JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Min Wang,Dehua Xin,Wei Zhang,Dan Luo,Guoqiang Tan
The optimization of the photogenerated carriers’ relaxation dynamics process is critical for the improvement of photocatalytic performance. Herein, a ternary heterojunction with multilevel charge transfer channels was constructed by coupling plasma Ag, nitrogen vacancies carbon nitride (NVs-CN) and Bi 2 O 2-δ CO 3 . Ag/NVs-CN/Bi 2 O 2-δ CO 3 heterojunction showed the S-scheme mechanism, which not only promoted the interfacial charge transfer, but also enhanced the driving force for redox reactions. The defect states induced by nitrogen vacancies and oxygen vacancies provided an additional energy level platforms for hot electrons relaxation of plasma Ag, resulting in the improved separation efficiency and utilization rate of the high-energy hot carriers. Hence, the prepared Ag/NVs-CN/Bi 2-δ O 2 CO 3 heterojunction exhibited the markedly boosted full-spectrum driven catalytic activity for antibiotics degradation. 80.5% and 83.8% of tetracycline and ciprofloxacin could be mineralized into H 2 O and CO 2 by the optimal heterojunction under visible light irradiation, and the corresponding mineralization efficiencies could reach 81.7% and 81.5% under NIR light irradiation. The proposed multichannel charge transfer mechanism provided a new insight into the design and preparation of high-active full-spectrum responsive heterojunction photocatalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nature Catalysis
·
2023
·
IF 37.8
Sun Kai,Dong Juncai,Sun Hao,Wang Xingdong,Fang Jinjie,Zhuang Zhongbin,Tian Shubo,Sun Xiaoming
Metal-nitrogen-doped carbon (M-N-C) catalysts are promising platinum group metals alternatives for fuel cell cathodes; however, their randomly formed, unpredictable coordinations complicate any structure–property investigation and lead to low active site density. Here we achieve dense and well-defined cobalt sites on the surfaces of Co(CN) 3 microcrystals, which are identified by single-crystal X-ray diffraction and X-ray absorption spectroscopy. In situ infrared spectroscopy and density functional theory calculations elucidate that the high oxygen reduction reaction performance (half-wave potential is 0.90 V versus RHE) of the cubic Co(CN) 3 is due to its tailored coordination environment that optimizes *OH desorption. The cyanide linkage with minimized spacing between cobalt atoms maximizes active sites’ spatial density, which boosts the anion-exchange membrane fuel cell peak power density to 1.67 W cm −2 . The microcrystals with well-defined coordination structures can be used as Co-N-C analogues for their structure–property relationship investigations.
研究领域:
材料科学
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电化学
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催化
·
燃料电池技术
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DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 11
·1-10
·
IF 6.408
Fan Ru,Tian Jinrong,Wang Huili,Wang Xuedong,Zhou Peipei
By employing NH 2 -MIL-88 as a template, we synthesized the intermediate Fe@CN under high-temperature calcination and further fabricated the FeS 2 @CN nanocomposites in the presence of sulfur powder. Under varying temperatures (300–600 °C) and Fe@CN-to-S ratios (1:3–6), FeS 2 @CN 500-5 nanocomposites had the highest peroxidase-mimetic activity. Under optimized conditions (incubation temperature 40 °C; solution pH 4.0 and nanocomposite concentration 10 μg/mL; 652-nm absorption), the Michaelis-Menten constant ( K m ) of FeS 2 @CN was much lower than that of horseradish peroxidase (HRP), therefore demonstrating that it had a higher affinity for both chromogenic substrates than conventional HRP. The limits of detection for H 2 O 2 and glucose were 0.15 and 0.30 μmol/L, respectively, and the recoveries for glucose were 91.8–103% with RSDs <5.2%. The novelty of this study lies in (1) the FeS 2 @CN was confirmed to possess stronger enzyme-mimetic activity than its precursors (NH 2 -MIL-88 and Fe@CN); (2) the enhanced activity resulted from the unsaturated sites of N and S doping and the plentiful defects on the porous carbon surface; and (3) free radical trapping experiments evidenced that •OH played a major role in the catalytic reaction, while h + and •O 2 − simultaneously participated in the catalytic process. These convincing performance metrics lead us to postulate that the FeS 2 @CN-based colorimetric biosensor provides a promising approach for several real-world applications, such as point-of-care diagnosis and workplace health evaluations. Graphical abstract
研究领域:
生物化学
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分析化学
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材料科学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
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IF 14.229
Yong Yang,Zheng Tang,Baojing Zhou,Jinyou Shen,Huichao He,Amjad Ali,Qin Zhong,Yujie Xiong,Chao Gao,Ahmed Alsaedi,Tasawar Hayat,Xiaoyong Wang,Yong Zhou,Zhigang Zou
