JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Jiahao Wang,Simin Zhang,Zhaolin Liu,Tengge Ning,Junfeng Yan,Kun Dai,Chunxue Zhai,Jiangni Yun
Traditional carbon materials such as graphene are often applied in the field of electromagnetic wave (EMW) absorption but they have unbalanced impedance matching and high conductivity. Bio-carbon with graphene-like structure derived from apples has many advantages over graphene: it can be prepared in large quantities and the abundant heteroatoms present in the lattice can provide many polarization phenomena. Herein, Prussian blue analogue (PBA) as a source of magnetic component was combined with bio-carbon or reduced graphene oxide (rGO) to study the EMW absorption properties. The fabricated BC/CFC-12-7 displayed performance with a minimum reflection loss (RL min ) of −72.57 dB and a wide effective absorption bandwidth (EAB) of 5.25 GHz with an ultra-thin and nearly equal matching thickness at 1.61 mm. The results show that the good EMW absorption property of bio-carbon composites comes from good conduction loss, large relaxation polarization loss especially from pyridinic-N, and better impedance matching. The optimized radar cross section is found to be –33.55 dB m 2 in the far-field condition using CST. This work explored the advantages of bio-carbon as a novel EMW absorbing material compared with graphene and provided ideas for realizing high-performance EMW absorbing materials in the future.
研究领域:
材料科学
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电磁学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jianding Li,Junping Shi,Yanling Hu,Min Li,Yao Kang
CoFe layered double hydroxide (CoFe LDH) can serve as a cost-effective and active electrocatalyst for oxygen evolution reaction (OER). Unfortunately, it still faces the challenges of low electrical conductivity , stability and limited active sites to achieve the threshold current density with low overpotential. In this study, the strategy of Ru doped together with air plasma treatment was proposed to improve the OER performances of CoFe LDH. The doping of Ru and air plasma process could induce electronic interaction and the oxygen defects to regulate the electronic structure. Significantly, the air plasma treated Ru doped CoFe LDH (P-Ru-CoFe LDH) catalyst achieved superior catalytic properties to the CoFe LDH and RuO 2 benchmarks, which was demonstrated by a relatively smaller overpotential of 275 mV at 10 mA cm −2 and a lower Tafel slope of 107 mV dec −1 for OER. In addition, it also maintained an excellent stability in long-term chronoamperometry test. In general, P-Ru-CoFe LDH catalyst could boost the OER performance through intrinsic electronic structure adjustment with Ru doped and air plasma process. These findings provide an effective pathway to design/develop OER electrocatalysts with high performances by internal electron coupling effects.
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
Catalysts
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2024
·Vol. 14
·期 12
·860
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IF 3.8
Tao Wu,Xin Ren,Xuesong Zhao
The utilization of the photo catalytic activation of permonosulfate (PMS) for the combined breakdown of pollutants has become a focal point in research. Layered double hydroxides (LDHs) have a unique layered structure which is conducive to the adsorption and diffusion of reactants, and can provide more active sites for photocatalytic reactions. The anions between the layers can be exchanged with a variety of substances so that specific catalytically active species can be introduced as needed. LDHs themselves have certain catalytic activity, which can produce synergistic catalysis between LDHs and the supported photocatalytic active substances, and further improve the degradation effect of antibiotics. In actual wastewater treatment, LDHs as a catalyst carrier have a good application prospect. However, the poor activation effect is attributed to the low separation efficiency of catalyst carriers and insufficient active sites. In this study, a dual active site system consisting of Co and Fe, known as CoFe-LDHs@MoS2, was developed as a catalyst to facilitate the synergistic degradation of norfloxacin (NOF) by PMS under visible light. The findings demonstrate that the material possesses an effective capacity for the synergistic degradation of NOF. A comprehensive investigation was conducted to assess the impact of different catalysts, PMS dosage, degradation systems (Vis, PMS, or Vis PMS), catalyst dosage, NOF concentration, pH, and cycle times on the degradation performance. The active free radicals, degradation pathways, and intermediate toxicity were elucidated through capture experiments, Electron Paramagnetic Resonance Spectrometer (ESR) analysis, a liquid mass spectrometry (LC-MS) toxicity assessment, and theoretical calculations. This research offers a novel approach for designing catalysts with exposed high activity sites for the effective removal of NOF from environmental water.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Min Wang,Baolin Liu,Hongyu Zhang,Zhenjiang Lu,Jing Xie,Yali Cao
Building efficient and stable bifunctional electrocatalysts toward oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is crucial for the advancement of rechargeable zinc-air batteries (ZABs). Here, a convenient in situ strategy is reported to controllably encapsulate CoFe alloy nanoparticles within N -doped carbon nanotubes (CoFe@NCNT). The abundant Co(Fe)-N x active sites and the synergistic interaction between CoFe alloys and carbon nanotubes facilitate mass transfer and interfacial charge transfer, resulting in excellent dual functional electrocatalytic activity of OER/ORR with minor potential difference (ΔE = 0.73 V). Thus, the corresponding rechargeable ZAB displays high power density (194 mW cm −2 ), excellent specific capacity (795 mAh g Zn -1 ), and favorable stability (900 cycles@5 mA cm −2 ). This work provides an approach for establishing low-cost bultifunctional electrocatalysts with excellent performance of non-noble metal nanoalloys.
