Catalysis Science & Technology
·
2022
·Vol. 12
·期 20
·6285-6293
·
IF 6.177
Jie Lian,Qiang Bai,Jinyu Zhao,Xiaomin Wang
It is a grand challenge to develop non-noble metal-based oxygen reduction (ORR) catalysts with relatively high activity and stability for proton exchange membrane fuel cells (PEMFCs). Herein, zeolitic imidazolate framework (ZIF) precursors were grown in situ on graphene oxide (GO), and Co-N-RGO catalysts with good stability were successfully prepared. Density functional theory (DFT) calculation results show that Zn and Co are mixed and alternated to form a Zn-Co-ZIF structure instead of forming ZIF-8 or ZIF-67, separately. Such a combination promoted the uniform distribution of Co atoms in the N-doped carbon frameworks during subsequent heat treatment. By means of accurate adjustment of the molar ratio of Co/Zn species in the Zn-Co-ZIF precursors, the hierarchical porous structure connected with uniformly dispersed Co–Nx sites was established after thermal activation, and the utilization rate of active sites was improved. The RGO in catalysts, connecting each derivative carbon particle, formed a connected network and reduced the ohmic impedance of the catalyst layer. This strategy avoided the traditional tedious steps of additional acid-leaching and second heat treatments. What's more, the ORR performance of the Co-N-RGO samples was evaluated. The catalyst exhibited a positive half-wave potential (0.75 V vs. RHE), high limiting diffusion current density, and positive stability at 0.5 M H2SO4. Meanwhile, the H2/O2 fuel cell test result displayed a relatively high ORR activity with a peak power density of 334 mW cm−2.
研究领域:
能源材料
·
电化学
·
纳米材料
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催化化学
·
燃料电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Hongqiang Shen,Jixiang Wang,Jinhui Jiang,Bifu Luo,Baodong Mao,Weidong Shi
A series of RGO-Cu 2 O/Bi 2 O 3 composite photocatalysts was developed by depositing Cu 2 O and Bi 2 O 3 nanocrystals on the surface of RGO via an in situ precipitation method. The Cu 2 O and Bi 2 O 3 nanocrystals distributed uniformly and separately on RGO, which favored the transfer of photogenerated electrons and holes towards an effective path. Compared with RGO-Cu 2 O and RGO-Bi 2 O 3 , the three-component RGO-Cu 2 O/Bi 2 O 3 composites presented a further improvement on the photodegradation of tetracycline (TC) under visible light irradiation, which can be attributed to the construction of a Z-scheme photocatalytic system where the RGO served as a solid-state medium for the transfer of the photogenerated electrons from the conduction band of Bi 2 O 3 to the valence band of Cu 2 O.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Yong-song Tan,Weiyi Han,You Wu,Dajiang Kuang,Liyang Song,Chaoxia Wang
The development of wearable gesture recognition systems, capable of converting intricate human gestures into electric signals and graphical representations , poses significant challenges for future advancements in health monitoring and human-machine interfaces. In response to this demand, we present an approach centered on a cell-inspired, multiscale hierarchical structural piezoresistive pressure sensor designed for gesture recognition applications. The breathable, hierarchically interlocked textile pressure sensor (PFPA), featuring a SWCNTs/polyvinylpyrrolidone (PVP)/reduced graphene oxide (rGO) dendritic structure combined with a PANI/PVA cylindrical array, exhibits remarkable properties. The dendritic electrodes, composed of SWCNTs and PVP in a 1:2 ratio, maintain optimal regularity. Meanwhile, the cylindrical PANI/PVA array is meticulously engineered with a radius of 200 μm, a height of 200 μm, and an inter-cylindrical spacing of 150 μm. The PFPA demonstrates an unprecedented ultrahigh sensitivity of 80.8 kPa −1 across a pressure range of 0–5 kPa, coupled with a rapid response time of 150 ms and minimal hysteresis of 16.1 %. The PFPA also demonstrates outstanding repeatability, with no significant performance degradation observed after 4000 cycles. By correlating the bending angles of finger joints with resistance changes, we successfully integrated these sensors into a glove, enabling precise gesture recognition. The multilayer SWCNTs/PVP/rGO dendritic and PANI/PVA cylindrical array pressure sensor exhibits superior sensing performance and accurate posture capture. This demonstrates its significant potential for applications in wearable electronics and intelligent devices, marking a substantial advancement in the field.