An absolute metal-free in-plane heterosystem consisting of g-C 3 N 4 as scaffold and embedded half-metallic C(CN) 3 as cocatalysts was conceptually designed for photoconversion of CO 2 . The no-slot joint between half-metallic C(CN) 3 and g-C 3 N 4 through covalent bonding generates a unique two-dimensional, π-conjugated hybrid structure, allowing obstacle-free transferring of the photogenerated electrons in g-C 3 N 4 into C(CN) 3 via an intrinsic driving force. Our theoretical calculations together with the in-situ Fourier transform infrared spectra indicate that the most negative charge distribution and binding energy with CO 2 for C(CN) 3 allow outstanding capture and chemical activation capacity toward CO 2 , and subsequently enable the optimized heterosystem to exhibit highly efficient and selective photocatalytic reduction of CO 2 into CO, 7.8 and 1.9 times those produced with pristine and Pt-modified g-C 3 N 4 , respectively. The no-slot joint of organic half-metal cocatalysts with g-C 3 N 4 may open up new opportunities for metal-free, polymer-based photocatalytic systems for CO 2 conversion and solar fuel generation.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 14
·1-17
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IF 2.8
Liu Ti-Ying,Qu Xing-Hao,Shi Gui-Mei,Yu Di,Wang Xiao-Lei
Magnetic metal/carbon composites derived from metal–organic frameworks (MOFs) are viewed as promising candidates for high-performance microwave absorbers. Despite progress, a persistent challenge remains in expanding the effective absorption bandwidth (EAB) for microwave absorbers based on MOFs. To solve the above problems, in this work, NiFe@CN nanocomposite consisting of nickel–iron alloy nanoparticles (NiFe alloy NPs) embedded into nitrogen-doped carbon nanotubes (NCNTs) were fabricated utilizing a flexible two-step method, including co-precipitation and chemical vapor deposition, where the synthesized precursor NiFe Prussian blue analogs (NiFe-PBA) served as the self-sacrificed template and dicyandiamide (DCDA) served as carbon source. By tailoring the mass ratio of DCDA to NiFe-PBA, the morphology of synthesized NiFe@CN nanocomposites can be precisely controlled to create more tubular structures. These structure features enable NiFe@CN nanocomposites to acquire a synergistic effect of interfacial polarization, defect dipole polarization, conduction loss, eddy current loss, and magnetic resonance, which leads to enhanced dielectric loss, optimized impedance matching, and intense attenuation capability. As a result, the NiFe@CN nanocomposites exhibit excellent microwave absorption performance. At a thickness of 2.04 mm, the minimum reflection loss (RL min ) is − 54.09 dB at 13.41 GHz, and the EAB is 5.78 GHz. This work presents a novel strategy for designing low-cost, lightweight, and broadband frequencies microwave absorbers derived from bimetallic MOFs.
研究领域:
材料科学
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纳米技术
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微波工程
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电磁吸波材料
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
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2022
·Vol. 40
·期 11
·1441-1450
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IF 3.815
Tong Li-Fen,He Liang,Zhan Chen-Hao,Xia Yun-Qing,Liu Xiao-Bo
High-quality film capacitors are widely used in many fields such as new energy vehicles, electronic communications, etc., due to their advantages in wide frequency response and low dielectric loss. The dielectric film is a crucial part of the film capacitor, and its properties have an important impact on the performance and use conditions of the film capacitor. In this work, a novel high-temperature-resistant dielectric film was prepared. Firstly, the Bi 2 S 3 /rGO-CN fillers were prepared by hydrothermal method combined with cyanation treatment, and then added to the poly(arylene ether nitrile) (PEN) matrix to prepare the dielectric film materials (PEN/Bi 2 S 3 /rGO-CN). After high temperature treatment, the fillers Bi 2 S 3 /rGO-CN reacted with the PEN matrix, and the composites materials transformed into a thermosetting hybrid film (PEN-Bi 2 S 3 /rGO) with gel content of 97.88%. The prepared hybrid dielectric films did not decompose significantly before 400 °C, and showed a glass transition temperature ( T g ) of up to 252.4 °C, which could increase the effective use temperature of the materials. Compared with the composite films without heat treatment, they exhibit better mechanical properties, with further improvement in tensile strength and elastic modulus, and a decrease in elongation at break. The dielectric constant of the hybrid films can be up to 6.8 while the dielectric loss is only about 0.02 at 1 kHz. Moreover, the hybrid films showed excellent dielectric stability during temperature changes, and remain relatively stable before 250 °C, which is suitable as a high-temperature-resistant high-dielectric material and is more advantageous for practical applications.
