ELECTROCHIMICA ACTA
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2024
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IF 5.5
Zhiwen Xu,Lanlu Lu,Weiwei Chen,Fei Yang,Guimei Liu,Yan Sun,Xiaoyi Qiu,M. Danny Gu,Ping Gao,Dong Su,Minhua Shao
Although zinc-air batteries (ZABs) have made great progress in recent years, there still a great challenge to develop low-cost bifunctional electrocatalysts with high catalytic activity and stability. Herein, we report a bifunctional oxygen electrocatalyst consisting of ZIF-derived carbon-anchored Fe/Fe 3 C nanoparticles and Fe single atoms, which are crosslinked by carbon nanotubes (denoted as CNT@Fe/Fe 3 C||FeNC). Benefiting from the synergetic effect of Fe/Fe 3 C nanoparticles, Fe-N 4 active sites, and the 3D interpenetrating network structure, CNT@Fe/Fe 3 C||FeNC shows excellent bifunctional catalytic activities with a low ΔE of 0.671 V. Furthermore, the assembled rechargeable ZAB demonstrates a high peak power density of 187 mW cm –2 and shows excellent cycling stability up to 600 h This work provides new ideas for constructing non-precious metal bifunctional catalysts for practical applications in ZABs.
研究领域:
材料科学
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电化学
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能源存储与转换
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Wei Zhang,Wei Wu,Fei Guo,Xinwei Dong
The control of morphology, structure and composition of metal–organic frameworks derived metal-nitrogen doped porous carbon (M–N–C) with high precision and accuracy is essential for the catalytic performance. While single-atom or small-sized nanometer catalysts show notable effects in catalysis, one catalyst combining the advantages of single-atom and nanometer catalysts may cultivate more benefits. Herein, we designed and successfully fabricated a series of Fe-doped ZIF–x with different morphologies (cube→truncated hexahedron→truncated octahedron) in one pot by simply adjusting the adding amount of vitamin C. After high-temperature calcination, Fe 3 C integrated with Fe single-atom planted in N -doped carbon (Fe SA /Fe NC –N–C–x) with various morphology, structure and composition could be acquired. Among them, Fe SA /Fe NC –N–C–0.75 exhibited the best catalytic performance for the transfer hydrogenation of halogenated nitrobenzenes with N 2 H 4 ·H 2 O under room temperature. Acid-leaching tests, poisoning experiments, and the density functional theory calculations showed that Fe 3 C integrated with Fe single-atom had a better catalytic effect than the separated Fe 3 C or Fe single-atom.
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
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Hanyu Tan,Chaoyang Shi,Mingli Xu,Zhiwei Meng,Baoyu Huang,Qingrong Long,Jie Yu
Constructing dual active sites, adjusting electronic structures at interfaces and optimizing the adsorption energy of intermediates can effectively enhance water electrolysis performance. A novel Fe 3 C-Ru/NFs bifunctional catalyst is successfully synthesized via an electrospinning-carbonization method, in which sub-nanometer Ru particles coupled with Fe 3 C. Experimental results indicate that Fe 3 C-Ru/NFs catalyst delivers exceptional HER (18 mV@10 mA cm −2 , 202 mV@500 mA cm −2 ) and OER (263 mV@10 mA cm −2 , 382 mV@500 mA cm −2 ) performance in 1 M KOH solution. Moreover, Fe 3 C-Ru/NFs catalyst was employed as a bifunctional electrode in an overall water electrolyzer, resulting in a lower cell voltage and excellent stability (1.87 V, 150 h @ 500 mA cm −2 ). Density Functional Theory (DFT) calculation shows that the synergy between Ru and Fe sites can enhance electron transfer, and initiate a hydrogen spillover mechanism, and optimize intermediate adsorption energies, finally accelerating both HER and OER processes. This work offers valuable insights into developing low-cost, high-efficiency water electrolysis catalysts, demonstrating the significant potential for practical applications.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-9
·
IF 5.479
Chen Yao,Zhang Xiao-Fang,Wang Ai-Jun,Zhang Qian-Li,Huang Hong,Feng Jiu-Ju
A pyrolytic method is described for preparation of ultrafine Fe 3 C nanoparticles incorporated into N-doped graphitic carbon nanosheets (Fe 3 C@NGCSs). Iron phthalocyanine and graphitic carbon nitride (g-C 3 N 4 ) are used as starting materials. The hybrid nanocomposite was placed on a glassy carbon electrode (GCE) and then applied to simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA) and xanthine (XA). Figures of merits are as follows: for AA, the linear response range covers the 54.0–5491.0 μM range, the lower detection limit is 16.7 μM, and the best working voltage (vs. the saturated calomel electrode (SCE)) is 0.05 V. The respective data for DA are 1.2–120.8 μM, 0.34 μM and 0.19 V (vs. SCE). For UA, the respective data are 4.8–263.0 μM, 1.4 μM and 0.32 V (vs. SCE), and for XA the data are 4.8–361.0 μM, 1.5 μM and 0.71 V (vs. SCE). The method was successfully applied to their simultaneous determination in spiked serum samples.
