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
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Nano Energy
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2018
·
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.
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APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Yunxia Zhu,Yuming Zhou,Tao Zhang,Man He,Yongjuan Wang,Xiaoming Yang,Yong Yang
Lactate-intercalated Co–Fe layered double hydroxides (LDHs) were successfully prepared by coprecipitation and hydrothermal method. In this process, divalent metal ions as precursors can be obtained from the reduction reaction of lactic acid and metal powder (cobalt and ferrous). In order to obtain Fe 3+ , H 2 O 2 (30%) was used to oxidize Fe 2+ . Meanwhile, the produced lactate was intercalated into the LDHs interlayers to compensate the positively charged layers. The as-synthesized LDHs were studied by element chemical analysis, powder X-ray diffraction (XRD), FT-IR spectroscopy, thermogravitry (TG) and differential scanning calorimetry (DSC), TEM. The results indicated that the basal spacing value of the LDHs was larger than that of lactate-intercalated Mg–Al or Zn–Al LDHs. It proved that the lactate anions were inserted into the gallery in the form of dimers which made it easy to be delaminated in water. The obtained nanosheets were deposited on the substrates to form the film which was characterized by TEM and AFM, and infrared emissivity value (8–14 μm) was also investigated. The infrared emissivity values of Co–Fe LDHs were lower than that of Zn–Al which took advantage of the special electronic structure in Co and Fe. Besides, the orderly structure and the reduction of the interfacial deficiency of the film made the values further reduced.
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ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 27
·期 27
·1700886
·
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.
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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.
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Results in Chemistry
·
2025
·
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.
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Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Ming-feng Sun,Ting Wang,Li-guang Wu,Yu-xing Wang
This study attempted to enhance the permeation and antifouling performance of polyvinylidene fluoride (PVDF) ultrafiltration membranes. Reverse microemulsion containing cobalt and iron (Co–Fe) bimetallic hydroxide nanoparticles was blended with the PVDF membranes to construct a novel PVDF hybrid membrane. The permeation performance, antifouling property, and long-term operational stability of the hybrid membranes were evaluated via ultrafiltration process of water flux and bovine serum albumin (BSA) rejection. Structural characterization showed that the protection endowed by reverse microemulsion made the hydroxide nanoparticles to distribute uniformly in the PVDF polymeric matrix. The introduction of well-distributed bimetallic hydroxide nanoparticles substantially improved the pore structures and hydrophilicity of the PVDF hybrid membranes, thereby enhancing their permeation performance and antifouling property. The optimal water flux of the PVDF hybrid membranes (MD-10) reached 328 L·m −2 ·h −1 and was 5.4-fold higher than that of neat PVDF. Moreover, the MD-10 membrane had a high a high BSA rejection rate (91.04%). After four cycles of successive fouling-cleaning processes, the water flux of the MD-10 membrane still exceeded 160 L·m −2 ·h −1 and was fourfold higher than that of neat PVDF. However, excessive amounts of the microemulsion could not be uniformly mixed with the PVDF membranes, thereby decreasing the permeation and antifouling performance of the PVDF hybrid membranes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
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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DESALINATION
·
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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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Lixin Wang,Renjie Ji,Chunge Wang,Fanbo Meng,Zhongwu Luo,Mengran Wang,Hui Jin,Shijie Yang,Shi’an Zhao,Dahao Han,Yongjie Cheng,Tianyu Liu,Jianmin Ma,Yonghong Liu
To address the limited activity and durability of oxygen evolution reaction (OER) electrocatalysts, we present an integrated in situ strategy for constructing a three-dimensional Ni-Co dendritic electrode matrix coupled with a surface amorphous Ni-Co-Fe layered double hydroxide (LDH) catalytic layer. A Ni-Co dendritic matrix (NCDEM) with enhanced electrolyte accessibility and mass transport properties is first fabricated via jet electrodeposition, followed by the in situ hydrothermal growth of Ni-Co-Fe LDH nanosheets to construct a Ni-Co-Fe dendritic electrode (NCFDE). The introduction of NaBO₂ during the hydrothermal process regulates surface etching kinetics and the Fe³ ⁺ coordination environment, promoting uniform nanosheet growth and triggering the crystalline-to-amorphous transition of the LDH structure. The amorphous LDH layer increases the accessible active surface area, facilitates the formation of reconstructed NiOOH active species during OER, and enhances structural stability during prolonged electrochemical operation. The optimized B2-NCFDE exhibits outstanding OER performance in 1 M KOH, requiring an overpotential of only 215.34 mV to achieve 100 mA cm⁻², with a Tafel slope of 38.29 mV dec⁻¹ and stable operation at 500 mA cm⁻² for 2000 h. Furthermore, the B2-NCFDE||B2-NCFDE electrolyzer achieves 100 mA cm⁻² at a cell voltage of 1.822 V and demonstrates excellent durability for overall water splitting. This work provides a scalable strategy that integrates electrode architecture engineering with amorphous LDH regulation for efficient and durable hydrogen production.