研究领域:
材料科学
·
生物医学工程
·
可穿戴设备
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yang Yang,Zheng Xiu,Fei Pan,Hongsheng Liang,Haojie Jiang,Hongtao Guo,Xiao Wang,Lixin Li,Bin Yuan,Wei Lu
Hierarchical microarchitecture engineering is a state-of-the-art approach to designing aerogel electromagnetic (EM) wave absorbers, offering huge potential in improving EM energy dissipation. However, the intrinsic feedback mechanism regarding the specific influence of each microarchitecture parameter on EM properties is not comprehensively revealed, making it challenging to fully utilize the potential of aerogels to achieve superior EM wave absorption performance. Herein, a range of MXene/rGO-based aerogels with multilevel hierarchical configurations are fabricated by a magnetic field-guided strategy. Leveraging growth thermodynamics effects under a magnetic field and bridging effect between adjacent rGO units, three hierarchical microarchitecture models (lamellae ordering, interlayer spacing, and layer thickness) are constructed in aerogels. Remarkably, three models progressively improve reflection loss ( RL ), effective absorption bandwidth (EAB), and matching thickness by enhancing dielectric loss, decoupling attenuation-impedance matching, and adjusting power loss density, respectively. Consequently, the MXene/rGO-based aerogels exhibit stepwise enhancement in EM wave performance, achieving a superior RL of −64.6 dB and a broad EAB of 7.0 GHz at 1.8 mm thickness, surpassing alternative aerogels with other configurations. This work elucidates the effect of multilevel hierarchical microarchitecture on the synergistic multi-effect dissipation mechanism of EM waves in aerogels, providing insights for designing advanced EM absorbers through diverse strategies.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Shuo Duan,Yuming Huang
A novel electrochemical sensor was developed for the sensitive and selective detection of Cu 2 + , Pb 2 + and Cd 2 + , which was based on NH 2 -MIL-88(Fe)-rGO composite modified glass carbon electrode (NH 2 -MIL-88(Fe)-rGO/GCE). The NH 2 -MIL-88(Fe)-rGO composite was facilely prepared by a one-step method and characterized by SEM, XRD, Raman spectrum and electrochemical methods. The stepwise GCE modified process was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of Cu 2 + , Pb 2 + and Cd 2 + ions on the NH 2 -MIL-88(Fe)-rGO/GCE were explored by differential pulse anodic stripping voltammetry (DPASV). It was found that NH 2 -MIL-88(Fe)-rGO was capable of adsorbing Cu 2 + , Pb 2 + and Cd 2 + ions from aqueous solutions and the NH 2 -MIL-88(Fe)-rGO/GCE could enhance the electrochemical responses of Cu 2 + , Pb 2 + and Cd 2 + effectively. Important operational parameters such as electrolyte pH and deposition time were investigated and optimized for the determination of trace Cu 2 + , Pb 2 + and Cd 2 + ions. Under the optimum conditions, the proposed electrochemical sensor had a linear range of 0.005––0.3 μM for Cd 2 + , 0.01–0.3 μM for Pb 2 + and 0.005–0.05 μM for Cu 2 + , respectively. The limits of detection (LODs) are 4.9 nM for Cd 2 + , 10 nM for Pb 2 + and 3.6 nM for Cu 2 + , respectively. The proposed method has been successfully applied to determine three metal ions in water samples. The developed sensor promises simple preparation, fast operation, good sensitivity and excellent reusability, showing great potential for monitoring of water quality.
