APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Junjun Lv,Panpan Liu,Rushuo Li,Linmeng Wang,Kaiyue Zhang,Peiyun Zhou,Xiubing Huang,Ge Wang
A series of self-supported electrocatalysts composed of tri-metallic CoFeV-LDHs generated on conductive carbon cloth (denoted as CoFeV@CC) have been constructed. The specific interaction among Co, Fe and V is systematically revealed via tuning the molar ratios of M 2+ :M 3+ and Fe 3+ :V 3+ in these tri-metallic LDHs. Finally, the optimal synergistic effect is reached when the molar ratios of M 2+ :M 3+ and Fe 3+ :V 3+ are respectively 4:1 and 1:1, resulting in the product named Co 8 FeV@CC, which displays the best overall OER and HER performance. Only rather low overpotentials of 235 and 182 mV are required to attain the current density of 100 mA cm −2 with a Faradaic efficiency of nearly 100 % for OER and HER, respectively. Co 8 FeV@CC can thus be applied as both an anode and cathode in the symmetrical two-electrode and possesses a current density of 100 mA cm −2 at the cell voltage of 1.65 V, and further demonstrates ultra-high stability for 100 h.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Weikang Zhu,Yabiao Pei,John C. Douglin,Junfeng Zhang,Haoyang Zhao,Jiandang Xue,Qingfa Wang,Ran Li,Yanzhou Qin,Yan Yin,Dario R. Dekel,Michael D. Guiver
Recently, much work has been devoted to designing catalysts with high porosity and efficient active sites. Although very promising results are achieved using Co/Fe–N–C catalysts based on rotating disk electrode (RDE) tests, actual fuel cell performance is below expectations, probably due to insufficient understanding of the catalyst layer (CL). Therefore, catalyst design should be considered holistically by taking into account CL performance, not only intrinsic activity. Here, Co/Fe–N–C with highly dispersed CoFe nanoalloy in the carbon network is obtained by careful design of Co/Fe-ZIF precursor, resulting in a high oxygen reduction reaction (ORR) site density with good stability. Concerning RDE test in the kinetic region and single cell test (SCT) with complex influence factors, the half-cell test (HCT) is introduced to more accurately evaluate the quality of the Co/Fe–CL. Multi-scale measurements (RDE, HCT and SCT) in different current density ranges allows targeting the key CL influence factors for fuel cell performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Hexiang Wang,Chenliu Tang,Luwei Wang,Zhirong Sun,Xiang Hu
A MOF-derived carbon material containing CoFe alloy (Co/Fe@NPC-500) by calcining N-doped Co/Fe bimetallic MOF at a lower temperature was successfully synthesized as a cathode in electro-Fenton process for ceftazidime (CAZ) degradation. The presence of Co could accelerate the transfer of electrons from C atoms of carbon material to Fe, thus increasing the content of low-valent metals in the material, which had been demonstrated by characterizations and density functional theory (DFT) calculations. Thanks to the integrity of the MOF structure, the synergistic effect between Fe and Co, Co/Fe@NPC-500 cathode showed efficient removal efficiency for CAZ completely removed within 60 min and obtained a total organic carbon (TOC) removal rate of 52.1% at 90 min. Besides, based on the results of HPLC-MS and DFT calculations, the degradation pathway of CAZ was proposed. This study provides some useful information for the preparation of MOF-derived carbon materials containing low-valent metals for electro-Fenton process.
