Nanomaterials
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2025
·Vol. 15
·期 13
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IF 4.3
Shenghua Yuan,Chengwen Ren,Ziwei Liu,Yu Chen,Wenhui Wang
Lithium-rich layered oxide (LLO) has received extensive attention from researchers due to its high initial discharge capacity (≥250 mAh g−1). However, defects such as its high initial irreversible capacity, voltage decay, and poor rate performance have severely limited its commercialization. These issues arise because the Li2MnO3component in LLO is activated during the initial cycle, leading to the participation of lattice oxygen anions (O2−) in redox reactions. This results in irreversible oxygen loss (O2) and subsequent structural phase transitions. To address these challenges, this study focuses on Li1.2Ni0.13Co0.13Mn0.54O2as the host material, utilizing abundant exposed (010) plane secondary particles and employing a vanadium (V) doping strategy to enhance electrochemical performance. The V forms strong V-O bonds with the lattice oxygen, effectively suppressing irreversible oxygen loss and improving structural stability. The results demonstrate that the LLO achieves the best electrochemical performance as the doping amount is 1 mol%, and the capacity retention improves from 74.5% (undoped) to 86% (V-doped) after 140 cycles at 0.5 C.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2025
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IF 4.6
Ishioma Laurene Egun,Qi Han,Tamar L. Greaves,Xiuhua Zhang,Yang Hou,Zhengfei Chen
Biomass-derived carbon has shown significant potential as an active electrode material for supercapacitors, primarily due to its intrinsic porous architecture and the presence of heteroatom dopants. However, achieving hierarchical porous carbon through a simple, single-stage thermal process with minimal resources is a significant challenge. In this study, we propose molten base carbonization and activation (MBCA) with wet biomass feedstock as a viable strategy for converting abundant waste coffee grounds into high-performance porous carbon. This method utilizes wet biomass and KOH to enable the intercalation of potassium ions into the biomass components matrix. Through nucleophilic interactions at various reactive oxygen sites, carbon and hydrogen bonds are disrupted, with K + intercalation resulting in organic potassium compounds prior to drying. These potassium compounds facilitate carbonization and in-situ activation in a single-stage thermal process. The optimized carbon sample (2-WCW) had a specific surface area of 1187 m 2 g −1 , abundant ultramicropores, oxygen and nitrogen functionalities. It also displayed high specific capacitance of 351 F g −1 at 5 mV s −1 and 120 F g −1 at 10 A g −1 in 6 M KOH with cycling stability of over 50,000 cycles and 96 % capacitance retention. The assembled device using an organic electrolyte displayed a specific energy and power of 5.6 Wh kg −1 and 5000 W kg −1 respectively, and further exhibited good self-discharge after 100 h. This study offers insights into the importance of the state of the biomass before thermal treatment for tuning its porous structure and surface functionalities for enhanced electrochemical performance in supercapacitors.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haoran Zhang,Hongjiang Li,Xianghong Wang,Shoukun Yu,Lixing Zhao,Enhao Zhao,Se Hyun Kim,Xinlin Li,Chenhao Cong,Yan Wang
With the rapid advancement of flexible electronics in healthcare diagnostics, real-time body temperature monitoring using electronic skin has become increasingly important for assessing and predicting human health status. Currently, most self-charging temperature sensing systems rely on thermoelectric effects, which are limited to transient detection and lack the resolution necessary to track subtle fluctuations in body temperature (e.g., <0.1 °C), thus constraining their practical use in wearable temperature monitoring. In this study, we developed a high-viscosity carbon-based electronic ink based on the synergistic interaction between 1D and 2D materials. Reduced graphene oxide (rGO) and multiwalled carbon nanotubes (MWCNTs) were used as active materials compatible with high-precision dispensing printing technology to fabricate flexible microtemperature sensors and microsupercapacitors (MSCs). The resulting temperature sensor, with a compact feature size, exhibited a high temperature coefficient of resistance (TCR = −1.08%) and fast response time (1.4 s), comparable to that of commercial rigid platinum-based thermometers. The serpentine electrode design and tightly packed internal structure imparted excellent stability under practical conditions, including encapsulation in insulating oil, mechanical deformation during motion, and repeated cycling. Furthermore, leveraging the versatility of printed electronics, we achieved a self-charging temperature sensing system based on the integrated microsupercapacitor. By incorporating IoT technologies and a bluetooth communication module, we realized real-time remote temperature monitoring, providing a promising platform for next-generation electronic skin in wearable wireless health diagnostics.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
