ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Dong Zhang,Dafeng Zhang,Dong Fan,Junchang Liu,Hengshuai Li,Xipeng Pu,Haiquan Hu,Feng Guo,Peiqing Cai
Photocatalytic hydrogen production technology has emerged as one of the most promising technologies to address the future energy crisis. Cd0.9Zn0.1S (CZS) is a promising photocatalyst for visible light activation but is limited by the slow kinetics of photoexcited carrier separation. Density functional theory (DFT) calculations based on first-principles showed that the introduction of a cocatalyst, N-doped graphite carbon (FC@NC), could effectively reduce the adsorption free energy of hydrogen, thus accelerating the hydrogen reaction kinetics of CZS. Supported by theoretical predictions, magnetic FC@NC nanoparticles were successfully prepared by precipitation and calcination and then combined with tetrapod CZS by ultrasonic self-assembly and calcination to form the FC@NC/CZS composite photocatalyst with Schottky contact. The FC@NC/CZS composite photocatalyst with the best mass ratio of FC@NC proved a considerable photocatalytic hydrogen evolution rate up to 79.9 ± 0.1 mmol g–1 h–1 under visible light exposure, which was 4.4 ± 0.1 times that of pristine CZS, and the apparent quantum efficiency (AQE) at 450 nm was as high as 52%. Finally, based on the experimental results and DFT calculations, a possible mechanism for the enhanced photocatalytic activity of FC@NC/CZS composites with the Schottky heterojunction was first proposed. In general, we attribute the boosted and stable photocatalytic property of FC@NC/CZS photocatalytic performance to the following three aspects: (1) the bimetallic alloy cocatalyst easily acts as an electron collector, (2) the graphite carbon layer protects the alloy from oxidation, and (3) the nitrogen-doped carbon layer provides more active sites for the reaction. This work provided a green and economical technique for an efficient hydrogen evolution reaction using light energy in the environment.
研究领域:
材料科学
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能源科学
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理论计算
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Shuhan Jiang,Yujie Jia,Xiaoxia Yang,Qianchen Ou,Yanan Liu,Siqian Zhang,Dianwu Huang,Hongmei Wang
FeCo-LDH/g-C 3 N 4 S-type heterojunction photocatalysts were successfully prepared by thermal polymerization and electrostatic self-assembly methods. The structure, morphology, light absorption and photoelectrochemical properties of the prepared samples were characterized. The photocatalytic properties of the photocatalysts were evaluated by the degradation of tetracycline (TC) and photocatalytic hydrogen evolution from water splitting under visible light irradiation. The experimental results showed that the photocatalytic properties of FeCo-LDH/g-C 3 N 4 nanocomposites were superior to those of pristine g-C 3 N 4 . In addition, when the mass ratio of FeCo-LDH to g-C 3 N 4 was 7:100, the photocatalytic performance of the as-prepared FeCo-LDH(7 %)/g-C 3 N 4 is the optimal. The TC degradation rate of FeCo-LDH(7 %)/g-C 3 N 4 reached 78.0 % within 120 min, which was 2.63 times of that of pure g-C 3 N 4 . And the photocatalytic hydrogen evolution of FeCo-LDH(7 %)/g-C 3 N 4 was 107.28 μmol for 4 h, which was 12.68 times that of g-C 3 N 4 . The results showed that the as-prepared FeCo-LDH/g-C 3 N 4 nanocomposite photocatalysts have excellent performance in the degradation of TC and the photocatalytic H 2 evolution. Meanwhile, the EPR and trapping experiments revealed that OH and O 2 − played a main role in the photocatalytic TC degradation. The mechanism of photocatalytic TC degradation and hydrogen production of FeCo-LDH/g-C 3 N 4 nanocomposite photocatalysts was also discussed.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Yang Liu,Bowei Zhang,Ye Yuan,Weidong Liu,Hongya Wu,Shengjian Qin,Qingyuan Fang,Gang Yu,Biao Wang
Since biomass-derived carbon materials possess the advantages of peculiar morphology and low density. They have received significant attention on microwave absorption materials. We synthesize a one-dimensional hollow FeCo/carbon microtubule (FeCo/CMT) derived from homogeneous kapok fiber using a feasible solvothermal method and calcination process. The graphitization degree and magnetic properties of FeCo/CMT could be controlled by manipulating the calcination temperature. The FeCo/CMT composite with the calcination temperature of 600 °C demonstrated exceptional microwave absorption performance, characterized by strong absorption (−50.6 dB), broadband absorption (12.4–18.0 GHz), thin thickness (2.5 mm), and low loading (10 wt%). The hollow structure, interfacial polarization, and the synergistic effect between FeCo and CMT collectively account for the microwave absorption mechanisms. Considering its outstanding comprehensive characteristics and performance, the biomass-derived hollow FeCo/CMT shows great potential for widespread application as a high-performance microwave absorption material.