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Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 4
·498-510
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IF 4.204
Bo Jinxiao,Li Mei,Zhu Xinli,Ge Qingfeng,Han Jinyu,Wang Hua
The electrochemical conversion of CO 2 -H 2 O into CO-H 2 using renewable energy is a promising technique for clean syngas production. Low-cost electrocatalysts to produce tunable syngas with a potential-independent CO/H 2 ratio are highly desired. Herein, a series of N -doped carbon nanotubes encapsulating binary alloy nanoparticles (M x Ni-NCNT, M= Fe, Co) were successfully fabricated through the co-pyrolysis of mela-mine and metal precursors. The M x Ni-NCNT samples exhibited bamboo-like nanotubular structures with a large specific surface area and high degree of graphitization. Their electrocatalytic performance for syngas production can be tuned by changing the alloy compositions and modifying the electronic structure of the carbon nanotube through the encapsulated metal nanoparticles. Consequently, syngas with a wide range of CO/H 2 ratios, from 0.5:1 to 3.4:1, can be produced on M x Ni-NCNT. More importantly, stable CO/H 2 ratios of 2:1 and 1.5:1, corresponding to the ratio to produce biofuels by syngas fermentation, could be realized on Co 1 Ni-NCNT and Co 2 Ni-NCNT, respectively, over a potential window of −0.8 to −1.2 V versus the reversible hydrogen electrode. Our work provides an approach to develop low-cost and potential-independent electrocatalysts to effectively produce syngas with an adjustable CO/H 2 ratio from electrochemical CO 2 reduction.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Rutong Song,Yurong Wu,Fei Zhong,Chunlin Chen,Zhikui Huang,Yaqi Ren,Wei Li,Jie Cao,Yichao Ding
Cu-doped PDA and PA were grafted onto GO to form a P-N-rich barrier (GPCu/PA). • Co-Fe/B nanosheets were grown on GPCu/PA to construct a hierarchical structure. • Multi-metal (Cu, Co, Fe) and boron synergistically enhance char formation and stability. • The hierarchical filler provides physical barrier, radical quenching, and catalytic charring. Water-based intumescent epoxy coatings for steel structures face challenges in simultaneously achieving high-efficiency flame retardancy, smoke suppression, thermal insulation, and long-term environmental durability. In this study, a hierarchical GPCu/PA/Co-Fe/B hybrid flame retardant was developed by sequentially grafting Cu 2+ -chelated polydopamine (PDA) and phytic acid (PA) onto graphene oxide (GO), followed by the in situ growth of Co-Fe/B nanosheets. This ingeniously designed structure integrates the layered barrier effect of GO, the catalytic charring capability of PDA and transition metal species, the phosphorus-promoted expansion effect of PA, and the protective effect of boron-containing compounds. Through these synergistic effects, the hybrid system facilitates the formation of a dense and stable char layer, thereby effectively suppressing heat conduction, oxygen diffusion, and the release of flammable volatiles during combustion. When incorporated into water-based epoxy coatings, just 2 wt% of GPCu/PA/Co-Fe/B significantly improves flame-retardant performance by reducing the back-surface temperature by 36.3%, increasing the char layer expansion height by 244.9%, and enhancing smoke suppression capabilities. The cone calorimeter test further confirmed the reduced heat release, smoke generation, and toxic gas emissions achieved by this coating, demonstrating its outstanding fire safety performance. Additionally, water immersion and UV-accelerated aging tests showed that even after environmental exposure, the coating maintained low water absorption, structural integrity, and flame-retardant properties, indicating excellent durability and weather resistance. This study provides a highly promising strategy for developing multifunctional, tiered flame-retardant systems for durable water-based intumescent coatings designed for fire protection of steel structures. Download: Download high-res image (370KB) Download: Download full-size image
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Bin Zhang,Ya’nan Li,Shuai Lu,Jonathan Richard Ishengoma,Song Wang,Jie Liu,Tao Tang,Sanxi Li
Plastic waste causes serious pollution to the environment. Being not satisfied with simply disposing of them into environment, people want to efficiently convert it into high-value products, such as H 2 and carbon nanotubes . A trimetallic catalyst is provided herein, which adds Pr, Ce, La or Yb to a Co-Fe bimetallic catalyst to inhibit the formation of oil by-product in a plastic pyrolysis reaction. In this work,various plastics，including plastics with different functional groups and real plastic waste were used for pyrolysis with elemental hydrogen efficiencies above 95% in the gas product. For pyrolysis of EVA, the gaseous hydrogen efficiency reached 96.07%, and for pyrolysis of LLDPE , the gaseous hydrogen efficiency reached 95.56%, over Pr 1 Co 1 Fe 8 O x catalyst. The role of Pr in catalytic reactions is discussed in general and the formation of carbon nanotubes of various types of structures is simulated. Catalyst cycling experiments demonstrate that the catalyst still maintains a gas hydrogen efficiency of more than 70% after being used four times. In conclusion, the Pr 1 Co 1 Fe 8 O x catalyst proved to be the best choice for microwave-assisted catalytic pyrolysis of plastics to H 2 , and this work provides a new perspect for the study of plastic pyrolysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Yunong Qin,Guoliang Lai,Ye Guo,Ling Li,Wenming Zhang