Ultrafine Fe 3 C nanoparticles embedded in N-doped graphitic carbon sheets for simultaneous determination of ascorbic acid, dopamine, uric acid and xanthine.
研究领域:
分析化学
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材料科学
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生物医学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
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2019
·Vol. 186
·期 4
·1-9
·
IF 5.479
Tong Yao,Liu Xueyan,Zhang Lei
Magnetic porous microspheres composed of Fe 3 C, MnO and graphitic carbon (Fe 3 C/MnO/GC) were prepared by a one-pot method. A polycondensate obtained from urea and formaldehyde served as the carbon source and was calcined in the presence of metallic iron and manganese to yield Fe 3 C/MnO/GC. The resultant hybrid has highly mesoporous architecture, large specific surface, graphitic structure and adequate saturation magnetism. It is shown to possess excellent pre-concentration ability for herbicides (monuron, chlortoluron, atrazine and terbutylhylazine). The sorbent can be easily separated and has a long service lifetime (>25 cycles). Under optimized conditions, the sorbent excels by good recoveries (78–120%), high enrichment factors (45–50) and good precision (RSDs ≤10.7%). The limits of detection are 0.01–0.10 μg L −1 for (spiked) water samples, 0.22–0.87 μg kg −1 for grape samples, and 0.18–0.74 μg kg −1 for potato samples. This work offers a new strategy for the construction of magnetic bimetallic heterostructured GC hybrids.
Schematic presentation of magnetic porous Fe 3 C/MnO/graphitic carbon microspheres and their application for the enrichment of trace level herbicides prior to HPLC analysis.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yuying Chen,Caiwen Wu,Haiyang Xie,Zhaoyan Deng,Yiming Liu,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Iron-based catalysts have garnered great attention as alternatives for Fenton-like catalysts in the degradation of organic compounds. However, there is a demand for the synthesis of highly efficient iron-based catalysts that can solve the problems of iron dissolution and poor stability. Herein, nitrogen-doped graphitic carbon-supported Fe-Co/Fe 3 C dual active sites catalyst (Fe-Co/Fe 3 C-NC) is successfully prepared by ball milling method combined with subsequent high-temperature self-reduction. 0.5 wt%-Fe-Co/Fe 3 C-NC shows high efficiency in the activation of peroxymonosulfate (PMS) for the ultrafast degradation of high concentration Rhodamine B (200 mg/L of RhB is completely degraded within 8 min and the degradation rate constant is as high as 0.5066 min −1 ), as well as high stability and good reproducibility, attributing to the synergistic mechanism between the dual active sites (Fe-Co and Fe 3 C) and the adsorption sites (Fe 3 C and pyrrolic-N). Chemical quenching experiments and electron paramagnetic resonance indicate that the prepared 0.5 wt%-Fe-Co/Fe 3 C-NC exhibits outstanding activation for PMS by generating reactive oxygen species (SO 4 •− , • OH, 1 O 2 ) and high-valent FeCo=O species. This work shows useful insights into the synthesis of iron-based dual active sites catalysts, providing exciting chances for the highly efficient degradation of high concentration organic wastewater.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Qian Peng,Yaobin Ding,Lihua Zhu,Guangli Zhang,Heqing Tang
A composite of Fe/Fe 3 C and N-doped graphitic carbon (Fe/Fe 3 [email protected] ) was prepared and used as a catalyst for the activation of peroxymonosulfate (PMS) toward the oxidative degradation of Norfloxacin (NOF). It was observed that Fe/Fe 3 [email protected] behaved as a bifunctional material, showing both good adsorption ability and catalytic activity. The maximum adsorption capacity of Fe/Fe 3 [email protected] for NOF was evaluated as 0.13 mmol g −1 . Under given conditions (NOF concentration 0.1 mmol L −1 , catalyst load 0.1 g L −1 and PMS addition 1 mmol L −1 ), the degradation of NOF was almost completely achieved in 20 min with a degradation rate constant of 0.22 min −1 . A non-radical mechanism was proposed for the activation of PMS by Fe/Fe 3 [email protected] by the scavenging test, EPR and chronoamperometry analysis. The fast and complete degradation of NOF was achieved via a rapid electron transform, in which both PMS and NOF molecular were adsorbed on the surface of Fe/Fe 3 [email protected] and PMS was activated by obtaining electrons from NOF to oxidize NOF. The present study provides a green bifunctional catalyst for the oxidative removal of organic pollutants in various environmental media.
