Advanced Materials Interfaces
·
2022
·Vol. 9
·期 30
·2201330
·
IF 6.389
Yaping Wang,Meiyang Liu,Yi Zhang,Qingfeng Yi,Ruowei Yi
Herein, a combined method for planetary ball milling and pyrolysis of g-C 3 N 4 /cobalt phthalocyanine mixture to synthesize Co nanoparticles loaded on C N nanosheets ( g -C 3 N 4 @CoPc- x with different mass ratios x of g-C 3 N 4 :CoPc) is proposed. The synthesized catalysts exhibit a unique 3D open sheet-like structure, and the average size of Co particles is 4.45 nm while encouragingly, a small amount of quasi single-atom cobalt (mean particle size 0.5 nm) is also found in the samples. In addition, the mass ratio of g-C 3 N 4 to CoPc presents a significant effect on ORR activity of the samples. Among the samples, g-C 3 N 4 @CoPc-3 shows excellent ORR performance with the onset potential of 0.94 V in neutral condition and the half-wave potential of 1.00 V in alkaline condition, both better than Pt/C. Its onset potentials in acidic (0.83 V) and alkaline (1.07 V) conditions are also comparable to Pt/C. In a full pH range (acidic, alkaline, and neutral) electrolyte, the prepared samples catalyze ORR via a direct four-electron reaction pathway, and the C 3 N 4 @CoPc-3 reveals high catalytic stability and high anti-alcohol tolerance. Results provide wide feasibility for the synthesis and application of g-C 3 N 4 @CoPc-3 in fuel cells.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenpeng Liu,Zhe Chen,Jun Bu,Wenxiu Ma,Lei Zhang,Hong Zhong,Lin Cheng,Shuangming Li,Tao Wang,Jian Zhang
Compared to their booming thermocatalytic counterparts, electrocatalytic acetylene semihydrogenation still remain stagnant owing to its low activity and poor selectivity. Here, we first explore metal phthalocyanines (M(Pc)s) featuring a defined metal coordination environment as electrocatalysts for acetylene semihydrogenation. Consequently, CoPc exhibits an ethylene current density of 150.8 mA cm −2 and a ∼ 96% ethylene faradaic efficiency under a pure acetylene stream. In-situ electrochemical Raman and theoretical calculations demonstrate that CoPc favors acetylene absorption/hydrogenation processes. Even for crude ethylene containing 1 × 10 4 ppm acetylene, CoPc manifests a ∼ 99.5% acetylene conversion, a high turnover frequency of 4.86 × 10 –3 s −1 and a large space velocity of 2.4 × 10 5 ml·g cat –1 ·h −1 , outperforming those for reported thermocatalysts. This work facilitates the development of electrocatalytic acetylene semihydrogenation and promises alternatives to traditional thermocatalytic processes.
研究领域:
化学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FlatChem
·
2022
·
IF 5.829
Zezhong Zhang,Dong Sun,Rumeng Feng,Shengkai Yang,Kelei Zhuo
Aqueous phase exfoliation (APE) has become a promising method of the graphene preparation. However, it still has some disadvantages, such as low yield and the influence of residual stabilizer on its application. Herein we report a method of the graphene preparation via APE of graphite assisted by sulfonated cobalt phthalocyanine (CoPcS) as the stabilizer. A high yield of graphene can be obtained at low concentration of CoPcS. The yield was 3.2 % in single exploitation, and the total yield reached to 7.3 % after three cycles of exfoliation. The sizes of the prepared graphene sheets were in micron level, and the percentage of few-layer graphene (<5) reached 93 %. The π-π interaction of graphene with CoPcS, as well as the repulsive interaction between negatively charged CoPcS ions, played a crucial role in stabilizing the graphene dispersion. The as-exfoliated graphene powder served directly as a filler in the epoxy coating on the surface of aluminum to improve the protection performance of the coating. A simple, cost-effective, and potential avenue has been provided to product and utilize high-quality graphene materials.