研究领域:
分析化学
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 3
·2088-2101
·
IF 3.9
Yanling Lv,Shixiang Lu,Wenguo Xu,Yulin Xin,Xiaoyan Wang,Shasha Wang,Jiaan Yu
Novel 2D material-based supercapacitors are promising candidates for energy applications due to their distinctive physical, chemical, and electrochemical properties. In this study, a dandelion-like structure material comprised of Sm2O3, Co3O4, and 2D reduced graphene oxide (rGO) on nickel foam (NF) was synthesised using a hydrothermal method followed by subsequent annealing treatment. This dandelion composite grows further through the tremella-like structure of Sm2O3 and Co3O4, which facilitates the diffusion of ions and prevents structural collapse during charging and discharging. A substantial number of active sites are generated during redox reactions by the unique surface morphology of the Sm2O3/Co3O4/rGO/NF composite (SCGN). The maximum specific capacity the SCGN material achieves is 3448 F g−1 for 1 A g−1 in a 6 mol L−1 KOH solution. Benefiting from its morphological structure, the prepared composite (SCGN) exhibits a high cyclability of 93.2% over 3000 charge–discharge cycles at 10 A g−1 and a coulombic efficiency of 97.4%. Additionally, the assembled SCGN//SCGN symmetric supercapacitors deliver a high energy density of 64 W h kg−1 with a power density of 300 W kg−1, which increases to an outstanding power density of 12 000 W kg−1 at 28.7 W h kg−1 and long cycle stability (80.9% capacitance retention after 30 000 cycles). These results suggest that the manufactured SCGN electrodes could be viable active electrode materials for electrochemical supercapacitors.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xiling Mao,Hao Liu,Jianhua Xu,Mengwei Li,Wenyao Yang
The rational surface reconstruction of component heterointerfaces is an effective strategy for boosting the electrochemical activity and structural stability of asymmetric supercapacitors. In this study, a Co 3 O 4 /rGO (cobalt oxide/reduced graphene oxide(rGO)) heterostructure was designed using a hydrothermal and annealing strategy. Owing to its abundant electroactive sites, accelerated diffusion reaction kinetics, and strong OH − adsorption capability, the optimized Co 3 O 4 /rGO composite delivered an ultrahigh capacitance of 273.3 F/g at 1 A/g. Additionally, density functional theory (DFT) calculations verified the significant charge transfer from Co 3 O 4 to rGO near the heterointerface, achieving obvious charge redistribution and the formation of a space-charge layer. This optimization enhances significantly optimizes OH − adsorption and diffusion and improves electrical conductivity, leading to the excellent electrochemical performance of the surface-reconstructed Co 3 O 4 /rGO. More importantly, the all-solid-state asymmetric supercapacitor Co 3 O 4 /rGO//AC (activated carbon) demonstrated an exceptional energy density of 16.47 Wh/kg at a power density of 599 W/kg, along with excellent cycling stability, retaining 91.0 % capacitance after 5000 cycles. Overall, this study provides an effective approach for designing surface-reconstructed heterointerfaces to achieve remarkable electrochemical performance and ensure structural integrity, showcasing significant potential for practical applications in the energy storage market.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xuesheng Liu,Xueli Li,Xuewei Liu,Sisi He,Junsu Jin,Hong Meng
To improve the photocatalytic performance of ZnO nanoparticles , based on the collective effect as electron sink of Ag and perfect two-dimensional (2-D) feature of graphene, Ag-ZnO-rGO nanoparticles were prepared by polyvinyl alcohol assisted freeze-drying and subsequent hydrothermal reduction method. Through photocatalytic degradation of methyl orange solution under UV irradiation , all as-prepared samples were assessed and compared with those of published works. The surface morphology , microstructure and optical property of materials were systematically studied by XRD , XPS , SEM , TEM and DRS , respectively. XPS and Raman spectra results confirmed that GO has successfully been reduced to rGO; SEM and TEM characterizations manifested that Ag-ZnO NPs were uniformly distributed in rGO with two-dimensional sheets structure; DRS characterization and Kubelka-Munk formula calculation illustrated that Ag-ZnO-rGO exhibited the smallest band gap and the best optical absorption performance. Moreover, the photocatalytic degradation results indicated that Ag-ZnO-rGO NPs combine the advantages of graphene and Ag which not only has significant adsorption but also maintains high photoreactivity.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xue Qi,Hongmin Gao,Lei Wu,Yang Zhou,Hehua Zhang,Dong Chang,Hongzhi Pan
