CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chong Xu,Yiqing Jiang,Jiahui Yang,Weimin Wu,Xing Qian,Linxi Hou
Box-structured nanomaterials with complicated surface texture, whose morphologies can be adjusted through changing mass ratios of reactants, are attractive in the field of electrochemical energy conversion. Herein, we report the shape-controllable synthesis of MoS 2 doped cobalt iron sulfide (Co-Fe-MoS x ) hollow nanoboxes with three different mass ratios of cobalt iron Prussian-blue-analog (Co-Fe PBA) nanocubes to (NH 4 ) 2 MoS 4 and their applications in dye-sensitized solar cells (DSSCs). As the increment of MoS 4 2− in system, the surface of Co-Fe-MoS x became rough with bushy embedded nanosheets. Benefiting from the three-dimensional nanostructure with more exposed edge sites and appropriate doped ratio, the Co-Fe-MoS x -2 hollow nanoboxes performed rough shells, well-defined interior voids, large specific surface areas and outstanding catalytic actives. By contrast, the sulfide of Co-Fe PBA (Co-Fe-S) and bare MoS 2 showed bad morphology and poor catalytic performance. It is notable that the DSSC with Co-Fe-MoS x -2 showed a much higher power conversion efficiency (PCE) of 9.63% than that of Pt based cell (8.23%) under AM 1.5G irradiation.
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Small
·
2025
·
IF 12.1
Haiyang Shi,Lei Zhang,Xinhua Huang,Qingquan Kong,Abdukader Abdukayum,Yingtang Zhou,Guoyou Cheng,Sanshuang Gao,Guangzhi Hu
The design and fabrication of nanocatalysts with high accessibility and sintering resistance remain significant challenges in heterogeneous electrocatalysis. Herein, a novel catalyst is introduced that combines electronic pumping with alloy crystal facet engineering. At the nanoscale, the electronic pump leverages the chemical potential difference to drive electron migration from one region to another, separating and transferring electron-hole pairs. This mechanism accelerates the reaction kinetics and improves the reaction rate. The interface electronic structure optimization enables the CoFe/carbon nanotube (CNT) catalyst to exhibit outstanding oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance. Specifically, this catalyst achieves an ORR half-wave potential (E₁/₂) of 0.895 V, outperforming standard Pt/C and RuO₂ electrocatalysts in terms of both specific activity and stability. It also demonstrates excellent electrochemical performance for OER, with an overpotential of only 287 mV at a current density of 10 mA cm⁻ 2 . Theoretical calculations reveal that the carefully designed crystal facets reduce the energy barrier of the rate-determining steps for both ORR and OER, optimizing O₂ adsorption and promoting the oxygen capture process. This study highlights the potential of developing cost-effective bifunctional ORR–OER electrocatalysts, offering a promising strategy for advancing Zn–air battery technology.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hongbin Chen,Zhongye Yu,Weikun Sun,Tao Li,Jian Zhang,Zumin Qiu,Mohammad Younas
In this work, 2LDH-CoFe 2 O 4 @BHC catalyst was prepared by modifying magnetic corncob-based hydrochar (CoFe 2 O 4 @BHC) with Co/Fe layered double hydroxide (Co/Fe-LDH), which was used to activate peroxymonosulfate (PMS) for tetracycline (TC) degradation. 2LDH-CoFe 2 O 4 @BHC demonstrated effective activation of PMS and rapid removal of TC (100 %) within 10 min by leveraging structural modulation and synergistic interactions among multiple components. In contrast, BHC (26.02 %), CoFe 2 O 4 (59.25 %), and CoFe 2 O 4 @BHC (61.88 %) presented poor removal efficiency. Furthermore, it was shown that both the free radicals (SO 4 •- ) and non-free radicals ( 1 O 2 ) were essential in the degradation process, and the catalytic mechanism was revealed to be a synergistic process with the characterization results from in-situ Raman, electrochemical characterization, and X-ray photoelectron spectroscopy (XPS). The catalytic performance of 2LDH-CoFe 2 O 4 @BHC was also evaluated using a self-developed fixed-bed reactor, demonstrating its strong stability and resistance to interference during long-term operation. The potential degradation pathway of TC in the 2LDH-CoFe 2 O 4 @BHC + PMS system was suggested based on the quadrupole time-of-flight mass spectrometry (QTOF/MS) findings. It was found that the toxicity of the intermediates produced by TC degradation significantly reduced. This study presented an insight for the decomposition of organic pollutants by synthetic biochar-loaded catalysts.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Lina Zhang,Ziren Wan,Jia Deng,Fangzhou Li,Jingqi Dong,Wulin Yang,Shaodong Xie,Guanghe Li,Fang Zhang
