RARE METALS
·
2023
·Vol. 42
·期 4
·1195-1204
·
IF 8.8
Dong Wei,Zhou Shi-An,Ma Yan,Chi Dian-Jun,Chen Rong,Long Hong-Ming,Chun Tie-Jun,Liu Sheng-Jun,Qian Fu-Ping,Zhang Kui
Designing a heterojunction photocatalyst to improve the separation efficiency of photogenerated electrons and holes is of great significance to improve the hydrogen production efficiency. In this work, we report a rational design to grow ZnIn 2 S 4 on Mo-MOF-derived N-doped C-coated MoO 2 (MOZIS), and it has excellent photocatalytic hydrogen production with triethanolamine (TEOA) as sacrificial agent. N-doped C improves the electron transport efficiency between MoO 2 and ZnIn 2 S 4 . The systematic study shows that MOZIS has good properties to promote the effective separation and transfer of photocatalytic charges, which is attributed to the tight contact interface and good energy band structure between MoO 2 and ZnIn 2 S 4 . The optimized nanocomposites have a high hydrogen production efficiency of 10.89 mmol·g −1 (4 h) under visible light. MOF-derived N-doped C-coated MoO 2 is an effective strategy to improve the photocatalytic hydrogen production efficiency of ZnIn 2 S 4 . Graphical abstract
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xijin Zhao,Xin Kou,Xin Li,Mingjia Li,Ding Xi,Amjad Farid,Hui Huang,Yongpeng Zhao
Herein, multi-layer composite electrodes of MnFe 2 O 4 @carbon nanotubes/carbon cloth (MFO@CNT/CC) are prepared by dip coating and the subsequent hydrothermal method. Flexible conductive carbon cloth (CC) substrate provides a 3D strong base support. The carbon nanotubes (CNT) connected by CC form a conductive network with a large specific area, which is also conducive to electron transfer. The modified MnFe 2 O 4 nanoparticles have abundant active sites, which can enhance the electrochemical activity. CNT and MnFe 2 O 4 nanoparticles form a tandem structure beneficial to increase the active site and promote the response to heavy metal ions. The MFO@CNT/CC electrode has good detection performance for Cd 2+ (0.25–12 ppm) and Pb 2+ (0.25–12 ppm) and a low detection limit of 0.25 ppm. In the presence of interfering ions, it exhibits a highly selective response to the target ion, with minimal current changes and a range of variations (−3.48–5.59 %). The actual detection recovery is in the range of 97.33–101.17 %, suggesting its practical reliability. Furthermore, we propose a detection and analysis method that combines electrochemistry with machine learning; the model attains a perfect classification accuracy of 100 % for both Pb 2+ and Cd 2+ , underscoring the robustness of the classification. Overall, this work provides innovative composites and performance explorations for advancing high-performance simultaneous detection of heavy metal ions.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
He-Qiang Chang,Guo-Hua Zhang,Kuo-Chih Chou
Electrochemical water splitting is considered a sustainable route for the hydrogen industry. In this work, Mo 2 C/MoC heterostructure supported on N -doped carbon (Mo 2 C/MoC@NC) was prepared via a carbonization strategy. For the product (Mo 2 C/MoC@NC-1-2) fabricated with a g-C 3 N 4 / ammonium molybdate tetrahydrate molar ratio of 1:2 at 700 °C under 10%CH 4 /H 2 atmosphere, a high stability and good HER activity with a η 10 of 113 mV in 1M KOH were achieved. To further enhance the catalytic performance of the synthesized Mo 2 C/MoC@NC, the phosphating strategy was proposed for the preparation of Mo 2 C/MoC/MoP heterostructure supported on N-doped carbon (Mo 2 C/MoC/MoP@NC). When the precursor Mo 2 C/MoC@NC-1-2 was phosphated at 650 °C with a heating rate of 5 °C min −1 and kept for 0 min, the as-synthesized Mo 2 C/MoC/MoP@NC-650-0 exhibits good HER catalytic activity with a pretty low η 10 of 78 mV, a j 0 of 0.398 mA cm −2 , and a Tafel slope of 52 mV dec −1 in 1M KOH. This good activity of HER can be ascribed to the N-doped carbon as substrate and the construction of transition metal-based heterostructures.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 10
·4136
·
IF 4.6
Yongwang Ren,Huizhong Xu,Beibei Han,Jing Xu