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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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shuo Wang,Lu Wang,Yi Liu,Qingqing Li,Ying-Hua Zhou,Wei Chen
The electrocatalytic oxygen evolution reaction is a crucial means to support the conversion and storage of the sustainable renewable energy . Low-crystallinity can offer short-range structural ordering and high active site density. In this work, an efficient self-supported oxygen evolution reaction (OER) electrocatalyst , cobalt iron layered double hydroxide (LDH) grown on Ti 3 C 2 modified nickel foam (NF) heterostructure anode (CoFe-LDH/Ti 3 C 2 /NF) was prepared using electrodeposition . The exceptional electrocatalytic OER performance is ensured by in situ decorating monolayer Ti 3 C 2 /NF (s-Ti 3 C 2 /NF) with low-crystallinity CoFe nanospheres . By harnessing the low crystallinity , well-chosen composition and reasonable heterostructure , the overpotential of CoFe-LDH/Ti 3 C 2 /NF decreases to 246 mV at a current density of 10 mA·cm −2 in alkaline media. After 3000 cyclic voltammograms cycles, the ignorable increase in overpotential of 14 mV suggest the excellent long circular stability. Moreover, an accelerated reaction kinetics is implied by the smaller Tafel slope (28.76 mV·dec −1 ) and higher double-layer specific capacitance (2.33 mF·cm −2 ), which surpassed the counterparts CoFe-LDH grown on NF (CoFe-LDH/NF) and s-Ti 3 C 2 /NF. This work paves a new way to fabricate the low-crystallinity materials for electrocatalysis and energy storage.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
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IF 5.4
Yonglei Xing,Xiaohua Mai,Wenbo Lv,Fang Wan,Xiaoyong Jin,Gang Ni
Hollow carbon-coated CoSe 2 cubes (CCS2) were derived from a CoFe-PBA template. • Tuning Se-vacancy density reshapes Co electronic state for PMS activation. • CCS2 removed 95% SMX in 10 min with an apparent rate constant of 1.39 min −1 . • 1 O 2 and SO 4 •− dominate, while ·OH, O 2 •− and Co(IV)=O play auxiliary roles. • CCS2/PMS retained high activity over pH 3–11 and in real water matrices. The growing variety and chemical intricacy of refractory organic species in aqueous environments has elevated the design of robust, sustainable, and eco-compatible peroxymonosulfate (PMS) activation platforms into a key research thrust within advanced oxidation. Targeting the recurring drawbacks of common heterogeneous catalysts (insufficient active-site exploitation, considerable metal dissolution, and weak cyclic stability), we built a carbon-shelled cobalt selenide system (CCS) starting from CoFe-PBA, by sequentially performing hydrothermal selenization, polydopamine wrapping, and inert-atmosphere annealing. Modulating the selenium vacancy (V Se ) population proved to substantially reinforce PMS activation. Among the synthesized series, CCS2 emerged as the top performer, eliminating 95% of 20 mg L −1 sulfamethoxazole (SMX) over 10 min. Multi-technique characterization coupled with mechanistic probing revealed that incorporating V Se rearranged the electron distribution around Co atoms, raised the proportion of Co 2+ , and tightened the anchoring of oxygen-containing surface species. Concurrently, under-coordinated Se centers played a role in maintaining the Co 3+ /Co 2+ redox cycle, which together drove PMS through several parallel activation channels. Spin-trapping EPR measurements, quenching experiments, and selective probe assays jointly confirmed coexistence of SO 4 •− , •OH, 1 O 2 , and high-valent Co-O species in the CCS2/PMS system, with 1 O 2 and SO 4 •− as the principal contributors driving SMX abatement. These results elucidate the way anion vacancies tailor the electronic landscape and synergistic catalytic pathways of transition-metal selenides under PMS activation, providing a new conceptual route for designing durable sulfate-radical-based AOP catalysts via defect engineering. Download: Download high-res image (262KB) Download: Download full-size image
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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
Zhilin Yang,Kechang Li,Daguang Zhang,Hua Yang