The catalytic membrane, combining confinement effect with advanced oxidation processes , exhibits great potential as an efficient technology for removing contaminants and mitigating membrane fouling . Herein, the Prussian blue analogues (PBAs) functionalized graphene oxide (GO) membranes, referred as PGMs, was successfully fabricated. It exhibited a package-like confined structure where Co–Fe PBAs were encapsulated within interconnected GO nanosheets . The surface properties, internal structure as well as the catalytic performance of PGMs were controlled by adjusting the amount of Co–Fe PBAs anchored on GO nanosheets . The designed PGM as efficient peroxymonosulfate activator exhibited exceptional catalytic performance, achieving complete removal of bisphenol A (BPA) with a retention time of 31 ms. The corresponding first-order rate constant was 6000 min −1 , which surpassed conventional batch system by four orders of magnitude (0.2194 min −1 ). Moreover, the redox cycle involving Fe 2+ and Co 3+ , coupled with the effective suppression of ion leaching from Co–Fe PBAs nanoparticles (<10 μg/L) through GO protective layers, ensured the stable catalytic performance of PGM over 144 h. This study employs a novel approach to confine catalytic nanoparticles within two-dimensional nanosheets, demonstrating the potential applications of the resulting confined membrane in water treatment.
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Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 4
·1095-1102
·
IF 6.367
Fen Li,Jinxia Li,Lihui Zhou,Sheng Dai
Metal–organic frameworks (MOFs) have recently emerged as one of the most promising electrocatalysts for oxygen evolution reaction (OER) due to their abundant metal sites and porous structures. However, the limited modulation of the single-metal sites of MOF-based catalysts restricts further promotion of their catalytic performance. In this work, we have developed a composite Co–Fe-based MOF catalyst based on Co–BDC (1,4-benzenedicarboxylate) and Fe–BDC, which modulated the electronic structure via the construction of the heterogeneous interfaces of Co–BDC and Fe–BDC. Enhanced OER performance was achieved in the composite Co–Fe–BDC catalyst, far more exceeding that of the counterpart Co–BDC or Fe–BDC. In addition, it was found that additional ultrasonic treatment effectively facilitated the dispersion of Fe–BDC on Co–BDC, as compared to the composited MOF obtained via physical mixture or magnetic stirring. The composite Co–Fe–BDC catalyst prepared via the ultrasonic-assisted one-pot synthesis exhibited an overpotential of 295 mV at a current density of 10 mA cm−2, which was even superior to that of the commercial RuO2 catalyst, while holding a lower cost and excellent stability. Insights gained in this study may shed new lights on heterogeneous interfaces and composition strategy of MOF-based electrochemical catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dan Yu,Jiahong He,Taiping Xie,Qiang Xu,Quanxi Zhu,Jun Yang,Jibin An,Feng Ye,Jiankang Wang,Bin Xiang
It is of significant to explore activation mechanism of peroxymonosulfate (PMS) for development of more active and robust metal oxide catalyst. Here, we discover a key role of Sr-O bond in boosting the catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 perovskite. In this catalytic system, oxygen vacancy, Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles synergistically enhanced catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 for antibiotic degradation with 100 % Florfenicol (FF) removal in 27 min. Moreover, this catalyst presented excellent stability although oxygen vacancy had a decrease after reuse. The influential factors including coexisting anions on FF degradation were systematically studied. Comparative experiments and theoretical calculation indicate Sr-O ionic bond provides electrons for Co-O and Fe-O covalent bonds to accelerate Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles for PMS activation . Finally, the FF degradation pathway over SrCoFe perovskite/PMS system was identified by LC-MS/MS.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Dehao Kong,Yong Wang,Jiayin Han,Yuan Gao,Fengrong Liu,Weirong Zhou,Yubing Gao,Geyu Lu
