Electrocatalysis
·
2023
·Vol. 14
·期 5
·776-787
·
IF 3.1
Zheng Yingping,Yu Dehua,Zhang Ke,Xu Wei,Ma Kaili,Wang Yuhang,Lou Yongbing
As a representative anodic reaction, the oxygen evolution reaction (OER) is often combined with hydrogen evolution, carbon dioxide reduction, and other cathodic reactions. Bimetallic selenides can satisfy the requirement of efficiency and economy for OER. However, the OER performance of Fe-Co-Se is less than satisfactory, restricted by the limited inherent active sites. Therefore, by doping P into Fe-Co-Se, the electron density and mass transfer were successfully adjusted. The 3D dandelion-like flower Fe-Co-Se-P/CC showed η 10 of 210 mV and the 45.3 mV dec −1 Tafel slope better than Fe-Co-Se/CC and RuO 2 . Experimental investigations demonstrated that outstanding OER activity was ascribed to the double modulation influences of P dopant both in electron environment and morphology which could not only improve conductivity but also enrich catalytic reactive sites. This work presents another choice for the design of a transition metal OER catalyzer and propels the development of electrocatalytic oxygen production to higher efficiency and lower cost. Graphical Abstract 3D dandelion-like flowers Fe - Co-Se-P structure anchored on carbon cloth has been firstly synthesized as economy and efficient OER electrocatalyst, which displays outstanding catalytic perform ance (equipped with 210 mV low overpotential at η 10 ) and stability benefited from the double modulation effect of P doping on the electronic environment and morphology.
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Energies
·
2023
·Vol. 16
·期 9
·3684
·
IF 3.2
Ruimin Zhang,Ke Wang,Peng Wang,Yan He,Zhiming Liu
Single-atom catalysts (SACs) within carbon matrix became one of the most promising alternatives to noble metal-based catalysts for oxygen reduction reaction (ORR). Although SACs have significant benefits in reducing the total catalyst cost, it also has the disadvantages of weak interaction between atoms and poor stability. Hence, there is still much room for improvement for the catalyst activity. In response, we designed a Fe-Co-Pt ternary metal single atom catalyst anchored on covalent organic framework (COF)-derived N-doped carbon nanospheres (Pt, Fe, Co/N-C). Due to effective charge transfer between Pt single atom and neighboring Fe-Co components, an intense electron interaction can be established within the Pt, Fe, Co/N-C catalyst. This is beneficial for enhancing charge transfer efficiency, modulating d electronic structure of Pt center and weakening oxygen intermediate adsorption, thus distinctly accelerating ORR catalytic kinetics. As expected, the half-wave potential of Pt, Fe, Co/N-C was 0.845 V, much higher than those of commercial 20 wt% Pt/C (0.835 V), Pt/N-C (0.79 V) and Fe, Co/N-C (0.81 V) counterparts. Moreover, the Pt, Fe, Co/N-C catalyst demonstrated much-improved cycling stability and methanol tolerance.Keywords:oxygen reduction reaction;electrocatalysts;single atom;ternary metal;kinetics
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Journal of Environmental Sciences
·
2018
·
IF 3.12
Jianqiang Sun,Xiaobing Zhang,Anping Zhang,Chunyang Liao
To obtain a cost-effective adsorbent for the removal of arsenic in water, a novel nanostructured Fe–Co based metal organic framework (MOF-74) adsorbent was successfully prepared via a simple solvothermal method. The adsorption experiments showed that the optimal molar ratio of Fe/Co in the adsorbent was 2:1. The Fe 2 Co 1 MOF-74 was characterized by various techniques and the results showed that the nanoparticle diameter ranged from 60 to 80 nm and the specific surface area was 147.82 m 2 /g. The isotherm and kinetic parameters of arsenic removal on Fe 2 Co 1 MOF-74 were well-fitted by the Langmuir and pseudo-second-order models. The maximum adsorption capacities toward As(III) and As(V) were 266.52 and 292.29 mg/g, respectively. The presence of sulfate, carbonate and humic acid had no obvious effect on arsenic adsorption. However, coexisting phosphate significantly hindered the removal of arsenic, especially at high concentrations (10 mmol/L). Electrostatic interaction and hydroxyl and metal–oxygen groups played important roles in the adsorption of arsenic. Furthermore, the prepared adsorbent had stable adsorption ability after regeneration and when used in a real-water matrix. The excellent adsorption performance of Fe 2 Co 1 MOF-74 material makes it a potentially promising adsorbent for the removal of arsenic.