Co/Fe/CoFe-CNAs@NHCNFs has been synthesised through a template-free approach that exploits the synergistic effect of Co, Fe, and N-doped hollow carbon nanofibres. This resulting Co/Fe/CoFe-CNAs@NHCNFs catalysts display enhanced electrical conductivity and an expanded active surface area. The Co/Fe/CoFe-CNAs@NHCNFs catalyst exhibits remarkable electrocatalytic performance and achieves an oxygen evolution reaction (OER) an overpotential of only 1.55 V (10 mA cm −2 ), which shows excellent electrochemical properties. It is evident that the collaborative reaction among Co, Fe, and N refines the electronic configuration, thereby increasing the efficiency of electron transfer and strengthening the catalytic activity.The incorporation of N-doping enriches the catalyst with an augmented array of catalytic centers., which are highly effective for facilitating the oxygen reduction reaction (ORR) and OER, consequently lowering an activation energy required for these reactions. Its electrochemical performance is more remarkable than conventional Pt/C. The liquid zn-air battery based on Co/Fe/CoFe-CNAs@NHCNFs exhibites an open-circuit voltage reaching 1.396 V, the peak power density achieved was 253 mW cm −2 . Under a constant current discharge condition of 10 mA cm −2 , the battery exhibited over 60 hours of good cycling stability with no significant performance degradation. The solid-state rechargeable Zn-air batteries (RZABs) based on Co/Fe/CoFe-CNAs@NHCNFs catalyst demonstrate exceptional energy storage capacity and stability, exhibiting promising potential for practical applications
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Journal of Water Process Engineering
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2025
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IF 6.7
Xianxian Sheng,Tianliang Wang,Guilu Zeng,Xiang Zhang,Mudassir Habib,Shuguang Lyu
In the advanced oxidation process (AOPs) induced by sodium percarbonate (SPC), reactive oxygen species (ROS) can be scavenged by a large amount of dissolved Fe(II) released within a short time. To address this issue, a slow-release Fe(II) process is proposed in this study, thereby enhancing the degradation of contaminants. SPC/Fe(III)/amorphous boron (B) and SPC/Fe(III)/citric acid (CA) procedures were employed to remove polycyclic aromatic hydrocarbons (PAHs), with B as the reductant and CA as the chelator. Fluoranthene (FLT) removal in SPC/Fe(III)/B process contributed to HO•, while HO• and O 2 − • were responsible for FLT degradation via SPC/Fe(III)/CA system. SPC/Fe(III)/CA system exhibits more adaptability to intricate water quality circumstances compared to SPC/Fe(III)/B system. The bio-toxicity of FLT and their degradation intermediates was evaluated via the Toxicity Estimation Software Tool (T.E.S.T.), revealing a reduction in oral rat LD50, developmental toxicity, mutagenicity, and bioconcentration factor of the degradation intermediates relative to FLT. Both amorphous B- or CA-assisted SPC/Fe(III) processes were shown to be eco-friendly through luminosity inhibition tests with Vibrio fischeri . Experiments on soil slurry revealed that SPC/Fe(III)/CA system was feasible for the removal of complex PAHs, directing the SPC-induced AOPs process for the remediation of PAHs contaminated soils and groundwater.
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ACS Catalysis
·
2022
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IF 13.7
Xiao-Chen Sun,Kun Yuan,Wang-De Hua,Zi-Rui Gao,Qian Zhang,Chen-Yue Yuan,Hai-Chao Liu,Ya-Wen Zhang
The metal–support interface plays a crucial role in heterogeneous catalysis. The modulation of the metal–support interaction (MSI) affords the possibility of promoting the catalytic efficiency per active site. Here, we report a strategy to modulate the interfacial interaction and then optimize the interfacial activity of Co/CeO2 catalysts for the water–gas shift reaction (WGSR) by a facile NH3 treatment process for the CeO2 support. The sample of Co/800N-CeO2 treated at 800 °C exhibited the highest reaction rate of 260 μmolCO/(gCo s), which was 23.8 times higher than the rate of the untreated Co/CeO2 sample. A combination of ex situ and in situ characterizations suggested that addition of the NH3 treatment process did not only weaken the metal–support interaction between the Co species and CeO2 support to strengthen CO adsorption and CO activation ability but also induced oxygen vacancy generation under reaction conditions to accelerate H2O activation. Both worked together in promoting the catalytic efficiency for the WGSR via the carboxyl pathway at a low temperature. It was worth mentioning that the N species of the CeO2 support introduced by the NH3 treatment was removed after changing the catalyst structure under reaction conditions. The interfacial structure was robust in a 60 h test at 400 °C due to the coexistence mechanism of carboxyl and formate pathways avoiding the poisoning effect of formate species on the active sites. The construction of active interfaces could be extended to Fe/CeO2 and Ni/CeO2 catalysts and could bring great promise in the design of the interfacial structure of supported catalysts in wide applications including chemical transformation reactions and industrial catalysis.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Liping Fang,Kai Wang,Chen Han,Xinyong Li,Pei Li,Jieshan Qiu,Shaomin Liu