In order to solve the problem of environmental pollution caused by fossil fuel emissions, electrocatalytic overall water splitting is a very promising energy conversion device. In the field of large-scale overall water splitting, it is particularly important to develop new non-precious metal electrocatalysts. In this paper, we successfully prepared CoFe@Co 2 C@Co/NF by hydrothermal synthesis of CoFe-LDH as the precursor and small molecule amine ethylenediamine as the C source. CoFe@Co 2 [email protected] /NF shows excellent electrocatalytic performance in alkaline environment. CoFe@Co 2 [email protected] /NF can provide low overpotential of 53 mV and 246 mV to reach 10 mA cm −2 current density in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. In addition, CoFe@Co 2 [email protected] /NF was used as the anode and cathode of the electrolytic cell system for overall water splitting, and the current density of 10 mA cm −2 can be reached with a voltage of only 1.57 V, which is superior to the commercial electrolytic cell system composed of Pt/C and RuO 2 . The material exhibits a good coupling effect of soft and hard magnetic exchange. This provides new insights into the development of transition metal carbides as high-performance electrocatalysts.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 24
·9455-9465
·
IF 8.262
Haiming Sun,Xijia Yang,Lijun Zhao,Tianhao Xu,Jianshe Lian
Here we report a flexible one-pot hydrothermal synthesis of an octahedral CoFe/CoFe2O4 submicron composite used as a superior Fenton-like catalyst for the decomposition of organic pollutants in water. As a peroxymonosulfate (PMS) catalyst, the non-toxic CoFe/CoFe2O4 submicron composite can highly efficiently decompose Orange II (30 mg L−1, 1.5 min and 60 mg L−1, 3 min). Especially, the CoFe/CoFe2O4 submicron composite exhibits better generalization for the degradation of different organic pollutants and excellent reusability due to its large size and structural stability. Furthermore, its high saturation magnetization (123.7 emu g−1) makes it convenient to magnetically separate from aqueous phase after catalysing the reaction, and its relatively large size is conducive to solving or minimizing secondary pollution. Meanwhile, the probable mechanism of PMS activation with CoFe/CoFe2O4 catalyst is proposed.
研究领域:
环境催化
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材料化学
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水处理技术
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纳米材料
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高级氧化工艺
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
·
IF 8.91
Jialing Sheng,Jiangyan Xu,Benyuan Qin,Hongmei Jiang
In this study, 3D flower-like magnetic CoFe-LDHs/CoFe 2 O 4 was prepared by a facile urea hydrothermal method and utilized to activate peroxymonosulfate (PMS) for degrading aniline (AN). CoFe-LDHs/CoFe 2 O 4 was systematically characterized to explore the relationship between its structure and catalytic performance. Compared with CoFe-LDHs synthesized by co-precipitation method, CoFe-LDHs/CoFe 2 O 4 exhibited three dimensional structure and larger specific surface, which could increase the degradation efficiency of AN markedly. 96% of 10 mg L −1 AN could be eliminated by 0.3 mM PMS and 50 mg L −1 CoFe-LDHs/CoFe 2 O 4 at initial pH 6 within 5 min and the total organic carbon (TOC) removal efficiency could be high to 52.8% in 30 min. CoFe-LDHs/CoFe 2 O 4 can be separated by a magnet easily due to its magnetism, which makes it avoid secondary pollution and provide convenience. After recycling six times, the degradation efficiency still maintained at 92.6%. Besides, CoFe-LDHs/CoFe 2 O 4 /PMS can degrade AN in practical water samples effectively. In addition, the possible mechanism of CoFe-LDHs/CoFe 2 O 4 /PMS system for the degradation of AN was proposed. The radical scavenging experiments confirmed that SO 4 · - , HO· and O 2 · - were involved and SO 4 · - played a dominant role in the degradation of AN, and it was further proved by electron Paramagnetic Resonance (EPR) as well. Our findings can provide some new insights into the efficient and skillful design and application of heterogeneous catalyst for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Lingling Qiao,Guoyi Duan,Sheng Zhang,Yuan Ren,Yanzhi Sun,Yang Tang,Pingyu Wan,Ran Pang,Yongmei Chen,Armistead G. Russell,Maohong Fan
