ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Lu Chen,Li−Li Cui,Zizhun Wang,Xingquan He,Wei Zhang,Tewodros Asefa
Efficient, durable, nonprecious metal-based catalysts for electrochemical reactions involving oxygen are needed to advance the widespread use of fuel cells and Zn-air batteries. In this work, hybrid materials composed of bimetallic (Co and Fe) sulfide (Co8FeS8) nanoparticles supported on N,S-doped carbon microparticles that can serve as dual-function oxygen electrocatalysts are synthesized. The synthesis of the materials is performed by preparing and then pyrolyzing silica-protected Fe- and Co-modified, S-containing polyphthalocyanine at different temperatures. The materials are named (Fe,Co)SPPc-T-sp, where T denotes the pyrolysis temperature and sp represents the silica protection applied for their synthesis. Among them, the material synthesized at 900 °C, denoted (Fe,Co)SPPc-900-sp, shows superb electrocatalytic activities in an alkaline solution both toward the oxygen reduction reaction (ORR), with a half-wave potential (E1/2) of 0.830 V vs RHE, and toward the oxygen evolution reaction (OER), with a current density of 10 mA cm–2 at an overpotential (η10) of 353 mV. The catalytic activities of this material for both reactions are comparable with those of the respective benchmark, precious-metal-based catalysts, namely, Pt/C (20 wt %) and RuO2, respectively. An alkaline Zn-air battery assembled using (Fe,Co)SPPc-900-sp as an air electrode delivers a high peak power density (158.6 mW cm–2) and outstanding charge–discharge cycling stability (for over 50 h). These catalytic performances are better than those of the corresponding battery containing Pt/C and RuO2 electrocatalysts. This work also offers a facile synthetic strategy for the fabrication of robust, inexpensive dual-function electrocatalysts for Zn-air batteries.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiwen Tao,Zhengguang Zhang,Zheng Li,Shuangsheng Xiong,Shengmei Wang,Faming Gao,Chen Wang,Li Hou
Potassium-ion batteries (PIBs) have become the desirable alternatives for lithium-ion batteries (LIBs) originating from abundant reserves and appropriate redox potential, while the considerable radius size of K+ leading to poor reaction kinetics and huge volume expansion limits the practical application of PIBs. Hybridization of transition-metal phosphides and carbon substrates can effectively optimize the obstacles of poor conductivity, sluggish kinetics, and huge volume variation. Thus, the peapod-like structural MxPy@BNCNTs (M = Fe, Co, and Ni) composites as anode materials for PIBs were synthesized through a facile strategy. Notably, the unique architecture of B/N codoped carbon nanotube array as fast ion/electron transfer pathways effectively improves the electronic conductivity of composites. The MxPy nanoparticles (NPs) are encapsulated in BNCNTs with an amorphous carbon layer (5–10 nm), which discernibly alleviate the volume changes during potassiation/depotassiation. In conclusion, the composites show a commendable cycling performance, possessing reversible capacities of 111, 152, and 122 mA h g–1 after 1000 cycles at 1.0 A g–1 with a negligible capacity loss for FeP@BNCNT, CoP/Co2P@BNCNT, and Ni2P@BNCNT electrodes, respectively. Especially, after 1000 cycles at 2.0 A g–1, the CoP/Co2P@BNCNT electrode still possesses a capacity of 87.9 mA h g–1, demonstrating excellent rate performance and long-term life. This work may offer an innovative and viable route to construct a stable architecture for solving the issue of poor stability of TMP-based anodes at a high current density.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shitong Liu,Jun Wang,Yang Liu,Baojun Yang,Chunxiao Zhao,Shichao Yu,Chenxu Wang,Guanzhou Qiu,Junwu Liu,Yingchun Fang
To alleviate the environmental pressure caused by the continuous accumulation of solid waste red mud (RM) and organic pollutants, we developed a magnetic-supported catalyst derived from RM-based Fe-Co Prussian blue analogues (RM-Co PBA-D) using RM as the iron source and carrier. Then, the catalyst was used to activate peroxymonosulfate (PMS) under visible light for the degradation of tetracycline (TC) and rhodamine B (RhB). Due to the superior dispersion, strong visible light response, and high photo-generated carrier separation efficiency of the RM-Co PBA-D, the RM-Co PBA-D/PMS/Vis system could completely degrade both TC (10 mg/L) and RhB (20 mg/L) in 30 min, with mineralization efficiencies as high as 70.12 % and 60.59 %, respectively. Several reactive oxygen species (ROS) such as SO 4 ⋅− , ⋅OH − , ⋅O 2 − , 1 O 2 , and h + were involved in the degradation process, with SO 4 ⋅− and 1 O 2 playing a dominant role. More importantly, except for the production of ROS, the regeneration of active sites (Co 2+ /Fe 2+ ) mediated by photo-generated carriers was also a critical factor in enhancing the removal of organic pollutants. In addition, the constructed system demonstrated significant potential for practical applications, which was attributed to the stable structure and catalytic performance of the catalyst as well as the strong ability of the system to resist interference by impurity anions and detoxify organic pollutants.