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Materials Today Chemistry
·
2025
·
IF 6.7
Junyuan Zhang,Jingjing Chen,Yulu Jing,Xiaolong Xu,Changyu Liu,Jianbo Jia
A Fe, Co, N doping hierarchical carbon composite was prepared using stepwise pyrolysis. The prepared composite exhibited excellent oxygen reduction reaction (ORR) activity with a half-wave potential (E 1/2 ) of 0.88 V (vs. reversible hydrogen electrode, RHE), which was higher than the commercial 20 wt% Pt/C (E 1/2 = 0.83 V). The oxygen evolution reaction (OER) activity of the prepared catalysts with the potential at 10 mA cm −2 (E j10 ) of 1.543 V was lower than that of the commercial RuO 2 (E j10 = 1.586 V). The corresponding turnover frequency (TOF) of FeCo@NC-3N-900 was 0.076 O 2 s −1 at E 1/2 (TOF of Pt/C was 0.057 O 2 s −1 at E 1/2 ) in ORR and 0.056 O 2 s −1 at E j10 (TOF of RuO 2 was 0.001 O 2 s −1 at E j10 ) in OER. As a result, the performance of the Zn-air battery assembled with FeCo@NC-3N-900 was better than that of the commercial Pt/C + RuO 2 . At the same time, Co was found that can elevate the ORR activity of the prepared composites by improving the mass diffusion, and FeCo alloy elevate the OER activity by improving the electron transfer. This work provided an efficient method for the preparation of ORR/OER bifunctional catalyst.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Jingchuan Guo,Yan Gao,Xuankai Cao,Xing Rong,Shidan Chi,Guolan Fan,Lei Zhang,Guohong Tian,Xudong Zhao
Hydrogen energy has attracted widespread attention as a high-energy–density, sustainable and clean energy source. Hydrogen production by electrolysis of water is a simple and efficient method of hydrogen production. However, most of the currently widely used commercial catalysts are expensive precious metals and their oxides. Therefore, it is necessary to develop low-cost, efficient and stable catalysts to promote the development of the hydrogen energy industry. Metal organic framework (MOF), as a new type of porous, high surface area material, has great potential in catalysis. Bimetallic MOF materials can further improve the catalytic activity of MOF materials as electrocatalysts by adjusting metal sites. In this paper, different proportions of Fe-Co bimetallic MOF materials were synthesized by hydrothermal method, and the Fe-Co bimetallic carbon materials prepared by carbonization at high temperature were used as OER electrocatalyst, and the microstructure and electrochemical performance of the materials were analyzed and evaluated through microscopic mechanism characterization and electrochemical characterization. The test results show that Fe-Co bimetallic carbon materials have excellent electrocatalytic performance, Fe 2 Co/C and RuO 2 have the smallest high-frequency semicircles, and have the smallest internal charge transfer resistance. This indicates that Fe 2 Co/C has similar conductivity to RuO 2 . When the current density is 10 mA·cm −2 , Fe 2 Co/C has an overpotential of 335 mV, and when the current density is 50 mA·cm −2 , Fe 2 Co/C has an overpotential of 382 mV, and the oxygen evolution performance of Fe 2 Co/C is better than that of commercial precious metal catalyst RuO 2 at high current density. At the same time, its Tafel slope is only 58.8 mV·dec −1 , which is lower than that of RuO 2 catalyst, and it has a faster charge transfer rate. After CV cycles and 12 h of electrolysis by continuous chronoamperometry electrolysis, it exhibited excellent electrocatalytic stability.
