JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Huamei Tong,Xinyu Zheng,Mengyue Qi,Di Li,Jianjun Zhu,Deli Jiang
Constructing bifunctional non-precious metal electrocatalysts with advanced industrial value and excellent electrocatalytic performance to achieve efficient overall water splitting is important but difficult. Herein, a heterogeneous electrocatalyst comprising of CoMo alloys anchored Fe 2 O 3 nanosheets was prepared by hydrothermal and electrodeposition methods. The strongly coupled interfaces between the CoMo alloys and Fe 2 O 3 nanosheets promote charge redistribution, which could improve electron transfer efficiency and accelerate reaction kinetics, potentially optimizing reactant adsorption energy. Further density functional theory (DFT) calculations reveal that the construction of CoMo/Fe 2 O 3 /NF heterostructured catalyst facilitates to promote interfacial charge redistribution and enhance charge transfer capacity, thus boosting the catalytic performance. Benefiting from this, the optimal CoMo/Fe 2 O 3 /NF heterostructure demonstrates a minimal overpotential of 71 mV at 10 mA cm −2 for the HER and 266 mV at 50 mA cm −2 for the OER. Remarkably, the catalyst served as a bifunctional electrode for water splitting, resulting in a cell voltage down to 1.5 V at a current density of 10 mA cm −2 . This research provides an effective way for the construction of non-precious iron oxides-based bifunctional electrocatalysts using alloy/metal oxide interfacial engineering strategy.
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
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 5
·1088-1098
·
IF 3.552
Shang Hui,Guo Chong,Ye Pengfei,Zhang Wenhui
Catalytic hydrodesulfurization (HDS) technique is widely used for clean gasoline production. However, traditional HDS catalyst (CoMo/γ-Al 2 O 3 ) exhibits high hydrogenation performance of olefins (HYDO), resulting in the loss of gasoline octane number. To achieve high HDS/HYDO ratio, the key issue is to reduce the interaction between active metals and the support, therefore, in this research, the modified CoMo/γ-Al 2 O 3 catalysts with various boron amounts were investigated under traditional or microwave heating. The effects of preparing methods as well as boron amounts on the active phase, acidic properties and HDS catalytic activities were examined. Results show that the modification, especially under microwave treatment, can significantly weaken the interaction between the active component and the support by enlarging the surface area and pore diameter, and reducing the acidity of the support. As a result, the stacking numbers of MoS 2 slabs were obviously improved by the modification and microwave treatment, contributing to higher edge/ rim ratio, and resulting in higher HDS performance and selectivity to olefin.
研究领域:
催化化学
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能源化工
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Penglin Ma,Zengyi Ma,Jianhua Yan,Yike Zhang,Qunxing Huang
Waste tire pyrolysis oil (WTPO) exhibits high calorific value but requires heteroatoms (S/N) and polycyclic aromatic hydrocarbons (PAHs) reduction for fuel applications. Hydrotreatment is an effective method for removing these heteroatoms, enhancing hydrocarbon saturation, and improving oil quality. This study compares unpresulfurised CoMo/Al 2 O 3 catalytic versus non-catalytic hydrotreatment to upgrade WTPO. The research systematically explores the transformation of sulfur- and nitrogen-containing compounds, as well as hydrocarbons, under various reaction conditions. The difficulty of hydrogenation desulfurization for four types of sulfur-containing compounds was ranked. C–N bonds in linear compounds and heterocycles in nitrogen-containing compounds can break under the influence of a catalyst or at elevated temperatures and pressures. However, the direct elimination of nitrogen atoms bonded to the benzene ring in aniline-like compounds remains challenging using this catalyst. A representative heterocyclic compound containing both nitrogen and sulfur, benzothiazole, underwent ring-opening conversion to aniline. Even when using unpresulfurized catalysts at higher weight hourly space velocity (WHSV), dehydrogenation side reactions and PAHs formation can be suppressed to a certain extent. Based on these findings, this paper offers useful insights into the catalytic performance of CoMo/Al 2 O 3 during WTPO hydrotreatment and provides practical references for catalyst selection and reaction condition optimization.