研究领域:
材料科学
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电气工程
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高分子科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 8
·1-13
·
IF 2.4
Wumaer Mailidan,Ai Jiakun,Abdulla Rahima,Akbar Mustafa,Wang Jide
Cobalt-based composites have demonstrated promising catalytic potential for organic pollutant degradation. However, the influence of exposed basal facets on their catalytic activity remains insufficiently explored. In this study, Co@CN, Cu/Co@CN, and Zn/Co@CN composites with preferentially exposed Co(111), Cu(111)/Co(111), and Co(111)/Zn(002) facets, respectively, were synthesized via a facile hydrothermal method. The facet-dependent catalytic performance and reaction mechanisms were systematically investigated through the reduction of 4-nitrophenol (4-NP). Experimental results combined with density functional theory (DFT) calculations revealed that the Co(111) facet was identified as a critical determinant of both catalytic activity and reaction pathways. Furthermore, we also tried to reveal how the preferential growth of co-exposed facets (Cu(111)/Co(111) and Co(111)Zn(002)) modulate catalytic activity and reaction pathways. As a results, the Cu/Co@CN with preferential exposed facet Cu(111)/Co(111) achieved increasing efficiency in reducing 4-NP to 4-aminophenol (4-AP) within 90s, with a pseudo-first-order rate constant (k) of 0.720 min -1 . Revealing that the synergy between Cu(111) and Co(111) exemplifies how crystal facets synergistically influenced to catalytic activity and reaction process. Moreover, the catalysts also showed durability over six cycles. The outcomes of this study provide new insights into comprehensiveness exposed crystal plane dependent activity and the design of efficient transition-metal catalysts using the facet strategy for effective degradation of certain pollutants in wastewater. Graphical
研究领域:
催化
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材料科学
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环境化学
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纳米技术
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表面科学
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化学反应工程
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2026
·
IF 2.8
Li Wenting,Wang Xinting,Liu Sanmei
Co 3 O 4 is a promising electro-oxidation catalyst, which is applicable to the oxygen evolution reaction (OER) and glucose oxidation reaction (GOR). However, its insufficient active sites and poor conductivity severely restrict its practical application. Herein, a Co 3 O 4 /CN electrocatalyst derived from zeolitic imidazolate framework (ZIF)-67/CN was successfully synthesized via a solvent-free strategy for efficient OER and GOR. In electrocatalytic OER, Co 3 O 4 /CN demonstrated superior performance on a glassy carbon (GC) electrode, achieving an overpotential ( η ) of 306 mV at a current density ( j ) of 10 mA cm −2 , which outperformed Co 3 O 4 -ZIF (Co 3 O 4 /CN derived from ZIF-67). Furthermore, the Co 3 O 4 /CN electrocatalyst also exhibited good GOR ability, with high sensitivity of 1021.9 μA mM −1 cm −2 , a low detection limit of 1.8 μM ( S / N = 3), a broad linear range from 2 μM to 2.1 mM, excellent repeatability and reproducibility (relative standard deviation [RSD] < 6%), and long-term stability up to 3 weeks. The enhanced activity may be ascribed to the rich active sites, porous structure, and improved electrical conductivity of Co 3 O 4 /CN. This work provides a feasible strategy for enhancing electrocatalytic activity toward OER and GOR using metal–organic framework (MOF)/CN-based materials.
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DOI
高影响因子
Scientific Reports
·
2026
·
IF 3.9
Zhang Zutao,Xiao Peiyuan,Mei Jinping,Zhang Xinyu,Dai Anni,Wang Lei,Yao Qiufang
Chlorinated pharmaceuticals like diclofenac (DCF) pose persistent environmental risks due to their bioaccumulation and toxicity, necessitating advanced remediation strategies. Herein, an integrated electrochemical system was developed, combining a self-nitrogen-doped carbon nitride (CN)-supported PdNi (CN@PdNi) cathode for electrocatalytic hydrodechlorination (ECH) with a CN anode for oxidative mineralization in a single, sequential process. The CN@PdNi cathode achieved 98.6% ECH efficiency, selectively cleaving C–Cl bonds to mitigate toxicity, which is attributed to its structural merits, including a well-dispersed, albeit partially clustered, nanoparticle distribution, metallic Pd/Ni phases, predominant Pd 0 /Ni 0 states, and enhanced porosity. Subsequent CN anodic oxidation enabled 96.8% total organic carbon (TOC) removal, ensuring near-complete mineralization. Mechanistic studies via Electron paramagnetic resonance (EPR), quenching, LSV, and Tafel slopes revealed atomic hydrogen (*H) generated at Pd 0 sites as the primary reactive species, augmented by electron transfer. The system exhibited robust performance across varied conditions and exceptional stability (< 1% efficiency loss over 11 consecutive cycles). Toxicity assessments showed 3–5 Log 10 unit reductions (ECOSAR) and mung bean germination rates improving from 68.7 to 99.8%. This dual-functional detoxification-mineralization strategy overcomes the limitations of single-step processes and offers a scalable, sustainable solution for efficient remediation of halogenated pollutants.
