APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Huimin Tang,Xueai Li,Kexin Jin,Yuning Shi,Chunsheng Wang,Wanchun Guo,Kesong Tian,Yahui Wang,Haiyan Wang
Microwave absorbing materials with lightweight and high-performance are of great significance for electronic technique, ecological environment and defense applications. The hollow structure of carbon microspheres is beneficial to achievement of high-performance microwave absorption due to high interfacial polarization. However, the key characteristic is still unclear to control interfacial polarization. Herein, double-shelled N-doped carbon hollow particles derived from polypyrrole by self-sacrifice template were synthesized. The polymerization process was controlled by the interface between solid and pyrrole acid liquid in Fe 3 O 4 disperse system, subsequently, micro-nano structure of carbon was tuned. The N-doped carbon double-shelled hollow particles (DSHS) show a strong dielectric loss due to coupling effect of resistance loss and interfacial polarization owing to the double-shelled hollow structure. Thus, DSHS shows a high-performance microwave absorption with minimum reflection loss (RL min ) of −75.10 dB at a thickness of 2.48 mm and effective absorption bandwidth (RL ≤ -10 dB) of 6.08 GHz and 4.05 GHz covering the whole Ku band and almost the whole X with a thickness of 2.21 mm and 3.00 mm, respectively. This work provides a simple approach for synthesizing N-doped carbon particles with distinct micro-nano hierarchical structure, double-shelled hollow microspheres assembled by nanoparticles have potential application as a high-performance MAM.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Qikang Huang,Peize Li,Mingkui Wang,Yan Shen
This study reports on determining kinetics of electrochemical reduction CO 2 to CO on Au catalysts using the substrate generation/tip collection (SG/TC) mode of scanning electrochemical microscopy (SECM). We introduced a simple but effective method based on transient technique to obtain a series of apparent heterogeneous rate constants k based on Fick’s second law by controlling the tip-substrate distance and the voltage of the substrate electrode within the SECM framework. By analysis the transient current recorded during the chronoamperometric characterization, we can successfully determine the apparent rate constant k for the simplified total conversion process of CO 2 + 2H + + 2e - → CO + H 2 O onto Au catalyst electrode serving as an example, which increases from 5.02 × 10 –2 cm⋅s −1 to 7.16 × 10 –2 cm⋅s −1 in the low potential range of −2.2 to −2.6 V (vs. Pt/PPy) and decreases to 6.54 × 10 -2 cm⋅s −1 at –2.8 V (vs. Pt/PPy). The method proposed here can be applied to quantitatively analyze the kinetic of CO 2 electrochemical reduction reaction, and thus provide a useful tool to guide the synthesis of catalyst as well as in-situ performance evaluation.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Kai Wang,Quanlu Wang,Guoxiang Tang,Tong Zhang,Wei Li,Tingxi Li,Ying Chen,Haijiao Xie,Yongqin Han
The applications of metal–organic frameworks (MOFs) with intrinsic porous structures are still limited by their low electrical conductivity. Herein, different anthraquinone-based dopants bearing with hydroxyl and sulfonate groups are introduced in situ and anchored on the surface of MOFs to enhance the electrical conductivity during the polymerization of Ni-MOF/polypyrrole (PPy) composites. The doping effect and electrochemical storage mechanism of MOF/PPy composites are investigated using supported experiments and density functional theory. Results show that among the three redox dopants, AQS demonstrates the highest doping level. The specific capacitance of the resulting Ni-MOF/PPy/AQS-12 can reach a high value of 667 F g–1 at the current density of 1 A g–1. The assembled Ni-MOF/PPy/AQS-12//active carbon asymmetric supercapacitor device have energy and power densities of 46.7 W h kg–1 (83.3 μWh cm–2) and 400 W kg–1(800 μW cm–2), excellent cyclic stability with a capacitance of 90.5% retention after 10000 cycles, and flexible stability, offering great potential as a power source for flexible wearable devices.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Zhijie Chen,Ruojun Peng,Yichen Li,He Li,Yi Gao,Yu Wang
In this study, a novel dual-stimuli-responsive phenylboronic acid functionalized metal-organic framework (PCN-222(Fe)@calcein-PVA) was synthesized and characterized by scanning electron microscope, X-ray diffraction and Fourier transform infrared spectroscopy. The prepared PCN-222 (Fe) @ calcein-PVA can release calcein and PCN-222 through phenylboronic acid ester bond cleavage in acidic environments. The former emits green fluorescence for cell imaging, while the latter can generate reactive oxygen species that inhibit tumor cell growth under illumination. 1,3-diphenylisobenzofuran (DPBF) was used to verify that the nanocomposite may produce cytotoxic singlet oxygen under the stimulation of light. The cell experimental results showed that PCN-222 (Fe) @ calcein-PVA had a certain inhibitory effect on the growth of breast cancer cells (MDA-MB-231, MDA-MB-435, MCF-7). The results show that the nanocomposite has excellent pH response and light response, which provides potential applications in precise treatment of breast cancer and cell imaging.