研究领域:
环境化学
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能源化工
·
催化科学
·
燃料技术
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资源循环利用
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 7
·期 2
·466-480
·
IF 5.287
Sijia Liu,Xin Liang,Jie Zhang,Biaohua Chen
Two different kinds of γ-Al2O3 precursors: stick-like ammonium aluminum carbonate hydroxide and willow leaf-like boehmite could be selectively synthesized via a facile hydrothermal method by just adjusting reaction temperature. After heat treatment, γ-Al2O3 with two different morphologies (stick-like and willow leaf-like) were synthesized and used as supports for CoMo hydrodesulfurization catalysts. Fourier transform infrared spectroscopy of pyridine adsorption and NH3-temperature-programmed desorption showed that stick-like γ-Al2O3 (ACH) and willow leaf-like γ-Al2O3 (AOH) exhibited a lower Lewis acidity than commercial γ-Al2O3. X-ray diffraction indicated that CoMo oxidic catalysts supported on ACH and AOH contained more β-CoMoO4 phase. X-ray photoelectron spectroscopy and high resolution transmission electron microscopy revealed that after presulfurization, more CoMoS active sites and multilayered (Co)MoS2 slabs formed on ACH and AOH supports, thereby creating catalysts with a higher hydrodesulfurization activity in the hydrodesulfurization of thiophene and 4,6-dimethyldibenzothiophene.
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
ENERGY & FUELS
·
2019
·
IF 3.021
Butian Xia,Liyuan Cao,Kaiwei Luo,Liang Zhao,Xiaoqin Wang,Jinsen Gao,Chunming Xu
The modified CoMo/γ-Al2O3 catalysts with different Ce and/or P loading were prepared by the incipient wetness impregnation method. The catalysts were characterized using X-ray fluorescence spectroscopy, N2-adsorption–desorption, pyridine Fourier transform infrared, H2 temperature-programmed reduction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. The effect of Ce and/or P on the active phase, acidic properties, and catalytic activity of the CoMo/γ-Al2O3 catalysts were investigated in detail. The results showed that the phosphorus additive can slightly increase the stacking number of MoS2 slabs by reducing the metal–support interaction. Also, the addition of a small amount of cerium (1.75 wt %) not only increased the average slab length and stacking layer number of MoS2 slabs, but also formed new Brønsted acid sites on the support, which efficiently enhance the thiophene hydrodesulfurization (HDS) and olefins isomerization activity of the catalyst. These favorable effects are more obvious in cases where cerium and phosphorus coexist. The CoMo/γ-Al2O3P(2)Ce(1.75) catalyst exhibited the highest thiophene HDS and olefin isomerization conversion values of 98.58 and 19.51%, respectively. The high isomerization activity is able to inhibit the loss of gasoline octane number. Based on the above results, it can be concluded that the synergistic effect between Ce and P can achieve deep desulfurization and minimize the loss of octane number by modulating the acidity of the support and optimizing the active phase of the sulfided catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2014
·Vol. 5
·期 1
·549-555
·
IF 4.76
Feng Cui,Guangci Li,Xuebing Li,Mohong Lu,Mingshi Li
The carbon-covered aluminas were prepared by using different monocarboxylic acids as carbon sources to modify active alumina, and then were used as supports to prepare supported CoMo catalysts for hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT). These monocarboxylic acid molecules can be readily converted to carbon species by thermal decomposition in a nitrogen atmosphere and deposited on an alumina surface. The carbon species can then effectively weaken the interaction between active metals and alumina, which improves the migration and growth of surface Mo species. This result further affected the morphology and orientation of surface sulfur species, that is, the slab length and stacking number of the MoS2 slabs, which closely relates to HDS activity. Since the surface Mo species supported on the alumina modified with acetic acid consisted of the MoS2 slabs with the shortest lengths, leading to the presence of more easily reducible sulfur species during the reaction, the corresponding catalyst exhibited the highest HDS activity for 4,6-DMDBT. In addition, the stacking numbers for all of the catalysts were relatively low, which hindered the adsorption of 4,6-DMDBT on the brim sites of the MoS2 stacks, and thus the HDS reaction mainly occurred through the direct desulfurization route.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Wenjing Song,Weikun Lai,Yixin Lian,Xingmao Jiang,Weimin Yang
Catalytic transformation of lignin is a sustainable way to provide aromatics, which depends on the structure and property of catalytic sites. A bifunctional sulfated ZrO 2 supported CoMo sulfide catalyst has been synthesized by in situ exsolution approach. The exsolved CoMo-sZr(exs) catalyst significantly enhanced the initial C–O bond cleavage rate (0.058 mol·g −1 ·h −1 ) compared to the impregnated and physically mixed sulfated ZrO 2 supported CoMo sulfide catalysts. Notably, the reusability tests also showed that the as-prepared catalyst presented total ethers conversion of 94% with aromatics yield of 86% after four consecutive cycles. This was related to the appropriate sulfide-support interaction, acid sites and highly-dispersed CoMo sulfide, in conformity with the catalyst characterization. Thereby it could facilitate reactant adsorption and effectively break down the C–O bonds in lignin derived fragments to form aromatics. This work points out a new avenue for the design of effective bifunctional catalysts for lignin depolymerization.