Triethylamine monitoring plays a vital role in industrial safety and marine environmental protection. Co 3 O 4 has been proved to be a promising sensitive material for triethylamine detection. Promoting gas reactions on the surface of sensitive materials is the key to realizing high-performance gas sensors. In this work, MgO microrods were used as sacrificial templates to prepare nanosheet-assembled hollow microtubular Co-Fe bimetallic oxides. The large specific surface area, small crystallite size, and stretched lattice of Co-Fe bimetallic oxides boosted surface gas reactions and improved the response to triethylamine vapor. The modulation in the energy band structure caused by doping-occupied sites of iron on the gas-sensing properties was also considered. The preferential occupation of tetrahedral sites by multivalent iron reduced the work function and band gap of the material, thus enhancing the formation of ion-adsorbed oxygen. In these cases, the sample with about 20 % iron content (CF2) showed the optimum triethylamine sensing performance at 195 °C, with a detection limit as low as 1 ppm, a gas response of 10.9 for 100 ppm triethylamine, and a 58 % shorter recovery time. In addition, it also exhibited excellent selectivity and repeatability. The gas adsorption model was additionally used to analyze the response and recovery process from an energy perspective. This work contributes insights into the sensitivity enhancement and response-recovery process modulation of spinel oxide gas sensors, mainly in terms of crystal structure and doping sites.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Junlong Feng,Le Hu,Xiaowei Wu,Ziqin Liu,Kaiquan He,Pu Hu,Chaoqun Shang
The uncontrollable Li dendrite accumulation accompanied by low Coulombic efficiency severely hampers the sustainable and practical application of lithium metal batteries (LMBs). To tune the uneven Li + flux caused by irregular pores on commercial separator and realize modulated Li + plating/stripping behaviors, in this work, we report the modification of commercial polypropylene separator with etched Co/Fe-based Prussian blue analogue (PP@PBA-X, X represents the HCl etching time). The optimal PBA-4 with acid etching for 4 h possesses regulated micro-/meso-/macro-porous structure, which ensures homogeneous Li + flow of PP@PBA-4 with high Li + transference number of 0.76 and further hinders the growth of Li dendrites. With the assistance of PP@PBA-4, the Li||Li cell shows stable cycling performance for 500 h at 1 mA cm −2 with fixed specific capacity of 1 mAh cm −2 , while the full Li-S battery with limited Li supply delivers favorable cycling stability for almost 430 cycles with 60 % capacity retention and high Coulombic efficiency of 99.95 % at current density of 500 mAg −1 .
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高影响因子
Materials
·
2024
·
IF 3.1
Xiaofei Hao,Ran Wang,Xiumin Tan,Xiufeng Zhang,Xupo Liu,Zhaoyang Wu,Dongli Yuan
Fabricating efficient oxygen evolution reaction (OER) electrocatalysts is crucial for water electrocatalysis. Herein, the spinel-type high-entropy oxides of (Co, Fe, Mn, Ni, Cr) 3 O 4 were synthesized through the high-temperature calcination approach. The influences of calcination temperatures on structures and electrochemical properties were investigated. The optimized catalyst of HEO-900 contains the hybrid structure of regular polyhedrons and irregular nanoparticles, which is beneficial for the exposure of electrochemically active sites. It was identified that the abundant high-valence metal species of Ni 3+ , Co 3+ , Fe 3+ , Mn 4+ , and Cr 3+ are formed during the OER process, which is generally regarded as the electrochemically active sites for OER. Because of the synergistic effect of multi-metal active sites, the optimized HEO-900 catalyst indicates excellent OER activity, which needs the overpotential of 366 mV to reach the current density of 10 mA cm −2 . Moreover, HEO-900 reveals the prominent durability of running for 24 h at the current density of 10 mA cm −2 without clear delay. Therefore, this work supplies a promising route for preparing high-performance multi-metal OER electrocatalysts for water electrocatalysis application.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiyang Kang,Ziqian Jin,Huaiqi Peng,Zihao Cheng,Lijie Liu,Xin Li,Lixia Xie,Jianmin Zhang,Yutao Dong
