate three-dimensional nitrogen-doped graphene (URNG) through a one-step hydrothermal process. Characterization of the material reveals that the optimized nitrogen conformation of URNG has a 2.07 % increase in pyrrole-N content compared to single nitrogen-source doped graphene (NG), a change that significantly enhances the charge storage capacity while maintaining structural integrity. Electrochemical measurements demonstrate that the assembled symmetric supercapacitor achieves a high energy density of 57.2 Wh·kg−1 at a power density of 670 W·kg−1. The URNG electrodes deliver a specific capacitance of 194.2 F·g−1 at 0.5 A·g−1 (17.1 % higher than NG) while maintaining 87 % capacitance retention after 5000 cycles. The practical applicability of this material was successfully demonstrated by powering a 1.8 V LED device. This work not only provides a facile synthesis strategy but also offers fundamental insights into nitrogen configuration control for advanced energy storage systems.
{"title":"Urea-Tris doped 3D graphene for high-stability supercapacitors","authors":"Xuanhe Liu , Baiqing Sun , Lehao Lin , Gaimei Zhang , Hui Li , Jiazi Shi , Min Wu , Dongdong Wang , Jiandong Lu , Kang Du , Xiaoli Song","doi":"10.1016/j.elecom.2025.108004","DOIUrl":"10.1016/j.elecom.2025.108004","url":null,"abstract":"<div><div>The commercialization of supercapacitors hinges critically on developing low-cost electrode materials capable of simultaneously delivering high energy density and long-term stability. To address this challenge, we developed a dual‑nitrogen doping strategy using tris(hydroxymethyl)aminomethane (Tris) and urea to fabricate three-dimensional nitrogen-doped graphene (URNG) through a one-step hydrothermal process. Characterization of the material reveals that the optimized nitrogen conformation of URNG has a 2.07 % increase in pyrrole-N content compared to single nitrogen-source doped graphene (NG), a change that significantly enhances the charge storage capacity while maintaining structural integrity. Electrochemical measurements demonstrate that the assembled symmetric supercapacitor achieves a high energy density of 57.2 Wh·kg<sup>−1</sup> at a power density of 670 W·kg<sup>−1</sup>. The URNG electrodes deliver a specific capacitance of 194.2 F·g<sup>−1</sup> at 0.5 A·g<sup>−1</sup> (17.1 % higher than NG) while maintaining 87 % capacitance retention after 5000 cycles. The practical applicability of this material was successfully demonstrated by powering a 1.8 V LED device. This work not only provides a facile synthesis strategy but also offers fundamental insights into nitrogen configuration control for advanced energy storage systems.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"179 ","pages":"Article 108004"},"PeriodicalIF":4.2,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144772150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study developed an effective approach for improving the cycling performance of NCM811-based lithium-ion batteries (LIBs) at a charge rate of 5C. The charge–discharge performance of LIBs with pressure-treated NCM811 cathodes was investigated. The cathode coating, comprising NCM811, acetylene black, and polyvinylidene fluoride, was compressed at pressures of 10–40 MPa. Galvanostatic charge–discharge tests revealed that a treatment pressure of 40 MPa improved the storage performance at ≥5C under the LIB full-cell configuration. After pressure treatment, NCM811-based LIBs exhibited excellent cycling stability over 500 charge–discharge cycles at 5C. After 500 cycles, energy-dispersive X-ray analysis confirmed that the dissolution of transition metals from the NCM811 cathode and their deposition at the graphite anode were inhibited. High-pressure treatment modified the morphology of the NCM811 cathodes, resulting in favorable electrochemical properties. The proposed NCM811 electrodes are promising for the development of power-type LIBs with high energy densities and long cycle lifetimes.
{"title":"Cycling stability of lithium-ion batteries with pressure-treated NCM811 cathodes","authors":"Yusuke Abe, Yuki Kumagai, Mahmudul Kabir, Seiji Kumagai","doi":"10.1016/j.elecom.2025.108002","DOIUrl":"10.1016/j.elecom.2025.108002","url":null,"abstract":"<div><div>This study developed an effective approach for improving the cycling performance of NCM811-based lithium-ion batteries (LIBs) at a charge rate of 5C. The charge–discharge performance of LIBs with pressure-treated NCM811 cathodes was investigated. The cathode coating, comprising NCM811, acetylene black, and polyvinylidene fluoride, was compressed at pressures of 10–40 MPa. Galvanostatic charge–discharge tests revealed that a treatment pressure of 40 MPa improved the storage performance at ≥5C under the LIB full-cell configuration. After pressure treatment, NCM811-based LIBs exhibited excellent cycling stability over 500 charge–discharge cycles at 5C. After 500 cycles, energy-dispersive X-ray analysis confirmed that the dissolution of transition metals from the NCM811 cathode and their deposition at the graphite anode were inhibited. High-pressure treatment modified the morphology of the NCM811 cathodes, resulting in favorable electrochemical properties. The proposed NCM811 electrodes are promising for the development of power-type LIBs with high energy densities and long cycle lifetimes.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"178 ","pages":"Article 108002"},"PeriodicalIF":4.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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