研究领域:
催化化学
·
可再生能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shudi Yu,Dongmei Liu,Cheng Wang,Jie Li,Rui Yu,Yong Wang,Jiongting Yin,Xiaomei Wang,Yukou Du
Oxygen evolution reaction (OER) is a multi-electron transfer process, whose intrinsic sluggish dynamic restricts the whole process of overall water splitting (OWS). To address this issue, a porous transition metal sulfide (TMS) catalyst with rich heterojunctions was prepared by vulcanization and trace Fe doping of CoMo-based metal–organic framework (MOF). In this work, the nanoflower composed of ultrathin 2D nanosheets anchored on a nickel foam presents a layered interface that contributes to the exposure of active regions. The resulting electrode denoted as Fe@CoMo 2 S 4 /Ni 3 S 2 /NF required a low overpotential (η 10 = 167 mV @ 10 mA cm −2 , η 50 = 260 mV @ 50 mA cm −2 ) in 1.0 M KOH for OER and a small cell voltage (E = 1.513 V @ 10 mA cm −2 ) to power OWS when coupled with commercial Pt/C. It also exhibited splendid morphological and chemical stability with virtually invariant polarization curve and flower-like appearance after 1000 CV cycles, as well as long-term durability over 100 h with a constant current density of 10 mA cm −2 . This work revealed the multi-anionic regulation mechanism in the surface reconstruction of sulfide electrocatalysts, and verified that Co/Mo/Ni-based oxysulfide was the true active substance of OER, which inspired the understanding and design of multi-anionic regulated electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiao Chen,Jian Cui,Shuaining Wu,Xifeng Xia,Luyu Yang,Dongping Sun,Xuran Xu,Xufei Zhu
Electrochemical sensing is a widely adopted technique for the detection of target molecules even at a trace concentration. The key component in an electrochemical sensor is the electrode, for which layered double hydroxides (LDHs) have received significant attention because of their compositional tunability. However, it is still challenging to achieve mass production of LDHs as electrodes with structural integrity and regularity. Here, using Co-based metal organic frameworks (ZIF-67) as the precursor, a template-sacrificing strategy is reported to synthesize hollow CoMo-LDH (hCoMo-LDH) nanopolyhedra, which was used as a self-supporting electrode for electrochemical sensing. Using nitrite as the target, our hCoMo-LDH/CC electrode exhibits an ultralow detection limit (0.01 μM), a wide linear range (1 to 1500 μM), and a striking sensitivity (1020 μA·mM–1·cm–2). Density functional theory calculations were employed to obtain a mechanistic understanding on the exceptional performance of the hCoMo-LDH nanopolyhedra resulted from the Mo doping. Furthermore, the electrode demonstrates excellent stability, strong anti-interference property, and good suitability in real water samples. Our work provides more opportunities for the design of self-supporting electrode in electrochemical sensing applications.
