APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 6
·e7504
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IF 3.7
Qiuyun Zhang,Mengmeng Hu,Fan Chen,Jiao Lei,Jingsong Cheng,Juan Ma,Yongting Zhao,Yutao Zhang
Development of an energy-efficient and economical route is necessary for society to synthesize green biofuels. Herein, cobalt-doped tungstophosphoric acid (Co-HPW) is in-situ impregnated in the Zr-based metal–organic framework (MOF-801) forming composite of Co-HPW/MOF-801. The chemical composition, morphology, and acidic sites of the Co-HPW/MOF-801 composite were analyzed through x-ray diffractometer (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), thermogravimetric analysis (TG), N 2 physisorption, ammonia temperature-programmed desorption (NH 3 -TPD), pyridine-adsorbed infrared spectra (Py-FTIR), and x-ray photoelectron spectroscopy (XPS). The catalytic performance of the as-synthesized catalyst was explored to catalyze esterification of lauric acid (LA) with methanol. The outcomes revealed that the Co-HPW/MOF-801 nanocatalyst achieved a high conversion of 86.3% under the optimized reaction condition (catalyst amount of 0.15 g, temperature of 100°C, time of 4 h, and methanol/LA molar ratio of 20:1). The excellent catalytical performance is mainly due to the large BET surface area, exposure of more active centers from available pore structure, and simultaneous possession of high Lewis and Brønsted acidity. Furthermore, the kinetic study revealed that the reaction process was kinetically controlled and the activation energy was found to be 42.1 kJ/mol. The results suggest that the synthesized Co-HPW/MOF-801 nanocatalyst is an environmental greenness, low cost, and suitable for easy scale-up for the production of biofuels.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lingli Wang,Xu Guo,Yingying Chen,Shasha Ai,Hanming Ding
Cobalt-mediated peroxymonosulfate (PMS) activation is an effective way to generate sulfate radicals for the degradation of pollutants. Herein, a heterogeneous Co-based catalyst was prepared by integrating the cobalt species to the cavities of g -C 3 N 4 via the Co N bonds through the methods of impregnation and calcination, which was applied to activate PMS for the degradation of organic contaminates under visible light. The cobalt species were atomically dispersed on g -C 3 N 4 , which could provide more reactive sites for PMS activation. The catalytic efficiency of cobalt-doped g -C 3 N 4 was greater than that of pure g -C 3 N 4 or even slightly higher than that of the homogeneous cobalt ions during the photo-assisted PMS activation catalytic processes. The optimum Co loading is 1.0% in weight. In 25 min, the dye of rhodamine B was almost completely degraded with a 70.5% of total organic carbon (TOC) removal under its natural pH value in the presence of such catalytic system. The enhanced catalytic activity of Co-doped g -C 3 N 4 was due to the effective separation of the photo-generated charges as well as the sufficient accessible reactive sites for PMS activation. And the synergistic interaction between the photocatalytic and PMS activation processes facilitated the generation of active species for the removal of pollutants.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yangqin Gao,Guoqing Yang,Yanjie Dai,Xuli Li,Jianfeng Gao,Ning Li,Ping Qiu,Lei Ge
Co-substituted LaFeO3 was electrodeposited on the surface of BiVO4 as a co-catalyst to enhance the water splitting performance. Compared to bare BiVO4, the BiVO4/Co-LaFeO3 composite photoanode shows a water oxidation photocurrent of 3.4 mA/cm2 at 1.23 V versus reverse hydrogen electrode, accompanied by a notable cathodic shift in the onset potential for 300 mV. Combined optical and electrochemical characterizations show that the solid/electrolyte charge transfer efficiency of BiVO4 are dramatically improved by the incorporation of Co-substituted LaFeO3. From the surface kinetic study of charge carriers by intensity-modulated photocurrent spectroscopy, a suppressed surface recombination rate constant is observed and the enhanced photoelectrochemical water splitting performance observed in the BiVO4/Co-LaFeO3 photoanode is attributed to the surface passivation effect of Co-substituted LaFeO3.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Linxing Zhang,Jun Chen,Longlong Fan,Zhao Pan,Jiaou Wang,Kurash Ibrahim,Jianjun Tian,Xianran Xing
To settle the growing energy crisis, photovoltaic , as the renewable solar energy, based on ferroelectric oxides has recently attracted significant attention for the breakthrough in photovoltaic application. Herein, we deposited the ferroelectric Bi 0.925 Sm 0.075 Fe 0.95 Co 0.05 O 3 (BSFC) thin films on FTO glass substrates along with uniform microstructure and multi-orientation polycrystalline. The BSFC thin films possess good ferroelectric properties with a standard hysteresis loop attributed to Co-substitution. Intriguingly, an enhancement of both photocurrent (90.4%) and photovoltage (40.0%) in BSFC thin films has been observed, indicating that the ferroelectric polarization plays an important role in the bulk effect of ferroelectric photovoltaic. Furthermore, the Co-substitution induced an increasing trend in saturation magnetization of 6.2 emu/cm 3 in BSFC thin films. The enhancement of the multiferroics and photovoltaic properties facilitates its applications of energy conversion and information storage.