研究领域:
环境科学
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化学工程
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催化
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水处理
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产品关联
DOI
高影响因子
NEW CARBON MATERIALS
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2025
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IF 6.8
Xiu-zhen LV,Xiang-xiang XU,Meng-meng YU,Yi-chen WEI,Jun-ying WANG,Jun-zhong WANG
The need for bi-functional catalysts that facilitate both the oxygen reduction (ORR) and carbon dioxide reduction (CO 2 RR) reactions arises from their potential to help solve the critical problems of carbon neutrality and renewable energy conversion. However, there are few reports on the development of bi-functional catalysts for zinc-air battery-driven CO 2 RR devices. We introduce a novel approach for synthesizing Fe 2 N/Fe 3 C species embedded in nitrogen-doped carbon nanofibers by electrospinning a solution of Hemin and polyacrylonitrile in N,N-dimethylformamide. The material has an exceptional catalytic performance, with a half-wave potential of 0.91 V versus RHE for the ORR and values of over 90% for both the selectivity and Faradaic efficiency for the CO 2 RR. The high catalytic performances are attributed to the strong coupling between the Fe 3 C/Fe 2 N heterostructure and the Fe-N-C sites in the nitrogen-doped carbon nanofibers. Notably, both Fe 3 C and Fe 2 N play distinct roles in both the ORR and CO 2 RR. This investigation indicates a way for designing advanced carbon-based bi-functional catalysts for use in this field.
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研究领域:
材料科学
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电化学
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可再生能源
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Tiantian Feng,Zhijie Cui,Pengfei Guo,Xuehong Wang,Juan Li,Xien Liu,Wenpin Wang,Zhongcheng Li
Tailoring surface composition and structures of catalysts affects their catalytic performance in hydrogen evolution reaction owing to the geometric and electronic effects. Herein, Ru nanoparticles embedded in 2D N-doped carbon nanosheets decorated with 2D Fe 3 O 4 –Fe 3 C heterostructures (Ru/Fe 3 O 4 –Fe 3 C/NC) are fabricated via pyrolysis of the mixture containing 2D-Fe 2 O 3 nanosheets, dopamine hydrochloride , RuCl 3 ·xH 2 O, and melamine . Interestingly, the good hydrogen evolution behavior is achieved on Ru/Fe 3 O 4 –Fe 3 C/NC with the high reactivity and stability. Ru/Fe 3 O 4 –Fe 3 C/NC offers an overpotential of 141 mV to realize the current density of 10 mA/cm 2 in 0.5 mol/L (M) H 2 SO 4 electrolyte. As for 1 M KOH, Ru/Fe 3 O 4 –Fe 3 C/NC promotes hydrogen evolution reactivity with 148 mV to achieve 10 mA/cm 2 . The current density slightly degrades after continuous I-t tests, verifying the good stability for Ru/Fe 3 O 4 –Fe 3 C/NC. The high reactivity might stem from high dispersion of Ru nanoparticles, enhanced conductivity due to doping N into carbon nanosheets, and heterointerfaces between Fe–O and Fe–C.