研究领域:
材料科学
·
电化学
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Yanbin Qi,Yihua Zhu,Hongliang Jiang,Chunzhong Li
Designing efficient, stable, and easily scaled-up catalysts for nucleophile oxidation reactions (NOR) is a key step in promoting the industrial application of NOR. Here, a simple physical mixing strategy is adopted to prepare a mixture of NiMo oxide and CoMo oxide as catalyst for methanol electrocatalytic oxidation reaction (MOR). The mixture exhibits high catalytic activity for MOR and its performance far exceeds that of a single component. The interaction at the contact interface between nickel and cobalt components is clarified through operando electrochemical impedance spectroscopy, in-situ Raman spectroscopy, and a series of electrochemical tests. The interfacial interaction enhances the charge transport and promotes the formation of electrophilic OH* species, which significantly boosts the methanol oxidation reaction. This work provides a new idea for the design of efficient and easily scaled-up catalysts for nucleophile oxidation reactions.
研究领域:
催化
·
电化学
·
材料科学
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yuanyuan Guo,Qi Huang,Junyang Ding,Li Zhong,Ting-Ting Li,Junqing Pan,Yue Hu,Jinjie Qian,Shaoming Huang
The rational design and facile synthesis of transition metal-based catalysts supported by carbon nanomaterials with high activity, selectivity and stability remain a great challenge. Recently, the low-cost, stable and high-performance electrocatalysts for efficient oxygen evolution reaction (OER) derived from porous metal-organic framework (MOF) precursors have attracted numerous attention. Herein, a new type of CoMo carbide/nitride embedded in the flower-like carbon materials ( CoMo-MI-T , MI = 2-Methylimidazole, T = 400, 500, 600, 700 °C) has been synthesized by a simple pyrolysis , in which bimetallic CoMo-MI precursors can be conveniently converted from crystalline cobalt-based MOFs of Co-MI by solvothermal reaction. The pyrolyzed CoMo-MI-T series exhibits a hierarchically porous nanostructure, high Co 3 Mo 3 C/N content, suitable N-doping, graphitic carbon layers as well as well-preserved flower-shaped morphology, which shows an excellent OER performance. Among them, the most optimal CoMo-MI-600 owns the small overpotential of 316 mV at 10 mA cm −2 and Tafel slope of 89.9 mV dec −1 in 1.0 M KOH solution. Meanwhile, the rotating ring-disk electrode technique is examined to verify near 4-electron transfer process for CoMo-MI-600 together with a high Faradaic efficiency of 98.7%. The well-performed CoMo-MI-600 electrocatalyst may be stemmed from the best balance of the synergistic effect of abundant multi-component, suitable electrical conductivity and large porosity. The current work will provide a new route to prepare MOF-derived bimetallic active sites in porous carbon nanomaterials with satisfactory activity and robust stability in the relevant energy applications .
研究领域:
材料科学
·
电化学
·
能源催化
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Yutong Huo,Zheng Zhong,Shitong Liu,Shitong Sun,Weiguo Yao,Quanming Li,Yanli Dou
Considering the requirement of environmental and bio-friendliness of flame retardants, there is an urgent need to develop efficient flame retardants based on low-toxicity raw materials. Herein, a nano-fold structure DBN@CoMo-LDH was successfully synthesized by combining layered double hydroxides (LDHs) with hexagonal boron nitride (h-BN), through a sacrificial template approach involving ion-exchange interaction at atmospheric pressure. Thanks to the better compatibility and strong interfacial interactions of hybrids in matrix, epoxy resin (EP) composites can exhibit superior flame retardancy and smoke suppression without loss of mechanical properties. The enhancement and mechanism of fire safety of EP composites were investigated through cone calorimetric test, condensed-phase residue analysis, and gas-phase product analysis. Compared to EP, the peak heat release rate (pHRR), peak smoke production rate (pSPR), total smoke production (TSP), carbon monoxide production rate (COP) and carbon dioxide production rate (CO 2 P) of EP/4DBN@CoMo-LDH were reduced by 37.77 %, 62.96 %, 50.45 %, 45.71 % and 40.98 %, respectively. DBN@CoMo-LDH not only promoted the rapid generation of a dense carbon layer, but also effectively suppressed the release of gas phase products. Furthermore, it demonstrates excellent antimicrobial properties against both Staphylococcus aureus and Escherichia coli . Moreover, the unique nano-fold structure can provide a good thermal conduction path in the matrix, improving the thermal conductivity of EP. This study offers a feasible approach for designing high-performance flame retardants, and suggests their potential application in multifunctional EP composites.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 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）