At present, the selective hydrogenation of α, β-unsaturated aldehydes remains a challenge due to competition between unsaturated functional groups (C=C and C=O). In this study, N-doped carbon deposited on silica-supported nickel Mott–Schottky type catalysts (Ni/SiO2@NxC) was prepared for the selective hydrogenation of cinnamaldehyde (CAL) by using the respective hydrothermal method and high-temperature carbonization method. The prepared optimal Ni/SiO2@N7C catalyst achieved 98.9% conversion and 83.1% selectivity for 3-phenylpropionaldehyde (HCAL) in the selective hydrogenation reaction of CAL. By constructing the Mott–Schottky effect, the electron transfer from metallic Ni to N-doped carbon at their contact interface was promoted, and the electron transfer was demonstrated by XPS and UPS. Experimental results indicated that by modulating the electron density of metallic Ni, the catalytic hydrogenation of C=C bonds was preferentially performed to obtain higher HCAL selectivity. Meanwhile, this work also provides an effective way to design electronically adjustable type catalysts for more selective hydrogenation reactions.Keywords:Ni catalyst;N-doped carbon;electronic effect;cinnamaldehyde hydrogenation
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiaoqing Huang,Wenbiao Zhang,Chaojin Zhou,Lichun Yang,Hui Wang,Qingsheng Gao,Min Zhu
Volume expansion and poor conductivity result in poor cyclability and low rate capability, which are the major challenges of transition-metal oxide as anode materials for sodium-ion batteries (SIBs). Herein, N -doped carbon encapsulated CoMoO 4 (CoMoO 4 @NC) nanorods are developed as excellent anode materials for SIBs with long-cycle life. The N -doped carbon shells serve as buffer to accommodate severe volume changes during sodiation/desodiation, and at the same time improve electronic conductivity and activate surface sites of CoMoO 4 . The optimized composite presents rapid reaction kinetics and excellent cycle stability. Even at a high current density of 1 A g −1 , it still shows long-cycle life and maintains specific capacity of 190 mAh g −1 after 3200 cycles. Furthermore, CoMoO 4 @NC anode is applied to match with Na 3 V 2 (PO 4 ) 3 cathode to assemble full-cells, in which it accomplishes reversible capacity of 152 mAh g −1 after 100 cycles, with capacity retention of 75% at a current density of 1 A g −1 , highlighting the practical application for SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Congyue Sun,Zhongcheng Zhao,Dongyan Xu,Xiaojin Li,Ke Ye
The rapid development of proton-exchange membrane fuel cells needs to develop Pt-based oxygen reduction reaction (ORR) catalysts with activity and stability. In this study, PtCu alloy nanoparticles were in situ anchored on an N-doped porous carbon (NC) derived from ZIF-8 with a chemical reduction method to produce a PtCu/NC catalyst with a Pt loading of 7.96 wt %. The PtCu alloy nanoparticles are uniformly immobilized on the NC with a high surface area via a metal–support interaction. The electrochemical test results demonstrated that the PtCu/NC catalyst displays remarkable activity with an E1/2 value of 0.913 V vs RHE, higher than 0.878 V vs RHE for the commercial Pt/C. The ORR mass activity of the PtCu/NC catalyst is 1.49 and 6.54 times that of PtCu/XC-72 and commercial Pt/C, respectively. The eminent ORR performance of PtCu/NC is attributed to the high specific area of NC and electron-rich Pt sites enhanced by electron transfer from the N and Cu atoms. Moreover, PtCu/NC exhibited better catalytic stability than PtCu/XC-72 and Pt/C after 3000 potential cycles, attributed to the interaction between the N atom and PtCu alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiuxuan Zhang,Hong Jiang,Yefei Liu,Rizhi Chen
ZIF-derived N-doped carbon (CN) materials were modified in this work by TiO 2 nano-islands with oxygen vacancies (O V ) through a sol-gel method and subsequent thermal treatment. By loading Pd nanoparticles (NPs) on CN@TiO 2 , Pd@CN@TiO 2 catalysts were fabricated. Superior catalytic performance of Pd@CN@TiO 2 was found in the selective phenol hydrogenation to cyclohexanone , with a TOF of 30.1 h −1 , 2.2-fold as high as that of Pd@CN. The synergistic effect of CN and TiO 2 nano-islands was responsible for the superior catalytic performance. More O V was generated due to the high specific surface area of CN. At the same time, CN could also enhance the hydrophilicity , and adsorb more phenol in non-planar fashion. The TiO 2 nano-islands with O V could improve the Pd dispersion, make more Pd element on the support surface, strengthen the antioxidizability of Pd and induce electron-rich Pd NPs. Furthermore, the as-fabricated Pd@CN@TiO 2 showed good recyclability in the phenol hydrogenation, and also exhibited excellent catalytic performance in the catalytic hydrogenation of phenol with diverse functional groups. These findings provide the feasibility of using the high-performance catalysts for the hydrogenation of phenol derivatives.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mengyue Zhu,Lei Guo,Zhongyi He,Riadh Marzouki,Renhui Zhang,Elyor Berdimurodov
N -doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.