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产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 1
·213
·
IF 5.3
Jisheng Song,Bingkun Huang,Yinyingjie Xu,Kunjie Yang,Yingfan Li,Yuqi Mu,Lingyu Du,Shan Yun,Litao Kang
Even after decades of development, the widespread application of electrochromic windows (ECW) is still seriously restricted by their high price and inadequate performance associated with structural/fabrication complexity and electrochemical instability. Herein, a simple hybrid electrochromic system based on PFSA (perfluorosulfonic acid)-coated Prussian blue (PB, Fe4III[FeII(CN)6]3) film and Ferricyanide–Ferrocyanide ([Fe(CN)6]4−/[Fe(CN)6]3−)-containing hybrid electrolyte is reported. The PB film and the [Fe(CN)6]4−/[Fe(CN)6]3−couple show near redox potentials well inside the electrochemical window of water, resulting in a low driven voltage (0.4 V for coloring and −0.6 V for bleaching) and a relatively long lifespan (300 cycles with 76.9% transmittance contrast retained). The PFSA layer, as a cation-exchange structure, significantly improves the transmittance modulation amplitude (ΔT: 23.3% vs. 71.9% at a wavelength of 633 nm) and optical memory abilities (ΔTretention: 10.1% vs. 67.0% after 300 s open-circuit rest increases) of the device, by means of preventing the direct contact and charge transfer between the PB film and the [Fe(CN)6]4−/[Fe(CN)6]3−couple. This “hybrid electrolyte + electron barrier layer” design provides an effective way for the construction of simple structured electrochromic devices.Keywords:electrochromic;smart window;Prussian blue;[Fe(CN)6]4−/[Fe(CN)6]3−redox couple;perfluorosulfonic acid ion-exchange membrane
研究领域:
材料科学
·
电化学
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EcoMat
·
2023
·
IF 14.6
Jingjie Shen,Chenhui Yang,Yanli Ma,Mengnan Cao,Zifa Gao,Shuo Wang,Jian Li,Shouxin Liu,Zhijun Chen,Shujun Li
Photothermal devices and thermoelectric cells hold great promise for energy generation but integration of the two remains a considerable challenge in real-life power supply for sensors. Here, a novel photo-thermo-electric hydrogel (PTEH-Interlocking) was constructed by the synthesis of a photothermal layer on a thermoelectric hydrogel with the redox pair Fe(CN) 6 3− /Fe(CN) 6 4− . The smart design of using the oxidation of pyrogallic acid by Fe(CN) 6 3− to construct the photothermal layer for photo-to-heat conversion protected the redox couple of the thermogalvanic ion pair from ultraviolet damage, as well as triggered the formation of an interlocking structure at the interface of the photothermal layer and the thermoelectric hydrogel. The as-prepared PTEH-Interlocking has shown a high Seebeck coefficient and rapid heat transfer, boosting the photo-thermo-electric conversion. As a demonstration of a practical application, the PTEH-Interlocking cells are successfully used as the energy supply for a mechanical sensor.
研究领域:
材料科学
·
能量转换
·
纳米技术
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shouze Li,Zhou Li,Dongyan Xu,Run Hu
Emerging thermocells exhibit a significant potential in low-grade heat harvesting owe to their high mV-scale thermopower, low cost, and high robustness. Fundamentally, three effects contribute to the thermopower enhancement of liquid thermocells, i.e. original concentration effect, solvation effect, and normalized concentration gradient effect. Yet, the contribution of the solvation effects and the normalized concentration gradient in organic solvents remains a subject of debate. In this paper, we integrate experiments, spectral analysis, and electrochemical theory to demonstrate that the normalized concentration gradient dominates the enhancement of thermopower in the investigated organic solvents, whereas the solvation effect is weak. Further, the introduction of ethanol results in a thermosensitive solubility of K 4 Fe(CN) 6 and a minimal concentration at the cold end, which establishes a huge substantial normalized Fe(CN) 6 4- concentration gradient and increases the Seebeck coefficient to 3.4 mV/K. Simultaneously, the precipitation resulting from the introduction of an organic solvent notably diminishes the heat convection within the system. As a result, the optimized TC-35EtOH system yields a ZT value (0.094) and Carnot-relative efficiency (2.52 %) that are 7 times greater than those of its initial counterpart. Additionally, the system’s high power density of 3.64 W/m 2 suggests its potential for harnessing low-grade heat waste energy.
研究领域:
物理化学
·
能源材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）