Accurate and sensitive detection of the neurotransmitter dopamine (DA) plays a significant role in medical diagnosis and human health assessment. Herein, an electrochemical sensing platform for ultrasensitive determination of DA was constructed based on porous Co 3 O 4 nanocubes anchored to three-dimensional Ti 3 C 2 MXene-reduced graphene oxide aerogel (Co 3 O 4 /3D MX-rGO). The 3D MX-rGO aerogel with a high specific surface prevents aggregation of Co 3 O 4 nanocubes and exposes more active sites, resulting in excellent electrocatalytic activity and outstanding sensing properties. The electrochemical reaction kinetic was investigated in detail, a possible sensing mechanism was proposed, and the interaction mechanism between the composites and DA was revealed combined with density functional theory (DFT) calculations. Under optimized experimental conditions, the sensor developed using Co 3 O 4 /3D MX-rGO modified glassy carbon electrodes (GCE) exhibited low detection limits (40 nM) in the range of 0.1–300 μM for DA with good selectivity, reproducibility, and stability. The sensor has been successfully use to detect DA in human serum and urine samples with recoveries of 95.3 %-103.7 %, which has great potential for practical applications.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Zhiwei Zhou,Junyan Chen,Haikuan Yu,Yuantian Zhao,Xing Li,Jiawei Ren
Secondary effluent organic matter (EfOM) significantly contributes to membrane fouling in ultrafiltration (UF) systems, which limits their broader use in municipal wastewater recycle. A modified ceramic ultrafiltration membrane (MCUM) was synthesized via vacuum filtration and thermal treatment and then activated under ultraviolet (UV) irradiation. The results indicated that the MCUM-2.88 exhibited the most excellent removal of EfOM, effectively retained high molecular weight (MW) proteinaceous substances, and converted medium MW humic-like compounds into lower MW derivatives. Through parallel factor analysis in conjunction with the self-organizing map algorithm, it was observed that the MCUM primarily degraded aromatic, high MW fluorescent components, while tryptophan-like substances remained as dominant residues due to their resistance to photodegradation. Additionally, the improved surface roughness and hydrophilicity of the MCUM facilitated fouling mitigation by strengthening interfacial repulsion, which diminished foulant adhesion. The fouling mechanism transitioned from complete and intermediate blocking to predominantly intermediate blocking, accompanied by a reduction in gel layer fouling. Consequently, the reversible fouling resistance of the MCUM was reduced by 76.8 %, and the irreversible resistance by 34.3 %, markedly enhancing antifouling performance. The results underscore the effectiveness of MCUM in advanced municipal wastewater treatment, showcasing enhanced antifouling performance and strong potential for sustainable water reuse applications.
研究领域:
环境工程
·
膜科学
·
水处理
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-9
·
IF 5.705
Wang Yanying,Yang Li,Liu Yaqin,Zhao Qingbiao,Ding Fang,Zou Ping,Rao Hanbing,Wang Xianxiang
A composite consisting of NiCo 2 S 4 and reduced graphene oxide (rGO) was prepared via a hydrothermal process. Compared to individual NiCo 2 S 4 nanomaterials or reduced graphene oxide, the composite exhibits enhanced oxidase-like activity. It is found that dopamine (DA) inhibits the ability of NiCo 2 S 4 -rGO to oxidize the substrate 3,3′,5′,5′-tetramethylbenzidine (TMB) to form blue colored ox-TMB. Based on these findings, a colorimetric method for determination of DA was worked out. The absorption, best measured at 652 nm, increases linearly in the 0.5–100 μM DA concentration range, and the limit of detection is 0.42 μM. This method was successfully applied to the detection of DA in spiked human serum samples.
A hierarchical NiCo 2 S 4 -rGO composite was prepared through two-step hydrothermal process. It exhibits enhanced oxidase-like activity which, however, is inhibited by dopamine (DA). Hence, less blue colored ox-TMB is formed by oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of dopamine.
研究领域:
材料科学
·
分析化学
·
生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jiaxin Liu,Mingdi Pan,Jiuzeng Jin,Yunshu Lu,Zhongmin Feng,Ting Sun
17β-E2 was the most active sterol estrogen and was widely used in animal husbandry for animal fattening and increasing milk production. Its abuse has resulted in residues in the environment. However, even very low concentrations could still enter the human body through the enrichment of the food chain and have adverse effects on the endocrine system. The SERS analysis method was employed in this work for the trace detection of 17β-E2 in environmental water. Cheap Ag NPs were selected as SERS sources. MoS2 provided a platform for the orderly arrangement of Ag NPs while making the material self-cleaning. rGO was coated in the outermost layer and had a protective effect on Ag NPs and could avoid oxidation during storage and use. At the same time, the target molecule could be adsorbed to reduce the distance between itself and Ag NPs, thus enhancing the SERS signal. The material had a high SERS enhancement factor (EF = 1.95 × 107), low detection limit (LOD = 5 × 10–12 M), good linear relationship (R2 = 0.994), good stability (RSD = 4.74%), and strong anti-interference ability. The recovery of 17β-E2 in farm wastewater samples was 100.15–108.00% and RSDs were 1.09–2.57%.
研究领域:
环境科学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）