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Nano Energy
·
2024
·
IF 16.8
Hao Zhang,Dongzhi Zhang,Yan Yang,Lina Zhou,Yukun Liu,Wenzhe Liu,Yuehang Sun,Yihong Guo,Yuncheng Ji
As atmospheric issues and energy crises worsen, developing environmentally friendly, low-cost, high-performance self-powered gas sensing systems for gas pollutant monitoring is crucial for the development of ecological civilization. In this work, an eco-friendly self-powered nitrogen dioxide (NO 2 ) sensor (EFNS) system based on an eco-friendly triboelectric nanogenerator (EF-TENG) is reported. The system comprises a power supply unit (EF-TENG) and a sensing unit (In 2 O 3 /PPy sensor), connected through a signal stabilization circuit. EF-TENG utilizes eco-friendly and biodegradable gelatin and PLA/PBAT as the friction layer. By introducing leaf structures on the gelatin surface using a template method , the output voltage and current of EF-TENG were increased by 1.44 and 1.67 times, respectively. The peak power density and root mean square power density of EF-TENG reached 1386 mW m −2 and 185.35 mW m −2 , respectively. Additionally, EF-TENG exhibited excellent long-term stability, maintaining a stable output voltage (∼24 V) after rectification and voltage stabilization treatment under conditions of 15–55°C and 40–80 % RH . Additionally, an In 2 O 3 /PPy heterostructure sensor was prepared, and the EFNS system was constructed through impedance matching effects, revealing the NO 2 response mechanism of the In 2 O 3 /PPy heterostructure . This achieved a wide detection range and highly sensitive (V g /V a = 355 %@30 ppm) detection of NO 2 . This work provides insights into eco-friendly self-powered gas sensors and sensing mechanisms, offering ideas for the development of environmental monitoring sensors and clean energy harvesting devices.
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Surfaces and Interfaces
·
2024
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IF 5.7
Qiyang Guo,Ruixiang Yao,Huili Cheng,Kai Yin,Xiangrong Chen,Yaqing Lu,Ashish Paramane
The strategy of functionalized PS-NPs via PPy (PPy@PS-NPs) forming heterogeneous interface composition is highly efficient in increasing the insulation properties of linear low-density polyethylene (LLDPE). The morphology results show that PPy@PS-NPs are monodispersed in the LLDPE matrix after melting blend, which exhibits unparalleled engineering application value. The electrical insulation results show that PPy@PS-NPs introduced into the LLDPE matrix can reduce its DC electrical conductivity, enhance DC breakdown strength, and inhibit space charge accumulation. When the PPy@PS-NPs concentration is 0.5 wt%, the DC breakdown strength is 35.3 % higher than that of LLDPE. Mechanism research indicates that the depths of carrier traps are decreased due to high electron affinity caused by the introduction of PPy@PS-NPs, but the trap density is increased. The reported strategy of using functionalized polymer nanoparticles to improve the polymer insulation property provides new insights for developing future high-insulation materials and other functional materials based on functionalized polymer nanofillers.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Hui Wang,Xuefeng Zhang,Xiangfeng Wu,Yewei Kang,Yirui Huang,Zhaoye Zhao,Ziyan Li,Tingting Zhou,Junchuan Wang,Wei Zhu,Chengsi Pan