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Nanoscale
·
2019
·Vol. 11
·期 18
·8950-8958
·
IF 6.97
Hui Yang,Shunxing Li,Huiwu Yu,Fengying Zheng,Luxiu Lin,Jie Chen,Yuehai Li,Ye Lin
Control of the active sites/centers plays an important role in the design of novel electrode materials with unusual properties and achievement of sensors with high performance. In this study, three-dimensional (3D) freestanding multi-doped hollow carbon spheres (N–Co–Fe–HCS) with a layer thickness of 30 nm, which contained multiple active sites of the heteroatom N and transition metals (Co and Fe), were synthesized via a simple template method (with SiO2 as the template) and cost-efficient in situ self-polymerization, self-adsorption/reduction and carbonization strategies. Moreover, a series of hollow carbon sphere composites of the same family (N–HCS, N–Co–HCS and N–Fe–HCS) were prepared by this sensible process using the same method and precursors but different doping elements. These differences lead to different active sites/centers from hollow carbon spheres and improved electrocatalytic activities for dihydroxybenzene isomers. Furthermore, N–Co–Fe–HCS as an electrochemical sensor exhibited excellent simultaneous qualitative and quantitative determination performance for catechol (CC) and hydroquinone (HQ). The detection limit and the linear range were 75 nmol L−1 and 0.5–500 μmol L−1 for CC and 80 nmol L−1 and 0.5–1500 μmol L−1 for HQ, respectively. The interference from the components coexisting in river water on the detection of CC and HQ was not observed. These results indicate that high-performance electrochemical sensors can be constructed by in situ multi-element doping into electrode materials to achieve multi-active sites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Ying Lei,Haiyan Zhang,Changsheng Yang,Xiang Peng,Yao Xu,Yangming Yu
P2-Na 0.67 Mn 0.8 Fe 0.1 Ni 0.1 O 2 (MNF811) has garnered considerable attention due to its low cost and high energy density, while the poor structural and air stability and lattice oxygen evolution lead to undesirable electrochemical performance. Here, a NiFe 2 O 4 surface coating triggering a Ni/Fe co-doping strategy has been reported to suppress lattice oxygen evolution, eliminate poor air stability and mitigate the detrimental P2-OP4 phase transition. Furthermore, the NiFe 2 O 4 coating layer with air stability protects P2-Na 0.67 Mn 0.8 Fe 0.1 Ni 0.1 O 2 (MFN811@NF) cathode from reacting with moist air, and endows the P2-Na 0.67 Mn 0.8 Fe 0.1 Ni 0.1 O 2 electrode with three-dimensional fast sodium-ion diffusion channels and stable cathode/electrolyte interface (CEI), benefiting from the NiFe 2 O 4 coating layer. Ni/Fe co-doping by increasing the hybridization of the O(2p)- transition metal (TM) (3d-eg*) states, stabilizes excited state lattice oxygen and suppresses the irreversible migration of TM ions and the Jahn-Teller effect, mitigating adverse phase transitions and inhibiting structural degradation. In comparison to the Na 0.67 Mn 0.8 Fe 0.1 Ni 0.1 O 2 electrode, the initial discharge capacity of the 10 % NiFe 2 O 4 -coated P2-Na 0.67 Mn 0.8 Fe 0.1 Ni 0.1 O 2 (MFN811@NF-10) cathode was 114.4 mA h g −1 in the voltage range of 1.5–4.3 V at a high current density of 5C, with a capacity retention rate of 66.7 % after 1000 cycles. Eventually, the ex-situ X-ray Powder Diffraction (XRD) and ex-situ X-ray photoelectron spectroscopy (XPS) revealed that NiFe 2 O 4 coating layer and Ni/Fe co-doping can prevent structural/chemical transformations and stabilize excited state lattice oxygen to realize high specific capacity. Density functional theory (DFT) calculations also confirm that Ni/Fe co-doping stabilizes lattice oxygen through the strengthening of transition metal–oxygen bonds. This dual modification strategy may provide crucial insights for the development of high-performance sodium-ion battery cathode materials.