Lithium-sulfur (Li-S) batteries are currently only in the basic research stage and have not been commercialized, which is mainly affected by the poor conductivity of sulfur/lithium sulfide (S/Li 2 S), volume expansion effect of sulfur and the shuttle effect of lithium polysulfides (LiPSs). Herein, a three dimensional (3D) carbon nanotubes (CNTs) decorated cubic Co 9 Se 8−x /FeSe 2−y (0 ＜ x ＜ 8, 0 ＜ y ＜ 2) composite (Co 9 Se 8−x /FeSe 2−y @CNTs) is developed, and used as the functionalized mediator on polypropylene (PP) in Li-S batteries. Benefiting from the good electrical conductivity, large number of Se vacancies and the triple block/adsorption/catalytic effects of Co 9 Se 8−x /FeSe 2−y @CNTs, the cell with Co 9 Se 8−x /FeSe 2−y @CNTs//PP modified separator delivers a high reversible capacity (1103.5 mA h g −1 ) at 1C after three cycles activation at 0.5C and remains 446 mA g h −1 after 750 cycles with a 0.08% capacity decay rate each cycle. Moreover, at 0.2C, a high areal capacity of 3.63 mA h cm −2 after 100 cycles with a high sulfur loading of 4.1 mg cm −2 is obtained. The in-situ XRD tests revealing the transition path of α -S 8 → Li 2 S → β -S 8 during the first charge–discharge process, then β -S 8 → Li 2 S → β -S 8 conversion reaction in the next cycles, and firstly determine the sulfur-selenide active intermediates (Se 1.1 S 6.9 ) during cycles. The work provides a new insight into the development of bimetallic selenide composites by defect engineering with highly adsorptive and catalytic properties for Li-S batteries.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Aotian Gu,Chunhui Gong,Manli He,Kaiwei Chen,Xinyu Zhou,Peng Wang,Kai Chen,Yan Jiao,Yi Yang
Advanced oxidation processes activated by transition metal have attracted much attention for their excellent performance in the removal of organic pollutants , but the development of efficient and environmentally benign catalysts is still a significant challenge. In this work, carbon shell encapsulating Co/Fe sulfide nanoparticles (Co/Fe@SC X ) were synthesized by pyrolysis of the resorcinol-formaldehyde (RF) coated MIL-101 @ZIF-67 bimetal Metal-organic frameworks (MOFs). In the degradation of TCP , Co/Fe@SC 600 exhibited the highest TCP removal rate (97.33%) and reaction rate constant (k obs ) (0.169 min −1 ), as well as the mineralization rate of up to 60.19%. Compared to other prepared catalysts, Co/Fe@SC 600 not only possessed excellent catalytic activity, but also exhibited the lowest Co ion leaching concentration, good stability and high resistance to environmental factors. Further studies showed that the non-radical pathway dominated by 1 O 2 contributed most to the TCP degradation, and the radicals also played the indispensable role. The potential TCP degradation pathways in the reaction system was also investigated by analyzing the intermediate products during the degradation process. Overall, this study may provide some interesting insights into the design of advanced catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yan Dong,Sheng Liu,Wenjing Deng,Hao Zhang,Guangyi Liu,Xiaolei Wang
Heteroatom doping is a possible way to regulate the catalytic capability of electrocatalysts for hydrogen evolution reaction (HER). This work focuses on the development of bimetallic Cobalt-Iron sulfide ultrathin nanosheets supported on the graphitic carbon nitride (g-C 3 N 4 ) catalyst as efficient HER electrocatalysts (CoS 2 /FeS 2 /CN) with good stability at wide pH value. The ultrathin nanosheet exposes more active sites and enhances the catalyst activity. Electrochemical experiments demonstrate that adding g-C 3 N 4 and Fe to CoS 2 increases its catalytic activity and stability. Furthermore, g-C 3 N 4 and Fe co-doped with CoS 2 can modulate electronic structures on the interface. The CoS 2 /FeS 2 /CN exhibits outstanding HER performance, reaching a current density of 10 mA cm −2 with overpotentials of only 76.5 mV in an acidic solution and 175.6 mV in an alkaline solution. It also demonstrates exceptional durability, superior to commercial platinum/carbon catalysts. This work introduces a promising approach for designing low-cost, high-performance HER electrocatalysts with a wide pH range.
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