研究领域:
材料科学
·
电化学
·
防腐蚀研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Lujiang Xu,Qian Yao,Ying Zhang,Yao Fu
Due to the irregular polymeric structure and carbon based inactive property, lignin valorization is very difficult. In this study we proposed a new route for lignin valorization by which aromatic amines can be directly produced from lignin by ex situ catalytic fast pyrolysis with ammonia over zeolite catalysts. Meanwhile, the obtained pyrolytic biochar can be activated to produce high surface area N-doped carbon for electrochemical application. Wheat straw lignin served as feed to optimize the pyrolysis conditions. MCM-41, β-zeolite, HZSM-5, HY, ZnO/HZSM-5, and ZnO/HY were screened, and ZnO/HZSM-5 (2 wt % Zn, Si/Al = 50) showed the optimal reactivity for producing aromatic amines due to the desired pore structure and acidity. Temperature, residence time, and ammonia content in the carrier gas displayed significant effects on the product distribution. The maximum yield of aromatic amines was obtained at moderate temperatures around 600 °C, 0.57 s, and 75% ammonia in the carrier gas. Under the optimized conditions, the total carbon yields of pyrolytic bio-oil and aromatic amines were 9.8% and 5.6%, respectively. The selectivity of aniline in the aromatic amines was up to 87.3%. Moreover, the pyrolysis byproduct, biochar, was further activated by KOH at 800 °C under ammonia atmosphere for producing N-doped carbon with high surface area. The pyrolytic biochar and N-doped carbon were characterized by elemental analysis, SEM, XRD, nitrogen adsorption–desorption, and XPS. Cyclic voltammetry (CV) and galvanostatic charge–discharge were employed to investigate the electrochemical performance of pyrolytic biochar and N-doped carbon. The specific capacitance of N-doped carbon reached about 128.4 F g–1.
研究领域:
生物质能
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guangsheng Dong,Huiying Yu,Lixin Li,Rongyu Zhang,Xu Yang,Kai Zhu,Guiling Wang,Dianxue Cao
MoS 2 is regarded as a hopeful anode candidate for sodium-ion batteries (SIBs) due to their various merits such as high specific capacity, abundant raw material reserves and low cost. However, their practical application is impeded by unsatisfied cycling ability due to the intense mechanical stress and unstable solid electrolyte interphase (SEI) during Na + insertion/extraction process. Herein, spherical MoS 2 @polydopamine derived highly conductive N -doped carbon (NC) shell composites (MoS 2 @NC) are designed and synthesized to promote the cycling stability. The internal MoS 2 core is optimized and restructured from the original micron-sized block to the ultra-fine nanosheets during initial 100–200 cycles, which not only improves the utilization of electrode materials but also shortens the ion transport distance. The outer flexible NC shell effectively maintains the original spherical structure of the overall electrode material and prevents the occurrence of large-scale agglomeration, which is conducive to form a stable SEI layer. Therefore, the core–shell MoS 2 @NC electrode presents a remarkable cyclic stability and a capable rate performance. Under a high rate of 20 A g −1 , the high capacity of 428 mAh g −1 can be acquired after over ultra-long 10,000 cycles without obvious capacity loss. Moreover, the MoS 2 @NC‖Na 3 V 2 (PO 4 ) 3 full-cell assembled by employing commercial Na 3 V 2 (PO 4 ) 3 cathode can achieve a high capacity retention of 91.4% after 250 cycles at 0.4 A g −1 . This work reveals the promising prospect of MoS 2 -based materials as anode of SIBs, and also has some inspirations on the structural design for conversion-type electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yun-qiong Yang,Yuan Zhang,Yang Liu,Feier Lin,Hao Zhang
The construction of tunable white-light-emitting materials has garnered increasing attention in the scientific community. In this study, N-doped carbon dots (N-CDs) were surface-modified with carboxylatopillar[5]arene (CP[5]) using an EDC–NHS coupling reaction to create CCDs. CCDs were then conjugated with rhodamine 6G (R6G) through host–guest interactions to fabricate the CCDs–R6G composites. These composites produced two-color fluorescence emission peaks at 447 and 557 nm when excited by a wavelength of 340 nm. Excitingly, white-light emission (0.28, 0.30) can be readily achieved by varying the R6G concentration. To further explore potential applications, a new detection method for rutin (RT) based on the inner filter effect (IFE) was developed. Experimental results verify the practicality and reliability of the fluorescence sensor based on CCDs–R6G composites for RT detection in real samples.
研究领域:
材料科学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiufen Liao,Congjin Chen,Ruxia Zhou,Quanlong Huang,Qinglong Liang,Zuqiang Huang,Yanjuan Zhang,Huayu Hu,Yanglin Liang
In this study, N-doped carbon dots (N-CDs) synthesized from the main components of plants, including cellulose (N-cCDs), lignin (N-lCDs), and xylose (N-xCDs), were compared. TEM, XRD , FT-IR, and XPS were carried out to characterize their morphology and chemical composition. Results show that the three obtained N-CDs contained N-doped sp 2 and sp 3 hybrid carbon core, which was surrounded by oxygen- and nitrogen-containing functional groups. The three N-CDs exhibited a novel double excitation-one emission phenomenon, and their fluorescence were significantly enhanced by N-doping. Moreover, this study indicated that high lignin-containing biomass is not appropriate for producing CDs by hydrothermal method . Cellulose is conducive to produce CDs, while it needs a relatively high temperature and a long time. Low-molecular carbohydrate-rich biomass and nitrogen-containing biomass is the better carbon source to produce the CDs. Also, this study revealed that N-cCDs and N-xCDs are excellent candidates for fluorescent ink, fabrics identifying, temperature sensing, and Hg 2+ sensing. Due to its poor fluorescence property, N-lCDs is not suitable for fluorescent ink and fabrics identification.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）