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高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Haoran Tu,Yu Yan,Dong Cai,Jingxue Wang,Xiaoyun Shang,Hui Tian,Feng Su,Xiaobo Du
Nanocrystalline Nd 2 (Fe, Co) 14 C materials were synthesized by a mechanochemical method. Ball milling in organic solvent (hydrocarbon), Nd 15 Fe 80.6 Co 4 B 0.4 alloy disproportionated into NdH 2+δ , α-Fe (Co) and Fe 7 C 3 phases. H 2 was released from the NdH 2+δ and Nd 2 (Fe, Co) 14 C hard magnetic powders were obtained during the subsequent annealing under vacuum. The effects of hydrocarbon solvent species and annealing condition on phase evolutions and magnetic properties were studied systematically. It is found that the n-hexane is more easily decomposed and makes the disproportion reaction more completed than other common hydrocarbons, which favor the formation of permanent magnetic Nd 2 (Fe, Co) 14 C phase. Scanning electron microscope and Henkel plot analysis verified microstructural and intergranular exchange coupling can be well controlled by the annealing process. The optimum magnetic properties with remanent magnetization 4π M r of 7.35 kG, maximum energy product ( BH ) max of 12.3 MGOe and coercivity i H c of 16.2 kOe were obtained in the sample ball milled in n-hexane and annealed at 800 °C for 2 min with a heating rate of 10 °Cs −1 . The systemical study shows that this method is a promising way to synthesize nano-sized Nd 2 (Fe, Co) 14 C hard magnetic powder suitable for the manufacture of bond permanent magnet.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Yuxiang Ou,Xiangjian Liao,Shiquan Chen,Xingyu Liu,Rui Li,Yonglin Chen,Yifei Wang,Zixuan Wu,Aiping Huang,Xianzhe Liu,Jianyi Luo
The non-invasive detection of acetone in exhaled breath via gas sensors offers a simple and efficient strategy for the auxiliary diagnosis of diabetes. Spinel ferrites have emerged as promising candidates for sub-ppm acetone detection due to their outstanding physicochemical and electronic properties. Despite the development of diverse spinel ferrites, the intrinsic correlation between cation type (i.e., M 2 + in the MFe 2 O 4 structure) and these materials’ gas-sensing properties has not been systematically elucidated. In this study, spinel ferrites with different metal ions (MFe 2 O 4 , M = Fe, Co, Ni and Zn) were synthesized via a facile one-step solvothermal method. The effects of cation type on the crystal structure, microstructural features, and acetone-sensing performance of these ferrites were systematically studied. It demonstrates that the cation type exerts a significant influence on the grain size, morphological and microstructural characteristics, and gas-sensing kinetics of these ferrites, thereby regulating their overall acetone-sensing performance. Notably, the NiFe 2 O 4 sensor exhibits superior acetone-sensing properties toward 1.0 ppm acetone at its optimal operating temperature, including a high response value, a low detection limit, excellent humidity tolerance, outstanding selectivity, and long-term stability. Furthermore, the NiFe 2 O 4 sensor can effectively distinguish acetone concentration differences in exhaled breath between healthy individuals and diabetic patients (using simulated samples). These results clarify the intrinsic correlation between cation type and acetone-sensing performance of spinel ferrites, providing practical guidance for the rational design of high-performance acetone-sensing materials and promoting their application in breath-based auxiliary diagnosis of diabetes.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Maolin Li,Quanxi Lu,Zhichao Dong,Sijie Liu,Rong Tan