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DESALINATION
·
2025
·
IF 9.8
Shuyu Liu,Liang Tian,Lihua Han,Qing Li,Liangliang Zhu,Su Chen
The conversion of waste plastics into metal-organic framework (MOF) photothermal materials presents promising opportunities for solar energy conversion, facilitating freshwater production and water purification through interfacial solar evaporation, and simultaneously heralding advancements in plastic waste recycling. Herein, we present a bimetallic Co/Fe-MOF photothermal converting material derived from PBAT-based plastic wastes, tailored for efficient solar water evaporation. The nanosheet-structured bimetallic Co/Fe-MOF featuring high light absorption, water wettability and photothermal conversion efficiency delivers an optimal evaporation rate of 1.81 kg m −2 h −1 under one sun irradiation, surpassing that of monometallic MOFs. Moreover, we employed three substrates—nanofiber film, aerogel, and hydrogel—to immobilize the Co/Fe-MOF solar absorbers, thereby constructing monolithic hybrid solar evaporators. These substrates not only confer the flexibility to Co/Fe-MOF solar absorbers for practicability but also serve as mediates to regulate thermal management and water states. Consequently, the hybrid evaporators exhibited significantly enhanced evaporation rates, with the hydrogel evaporator achieving to ~3.53 kg m −2 h −1 , coupled with remarkable salt resistance and durability. This bimetallic Co/Fe-MOF-based solar evaporator efficiently serves a dual purpose, enhancing clean water production through solar desalination and purification while also presenting a viable alternative to the issue of plastic waste, potentially harmonizing energy, environment and clean water nexus.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Di Chen,Guofu Li,Xing Chen,Qian Zhang,Jing Sui,Chengjie Li,Yingchao Zhang,Jing Hu,Jianhua Yu,Liyan Yu,Lifeng Dong
Rational construction of advanced bifunctional catalysts with dual-active-sites is still challenging for both oxygen reduction (ORR) and oxygen evolution reactions (OER). Herein, metal-doped dicyandiamide formaldehyde resin is innovatively exploited to synthesize N/Co/Fe/Ni multi-doped carbon nanotubes (denoted as CoFeNi@CNT) with metal-nitrogen-carbon (M N C) and CoFeNi nanoparticles as the ORR and OER active sites, respectively. Abundant active sites and high degree of graphitization enable CoFeNi@CNT with a high ORR half-wave potential of 0.82 V and a low OER overpotential of 440 mV at 10 mA cm −2 , which are comparable or superior to noble-metal catalysts. Particularly, the CoFeNi@CNT air electrode of rechargeable Zn-air batteries shows remarkable open circuit potential (1.46 V), discharge power density (152.3 mW cm −2 ), specific capacity (814 mAh g −1 ), and cycling stability for more than 250 h. It is worth emphasizing that this synthesis strategy is rather simple, low-cost, high yield, and the proportion and amount of doped metal ions can be easily adjusted according to the needs for different applications.
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