研究领域:
材料科学
·
化学工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2022
·Vol. 10
·期 2
·83
·
IF 4.229
Wenqing Shao,Jiayu Mai,Zhenbo Wei
In this study, a novel cobalt polyphthalocyanine/carboxylic acid functionalized multiwalled carbon nanotube nanocomposite (CoPPc/MWCNTs-COOH) to detect lactic acid was successfully fabricated. The nanocomposite was systematically characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, ultraviolet–visible absorption spectroscopy, and X-ray photoelectron spectroscopy. The nanocomposite provided excellent conductivity for effective charge transfer and avoided the agglomeration of MWCNTs-COOH. The electrochemical surface area, diffusion coefficient and electron transfer resistance of the CoPPc/MWCNTs-COOH glassy carbon electrode (CoPPc/MWCNTs-COOH/GCE) were calculated asA= 0.49 cm2,D= 9.22 × 10−5cm2/s, andRct= 200 Ω, respectively. The lactic acid sensing performance of the CoPPc/MWCNTs-COOH was evaluated using cyclic voltammetry in 0.1 M PBS (pH 4). The results demonstrated that the novel electrode exhibited excellent electrochemical performance toward lactic acid reduction over a wide concentration range (10 to 240 μM), with a low detection limit (2 μM (S/N = 3)), and a reasonable selectivity against various interferents (ascorbic acid, uric acid, dopamine, sodium chloride, glucose, and hydrogen peroxide). Additionally, the electrode was also successfully applied to quantify lactic acid in rice wine samples, showing great promise for rapid monitoring applications.Keywords:nanocomposites;lactic acid;cobalt phthalocyanine;carbon nanotube;nonenzyme
研究领域:
生物化学
·
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 21
·4994
·
IF 4.2
Fan Ma,Hong-Wei Lin,Zizi Li,Wen-Jing Li,Jia-Wei Wang,Gangfeng Ouyang
Noble-metal-free CO2reduction systems based on cobalt phthalocyanine (CoPc) and its derivatives have demonstrated remarkable photocatalytic performances; however, their structure-activity relationship with electronic tuning remains unexplored. Herein, we now provide a systematic study to investigate the electron effects of substituents on theCoPcfamily in photocatalytic CO2reduction, where a Cu(I) heteroleptic photosensitizer is utilized. The highest performance can be achieved using cobalt tetracarboxylphthalocyanine in light-driven CO2-to-CO reduction, with a maximum turnover number of 2950 at 450 nm and an outstanding apparent quantum yield of 63.5% at 425 nm, over ten times the activity with the tetra-dimethylamino-substitutedCoPcderivative. The favorable electron-withdrawing effects have been further verified by DFT calculations and cyclic voltammetry, which reduces the overpotential required for CO2reduction and decreases the Gibbs free energy of the catalyst active intermediates, particularly the CO-desorption energetics.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yifan Zhang,Shilong Liu,Yemiao Gao,Lili Meng,Jiajia Huang
The shuttle of iodine species is considered the obstacle to the application of aqueous zinc iodine (Zn-I 2 ) batteries. Although cathode hosts with electrostatic adsorption to iodine species have been developed to suppress the shuttle effect of polyiodide, the strong interaction between polyiodide and hosts significantly slow down the kinetics of oxidation–reduction of iodine species. Here, a host with strong constraint and catalytic effects on iodine species based on strong base ion exchange resin is established, while the interaction and catalytic performance of hosts on iodine species is regulated by adjusting the functional group structure and the loading amount of quaternary ammonium cobalt phthalocyanine (QACoPc). UV–vis spectroscopy and electrochemical characterization confirm that the iodine host suppresses the shuttle of polyiodide. Moreover, the kinetic analyses reveal that the introduction of QACoPc into host improves the redox kinetic process of iodine species. Consequently, the polymer-based Zn-I 2 battery exhibits stable cycling ability (98.9 % retention rate after 2000 cycles at the current density of 10 C, 1 C: 160 mAh g −1 ) and excellent rate performance (150.6 mAh g −1 at 1 C and 105.9 mAh g −1 at 50 C) due to the strong constraint and catalytic effects of host on iodine species.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Shanshan Zeng,Fucong Lyu,Ligang Sun,Yawen Zhan,Fei-Xiang Ma,Jian Lu,Yang Yang Li
