CHEMICAL ENGINEERING JOURNAL
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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.
研究领域:
材料科学
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能源转换
·
纳米技术
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yuping Gai,Wei Deng,Junbo Hu,Dan Li,Wenshuo Xie,Xiang Li,Jingjing Zhang,Dewu Long,Fei Jiang
The preparation of stable electrocatalyst for oxygen evolution reaction is of the utmost importance to realize high performance water decomposition reaction . Metal-organic framework (MOF) nanostructures have become promising materials. Herein, we report three kinds of electrocatalysts with different structures and properties for the oxygen evolution reaction, which were constructed by using different binding sites of three kinds of ligands following a mechanism which involved only *O and *OH species as intermediates. CoFeBTC-MOF shows excellent overpotential η = 261 mV at 10 mA cm −2 (1.481 V vs. RHE), Tafel slope of 59.29 mV dec −1 and pretty excellent stability (48 h of continuous testing), making it become one of the best acid-resistant catalysts for oxygen evolution reaction. The DFT calculations show that there are different ways to transfer electrons . In addition, the coupling effect between Co and Fe metals is the key to regulate the electrocatalytic activity , confirming the cooperative catalysis mechanism with a reduced energy barrier.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Results in Chemistry
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2025
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IF 4.2
Weiyan Shi,Xinning Zhang,Xin Yang,Long Bai,Jinsong Yu,Fei Xu,Tai Ye
Recently, enthusiasm for catalysts-based nanozymes in various catalytic systems has been growing significantly. However, the low catalytic capacity of reported enzyme-mimic catalysts has not met the requirements for practical applications. In this work, Co-Fe Prussian blue analogs yolk-shelled nanocubes (Co-Fe PBAs YSHCs) successfully prepared by a template-assisted ion exchange method are demonstrated for efficient AA sensing. The as-prepared Co-Fe PBAs YSHCs display superior and desirable peroxidase-like activity. The unique YSHCs structures can expose large active sites and enhance the stability during the colorimetric sensing process. As a result, the Co-Fe PBAs YSHCs sensing platform can sensitively and accurately determine AA in both colorimetric and smartphone sensing modes, the wide linear ranges for AA were 1–95 μM with a low limit of detection of 0.9 μM. In addition, the Co-Fe PBAs YSHCs sensing platform can be explored for AA detection in human serum samples, yielding satisfactory recoveries. This work provides an ideal method for preparing catalysts and pioneers the investigation of nanozymes with peroxidase-like activity in biosensing platform.
研究领域:
生物传感
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材料科学
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分析化学
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DOI
高影响因子
Nano Energy
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2018
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IF 13.12
Jiahui Chen,Jianwen Liu,Jin-Qi Xie,Huangqing Ye,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
The development of high-performance and cost-effective electrocatalysts is of great significance for hydrogen production by water splitting but remains challenge. Herein, a metal organic frameworks (MOFs) templating approach is proposed to synthesize Co incorporating FeP nanotubes (Co-Fe-P nanotubes) for efficient for hydrogen evolution reaction (HER). The MOFs-derived tubular structure with in situ Co substitution lead to abundant catalytic sites, fast mass and charge transport pathways, and desirable electronic configuration. These beneficial effects enable Co-Fe-P nanotubes efficient HER catalytic activity in a wide pH range, achieving small overpotentials of 86, 138, and 66 mV at a current density of 10 mA cm −2 in 1 M KOH, 1 M phosphate buffer solution (PBS), and 0.5 M H 2 SO 4 , respectively. The catalytic activity of Co-Fe-P nanotubes outperforms most of the reported FeP-based electrocatalysts. Density functional theory calculations further reveal that Co substitution results in increased density of states near Fermi level , boosting the intrinsic electrocatalytic activity of Co-Fe-P nanotubes. This work affords a feasible way to the synthesis of cheap and efficient FeP-based electrocatalysts for HER.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2017
·Vol. 27
·期 27
·1700886
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IF 12.124
Yecan Pi,Qi Shao,Pengtang Wang,Jun Guo,Xiaoqing Huang
The development of bifunctional electrocatalysts for overall water splitting in acidic media is vital for polymer electrolyte membrane (PEM) electrolyzers, but still full of obstacles. Here, highly efficient acidic overall water splitting is realized by utilizing ultrasmall, monodispersed Iridium (Ir)-based nanoclusters (NCs) as the candidate, via a surfactant-free, wet-chemical, and large-scalable strategy. Benefiting from the high specific surface area, clean surface, and strong binding between NCs and supports, the IrM NCs exhibit attractive activities and durability for both oxygen evolution reaction and hydrogen evolution reaction in acidic electrolytes, with IrNi NCs showing the best performance. More significantly, in the overall water splitting, IrNi NCs reach 10 mA cm −2 at a cell voltage of only 1.58 V in 0.5 m H 2 SO 4 electrolyte, holding promises for potential implementation of PEM water electrolysis. This work opens a new avenue toward designing bifunctional “acidic stable” catalysts for efficient overall water splitting.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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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.