研究领域:
材料科学
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能源科学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qinghe Wei,Dan Wang,Lili Zhang,Liqing Zhao,Bing Zhang,Guoli Zhou,Yafei Zhao
Exploring inexpensive and active bifunctional electrocatalysts to produce hydrogen and oxygen from water at all pHs is highly desirable. Herein, we report a facile one-step method to prepare vertically aligned Co doped MoS 2 nanosheets with extended interlayer distance on carbon cloth (Co–MoS 2 @CC) for full hydrolysis in both alkaline and acidic medium. Co–MoS 2 @CC exhibits long-term durability with overpotentials of 56.6 mV and 130 mV for hydrogen generation and 242 mV and 201 mV for oxygen production at 10 mA cm −2 in basic and acidic conditions, respectively. Moreover, we achieve low voltages of 1.585 V and 1.55 V in basic and acidic conditions respectively for the overall water splitting. We assume that such excellent property of Co–MoS 2 @CC may be ascribed to the uncovering of more active sites and high porosity resulted from Co doping, which boosts the conductivity and thus reduces MoS 2 hydrogen adsorption free energy in HER, as well as benefits to catalytic active sites in OER. This one-step doping approach opens up new ways to regulate the intrinsic catalytic activity to catalyze total hydrolysis at all PHs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jinglin Zhu,Jiong Wang,Chao Shan,Jing Zhang,Lu Lv,Bingcai Pan
Cobalt-mediated activation of peroxymonosulfate (PMS) is an attractive option for degradation of organic pollutants in water. How to develop durable Co-based catalysts (i.e., low Co leaching) of high activity is still a challenging task. In this study, Co-doped mesoporous FePO 4 was synthesized via a facile sol-gel method followed by calcination. Multiple characterizations indicated that the Co species were uniformly distributed within the crystal structure of FePO 4 . The resultant catalysts possessed large surface area to provide substantial active sites for the activation of PMS. The Co-doped FePO 4 with an optimized Co/Fe molar ratio of 0.1 (CoFeP-0.1) was highly effective and robust for degradation of atrazine at pH = 7 in PMS system with trivial Co leaching (52 μg/L or lower). The pseudo first-order kinetic constant of atrazine degradation was 0.225 min −1 , about 2.7 times and 23 times higher than that of Co 3 O 4 and CoFe-0.1, respectively. Both experimental study and density functional theory (DFT) calculation suggested that the excellent catalytic performance of CoFeP-0.1 was ascribed to the well dispersion of Co species in the mesoporous FePO 4 and the fast electron transfer of Co 2+ /Co 3+ redox via the charge redistribution between Fe atom and Co atom. A reasonable mechanism of CoFeP-0.1/PMS system-based catalysis was proposed where SO 4 − was primarily responsible for the degradation of atrazine.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 6
·e202102562
·
IF 9.14
Mewin Vincent,Venkata Sai Avvaru,Maciej Haranczyk,Vinodkumar Etacheri
Graphical Dual ion storage : A high-performance and ultralong-life Mg−Li hybrid battery is presented, with the cobalt-doped anatase (Ti 1- x Co x O 2- y ) nanosheet cathode exhibiting outstanding pseudocapacitance. In-situ X-ray diffraction measurements reveal the unique Mg−Li dual-ion storage mechanism. This tactic presents new opportunities to design advanced Mg−Li hybrid batteries. Despite the proposed safety, performance, and cost advantages, practical implementation of Mg−Li hybrid batteries is limited due to the unavailability of reliable cathodes compatible with the dual-ion system. Herein, a high-performance Mg−Li dual ion battery based upon cobalt-doped TiO 2 cathode was developed. Extremely pseudocapacitance-type Ti 1- x Co x O 2- y nanosheets consist of an optimum 3.57 % Co-atoms. This defective cathode delivered exceptional pseudocapacitance (maximum of 93 %), specific capacities (386 mAh g −1 at 25 mA g −1 ), rate performance (191 mAh g −1 at 1 A g −1 ), cyclability (3000 cycles at 1 A g −1 ), and coulombic efficiency (≈100 %) and fast charging (≈11 min). This performance was superior to the TiO 2 -based Mg−Li dual-ion battery cathodes reported earlier. Mechanistic studies revealed dual-ion intercalation pseudocapacitance with negligible structural changes. Excellent electrochemical performance of the cation-doped TiO 2 cathode was credited to the rapid pseudocapacitance-type Mg/Li-ion diffusion through the disorder generated by lattice distortions and oxygen vacancies. Ultrathin nature, large surface area, 2D morphology, and mesoporosity also contributed as secondary factors facilitating superior electrode-electrolyte interfacial kinetics. The demonstrated method of pseudocapacitance-type Mg−Li dual-ion intercalation by introducing lattice distortions/oxygen vacancies through selective doping can be utilized for the development of several other potential electrodes for high-performance Mg−Li dual-ion batteries.
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
Small
·
2021
·Vol. 17
·期 33
·2102097
·
IF 13.281
Chunqiao Jin,Pengbo Zhai,Yi Wei,Qian Chen,Xingguo Wang,Weiwei Yang,Jing Xiao,Qianqian He,Qingyun Liu,Yongji Gong
Ultrathin nickel (Ni)-based sulfide nanosheets have been reported as excellent electrocatalysts for overall water splitting; however, the uncontrollability over thickness due to the nonlayered structure still hampers its practical application. Herein, a simple topochemical conversion strategy is employed to synthesize cobalt-doped Ni 3 S 2 (Co-Ni 3 S 2 ) ultrathin nanosheets on Ni foam. The Co-Ni 3 S 2 nanosheets are controlled synthesized by using Co-Ni(OH) 2 ultrathin nanosheets as templates with anneal and sulfurization treatment, showing exceptional electrocatalytic activity. This template-assisted method can also be applied to obtain Ni, NiO, and NiP x nanosheets, providing a universal strategy to synthesize ultrathin nanosheets of nonlayered materials. The overall water splitting of this Co-Ni 3 S 2 ultrathin nanosheets achieves a low voltage of 1.54 V at a current density of 10 mA cm −2 and high durability in 1 m KOH, comparable to the best performance of electrochemical water splitting ever reported. The detailed structural transformation of Ni-based sulfides in the catalytic process and its mechanism are further explored both experimentally and theoretically.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Zi-Hao Zhang,Lin-Chang Liu,Chen-Xi Zhang,Hong-Lin Zhu,Yue-Qing Zheng
Alloy catalyst has been widely studied and used for hydrolytic dehydrogenation of ammonia borane (NH 3 BH 3 , AB) with excellent catalytic performance due to the synergistic effect of bimetal . Herein, a series of Rh 1-x Co x /Ni@Ni–N–C catalysts were prepared by an impregnation reduction method. The optimized Rh 0.75 Co 0.25 /Ni@Ni–N–C catalyst exhibited good catalytic performance with turnover frequency of 223.08 mol H2 mol cat −1 min −1 at 303 K, but decreased the catalytic performance compared with Rh/Ni@Ni–N–C. According to the XPS and Raman analysis, the RhCo alloy nanoparticles could be loaded at the defect position of Ni@Ni–N–C, and the Co nanoparticles occupied the intercalation between Rh and the defective site of the carrier, which could weaken the catalytic activity of AB hydrolysis. Based on the above research, we proposed the catalytic mechanism of the activation of the RhCo–H species. This work provides a new strategy for designing alloy-supported nano-catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lijiao Sun,Ying Wang,Lixian He,Jie Guo,Qingwen Deng,Xia Zhao,Ya Yan,Kezhen Qi