Bimetallic iron-based metal organic frameworks (MFe-MOFs) exhibit promising photocatalytic properties but face challenges typical of pristine MOFs, including low photoresponsive activity, inadequate band gap regulation, and weak photoconductivity. Here, we designed porphyrin-based COFs (TpPAM-COFs) to serve as a shell grown on NH2-Fe-MIL-101 nanoparticles (NPs) using an in situ solvothermal approach. Subsequently, a ligand-anchoring full-range metallization process was applied to introduce hetero metal ions throughout the core–shell composites, establishing a type-II scheme heterojunction (Fe/Cu-M@PC-Cu) via covalent bonding between NH2-Fe/Cu-MIL-101 and Cu-TpPAM-COFs. The Cu-TpPAM-COF shell, with broad light absorption range, enhanced the generation of photogenerated electrons, facilitating the reduction of Cu2+ and Fe3+ within the Fe/Cu-M@PC-Cu heterojunction and promoting the regeneration of Cu+ and Fe2+ Fenton active sites. Moreover, rapid electron transfer between Fe3+ and Cu+ centers amplified the Fe3+/Fe2+ redox cycle, accelerating the catalytic decomposition of H2O2 and increasing ·OH radical production. Additionally, the optimized bandgap structure of Cu-TpPAM-COFs enhanced the oxidation capacity, as evidenced by the Fe/Cu-M@PC-Cu composite achieving exceptional photo-Fenton catalytic efficiency with 92.7% tetracycline hydrochloride (TCH) degradation in 35 minutes, surpassing that of most reported similar catalysts. Furthermore, the composite showed excellent stability, with only an 11.9% loss in photo-Fenton degradation efficiency after 8 cycles, highlighting its great potential for addressing challenging environmental pollutants.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Xiaona Fu,Xu Pan,Qing Wen,Ye Chen,Cunguo Lin,Haiping Gao,Zhenghui Qiu,Liuqingying Yang,Haitao Xu
Microbial fuel cell (MFC) shows potential as an environmentally friendly energy technology, but the low power density restricts their practical applications. In this study, polypyrrole (PPy), carbon nanotubes (CNTs) and MoSe 2 were synthesized into a novel nanocomposite (PPy/MoSe 2 /CNTs) via a straightforward hydrothermal and in situ polymerization approach and served as the anode material of MFC. The charge transfer resistance (R ct ) of the PPy/MoSe 2 /CNTs (4.75 Ω) anode was significantly lower than that of PPy/MoSe 2 (13.75 Ω) anode and MoSe 2 /CNTs (12.36 Ω) anode. Furthermore, the maximum power density of the PPy/MoSe 2 /CNTs-MFC was 4.43 W/m 2 , which was 1.99 times and 1.61 times higher than that of the PPy/MoSe 2 -MFC (2.22 W/m 2 ) and MoSe 2 /CNTs-MFC (2.74 W/m 2 ), respectively. High-throughput sequencing confirmed that PPy/MoSe 2 /CNTs bioanode demonstrated outstanding biocompatibility and the function of screening excellent electrogenic microbes. On the one hand, the good bioelectrocatalytic performance of the PPy/MoSe 2 /CNTs bioanode could be attributed to the abundant pyrrolic nitrogen in PPy, which enhanced the attachment of C-type cytochrome (Omcs) and promoted the direct electron transfer (DET) process between the biofilm and the electrode. In addition, the conductive bridging Mo–N bonds further promoted the direct transfer of electrons in PPy, mediating the long-distance DET process. On the other hand, well-dispersed MoSe 2 not only provided numerous active sites, but also enhanced the Se cycle of microorganisms by affecting their energy metabolism pathways, thereby improving their electricity generation capacity. In addition to the above, the high electrical conductivity of CNTs increased the interfacial charge transfer rate. This study explored the use of molybdenum-based ternary material as anode material to construct high-performance MFC, which provided meaningful information for future practical applications of MFC.