研究领域:
材料科学
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电磁学
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生物质工程
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Xintao Ma,Shuo Wang,Hui Wang,Junjie Ding,Sen Liu,Zixu Huang,Wenzhi Sun,Guijing Liu,Ling Wang,Wenlong Xu
The layered structure of layered double hydroxides (LDH) is the key to its use as an electrode material , however, the lack of efficient charge exchange between layered structures severely limits the application of LDH in supercapacitors . In this work, FeCo-LDH was composited with C 3 N 4 by hydrothermal method , and a penetrating structure was built using the layered structure of the two materials. The penetrating structure provides a channel for charge transfer between FeCo-LDH layers and also solves the self-stacking problem of C 3 N 4 . The structure of the composites was explored by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscope (TEM), and the results showed that FeCo-LDH composited with C 3 N 4 and formed a penetrating structure. In addition, the electrochemical behavior of the electrode material was evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). Electrochemical test results show that it has a high specific capacity (593 C g −1 ) at 1 A g −1 . Furthermore, in order to study the energy storage properties of the composites, the optimal composites were designed as positive electrode as asymmetric supercapacitors , and the designed asymmetric supercapacitor still has a retention rate of 83.72 % after 10,000 cycles. This attractive performance reveals that FeCo-LDH@C 3 N 4 could as an electrode material for high-performance supercapacitors .
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Shuyan Lin,Yongxiang Wang,Xinyu Jing,Haonan Shen,Yide Hao,Zongyu Zhang,Jiangshan Gao,Yan He
The agglomeration phenomenon of metals in transition metal-based carbon catalysts has been one of the major reasons hindering their replacement of commercial Pt/C. Its self-aggregation phenomenon greatly limits the number of active sites and reactivity, which affects the catalytic performance. To overcome this issue, this work prepared a high N-doped carbon structure catalyst coated with high-dispersion FeCo/Fe 3 C nanoparticles. This was achieved by utilizing the advantages of the Prussian blue analogs (PBA) metal framework structure to suppress the self-aggregation of metals, thereby achieving high dispersion. Additionally, the introduction of melamine compensated for the nitrogen loss caused by the carbonization of PBA, thus increasing the nitrogen doping content. The experimental results show that when the calcination temperature is 850 °C and the mass ratio of melamine to FeCo PBA is 5, the half-wave potential (E 1/2 ) of the FeCo@NC catalyst prepared can reach 0.857 V, and the current intensity of FeCo@NC catalyst can maintain 97.12 % during 40,000 s stability test, which is much higher than that of commercial Pt/C. Moreover, the prepared FeCoNC@-850-5 and commercial Pt/C catalysts were used as cathode catalysts for Zn-air batteries (ZAB), and FeCoNC@-850-5 had higher open-circuit voltage (OCV), power density, and specific capacity. These findings demonstrate that the catalyst possesses excellent catalytic activity and promising application prospects, providing a new perspective for the design of efficient oxygen reduction catalysts based on the coupling of bimetallic alloys and N-doped carbon materials.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Xiaoxue Pan,Qiyang Liu,Jingjing Jiang,Xingyue Fang,Yingying Liu,Jinli Qiu,Xuesheng Zhang
Burgeoning oxidation technology based on peracetic acid (PAA) has been widely used to treat organic pollutants, and the development of efficient catalytic materials is a vital theme. In this study, a novel catalyst FeCo@NC was designed to degrade sulfamethoxazole (SMX), a typical sulfonamide antibiotic, which not only owned excellent activation performance of PAA, but also presented superior recycling performance and stability. Ten μM of SMX were nearly completely removed within 90 min under the conditions of 25 °C, pH at 7.0, 0.5 g/L catalyst, and 100 μM of initial PAA. FeCo@NC/PAA technique possessed a satisfactory degradation performance on SMX in a wide pH range, and even in the presence of a variety of anions and humic acids. The 90-min degradation rate of SMX in FeCo@NC/PAA system remained above 70 % after 4 cycles. Metal ion leaching data together with the X-ray diffraction (XRD) results confirmed the reusability and stability of this material. Superoxide and organic radicals eliminated SMX via the bond cleavage of S–C or S–N, hydroxylation and coupling reaction to yield 11 intermediates. The S–N bond cleavage was an eco-friendly route. This study provides a reference for the design of effective catalysts and their application in the treatment of refractory organic pollutants.