研究领域:
材料科学
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电化学
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能源存储
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产品关联
DOI
PubMed
高影响因子
Catalysts
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2023
·Vol. 13
·期 8
·1150
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IF 3.9
Xinying Chen,He Zhang,Shizhe Xu,Xiaoge Du,Kaida Zhang,Chun-Po Hu,Sihui Zhan,Xueyue Mi,Wen Da Oh,Xiao Hu,Ziyong Pan,Yueping Bao
In the current work, a novel Co-Fe bimetallic immobilized cellulose hydrogel bead (CoFeO@CHB) was prepared via in situ chemical precipitation followed by heat treatment and applied for tetracycline (TC) degradation in the presence of peroxymonosulfate (PMS). The characterization results indicated that the Co-Fe particles were evenly distributed within the porous cellulose hydrogel beads, without affecting their morphologies or crystal structures. During the TC degradation, the CoFeO@CHB/PMS system showed a high resistance and stability to different water bodies, and the common anions and natural organic matters showed a limited effect on TC degradation. The chemical quenching experiments (using chemicals to react with specific reactive species) as well as electron paramagnetic resonance (EPR) results showed that CoFeO@CHB can effectively active PMS to generate multiple reactive oxygen species (ROS, such as SO4•−,•OH and1O2), in which the1O2-dominated non-radical pathway played a vital role in TC degradation. Both Co and Fe were proposed as the active sites for PMS activation, and the CoFeO@CHB/PMS system showed a high potential in practical application due to its high selectivity and robustness with much less toxic intermediate products. Furthermore, a long-term continuous home-made dead-end filtration device was constructed to evaluate the stability and application potential of the CoFeO@CHB/PMS system, in which a >70% removal was maintained in a continuous 800 min filtration. These results showed the promising potential for cellulose hydrogel beads utilized as a metal-based nanomaterial substrate for organic degradation via PMS activation.Keywords:hydrogels;peroxymonosulfate;non-radical;tetracycline
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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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.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2023
·
IF 5.5
Shanhai Zhao,Chunhe Li,Kuankuan Ren,Zebo Fang,Ping Fang,Yanyan Zhu,Pengfei Fang
Photothermal catalytic CO 2 reduction is an attractive way to alleviate the current energy crisis, but it is important to prepare catalysts with efficient catalytic capacity. In this work, Prussian blue analogs were firstly prepared, and then calcined to obtain porous transition metal (Ni, Co, Fe) oxides (TMOs). The metal composition of catalysts has great influences on their structures and catalytic properties. Among them, NCF-TMO catalyst shows excellent photothermal catalytic performance, and can produce 2.9 mmol g -1 h -1 CO and 1.6 mmol g -1 h -1 mmol CH 4 at low CO 2 and H 2 concentrations. For the NCF-TMO, its superior catalytic performance mainly benefitted from two reasons: (1) The construction of heterojunction between NiO, Co 3 O 4 and Fe 2 O 3 , which promotes the efficient dynamic processes of charge carriers; (2) The formation of abundant surface reactive active sites facilitates the efficient conversion of CO 2 molecules. This study offers a bright direction for the resource utilization of CO 2 .
研究领域:
材料科学
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环境科学
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催化化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xiangjun Chen,Jinshuo Qiao,Zhenhua Wang,Wang Sun,Kening Sun
The performance and stability of direct carbon solid oxide fuel cells (DCSOFCs) are severely affected by the electrocatalytic activity of their anode materials . In this work, a cobalt doped layered perovskite , (PrBa) 0.95 Fe 1.8−x Co x Nb 0.2 O 5+δ (PBFCo x N, x = 0, 0.1, 0.2, 0.3), is investigated as the anode material for a DCSOFC. Co 3 Fe 7 alloy particles are exsolved on the perovskite substrate under the reduction of carbon, which improves CO chemisorption and electrochemical oxidation . This enhances the electrochemical performance of the anode. The electrolyte-supported cell with a (PrBa) 0.95 Fe 1.6 Co 0.2 Nb 0.2 O 5+δ (PBFCo 0.2 N) anode achieves a peak power density of 525.6 mW cm −2 at 800 °C, fueled by activated carbon. The performance of this anode material is comparable to or exceeds that of previously reported anodes, indicating that the PBFCo 0.2 N anode is a promising option for DCSOFCs.
