INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Wenyu He,Jinhui Wei,Ting Huang,Enren Zhang
For practical applications of microbial fuel cells (MFCs), 5H-dibenz [b,f] azepine-5-carboxamide (Carbamazepine, CBZ) was used as the organic precursor for the synthesis of catalysts composed of Fe–N–C complexes (named as Fe-CBZ-Cats) through a sacrificial support method. Characterizations by SEM, XPS and TEM-EDS elemental mapping show that the synthesized Fe-CBZ-Cats have porous structure and uniformly dispersed Fe/N/C complex centers which could play key roles in effective ORR . Linear scanning voltammetry (LSV) measurements show that the synthesized Fe-CBZ-Cats exhibits ORR activity comparable to commercial Pt/C catalysts under the same catalyst loading (2 mg cm −2 ). The maximum power density produced by cathode-limiting MFCs with Fe-CBZ-Cats air cathodes was 431 ± 23 μW cm −2 , higher than those in the control MFCs with Pt/C air cathodes (403 ± 13 μW cm −2 ) and activated carbon air cathodes (296 ± 24 μW cm −2 ). In addition, the toxicity tolerance of the synthesized Fe-CBZ-Cats is much higher than Pt/C.
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2023
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IF 6.6
Tianfang Yang,Ye Chen,Miao Tian,Xupo Liu,Fengxian Zhang,Jing Zhang,Kun Wang,Shuyan Gao
ABSTRACT Heteroatom doping is considered as an effective approach that manipulates the local bonding environment to improve the electroactivity of Fe-N/C catalysts. Herein, the oxidation polymerization-pyrolysis approach is applied to fabricate the uniformly F-doped porous Fe-N/C catalysts (F-FeNC) through utilizing 4-fluoroaniline as a “self-doping” precursor with N and F elements simultaneously. The synergistic effect between ligand trapping and long-range interaction of F atoms provides high density of Fe-N x active sites. The F-FeNC catalyst demonstrates superior ORR performance in alkaline media with a positive half-wave potential ( E 1/2 ) of 0.82 V, low H 2 O 2 yield of ∼3.4% and rapid 4e − transfer process. The liquid-state Zn-air battery (ZAB) assembled with F-FeNC catalyst as air cathode delivers excellent rate capability, power density (141 mW cm −2 ), specific capacity (760 mAh g − 1 ) and long-term cycle durability over 120 h. Moreover, the as-assembled all-solid-state ZAB shows excellent cycle stability at 0°∼180° bending conditions, revealing great prospects in flexible electronic device applications. Engineering the electronic structure of active sites via F self-doping provides an insightful route for designing multi-heteroatom doped Fe-N/C catalysts.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Yinling Wang,Juan Wang,Dandan Wei,Maoguo Li
M–N–C electrocatalysts for the oxygen reduction reaction (ORR) have been considered as the most promising alternatives to precious metal catalysts. However, the catalytic activity of M–N–C especially in an acidic medium is still unable to meet the practical requirement, and the corresponding ORR mechanism also remains unclear. Herein, an “MOF-protective-pyrolysis” strategy was adopted to synthesize an Fe–N–C catalyst (P-FeMOF@ZIF-8) with Fe–N4 as the predominant Fe species. The P-FeMOF@ZIF-8 displays high catalytic activity in both acidic and alkaline mediums. The experimental results further reveal the different importance of the Fe species in different mediums. Based on the results, a distinct mechanism of the ORR the in acidic medium was proposed, where the synergistic effect of the Fe–N4 site and carbon in improving the kinetics of the ORR were well explained. The findings and the corresponding perspective may provide a new guidance for the design of highly efficient ORR electrocatalysts.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Cheng Hou,Jiang Zhao,Libin Yang,Jiabin Chen,Xuefen Xia,Xuefei Zhou,Yalei Zhang
A single-atom Fe-N-C catalysts (Fe-N-C) was successfully prepared through a facile synthesis route using microalgae to drive hydrogen peroxide (H 2 O 2 )-based Fenton-like reactions. The detailed characterization analyses confirmed the simultaneous presence of Fe/Fe compounds and Fe-N x coordination sites in the optimal catalyst (Fe-N @ MBC) obtained through the pyrolysis of FeCl 3 ·6 H 2 O and Chlorella vulgaris . Surprisingly, when applied in H 2 O 2 -based advanced oxidation processes (AOPs), Fe-N @ MBC demonstrated excellent proficiency for both H 2 O 2 and O 2 activation, with the contribution of the original dissolved oxygen for sulfamethoxazole removal reaching up to 47.59%. The experiment and density functional theory (DFT) calculation results indicated that the Fe/Fe compounds significantly boosted the activity of Fe-N x by lowering the energy barrier of the reactive oxygen species formation and promoting the electron transfer between Fe-N x and the oxidants (H 2 O 2 and O 2 ). These findings provide new insights into the facile synthesis, rational design, and catalytic mechanisms of Fe-N-C used in H 2 O 2 -based AOPs.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jinyuan Zhu,Lu Wang,Waseem Hayat,Yongqing Zhang,Shaobin Huang,Xinfeng Zhang,Shaoqi Zhou
The abundant and environmentally friendly metal iron (Fe) is an excellent candidate to activate peroxymonosulfate (PMS) for the oxidative decomposition of organic pollutants . However, Fe-based activators have disadvantages of high efficiency only in a narrow pH range and easily generated Fe-sludge. Therefore, developing wide pH range efficient and stable Fe-based PS activators is needed. In this study, iron–nitrogen-carbon (Fe-N-C) activators were prepared using covalent organic frameworks containing homogeneous micropores and high porosity as a precursor. The Fe-N x -rich activator showed an outstanding activity and a high stability in the heterogeneously activated PMS system. It found that the 10 mg/L paracetamol (PCT) could be degraded completely within 5 min when adding 30 mg/L activator and 3 mM PMS. Furthermore, the system shows good performance in an extensive buffer pH range (2.6–10.67). The quenching experiments and intermediate product tests supported that the high-valent iron-oxo species is the major reactive oxygen species (ROS) in this system, and the designed experiments confirmed that Fe-N as the active site that in charge of activating PMS. This work provides insights for improving the activation efficiency and expanding the pH working range of iron-based catalysts in the field of advanced persulfate oxidation .
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高影响因子
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