研究领域:
环境科学
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催化材料
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水处理技术
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产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 22
·1831
·
IF 4.4
Dianfeng Cao,Yuwen Li,Chao Lv,Yongtao An,Jiangfeng Song,Mingcan Li,Xin Zhang
Catalytic methane decomposition (CMD) reaction is considered a promising process for converting greenhouse gas CH 4 into hydrogen and high-value-added carbon materials. In this work, a series of Al 2 O 3 -supported FeCo alloy catalysts were successfully prepared in the CMD process. Compared to the pre-reduced catalysts, the in situ reduced FeCo alloy catalysts showed higher methane conversion rates, with the highest reaching 83% at 700 °C, due to the finer active nanoparticle size and greater exposure of active site. Furthermore, the time-on-stream tests demonstrated that the catalytic activity of in situ reduced FeCo alloy catalysts could remain above 92.3% of the highest catalytic activity after 10 h. In addition, TEM analyses of the carbon products from the CMD in situ reduced catalysts revealed the production of carbon nanofibers and nanotubes several microns in length after the reaction. This indicates that the in situ reduced FeCo alloy catalysts more effectively promoted the growth of carbon nanofibers. These results could provide a viable strategy for future methane decomposition development aimed at producing hydrogen and high-value carbon.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2025
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IF 6.1
Mao Huang,Rui Wang,Fan Yu,Qi Ding,Yanyan Zhu
Tanshinol, an active ingredient extracted from the Salvia miltiorrhiza herb, is widely used in Chinese medicine or health supplements. Accurately and rapidly quantifying of tanshinol under near-neutral or neutral conditions is of great significance but still a significant challenge. Herein, a novel electrochemical sensor based on bimetallic FeCo phosphides (Fe x Co 1-x P) was developed for rapid and sensitive detection of tanshinol in near-neutral environments. Fe x Co 1-x P nanocrystals supported on porous graphene (Fe x Co 1-x P/GFs) were synthesized, with Fe 0.25 Co 0.75 P/GFs demonstrating an enhanced electrochemical response for tanshinol detection at pH 6.5. The Fe 0.25 Co 0.75 P/GFs-based tanshinol electrochemical sensor exhibited linear detection ranges of 0.20–11.65 μM and 11.65–39.98 μM, which could accurately quantify tanshinol in Salvia miltiorrhiza herb. This study highlights the potential of earth‐abundant FeCo phosphides for the electrochemical detection of tanshinol under benign conditions, offering a promising approach for the standardized analysis of Salvia miltiorrhiza herb.
研究领域:
中药学
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分析化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Xin Deng,Jinwei Chen,Qiuyan Chen,Yunzhe Zhou,Xinchi Liu,Jie Zhang,Gang Wang,Ruilin Wang
The modification of Ir or oxygen vacancies (V o ) is a strategy to enhance the oxygen evolution reaction (OER) performance of heterogeneous nanocatalysts. However, it is crucial to further clarify the synergistic effect of Ir and V o on the enhancement mechanism of OER performance after surface reconstruction. In this work, FeCo Layered double hydroxides (LDHs) co-modified by Ir and V o were successfully prepared by the thermodynamically favorable galvanic replacement reaction. Electrochemical impedance spectroscopy confirmed that the synergistic effect of Ir and V o enhanced the charge transfer of FeCo LDHs. XPS spectra reveal robust interactions between Ir and FeCo LDHs. Density-functional theory further reveals that the low-oxygen-coordinated Ir (III) acts as an active site to optimize the OER rate-determining step energy barrier. As a result, Ir and V o co-modified FeCo LDH requires only a 203 mV overpotential to achieve a current density of 10 mA cm −2 and, more importantly, operates stably at an industrial current density of 250 mA cm −2 for 312 h without degradation. This work provides new insights and avenues for understanding the enhanced performance mechanism of catalysts after surface reconstruction and for industrial scale-up production.