Electrochemical ammonia synthesis is regarded as a green, clean, and sustainable technology alternative to the Haber-Bosch process to reduce fossil fuel consumption and greenhouse gas emission . In this research, an earth-abundant CoFe layered double hydroxide was prepared with a simple one-step hydrothermal method and was employed as a promising catalyst for electrochemical ammonia synthesis. The CoFe double hydroxide exhibited excellent catalytic activity with a high generation rate of 1.1 × 10 −9 mol s −1 cm −2 in a single-chamber cell, and a high Faradaic efficiency of 14.18% was obtained when the concentration of protons and electrons was limited in a double-chamber cell. The outstanding catalytic performance of CoFe layered double hydroxide was attributed to the abundant N 2 adsorption sites provided by the binder-free three-dimensional nano-structure and the synergy between the Co and Fe atoms in the layer. A microkinetic model of electrochemical ammonia synthesis catalyzed with CoFe layered double hydroxide was proposed, which was consistent with the experimental results. A possible ammonia synthesis mechanism was proposed based on the experiments and theoretical calculations.
研究领域:
材料科学
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环境科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 40
·19373-19380
·
IF 3.925
Chao Lei,Jingjuan Chen,Lin Lv,Houzhao Wan,Wenfeng Wang,Jun Zhang,Hanbin Wang,Chundong Wang,Hao Wang
Obtaining highly efficient and structurally stable electrocatalysts for electrocatalytic oxygen evolution reactions (OERs) at anodes by a simple and feasible strategy remains challenging for achieving hydrogen production with low-energy consumption. Herein, we successfully constructed a tri-phase interfacial structure of CoFe alloy/CoFe oxide/cobalt-doped iron oxide (denoted as CoFe/CoFeOx/Co–Fe3O4) as a highly efficient and low-cost OER electrocatalyst by a one-step chemical bath deposition approach. The tri-phase interfacial structure was achieved by controlling the dosage of reductants/oxidants and tuning the proportion of Co/Fe salts. The as-prepared CoFe/CoFeOx/Co–Fe3O4 not only delivered a remarkable OER activity, i.e., a low overpotential of 291 mV at 10 mA cm−2 and a small Tafel slope of 47.8 mV dec−1, but also exhibited a decent stability for a long-term electrolysis. To unveil the catalytic mechanism, two reasonable aspects of adsorption regulation of oxygenating intermediates and interfacial charge transfer at electrodes/electrolytes were predictively proposed.
研究领域:
材料科学
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电化学
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Shanshan Wang,Yi Liu,Xiaolong Deng,Jiafeng Cao,Yufeng Han,Jinzhao Huang,Yibing Li
In this study, unique Co 3 S 4 /Fe 3 S 4 heterostructures (denoted as CoFe-HM-T) were synthesized from CoFe layered double hydroxides (LDHs) by a two-step hydrothermal process (hydrazine monohydrate and thiourea treatment). The effect of Co 3 S 4 /Fe 3 S 4 heterostructures on the electrocatalytic water splitting was investigated in alkaline solution. The CoFe-HM-T electrode exhibited excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) catalytic activity with overpotentials of 320 mV and 200 mV at the current density of 100 mA cm −2 , respectively. CoFe-HM-T also possessed the smallest Tafel slope among the prepared samples, which was estimated to be 38.1 mV dec −1 and 144.9 mV dec −1 for OER and HER, respectively. Serving as bifunctional catalysts, the CoFe-HM-T electrode reached the state-of-art current density of 10 mA cm −2 at a cell voltage of 1.70 V with excellent stability. The enhanced electrocatalytic activity was ascribed to the interconnected structure facilitating the mass transport, the heterojunction accelerating the charge transfer, and the synergistic effect between them. This study offered a new strategy for in situ synthesizing the heterojunction electrocatalysts with unique interface by readily tuning the metal components in transition-metal LDHs.
研究领域:
材料科学
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电化学
✓ 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）