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IF 6.2
Qi Zhang,Shuangshuang Bai,Mingwan Liu,Zhuhua Gong,Yun Ren,Wenlin Zhang,Qiang Li,Qinhong Liao,Zexiong Chen,Jianmin Tang
Biomass-derived magnetic biochar is a promising imidacloprid adsorbent because of its low cost, easy separation, and eco-friendly features. This study prepared a novel magnetic Fe 3 C@Fe 3 O 4 core–shell biochar nanocomposite (Fe 3 C@Fe 3 O 4 /BC) using a facile one-step method with Zanthoxylum bungeanum pruning branches as raw materials and K 3 [Fe(C 2 O 4 ) 3 ]•3 H 2 O as the pore-forming agent and Fe source. The prepared Fe 3 C@Fe 3 O 4 /BC had a well-developed porous structure, a considerable specific surface area of 1471.3 m 2 g −1 , good magnetic separation performance, and excellent adsorption performance of imidacloprid. The adsorption capacity of Fe 3 C@Fe 3 O 4 /BC toward imidacloprid reached 288.9 mg g −1 within 1 min, and its maximum adsorption capacity was 557.1 mg g −1 . The adsorption performance of Fe 3 C@Fe 3 O 4 /BC was was stable under extreme environmental conditions, and its regeneration was excellent, which was superior to typical commercial adsorbents. The adsorption mechanism of imidacloprid by Fe 3 C@Fe 3 O 4 /BC involved the comprehensive effects of pore capture, van der Waals forces, hydrogen bonding, electrostatic attraction, and complexation of oxygen-containing functional groups. This work can provide an advanced strategy for the fabrication of high-performance adsorbents from biomass resources for the effective treatment of imidacloprid wastewater.
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Food Bioscience
·
2025
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IF 5.9
En Han,Ming Bao,Yang Li,Xiaoya Dong,Jianrong Cai
Developing simple and rapid methods for the detection of colorant content in foods is essential to mitigate their negative health effects on human. Hence, we constructed a biomimetic enzyme electrochemical sensor to efficiently detect sunset yellow using the nanocomposites of carbon black coated zinc oxide nanoflowers/poly (L-phenylalanine) (CB@ZnO/PLPA). CB was ultrasonically coated onto the surface of ZnO nanoflowers synthesized by two-step wet chemical method, and subsequently combined with PLPA for signal amplification. The synergistic effect of CB@ZnO/PLPA resulted in large electrochemical active area and excellent electrical conductivity. The investigations demonstrated a wide linear range of 0.5–200 μmol/L, a low detection limit of 0.07 μmol/L (S/N = 3) with a sensitivity of 9.272 μA μM −1 cm −2 , by the effective synergy between carbon black @ zinc oxide (CB@ZnO) and poly (L-phenylalanine) (PLPA). CB@ZnO/PLPA sensor showed satisfactory performance for SY detection and its feasibility was verified in real samples detection. In this paper, a simple and efficient electrochemical sensor for SY detection was developed, offering significant potential for widespread application in food analysis.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Pengcheng Yin,Yucheng Yang,Shu Zhang,Zhao Hu,Dawei Li,Feihu Li
The potential of capacitive deionization (CDI) for sustainable desalination depends critically on breakthroughs in electrode materials. Defect-rich titanium (sub) oxides (anatase TiO₂(A), Ti₂O₃, Ti₃O₅, Ti₄O₇) offer compelling advantages, including tunable capacity, low environmental impact, and robustness. This study provides a systematic comparison of their structural features, electrochemical responses, and desalination efficacy. Electrochemical characterization results show anatase TiO₂(A) leads in specific capacitance (252.5 F g −1 at 0.3 A g −1 ), while Ti₃O₅’s highest oxygen vacancy minimizes charge transfer resistance and maximizes ion migration rates. In desalination trials, TiO₂ delivers a maximum salt adsorption capacity of 37.1 mg g −1 (500 mg L −1 NaCl, 1.2 V). All electrodes exhibit outstanding cycling stability (capacity retentions >83.5 %), affirming their practical potential. Correlation analysis discloses the oxygen vacancy-driven charge transfer mechanism inside these electrodes and establishes a structure-performance relationship. Overall, this work establishes fundamental structure-property relationships that underpin future electrode innovation via the oxygen vacancy-engineering strategy, which represents a promising pathway for advancing CDI performance boundaries.