In this work, UiO-66-based metal–organic frameworks are investigated as an oxygen reduction reaction (ORR) catalyst for the first time. UiO-66-NO2 is solvothermally grown on the surface of cobalt phthalocyanine-anchored carbon nanotube (CoCNT) surface, serving as an oxygen “pump” to accelerate the oxygen reduction reaction (ORR). The UiO-66-NO2-attached CoCNT (UiO-66-NO2@CoCNT) exhibits superior electrochemical catalytic properties, exceeding the state-of-the-art commercial 20% Pt/C catalyst with more positive half-wave potential (15 mV difference, at 1600 rpm), better stability (no significant degradation for UiO-66-NO2@CoCNT vs 19% degradation for 20% Pt/C after 25 000 s), and higher methanol tolerance. When assembled in a flexible zinc–air battery, the UiO-66-NO2@CoCNT remains a competitive alternative to commercial 20% Pt/C catalyst with comparable power density and excellent flexibility, suggesting its potential in wearable electronic devices. The outstanding performance of UiO-66-NO2@CoCNT composite is closely related to the synergetic effect among the three components: CNT as a conductive backbone, cobalt phthalocyanines as the oxygen reduction catalytic active site, and UiO-66-NO2 as an ideal oxygen adsorption pump (the oxygen diffusion rate is 4.8 times that of 20% Pt/C and 17.7 times that of CoCNT). The synergy between the three components facilitates oxygen adsorption, transfer of adsorbed oxygen molecules, oxygen reduction, and electron conduction.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 24
·13568-13578
·
IF 4.22
Long Fangchao,Zhou Jian,Hu Liang,Zhang Suyun,Qi Lu,Lu Yangfan,Liang Huawei,Li Lingwei,Zeng Yu-Jia
Two-dimensional (2D) magnets have been the recent research focus due to their potential to meet requirements of continuous miniaturization of spintronic devices. However, very few intrinsic 2D ferromagnetic materials, in particular room-temperature magnets, have been demonstrated because of spin fluctuations and disturbed superexchange caused by the dimensional reduction. Herein, a synchronous ultrasonic exfoliation and doping method is proposed to fabricate ferromagnetic 2D black phosphorus (BP) through the adsorption of phthalocyanine cobalt (CoPc). The electron transfer from BP to CoPc is confirmed by X-ray photoelectron spectroscopy, which is believed to be responsible for the ferromagnetic ground state in as-doped BP (Co-BP) with a saturation magnetization of 0.18 emu g −1 . The density functional theory calculations well-support the charge transfer and the origin of ferromagnetism in Co-BP. In addition, the electron transfer results in the restricted activity of lone pair electrons, which might improve the antioxidant capacity of BP. Our study shed light on room-temperature ferromagnetism in 2D materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 10
·期 1
·2200738
·
IF 6.389
Bo Wu,Minzhang Li,Rajendran Ramachandran,Gaoqiang Niu,Mingxiang Zhang,Changhui Zhao,Zongxiang Xu,Fei Wang
Dopamine (DA) and uric acid (UA) are biomolecules of great consideration that coexist in human body. It is essential and challenging to detect them simultaneously with high sensitivity. This paper reports a novel electrochemical biosensor based on the nanocomposites of cobalt phthalocyanine (CoPc) anchored with graphene quantum dots (GQDs) for DA and UA detection. The GQDs incorporation on CoPc nanorods with partial end stretching significantly enhances the electrocatalytic activity and promotes the electron transfer rate. Low detection limits of 21 n m for DA and 145 n m for UA have been successfully achieved for the fabricated CoPc/GQDs biosensor. The density-functional theory proves the enhanced conductivity of CoPc/GQDs and the biomolecule's interaction with the electrode surface. Furthermore, the proposed sensor shows remarkable reproducibility, repeatability, and stability. The fabricated sensor is applied for the simultaneous detections of DA and UA in human urine samples. The excellent performance suggests that the CoPc/GQDs could be a promising and potential candidate for electrochemical sensors to detect DA and UA selectively.