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Inorganic Chemistry Frontiers
·
2024
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IF 6.1
Guiyuan Yang,Fangyuan Hu,Li-Li Cui,Meihong Fan,Xin Ge,Xingquan He,Wei Zhang,Tewodros Asefa
Sustainable electrochemical energy conversion and storage systems are expected to alleviate the energy shortages and environmental crisis that are currently facing the world. To bring the large-scale deployment of these energy systems to reality, the development of highly efficient, sustainable, and stable electrocatalysts is key. In this work, an electrocatalyst composed of homonuclear paired Fe sites coordinated onto N-doped carbon, labelled as Fe2–N–C-900, is reported. The material is synthesized by preparing, and then pyrolyzing at 900 °C, Fe(III)-tetrapyridinylporphyrin-modified zeolitic imidazolate framework-8 (ZIF-8). The electrocatalyst displays excellent activity for the oxygen reduction reaction (ORR), with an onset potential of 0.990 V vs. RHE, a positive half-wave potential of 0.869 V vs. RHE, and a limiting current density of 6.7 mA cm−2, which are all superior to those of the benchmark noble metal-based ORR catalyst Pt/C. This is attributed to its high-density of catalytically active Fe2–N6 sites, large electrochemically active surface area, and small charge transfer resistance. The electrocatalyst also functions well for the ORR on an air electrode in an aqueous zinc–air battery while showing high catalytic activity, remaining stable, and giving a peak power density of 166.3 mW cm−2. Its performance here, too, exceeds that of a Pt/C-based zinc–air battery.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Henan Jia,Pei Su,Jiahang Fan,Taotao Guo,Yiming Zhang,Lingfen Miao,Lei Wan,Penghui Yang,Mao-Cheng Liu
Yolk-shell-structured transition metal sulfides (TMSs)/carbon nanocomposites are highly desirable in advanced energy storage system, such as sodium-ion batteries (SIBs) and supercapacitors (SCs). Nevertheless, practical applications are still prevented by the loose attachment of TMSs with carbon caused by conversion stress, the aggregation of TMSs nanoparticles and the sluggish ion transport caused by high crystallinity of carbon. Here, the disperse hollow Co 9 S 8 nanoparticles encapsulated into N,S-codoped carbon nanotubes (CNTs) with poor crystallinity through Co N C bond was synthesized (CS-NSCNT) to overcome the above obstacles. The designed CS-NSCNT can provide the short diffusion path and prevent the huge volume expansion of conversion reaction. Moreover, the established Co N C bond endows the strong interaction and regulates the electronic structure thus promote the stability and rate performance effectively. The CS-NSCNT SCs’s electrode delivers a high specific capacitance of 1150 F g −1 at 1 A g −1 , with a high cycling life stability and rate performance. For SIBs, the CS-NSCNT cathode demonstrates an initial reversible capacity of 475 mAh g −1 at 0.1 A g −1 and an excellent rate performance with a capacity retention of 53 % at 10 A g −1 . This work may satisfy the long-stability, high-capacitance/capacity, high-power/energy density application requirements of future applications.
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PubMed
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-16
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IF 23.2
Yuan Liying,Zhao Wenxin,Miao Yukun,Wang Chang,Cui Anguo,Tian Zhongning,Wang Ting,Meng Alan,Zhang Meng,Li Zhenjiang
The inadequate impedance matching and weak attenuation capability for incident electromagnetic waves exhibited by carbon fibers (CF) are critical factors limiting their application served as absorbing materials. Constructing a nanocomposite system that simultaneously exhibits both dielectric loss and magnetic loss characteristics is a feasible strategy to overcome these limitations. In the present study, a core-shell CF@PPy@CoFe 2 O 4 nanocomposite is fabricated through electrodeposition and subsequent hydrothermal methods to enhance the attenuation capacity and impedance matching of bare CF. Under the synergistic effects of diverse components and a peculiar network structure, the nanocomposite demonstrates optimized conductive loss and polarization loss, which results in a remarkable electromagnetic wave absorption performance with a minimum reflection loss (RL min ) of -55.33 dB and an effective absorption bandwidth (EAB) of 6.48 GHz (12 ~ 18 GHz) at optimal thicknesses of 2.11 and 2.42 mm, respectively, suggesting its promising application as a candidate absorber. More importantly, the exploration concerning the absorption mechanism provides significant insights into the attenuation modes of the dielectric-magnetic loss hetero-junction, which is beneficial for developing similar absorbing materials. Graphical abstract
CF@PPyCoFe 2 O 4 nanocomposite displays an efficient electromagnetic wave absorption capacity by virtue of its excellent conductive loss and polarization loss.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Rongcong Li,Liu Yang,Ruizhi Li,Yingke Zhou
Carbon modified nitrogen-doped Fe 3 O 4 (N–Fe 3 O 4 @C) nanorod array directly grown on carbon cloth was fabricated. Nitrogen-doping and carbon shell effectively decrease the potential barrier of ion migration of the oxides and improve the electrochemical performance. An enhanced donor density of N-Fe 2 O 3 (7.6 × 10 15 cm −3 ) is achieved with optimized doping temperature. Following with carbon coated, the optimized N–Fe 3 O 4 @C electrode showed ultrahigh capacitance over an extended potential window and remarkable cycling performance. A new quasi-solid-state supercapacitor with N–Fe 3 O 4 @C and NiCoP@Ni(OH) 2 achieved high voltage to 2.0 V and high energy density (72.37 Wh kg −1 , 2.36 mWh cm −3 ).
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危险品化学品经营许可证（带存储）