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Journal of Energy Storage
·
2025
·
IF 9.8
Wei Yin,Jie Ouyang,Mengyao Li,Yuzhu Wang,Mengting Cheng,Yijiao Geng,Zhexuan Liu,Jianhua Luo,Jinfeng Cai,Yongfeng Luo
A Fe/Co-doped zeolitic imidazolate framework-8 (ZIF-8) is synthesized in situ on porous carbonized wood, and high-performance composite electrodes are subsequently prepared through heat treatment. The simultaneous doping of Fe and Co can synergistically modulate the microstructures, nanoporous architectures, and hydrophilic properties of the carbon materials derived from metal-organic frameworks (MOFs), thereby enhancing their specific capacitance and energy density. Furthermore, the superior capacitive performance of Fe/Co-doped MOF-derived carbon on porous carbonized wood (Fe-Co/MC@PCW) is predicted through first-principles density functional theory calculations, which are based on the detailed analysis of band structure and surface adsorption characteristics. The composite electrode demonstrated a specific capacitance of 342 F g −1 (6.84 F cm −2 ) at 5 mA cm −2 . Correspondingly, a symmetric supercapacitor fabricated with this electrode achieved a specific capacitance of 141 F g −1 (2.82 F cm −2 ) under identical conditions, yielding an energy density of 19.58 Wh kg −1 and a power density of 125 W kg −1 . Notably, the electrode maintains exceptional capacitance retention, demonstrating only a minor reduction to 96 % after 15,000 cycles, even at 30 mA cm −2 . These results underscore the potential of integrating MOFs with wood-based carbon electrodes for the development of advanced energy storage systems.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiu Li,Zhanheng Yan,Yanglin Shen,Wanjin Liu,Jun Ding
Oxides with the ABO 3 chemical formula play a crucial role in studying photostriction in inorganic materials. In this study, the photostrictive behavior of ilmenite-type ceramics ATiO 3 (where A = Mg, Fe, Co, Ni, and Mn) was investigated under visible light irradiation. Among the ceramics investigated, CoTiO 3 showed the highest photostriction of approximately 0.1 % under 405, 520, and 650 nm light irradiation. The photostrictive response decreased successively in FeTiO 3 , MnTiO 3 , NiTiO 3 , and MgTiO 3 . Temperature and thermal expansion tests revealed that the deformation of the ceramics caused by the photothermal effect accounted for approximately half of their photostriction. Raman and charge transfer analyses indicated that the photostriction of the ceramics depended significantly on their crystal structure. Thus, the ceramics exhibited distinct photostrictive performances. This study highlights the connection between the crystal structure and photostrictive performance of ilmenite-type ceramics, providing valuable insights into the underlying mechanism of photostriction in inorganic materials.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Tongxin Xiao,Kangyue Qiao,Guodong Hao,Songyao Du,Yue Wang,Chao Sui
This study employed a solvothermal method to prepare an NH 2 -MIL-101(Fe, Co) bimetallic organic framework composite catalyst aimed at enhancing the photocatalytic reduction performance of Cr(VI). The experimental results show that introducing Co into the single-metal NH 2 -MIL-101(Fe) does not alter the material's octahedral structure. However, the bimetallic synergistic effect shifts the light absorption range to the red end of the spectrum, reduces the bandgap, and significantly improves carrier separation efficiency. Under visible light irradiation, the NH 2 -MIL-101(Fe, 0.15Co) catalyst exhibited outstanding photocatalytic performance, achieving a reduction efficiency of 94.7% for Cr(VI) within 40 minutes and 100% within 50 minutes, with a reaction rate constant 4.7 times that of the single-metal NH 2 -MIL-101(Fe). Free radical capture experiments further revealed that ·O 2 - is the key active species in the Cr(VI) reduction process, while photo-generated holes in the valence band can oxidise OH - to ·OH, synergistically participating in the reaction. Additionally, cyclic stability experiments showed that the catalyst maintained 85.8% reduction efficiency after five cycles, demonstrating excellent stability and practical application potential.
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Li Junchao,Li Xuhua,Han Jindong,Meng Fansheng,Jiang Jinyuan,Li Jiao,Xu Chunlian,Li Yun
Mesoporous bimetallic Fe/Co was prepared as a Fenton-like catalyst to degrade the tetracycline hydrochlorides (TC). The nanocasting strategy with KIT-6 as a hard template was carried out to synthesize the mesoporous bimetallic catalyst. The mesoporous bimetallic Fe/Co catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms, and Brunauer-Emmett-Teller (BET) method. The results showed that the catalyst has significant nanofeatures; the surface area, pore size, and particle size were 113.8 m 2 g −1 , 4 nm, and 10 nm, respectively. In addition, the effects of the operating parameters, such as the iron-to-cobalt ratio, pH, H 2 O 2 , and initial TC concentrations on its catalytic performance were investigated. The best operating parameters were as follows: iron-to-cobalt ratio = 2:1 to 1:1, pH = 5–9, H 2 O 2 : 30 mmol, initial TC less than 30 mg/L. Furthermore, the mesoporous bimetallic Fe/Co showed a good performance for degrading TC, achieving a removal rate of 86% of TC after 3 h under the reaction conditions of H 2 O 2 = 30 mmol, mesoporous bimetallic Fe/Co = 0.6 g/L, TC = 30 mg/L, pH = 7.0, and temperature = 25.5 °C. The mesoporous bimetallic Fe/Co catalyst shows good stability and reusability. This work demonstrated that mesoporous bimetallic Fe/Co has excellent catalytic efficiency, smaller amounts of leached ions, and wider pH range, which enhance its potential applications.