5-Hydroxymethylfurfural (HMF), which is obtained from fructose dehydration, can be oxidized to valuable biomass-based platform chemicals, such as 2,5-furandicarboxylic acid (FDCA), 2,5-dicarbonylfuran (DFF) and 5-formyl-2-furancarboxylic acid (FFCA). However, the complex reactions of dehydration and oxidations make it is still challenging to obtain these chemicals from fructose. Herein, a dual single-atomic Fe/Co composed of isolated FeN 6 and CoN 5 sites supported on N-doped carbon (Fe/Co-NC) was constructed to efficient conversion of fructose to FDCA, DFF or FFCA through a two-step strategy. Owing to the Lewis acid sites in Fe/Co-NC, fructose can efficiently convert to HMF with an isolated yield of 91.70 % at 145 °C in dimethyl sulfoxide (DMSO). Furthermore, synergistic effect between Fe and Co atoms, which results in charge redistribution, can also promote the adsorption and activation of HMF and O 2 for efficient oxidation. Attributing to the various ability of Fe/Co-NC to activate O 2 in different solvents, superoxide radicals (·O 2 − ) generated in MeCN result in 97.70 % yield of DFF, while peroxyl radicals (·OOH) generated in water lead to 97.29 % yield of FDCA. Adding DMSO in aqueous system seriously hinders the reaction rate (rate constant from 0.0022 to 0.0008 min −1 ) due to solvation of HMF by DMSO, resulting in high yield of FFCA (81.56 %) at 4 h. Therefore, controllable conversion of FDCA, DFF or FFCA from fructose is achieved over Fe/Co-NC, and the readily recovered method and good stability of the catalyst also indicate the prospect for continuous production of the above chemicals from fructose in the future.
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高影响因子
ACS Omega
·
2019
·
IF 2.584
Sihao Wang,Qingyu Luo,Yingfang Zhu,Shaolong Tang,Youwei Du
Synthesis of electrocatalysts for oxygen reduction reaction (ORR) with not only prominent electrocatalytic performance but also a low amount of Pt is the urgent challenge in the popularization of fuel cells. In this work, through a facile synthetic strategy of spray dehydration on a solid surface and annealing process, we demonstrate the first manufacture of quaternary structurally ordered PtM3 (M = transition metal) intermetallic nanoparticles (NPs), Pt(Fe, Co, Ni)3, in order to lower the content of Pt. The atomic contents of Pt, Fe, Co, and Ni are equal and the chemical structure of Pt(Fe, Co, Ni)3 is a cubic L12-ordered structure. L12-Pt(Fe, Co, Ni)3/C electrocatalysts exhibit enhanced electrocatalytic performance toward ORR with mass activity (MA) 6.6 times higher than the commercial Pt/C and a minimal loss of 17% in MA and 1.5% loss in specific activity (SA) after 10 000 potential cycles at 0.9 V. Furthermore, the stability behavior is confirmed to be attributed to the coaction of particle sizes and the ordering effect. Compared with traditional Pt-based electrocatalysts in the stoichiometric forms of Pt3M and PtM, L12-Pt(Fe, Co, Ni)3 intermetallic NPs exhibit excellent performance and higher cost effectiveness. Moreover, this work also proposes a facile and effective synthetic strategy for manufacturing multicomponent Pt-based electrocatalysts for ORR.