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 ELECTROANALYTICAL CHEMISTRY
·
2019
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IF 3.218
Shufang Cui,Yuanchun He,Xiangjie Bo
In this work, FeCo nanoparticles encapsulated in graphitic carbon layers are derived by direct pyrolysis of Prussian blue/ZIF-67. First, the Prussian blue nanocubes with size of 100–150 nm are selected as cores for growth of ZIF-67 metal organic frameworks . Subsequent direct pyrolysis of Prussian blue/ZIF-67 in nitrogen atmosphere enables the formation of carbon nanospheres with FeCo nanoparticles embedded into the nitrogen-doped graphitic carbon layers. The encapsulation of FeCo nanoparticles into the nitrogen-doped carbon layers favors the electron penetration from the underlying FeCo nanoparticles to the nitrogen-doped graphitic carbon layers, tuning the electron density and the electronic properties at the carbon overlayers and then promoting the both hydrogen and oxygen evolution reaction activity. By optimizing the ratio between the Prussian blue and ZIF-67, the active and inexpensive carbon layers-encapsulated FeCo nanoparticles achieve high activity towards the hydrogen evolution reaction, exhibiting a low overpotential of 106 mV at 10 mA cm −2 as well as a low Tafel slope of 90.0 mV dec −1 . As oxygen evolution reaction electrocatalysts , the carbon layers-encapsulated FeCo nanoparticles deliver an overpotential of 312 mV at 10 mA cm −2 and a low Tafel slope of 40.6 mV dec −1 . Severing as both anode and cathode, the carbon layers-encapsulated FeCo nanoparticles show a potential of 1.495 V at 10 mA cm −2 for water splitting, which is close to the noble metal benchmarks of Pt/C and RuO 2 counterparts. The carbon layers-encapsulated FeCo nanoparticles can be used as an attractive replacement for electrocatalytic 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 ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Hua Ma,Xiuwen Wu,Xiuli Fu,Zhijian Peng
The development of a facile strategy to fabricate inexpensive and efficient nonnoble metal-based alloys to replace their traditionally costly noble-metal counterparts for electrocatalytic water splitting holds great appeal. Here, we report novel FeNi-FeCo-C composite nanofibers (FeNi-FeCo-C CNFs), which was prepared simply by electrospinning a precursor solution containing Fe, Ni and Co nitrates together with polyacrylonitrile powders and subsequent thermal treatment. The optimal FeNi-FeCo-C CNFs prepared with 10 wt% polyacrylonitrile at a thermal treatment temperature of 800 °C show excellent electrocatalytic performance for oxygen evolution in a 1 mol·L −1 KOH aqueous solution with a relatively small overpotential of 262 mV at 10 mA cm −2 , a low Tafel slope of 47.2 mV dec −1 , and excellent cycling stability. The present strategy will provide new insight for the design and fabrication of electrocatalysts for water splitting.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Ziqi Zhu,Qian Zhang,Mingjun Xu,Yuwei Xue,Ting Zhang,Junming Hong
Oxygen vacancies (O v ) can improve the electronic structure of catalyst, thus enhancing catalyst activity and reducing metal leaching . In this work, an O v -enriched FeCo bimetallic catalyst (3DOM FeCo) was designed and prepared. The presence of abundant O v was observed by Raman measurements and electron paramagnetic resonance (EPR). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) indicated the improvement of electrochemical and photochemical properties of 3DOM FeCo by O v . The function of O v as the main active site for PMS adsorption and activation were proved by XPS analysis and density functional theory (DFT). With the superior properties modified by O v , 3DOM FeCo achieved 100% APAP degradation and 50% mineralization within 60 min. And 3DOM FeCo/PMS system was effective and adaptable in different pH values and real water samples. This work made great efforts in continuously improving catalytic efficiency and solving secondary pollution problems.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）