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RSC Advances
·
2020
·Vol. 10
·期 14
·8055-8065
·
IF 3.119
Wenpeng Han,Shanmin Wang,Xuekuan Li,Ben Ma,Mingxian Du,Ligong Zhou,Ying Yang,Ye Zhang,Hui Ge
The effect of Fe, Co and Ni promoters on supported MoS2 catalysts for hydrogenation of nitroarenes were systematically investigated via experiment, characterization and DFT calculation. It was found that the addition of promoters remarkably improved the reaction activity in a sequence of Ni > Co > Fe > Mo. Meanwhile Ni promoted catalyst with the best performance showed good recyclability and chemoselectivity for a wide substrate scope. The characterization results revealed that the addition of promoters decreased the interaction between Mo and support and facilitated the reductive sulfidation of Mo species to produce more coordinated unsaturated sites (CUS). DFT calculations showed that the addition of promoters increased the formation of CUS, and enhanced the adsorption of hydrogen. The influence degree of promoters followed the sequence Ni > Co > Fe > Mo, which was consistent with those of the activities. Nitrobenzene hydrogenation and hydrogen activation occurred at the S and Mo edge, respectively. The adsorbed hydrogen diffused from the Mo edge to the S edge to participate in the hydrogenation reaction. Mechanism investigation showed that the main reason for increased activity by the addition of promoters was the increase of amounts of CUS and the secondary reason was the augmentation of intrinsic activity of CUS. The present studies give a new understanding for promoter modified MoS2 catalysts applied for hydrogenation of nitroarenes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Dan Wang,Hanzhu Shi,Liangjun Ma,Xue Zhou,Rongrong Zhang,Yanhong Xu,Lu Li,Lingyu Zhang,Chungang Wang
The development of novel nanozymes with excellent enzyme simulation ability provides a new perspective for antibacterial and wound healing. However, the enzyme activity of traditional simplex nanozyme is not sufficient, meanwhile the nanozymic catalytic therapy alone cannot fulfill the purpose of effective antibacterial and wound healing. Hence, we develop novel multifunctional nanocomposites composed of FeCo alloys integrate with carbon spheres and carbon nanotubes (FeCo-C/CNT NCs) with hydrophobic property, enhanced oxidase-like (OXD-like) activity and photothermal property. Remarkably, i n vitro experiment shows the the antibacterial rates of 200 μg/mL FeCo-C/CNT NCs against Staphylococcus aureus (S. aureus) and Escherichia coli ( E. coli) are as high as 83.46 % and 90.98 %, respectively. The mechanism of synergistic antibacterial effect is not only due to the reactive oxygen species (ROS) generation from FeCo alloy part of FeCo-C/CNT NCs, but also because the local high temperature generated by the photothermal effects of FeCo-C/CNT NCs under near infrared (NIR) laser irradiation, as well as heat promoted ROS production. The FeCo-C/CNT NCs under NIR laser irradiation present best wound healing via hydrophobic protection, synergistic catalytic and photothermal therapy on S. aureus -infected mice. This work introduces a novel alloy nanozyme with excellent antibacterial property, providing new idea in the field of wound healing.
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Catalysts
·
2025
·Vol. 15
·期 12
·1108
·
IF 4
Heng Yang,Chuang Zhu,Yongwei Zhang,Manting Gu
Single-atom catalysts are highly efficient electrocatalysts for water splitting with exceptional atomic utilization, but atomic aggregation can impair their catalytic performance. To address this challenge, a Fe-Co-Ni single-atom bifunctional catalyst supported on nitrogen-doped graphene oxide was designed and employed for overall water splitting in alkaline electrolyte. The catalyst’s composition, structure, and morphology were systematically characterized using XRD, XPS, SEM, and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Electrochemical evaluations were performed to assess its activity and stability toward both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The results demonstrate that strong metal-nonmetal interactions between the Fe, Co and Ni single atoms and the nitrogen-doped graphene oxide support facilitate stable and uniform anchoring of the metal centers on the wrinkled carbon framework. The total metal loading reaches approximately 6.78 wt%, ensuring a high density of accessible active sites. Furthermore, synergistic electronic coupling among the Fe, Co, and Ni centers enhances charge transfer kinetics and modulates the D-band electronic states of the metal atoms. This effect weakens the adsorption strength of hydrogen and oxygen-containing intermediates, thus promoting faster reaction kinetics for both HER and OER. Consequently, the FeCoNi/CNG catalyst delivers low overpotentials of 77 mV for HER and 355 mV for OER at a current density of 10 mA cm−2in alkaline conditions. When integrated into an alkaline water electrolyzer, the system achieves a cell voltage of only 1.68 V to attain a current density of 10 mA cm−2, underscoring its outstanding bifunctional catalytic performance.
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