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Small
·
2025
·
IF 12.1
Junyu Lu,Lei Xu,Junjie Shu,Xuan Zhang,Cheng Xie,Yongfen Sun,Yiyao Ren,Changhao Zuo,Zhigang Shen,Shijie Xiao,Lei Li
Graphite-based materials hold significant applications in metallurgy, electronics, nuclear engineering, and new energy technologies, where catalytic graphitization offers a critical route for synthesizing high-purity artificial graphite. This study revealed the atomic-scale mechanisms of iron-catalyzed graphitization through experiment and molecular dynamics simulations: molten iron serves as a carbon transport medium via a dissolution-supersaturation-precipitation process, enabling continuous growth of micrometer-scale graphite through primary graphite crystallization. The microwave-assisted catalytic approach not only achieves a high graphitization degree of 95.12% at 1300 °C, compared to only 87.67% with conventional heating, but also significantly lowers the graphitization initiation temperature to 800 °C. The universality of this method is further demonstrated by its application to carbon fibers, yielding surface graphitization degrees exceeding 93%. This work provides a new technical approach and method for the efficient graphitization transformation of amorphous/microcrystalline carbon materials with broad implications for industrial applications.
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DESALINATION
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2025
·
IF 9.8
Yuqian Zhang,Chengping Li,Ziyi Wang,Zijian Li,Liang Wang,Kuzmin Anton,Xingqiao Wu,Ting Bian
Solar-driven desalination provides a sustainable approach to address global freshwater scarcity, yet its application is significantly hindered by mechanical instability and salt accumulation issues in conventional evaporators. Here, we report a mechanically robust, salt-resistant, and highly efficient three-dimensional hydrogel evaporator (TF/CB@SA/MF-SiO 2 ) that integrates tannic acid-Fe 3+ complexes (TF), carbon black (CB), SiO 2 nanoparticles, and sodium alginate (SA) within a porous melamine foam (MF) scaffold. The CB and TF components provide broadband (>97 %) light absorption from 250 to 2500 nm, while the in situ-formed SA-SiO 2 hydrogel network reinforces the composite structure through strong interfacial bonding, restricting polymer chain mobility and improving compressive strength and elasticity. Under standard one-sun irradiation, the evaporator maintains a high evaporation rate of 2.06 kg m −2 h −1 and demonstrates remarkable long-term stability even under high salinity conditions (up to 20 wt% NaCl). Mechanical testing reveals that the combined CB-SiO 2 reinforcement yields minimal deformation and superior recovery. Practical outdoor tests confirm the evaporator's reliability, yielding freshwater meeting WHO drinking water standards. This multifunctional evaporator demonstrates long-term durability and high salt rejection, providing a viable pathway toward scalable, off-grid desalination and wastewater purification.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Shurui Xu,Jiaer Li,Bingyu Zhu,Xin Tang,Yujian Li,Linjia Wang,Wenbo Liao,Xiaobo Fu,Hang Chen,Junling Tu,Kailai Zhang,Baizeng Fang,Guoyu Zhong
Investigating renewable, eco-friendly, carbon-based materials with superior electrochemical performance is pivotal for advancing the practical implementation of supercapacitors, yet it presents challenges. In this study, a novel MnO@C-HMT-T composite, consisting of porous carbon-encapsulated MnO, was synthesized from a Mn-hexamine coordinated precursor via an in-situ pyrolysis approach. Among the different materials prepared, the MnO@C-HMT-800 stood out. It displayed a mesoporous architecture with a high specific surface area of 1353.1 m 2 g −1 , which facilitates ion transport and energy storage. Additionally, the MnO encapsulated in the carbon layer enables the generation of pesudocapacitance via the redox reaction of Mn 2+ and Mn 3+ . The interaction between the double-layer capacitance of the porous carbon and the pseudocapacitance of the manganese oxides endows the MnO@C-HMT-T composite with superior electrochemical performance. Consequently, the MnO@C-HMT-800 electrode exhibits an impressive specific capacitance of 575.2 F/g at a current density of 1 A/g, demonstrating exceptional stability at 95.6 % after 10,000 cycles. This surpasses the performance of most reported Mn-based materials in the literature. This work presents an innovative and straightforward process for fabricating carbon-encapsulated transition oxides that could be highly valuable in energy storage systems.