Piezocatalysis utilizes mechanical energy to achieve the required charge separation for redox reactions, a promising method for clean H 2 O 2 production. However, the efficiency of conventional piezocatalysts is limited by the undesirable low piezoelectricity. Herein, novel piezocatalysts composed of La, Sr, Co (Fe) in simple single perovskites (La 0.5 Sr 0.5 FeO 3-δ and La 0.5 Sr 0.5 CoO 3-δ ) and Ruddlesden-Popper (R-P) type perovskites (LaSrFeO 4-δ and LaSrCoO 4-δ ) are developed for piezocatalytic H 2 O 2 production. Results indicate that Fe-containing catalysts outperform Co-containing counterparts and the unique R-P perovskite oxides demonstrate significantly enhanced piezocatalytic performance than the corresponding single perovskites. For example, via piezocatalysis, the LaSrFeO 4-δ exhibits H 2 O 2 yields of 548 (in 10 % ethanol) and 247 µmol g −1 h −1 (without sacrificial agent), improved by a factor of 1.14, 4.94, or 21.73 compared to La 0.5 Sr 0.5 FeO 3-δ , LaSrCoO 4-δ , or La 0.5 Sr 0.5 CoO 3-δ , respectively. The piezoelectricity is an overwhelming factor in determining the H 2 O 2 generation. Furthermore, the piezoelectricity and oxygen vacancy (OV) content is well correlated. The R-P phase with lower OV exhibits a higher piezoelectricity because of the eliminated pining effect to the polarization domain reversion. Mechanism exploration suggests that H 2 O 2 formation stems from the efficient O 2 reduction via a 2-electron transferring pathway, during which the piezoelectric polarization drives the charge separation and transportation, favoring the redox reactions.
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高影响因子
CATALYSIS TODAY
·
2024
·
IF 5.2
Gongheng Zhang,Fengxiang Yin,Gideon Kofie,Qiuyue Gao,Jie Zhang,Guoru Li,Biaohua Chen
ZIF-67(CoFe) was synthesized using the solvothermal method , and the precursor of ZIF-67(CoFe)/xC-yIL was obtained by grinding the mixture of ZIF-67(CoFe), [BMIM][NTf 2 ] ionic liquid (IL), and carbon black. A series of ZIF-67(CoFe)/xC-yIL-T catalysts were prepared by calcining the precursor at different temperatures. The structure of the catalysts was examined using XRD , TEM, BET and XPS analysis. The results show that the high-temperature treatment of the precursor contributes to the formation of the structure of the N, S-co-doped carbon-coated nanoparticles . The introduction of ionic liquid increases the specific surface area of the catalysts and exposes more active sites. At the same time, as a sulfur source, ionic liquid forms a C-S bond, which is conducive to improving ORR activity. The optimal ORR half-wave potential and limited current density of ZIF-67(CoFe)/1.5 C-45IL-600 are 0.87 V vs. RHE and 4.64 mA cm -2 , respectively, in 0.1 mol L −1 KOH.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qianlin Huang,Puzhen Zhao,Weiwei Wang,Lu Lv,Weiming Zhang,Bingcai Pan
Cost-efficient and durable manganese-based catalysts are in great demand for the catalytic elimination of volatile organic compounds (VOCs), which are dominated not only by the nanostructures but also by the oxygen vacancies and Mn–O bond in the catalysts. Herein, a series of nanostructured Co–Fe-doped-δ-MnO2 catalysts (Co–Fe-δ-MnO2) with high dispersion were in situ fabricated by employing metal–organic-frameworks (MOFs) as reducing agents, dopants, and templates all at the same time. The as-obtained Co–Fe-δ-MnO2-20% catalyst exhibited robust durability and high catalytic activity (225 °C) for toluene combustion even in the presence of 5 vol % water vapor, which is 50 °C lower than that of pristine δ-MnO2. Various characterizations revealed that the homogeneously dispersed codoping of Co and Fe ions into δ-MnO2 promotes the generation of oxygen vacancies and weakens the strength of the Mn–O bond, thus increasing the amount of adsorbed oxygen (Oads) and improving the mobility of lattice oxygen (Olatt). Meanwhile, due to successfully inheriting the framework structures of MOFs, the obtained catalyst exhibited a high surface area and three-dimensional mesoporous structure, which contributes to diffusion and increases the number of active sites. Moreover, in situ DRIFTS results confirmed that the toluene degradation mechanism on the Co–Fe-δ-MnO2-20% follows the MVK mechanism and revealed that more Oads and high-mobility Olatt induced by this novel method contribute to accumulating and mineralizing key intermediates (benzoate) and thus promote toluene oxidation. In conclusion, this work stimulates the opportunities to develop Co–Fe-δ-MnO2 as a class of nonprecious-metal-based catalysts for controlling VOC emissions.
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