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高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Qingzhi Zhu,Xiang Luo,Haifeng Li,Jiabao Zang,Jihui Sun,Xutao Yan,Yijian Liu
Pure magnetic materials always exhibit mediocre microwave absorption performance due to the poor impedance matching and negligible dielectric loss capability. In this study, a novel porous aggregates of multi-element doped Fe 3 O 4 /(Fe, Co, Ni, Cu) alloys (denoted as DF/alloys) composite which is composed of magnetic/magnetic heterostructure with excellent microwave absorption performance were prepared. By reducing part of the ferrimagnetic spinel into ferromagnetic alloy, the saturation magnetization M s was enlarged which is beneficial to exceeding the Snoek′s limit, and the magnetic loss capability was further enhanced significantly. Furthermore, the abundant heterogeneous interfaces in the DF/alloys composites have greatly improved the dielectric loss capability and balanced the complex permittivity and the complex permeability, and achieved superior impedance matching of the magnetic/magnetic heterogeneous DF/alloys composites. When the loading ratio (DF/alloys to paraffin mass ratio) was only 30 wt%, the widest effective absorption bandwidth ( EAB ) reached 5.58 GHz (3.2 mm). when the loading ratio was up to 50 wt%, the widest EAB (6.4 GHz) was achieved at 2.0 mm and the minimum reflection loss ( RL min ) reached −49.3 dB at 4.15 GHz. As microwave absorption materials, the DF/alloys composites are extremely promising and competitive.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 4
·1757-1770
·
IF 3.3
Ling Tao,Jiepu Zhang,Fangke Yu
In this study, in order to achieve efficient activation of persulfate, we added MoS2 as a co-catalyst to the iron, cobalt and nitrogen modified biochar (Fe–Co–N–BC) catalytic system. Analytical methods such as scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) demonstrated that the MoS2/Co–Fe–N–BC catalytic materials were successfully prepared. In the MoS2/Fe–Co–N–BC/PMS system, 97.5% of PFOA was removed within 180 min with Kobs of 0.074 min−1. Composites with different mass ratios of MoS2 and Co–Fe–N–BC/PMS in the non-homogeneous PMS system both exhibit excellent catalytic efficiency for TOC removal. In particular, MoS2/Fe–Co–N–BC obtained extraordinary catalytic efficiency through synergistic radical (SO4˙−, ˙OH) and non-radical (1O2, FeIV and FeV) processes, which was proved by the quenching experiments and the EPR testing. The analysis of the activation mechanism reveals that the three redox ion pairs Fe2+/Fe3+, Co2+/Co3+ and Mo4+/Mo6+ simultaneously participated in the activation of PMS, realizing multi-path electron transfer. And MoS2 played an excellent co-catalysis role in promoting the cycling of the valence states of the ions. Compared to Fe3+ and Co3+, the low valence states of Fe2+ and Co2+ can activate PMS more rapidly and produce more ˙OH and SO4˙−. However, the recycling efficiency of Fe2+ and Co3+ in the Fe–Co–N–BC system is low, and the presence of MoS2 improves the efficiency of Fe3+ and Co3+ reduction to Fe2+ and Co2+, respectively. The possible degradation pathways of PFOA were proposed. This study provides some references for the design of polymetallic-doped catalysts to degrade difficult-to-degrade organic pollutants.
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Journal of Physical Chemistry C
·
2013
·
IF 4.814
Xiangdong Wang,Hongbo Yu,Dayin Hua,Shenghu Zhou
PtM (M = Ni, Fe, Co) alloy nanoparticles were synthesized by a liquid phase reduction method employing butyllithium as a reducing agent. The alumina-supported PtM materials were then used as precursors to obtain the Pt-MxOy/Al2O3 catalysts through calcination. The influence of synthesis conditions of PtM alloy nanoparticles and the catalytic performance of the Pt-MxOy/Al2O3 catalysts for p-chloronitrobenzene hydrogenation reaction were investigated. The relevant characterizations such as XRD, XPS, and TEM were conducted for PtM alloy nanoparticles and Pt-MxOy/Al2O3 catalysts, and the result showed that the PtM nanoparticles are uniform alloy. Moreover, compared to PtM alloy nanoparticles, the Pt particle size of Pt-MxOy/Al2O3 using PtM alloy nanoparticle precursors did not increase by calcination, indicating good thermal stability. The catalytic activities of Pt-MxOy/Al2O3 for p-chloronitrobenzene hydrogenation reaction were significantly higher than that of control Pt/Al2O3 catalysts due to its strong Pt-MxOy interaction.
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