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CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Pengfei Zhang,Jialin Bai,Shichao Wang,Min Zhang,Xiumin Yao,Xuejian Liu,Zhengren Huang
SiC/GNPs composites with high thermal conductivity and low resistivity were fabricated with graphene nanoplatelets (GNP) as additive by pressureless solid-state-sintering at 2200 °C. The effects of GNPs content and annealing process on the microstructure and properties of the SiC/GNPs composites were investigated. As the GNPs content increased from 0 to 3 wt%, the flexural strength, thermal conductivity, and resistivity of the SiC/GNPs composites correspondingly decreased. Compared to SiC ceramics without GNPs, the resistivity of the SiC/GNPs composites with 3 wt% GNPs content markedly decreases, from 10 8 to 6.18 × 10 2 Ω cm, while the thermal conductivity slowly drops from 144.2 to 117.8 W/(m·K). Additionally, the influence of annealing atmosphere on the electrical and thermal behavior of the composites was also examined. Annealing under argon resulted in increased thermal conductivity and decreased resistivity. When annealed in a nitrogen, the resistivity of the samples decreases significantly from 618 to 181 Ω cm, while causing only a slight decline in thermal conductivity. These findings highlight the benefits of argon annealing for enhancing the overall electrothermal performance of SiC/GNPs composites.
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Nanomaterials
·
2025
·Vol. 15
·期 17
·1327
·
IF 4.3
Dan Ma,Yudong Zhang,Menghan Liang,Runyu Niu,Yao Ge,Yanan Zou,Xiaorui Dong
The development of efficient non-noble metal catalysts is critical for advancing sustainable fuel-cell technologies. This study investigates the effect of carbon support microstructure on the oxygen reduction reaction (ORR) performance of Fe-N-C catalysts. By precisely tuning the pyrolysis temperature of activated carbon (AC) between 600 and 1000 °C, we elucidate the mechanistic influence of the physicochemical characteristics of the carbon support on the ORR activity of the supported catalyst. Increasing the pyrolysis temperature enhanced the electrical conductivity of the carbon support, thereby improving the ORR performance of the catalyst. However, while the defect density and specific surface area of the carbon support initially increased with increasing pyrolysis temperature, they declined when elevated temperatures were used (e.g., 1000 °C), leading to reduced ORR activity. The AC-900 support, pyrolyzed at 900 °C, exhibited an optimal balance of a high surface area, abundant defects, and superior conductivity. An Fe phthalocyanine/AC-900 catalyst synthesized using the AC-900 support exhibited excellent ORR activity (E1/2: 0.89 V andEon: 0.95 V vs. reversible hydrogen electrode (RHE)) in 0.1 M KOH. This work highlights the pivotal role of carbon support microstructure in governing the ORR activity of the supported catalyst and provides a rational strategy for designing high-performance non-noble metal electrocatalysts.
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Nature Communications
·
2025
·Vol. 16
·期 1
·10229
·
IF 15.7
Li Xu,Huang Jun,Yang Le,Chen Hao-Sen,Song Wei-Li,Jiao Shuqiang,Fang Daining
Improving the reaction kinetics of LiNi 0.8 Mn 0.1 Co 0.1 O 2 is of great importance for realizing batteries with both high energy and power density. The promotion of electrochemical kinetics, i.e. exchange current density of LiNi 0.8 Mn 0.1 Co 0.1 O 2 materials, is a significant strategy. Because there is great variation in exchange current density of different crystal facets, it is critical to fundamentally understand the intrinsic exchange current density of crystal facets for designing high-rate electrode materials. To quantitatively analyze the intrinsic exchange current density of six representative crystal facets on LiNi 0.8 Mn 0.1 Co 0.1 O 2 particles, we develop a quantitative single-particle method based on the combination of the electrochemical impedance spectrum and three-dimensional geometric reconstruction on the single-particle scale. Here we show, compared to the exchange current density of (003) facet of LiNi 0.8 Mn 0.1 Co 0.1 O 2 particles, interestingly, the exchange current density of (201) facet exhibits a 25-fold higher value (~1.50 mA/cm 2 ), which is used to guide the nano-structure design of anisotropic core-shell LiNi 0.8 Mn 0.1 Co 0.1 O 2 particles with improved rate performance (500 cycles) at discharge rate of 10 C (6 min).
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