研究领域:
生物传感器
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yemiao Gao,Shuhan Gao,Xinyang Pang,Dongdong Chu,Weixia Zhu,Jiajia Huang
Zinc-iodine batteries (ZIBs) still suffer from severe shuttle effects and sluggish reaction kinetics of the iodine species, which result in inferior cycle life and unsatisfactory rate performance. Although physical immobilization and chemical adsorption had been used to confine iodine species, the redox kinetics of iodine in ZIBs still needed to be improved. Herein, cobalt (II) phthalocyanines (CoPc) were loaded on actived carbon fiber (ACF) uniformly via π-π interaction and served as I 2 support to fabricate CoPc-ACF/I 2 cathodes materials of ZIBs. Actived carbon fiber (ACF) as effective catalyst support can achieve high dispersion of cobalt phthalocyanine (CoPc) while maintaining high conductivity of composite, and its favorable porous structure is also conducive to iodine loading. The electrocatalytic effect of CoPc can significantly reduce energy barriers and simultaneously accelerate charge transfer to achieve a faster reaction kinetic process for iodine reduction reactions. In particular, the CoPc-ACF matrix shows a remarkably lower Tafel slope (253.4 mV dec −1 ) and lower energy barrier (18.04 kJ mol −1 ) compared with the ACF matrix (395.69 mV dec −1 and 36.25 kJ mol −1 ) for the iodine redox reaction. Consequently, the CoPc-ACF/I 2 cathode delivers a specific capacity of 203.6 mAh g −1 at 0.5 A g −1 , an excellent rate capability with 151.4 mAh g −1 achieved even at 15 A g −1 , and ultra-stable cycle life over 8000 cycles with 89.2% capacity retention. This work provides fresh insight into the design and development for achieving ZIBs with high performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Fengshou Yu,Zhixiang Zhou,Yang You,Jiayu Zhan,Tong Yao,Lu-Hua Zhang
Precise electronic state regulation through coordination environment optimization by metal–support interaction is a promising strategy to facilitate catalysis reaction, while the limited density of functional groups in the bulk substrate restricts the regulation degree. Herein, different sizes of Ti3C2Tx MXene with hydroxyl (−OH) terminal including the MXene layer (ML-OH, 3 μm), the MXene nanosheet (MNS-OH, 600 nm), and the MXene quantum dot (MQD-OH, 8 nm) were prepared to anchor CoPc, and the effect of −OH density on the performance of electrochemical CO2 reduction was systematically investigated. Notably, a linear relationship was established by plotting reactivity vs hydroxyl density. With the highest −OH density, CoPc/MQD-OH exhibits a superior Faradaic efficiency for CO formation (FECO) of ∼100% at −0.9 to −1.0 V vs RHE and a high FECO of >90% over a wide potential window from −0.8 to −1.4 V. The mechanism exploration shows that the axial coordination interaction of the −OH terminal with Co increases the electron density of the Co site, thus promoting the adsorption and activation of CO2. This work provides a new insight into designing of molecular catalysts with high efficiency and tunable structure for other electrochemical conversions.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Zhiguo Shang,Zhexin Zhu,Gangqiang Wang,Wangyang Lu,Bingyao Wu,Qijian Li
In this study, each cobalt tetra-aminophthalocyanine (CoTAPc) molecule was immobilised with four isonicotinic acid (INA) molecules by amide bonding, a novel and highly efficient catalyst pyridine-bridged cobalt tetra-aminophthalocyanine (CoTAPc-TINA) was synthesised. The introduction of INA molecules promoted CoTAPc to expose more active sites, and increased the electron cloud density of cobalt ions promoting O–O bond homolysis of PMS to generate more active species, which significantly enhanced catalytic activity. With the pharmaceutical of carbamazepine (CBZ) as model pollutant, 0.1 g/L CoTAPc-TINA in dark in the presence of 0.4 mM PMS, 98.8% CBZ was removed within 10 min. However, under the same conditions the removed of CBZ was only 58.9% by CoTAPc/PMS system. Radical capture experiments combined electron paramagnetic resonance technology demonstrate that hydroxyl radicals, sulphate radicals, superoxide radicals and singlet oxygen are the main active species in the CoTAPc-TINA/PMS system. As the reaction proceeded, all aromatic intermediates were transformed to small molecular acids by these active species. This investigation provided a new insight for application of metal phthalocyanine in wastewater treatment.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）