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 Materials Chemistry A
·
2017
·Vol. 6
·期 2
·516-526
·
IF 8.867
Qichen Wang,Yongpeng Lei,Zhiyan Chen,Nan Wu,Yaobing Wang,Bing Wang,Yingde Wang
3d transition metals or their derivatives encapsulated in nitrogen-doped nanocarbon show promising potential in non-precious metal oxygen electrocatalysts. Herein, we describe the simple construction of a bifunctional oxygen electrocatalyst with a “framework-active sites” structure, namely Fe/Fe3C@C (Fe@C) nanoparticles encapsulated in 3D N-doped graphene and bamboo-like CNTs (Fe@C–NG/NCNTs). The Fe@C structure provides additional electrons on the carbon surface, promoting the oxygen reduction reaction (ORR) on adjacent Fe–Nx active sites. The 3D NG hybrid with a bamboo-like CNTs framework facilitates fast reactant diffusion and rapid electron transfer. The optimized sample displays excellent ORR and oxygen evolution reaction (OER) activity, with a potential difference of only 0.84 V; this places it among the best bifunctional ORR/OER electrocatalysts. Most importantly, Zn–air batteries using Fe@C–NG/NCNTs as the cathode catalyst deliver a peak power density of 101.2 mW cm−2 and a specific capacity of 682.6 mA h g−1 (energy density of 764.5 W h kg−1). After 297 continuous cycle tests (99 h), the rechargeable batteries using Fe@C–NG/NCNTs show a voltage gap increase of only 0.13 V, almost half that of Pt/C + Ir/C (0.22 V) under the same conditions. This work provides new insight into advanced electrocatalysts utilizing the structural features of host nanocarbon materials and guest active species toward energy conversion.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Dazhi Gao,Lekai Zheng,Lina Hu,Ying Li,Hui Liu,Yanming Xue,Fang Liu,Jun Zhang,Chengchun Tang
It is of great significance to develop the highly active, durable and inexpensive oxygen reduction reaction (ORR) electrocatalysts for fuel cells and metal-air batteries . Nitrogen-doped carbon nanotube (NCNTs) was considered to be one of the most significant non-noble metal ORR electrocatalysts, but its catalytic activity has some shortcomings due to its unfavorable ORR intermediates adsorption characteristics. Herein, we report a new kind of nitrogen-doped carbon nanotubes, which have filled with Fe 3 C nanowires (NCNTs@Fe 3 C NWs), working as a stable and effective ORR catalyst. The half-wave potential of the obtained catalyst in a 0.1 M KOH solution is 0.88 V, which is significantly higher than the pristine NCNTs (0.79 V) and the commercial Pt/C (0.85 V). Compared with NCNTs, the improvement in ORR activity of NCNTs@Fe 3 C NWs can be attributed to the strain effect on the outermost carbon layer due to the high filling of Fe 3 C NWs. Most importantly, NCNTs@Fe 3 C NWs shows higher durability and better methanol tolerance than the commercial Pt/C catalyst. Density functional theory (DFT) calculation shows that the tensile strain can optimize the binding energy of ORR intermediates to a certain extent. This work provides new research ideas for the rational design of high-efficiency carbon-based ORR electrocatalysts through the direction of strain engineering.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Yidong Zhang,Rong Shao,Wei Xu,Jianfei Ding,Yuan Wang,Xiuhua Yan,Wenyan Shi,Min Wang
Hierarchical porous materials receive extensive attention due to their excellent electrode kinetic performance. Herein, a facile strategy is presented to fabricate hierarchical porous supercapacitor materials using NaCl-assisted MOFs gel as a structure-directing template. By controlling the additive amount of NaCl, hierarchical porous carbon-encapsulated Fe 3 C with tailored pore size distribution has been obtained with a high specific capacity of 184.1 mAh g −1 (602.3F g −1 ) at a current density of 1 A g −1 . The analysis of kinetics and impedance indicates that the tailored porosity can provide broad ion diffusion pathway and low charge-transfer resistance. Meanwhile, seawater was used instead of NaCl for preparing hierarchical porous carbon with good capacitive performance. When evaluated their practical applications, the assembled all-solid-state hybrid supercapacitor delivers a high energy density of 30.6 W h kg −1 at a power density of 600 W kg −1 , and even maintains an energy density of 15.5 W h kg −1 at a power density of 12000 W kg −1 with 86.5% capacity retention after 10,000 cycles. This work is anticipated to open up a new route of using MOFs gel and water-soluble salts for designing hierarchical porous electrode s materials, which pave the way for advanced utilization of MOFs gel and seawater.
研究领域:
材料科学
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电化学
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纳米能源
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功能材料
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储能技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）