In this work, AgInS 2 (AIS) and cobalt (Co) doped AgInS 2 (Co-AIS) are prepared by low-temperature liquid phase method using thioglycolic acid (TGA) as the stabilizing agent. The crystal structure, surface elements, binding energy, particle morphology , and optical properties of AIS and Co-AIS are analyzed by XRD , XPS , SEM, TEM, UV-Vis-DRS, and PL . Rhodamine B (RhB) and 4-nitrophenol (4-NP) are used as the model pollutants for evaluating the photocatalytic activities of AIS and Co-AIS. The optimal doping ratio of CoːIn is found to be 10.7:6.3. And, under this optimal ratio, Co-AIS can degrade 95 % of RhB in 1.5 h or 76 % of 4-NP in 2.5 h, respectively. The photocatalytic mechanism is proposed based on the active species trapping experiment, EPR technique, optical properties characterization, and the flat-band potential determination. Moreover, the photocatalytic water splitting performance of Co-AISs with or without the modification of the multi-walled carbon nanotubes (MWCNTs) are investigated, and remarkable hydrogen production is achieved. This research will open a new gateway to synthesizing AgInS 2 -based materials and exploring their photocatalytic activities.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ziyi Xiao,Rui Wu,Tingting Shu,Yingxi Wang,Ling Li
In order to further improve the catalytic performance of MIL-101, cobalt-doped MIL-101(Fe,Co) was synthesized by solvothermal method. By adjusting the ratio of cobalt doping, the MIL-101(Fe,Co 20% ) with the best catalytic activity was obtained. The activation performance of MIL-101(Fe,Co 20% ) for peroxymonosulfate (PMS) was studied using Rhodamine B (RhB) as a pollutant model. The experimental results proved MIL-101(Fe,Co 20% ) with much better catalytic performance than MIL-101(Fe), which can degrade more than 99% of RhB within 15 min. The effects of initial solution pH and coexisting anions in water on the degradation of RhB were further discussed. The results showed that MIL-101(Fe,Co 20% ) was with excellent stability and degradation efficiency can still keep above 90% after five cycles. The free radical quenching experiments were further studied to explore the degradation mechanism. It can be concluded that SO 4 - · was the main active free radical for the degradation of RhB. The possible intermediate products in the degradation process of RhB were analyzed by LC-MS. Combined with the comparison of XPS before and after the reaction, the possible reaction mechanism of RhB degradation process was inferred.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Guangjun Lv,Xin Dai,Yide Qiao,Guopan Ren,Qiang Tan,Sheng-Wu Guo,Yong-Ning Liu,Yuanzhen Chen
Challenges remain to show good capacitive performance while achieving high loadings of active materials for supercapacitors. Trying to realize this version, a nickel-protecting carbon fiber paper@Co-doped NiSx (Ni-CP@Co–NiSx) electrode with high specific gravimetric, areal, and volumetric capacitance is reported in this work. This free-standing electrode is prepared by an electroplating-hydrothermal-electroplating (EHE) three-step method to achieve a high loading of almost 26.7 mg cm–2. The cobalt-doping and nickel-protection strategies effectively decrease the impedance and inhibit the active material dropping from the electrode resulting from the expansion stress, which endows the Ni-CP@Co–NiSx electrode with a high rate and good cycling performance, especially with an ultrahigh specific areal/volumetric/gravimetric capacitance of 53.3 F cm–2/2807 F cm–3/1997 F g–1 at 5 mA cm–2, respectively. Employing activated carbon functionalized with riboflavin (AC/VB2) as a negative electrode, the asymmetric supercapacitor device delivers a very high energy density of up to 60.4 W h kg–1. This work demonstrates that electrodes with a high loading density and excellent performance can be obtained by the combination of the EHE method to adjust the internal conductivity and external structural stability.
研究领域:
材料科学
·
能源存储技术
✓ 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）