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DOI
高影响因子
Materials Chemistry Frontiers
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2017
·Vol. 1
·期 10
·2065-2077
·
IF 0
Fu Yang,Bangbang Wang,Hang Su,Shijian Zhou,Yan Kong
Surface defective or heterojunction sites of catalysts generally afford remarkable catalytic activity thanks to their high-surface-energy. Regularly-generating multiple defective sites on the surface of a catalyst is exceedingly promising in many reactions. In this study, we report an unexpected Co/Fe–Co planar hybrid composite nanosheet with serried surface defects including surface biphasic junction sites or defective holes. A facile thermal-induced process was applied to trigger the generation of defective sites on planar Co/Fe–Co hydroxides. Through a controlled thermal process, massive serried CoO nanocrystals were in situ dissolved out of the surface of cobalt hydroxide, while defective surface holes were formed on the Fe-doped Co(OH)2 nanosheets under a prolonged thermal procedure. The morphology and microscale structure of the resulting Co/Fe–Co hybrid 2-dimensional (2D) composites were systematically examined by virtue of various characterization techniques. As expected, the obtained surface defective Co/Fe–Co planar composites showed obviously enhanced catalytic activity in the Fenton-like reaction. Based on a catalytic study, we proved that the CoO nanocrystals densely-distributed on thinlayer Co(OH)2. Uniformly-introduced Fe heteroatoms in the inter-structure of Co(OH)2, along with the formed surface defective holes on Fe–Co hybrid composites, are synergistically responsible for increased catalytic removal efficiency of MB in the presence of peroxomonosulfate.
研究领域:
无机化学
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催化化学
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纳米材料科学
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环境化学
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物理化学
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DOI
DESALINATION
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2026
·
IF 9.9
Yuxuan Zhu,Haikuo Lei,Zengli Dai,Dong Liang,Quan Kang,Hongqing Lv,Huichao Su
A cathodic EMR equipped with highly dispersed Co/Fe-doped CoFeCM achieves 99.4% removal of high-concentration SMX. • FeCoN 6 -like local sites synergistically generate ·OH and O 2 · − for efficient removal. • Chitosan enhances metal anchoring and membrane flexibility, enabling low-cost fabrication. • Continuous-flow EMR realizes electrocatalytic oxidation and membrane separation in one single unit. To address the low efficiency and poor environmental safety of traditional technologies for degrading sulfamethoxazole (SMX), a cathodic electrocatalytic membrane reactor (EMR) was constructed by integrating CoFeCM as the cathode. CoFeCM was fabricated via a scalable mechanical ball milling-hot pressing‑carbonization route using chitosan-modified activated carbon as the substrate, where chitosan enhanced the anchoring of highly dispersed Co/Fe sites to suppress agglomeration and improved membrane mechanical flexibility. The equimolar Co₅Fe₅CM exhibited optimized porous structure (BET: 541.3 m 2 /g), excellent electrical conductivity (8542 S/m), and superior oxygen reduction reaction (ORR) activity. Under mild conditions (1.2 V, pH 3), the EMR achieved 99.4% removal of 100 mg/L SMX and 45.3% COD removal, with 12.4% TOC removal indicating effective transformation and partial mineralization. Mechanistic investigations confirmed that Fe Co sites formed a FeCoN 6 -like local structure with site-specific synergy. Fe sites thermodynamically favored 2e − ORR for efficient H 2 O 2 production, while Co sites kinetically promoted 1e − activation of H 2 O 2 to ·OH. ·OH and O 2 · − served as dominant active species, enabling multi-pathway SMX removal through sulfonamide bond cleavage and oxazole ring opening, with significantly reduced biotoxicity of intermediates. The EMR maintained stable removal efficiency (93.1% after 10-day continuous operation), and the concentrations of Co and Fe in the effluent were lower than the instrumental detection limit, and exhibited good universality for various refractory pollutants, providing a green, cost-effective, and scalable solution for antibiotic-contaminated wastewater treatment, and further demonstrates great potential for simultaneous organic pollutant elimination and salt rejection in high-salinity desalination wastewater systems, broadening the application boundary of electrocatalytic carbon membranes for seawater desalination and brine resource utilization. Download: Download high-res image (128KB) Download: Download full-size image
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高影响因子
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