JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shuang’an Liu,Wankun Qi,Ying Cao,Chengyang Liang,Shitong Geng,Haipeng Guo,Ying Liu,Yanhong Luo,Wenming Zhang,Ling Li
The electrical conductivity and catalytic activity of the electrode materials greatly affect the photoelectric conversion performance of DSSCs . However, the commonly used Pt electrodes no longer meet the needs of long-term development at present. Herein, based on the Kirkendall effect, CoFe 2 O 4 @C nanoparticles with core-shell structure are successfully prepared using the treatment of quasi-sol-gel method. The size of CoFe 2 O 4 @C nanoparticles is homogenized without agglomeration through adjusting the ratio of metal salt in the precursor. The composite exhibits excellent counter electrode properties in DSSCs, which attributes to the large specific surface area and superior electro-catalytic activity. With the optimized film thickness (12 µm) of CoFe 2 O 4 @C, an excellent photoelectric conversion efficiency of 7.80% is finally achieved, significantly higher than that of pure carbon (PC) electrode (6.36%) and even Pt counter electrode (7.05%) under the same conditions. The composite can additionally catalyze the recycling of I - /I 3 - redox couple steadily, providing more possibilities for the study of Pt-free materials about DSSCs counter electrode.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2025
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IF 4.3
Hao Liu,Hongquan Yin,Miaoting Quan,Mi Zhou,Jia Zheng,Jianghua Li
Bubble-propelled micro/nanorobots face challenges in wastewater remediation, including reliance on noble metals, restricted catalytic versatility, and limited efficacy against bacterial biofilms. This paper presents the construction of a self-propelled CoFe 2 O 4 @C nanorobot exhibiting dual enzyme-like capabilities (peroxidase, POD; catalase, CAT) by a facile carbonization method. Hydroxyl radicals (·OH) are generated through the Fenton reaction in the presence of hydrogen peroxide (H 2 O 2 ), achieving up to ∼ 100 % degradation of organic dyes (e.g., methylene blue). Additionally, oxygen (O 2 ) gas is produced via CAT-mimetic enzyme activity to propel the movement of nanorobots. Notably, the nanorobot’s cascade-generated reactive oxygen species (ROS) demonstrate dual antibacterial capabilities: (1) eradicating 99 % of planktonic E. coli in water and (2) disrupting resilient bacterial biofilms—representing a significant advancement over conventional antibacterial technologies. Furthermore, its magnetic properties enable rapid retrieval, maintaining 95 % catalytic efficiency after five cycles. In summary, the synthesized nanorobot is cost-effective and exhibits simultaneous chemical decontamination and biofilm elimination in wastewater.
研究领域:
纳米技术
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环境科学
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水处理
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抗菌材料
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纳米机器人
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催化
✓ 已验证
产品关联
DOI
高影响因子
CARBON
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2020
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IF 8.821
Yujin Li,Cuimeng Song,Jinchao Chen,Xueni Shang,Jinping Chen,Yun Li,Min Huang,Fanbin Meng
Developing low-cost and highly efficient electrochemical materials toward supercapacitor applications is crucial for energy conversion systems. In the present work, dual S, N-doped activated CoFe 2 O 4 @CNTs was successfully synthesized using carbamide and sodium thiosulfate as N and S precursors and CNTs as a substrate via a convenient two-step hydrothermal activation procedure, which presents good performance for supercapacitor. The characterization results indicate that activity S and N atoms can be successfully doped into the framework of CoFe 2 O 4 @CNTs with little impact on the inner morphology and structure. However, the electrode material of N 2 S 1 –CoFe 2 O 4 @CNTs exhibits a superior electrochemical performance with 1053.60 F g −1 at 1 A g −1 in KOH electrolyte due to synergistic effects between spinel-type metal oxides , heteroatoms and sp 2 lattice of graphitic carbon. In addition to high energy and power densities, the capacitance retention of charging-discharging reaches 93.15% at a current density of 30 A g −1 after 5000 cycles, exhibiting an outstanding cycle stability and potential lifetime in an alkaline electrolyte .
研究领域:
材料科学
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能源转换与存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Yuanming Deng,Xi Zou,Zairan Liu,Jinzhi Wang,Zhong Wang,Jiaoning Tang
Here we present a simple method to prepare a highly efficient three components nanocomposites via thermal degradation of layered double metal hydroxides (LDHs)@polyvinyl alcohol (PVA) composites. Co 7 Fe 3 /CoFe 2 O 4 @C obtained from this method is applied to activate peroxymonosulfate (PMS) to degrade polluted organics and showed excellent performance. The best removal RhB efficiency of Co 7 Fe 3 /CoFe 2 O 4 @C (Co/Fe = 1:1) is near 100% within 10 min and the lowest ions elution (∼0.05 mg/L) under pH = 7, which is also better than the performance of the precursor Co–Fe LDH. Through further cycling experiments and degradation of p -nitrophenol, the stability and catalytic performance of the catalyst were verified. Finally, free radical scavenging experiments prove ·OH and SO 4 · - radicals participating in the reaction, which are the key factors for degradation. Based on the above, the derivation of the mechanism of Co 7 Fe 3 /CoFe 2 O 4 @C (Co/Fe = 1:1) catalyzing PMS to degrade polluted organics was proposed, and we consider this catalyst has great application prospect.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Meng Liu,Yu Liu,Qiuyu Chen,Xiaoping Li,Lanxuan Wen,Xiaobao Chen,Dahu Ding,Gen Wang,Yingxin Zhao,Yang Chen,Rongzhi Chen
Inherent defects in carbon material serve as an important way to enhance peroxymonosulfate (PMS) activity, however, the mechanism that activates PMS has always been ambiguous. Herein, the pyrolysis of straw with Prussian blue nanoparticles to prepare CoFe 2 O 4 /C (Carbon) was applied to analyze the mechanism of defective amorphous-C catalyzed activation of PMS. Amorphous-C structural defects increased the specific surface area of CoFe 2 O 4 /C (from 44.19 to 108.73 m 2 /g) with triggered electronic rearrangement, resulting in more PMS adsorption. CoFe 2 O 4 /C ensured the supply of low-valent metals (≡Co 2+ and ≡Fe 2+ ) simultaneously introduced a large number of surface oxygen-containing functional groups, which facilitated free radical generation. The structural defects enhanced electron transfer contributing to the direct oxidative degradation of BPA. Thus, 100 % removal of 450 µM BPA was achieved within 40 min attributed to the combined effect of catalyst-mediated ∙OH, 1 O 2, and electron transfer. Furthermore, the CoFe 2 O 4 /C/PMS system for BPA degradation exhibited universal pH suitability (4 ∼ 10) and low metal leaching (452.10 and 19.53 μg/L for Co and Fe, respectively). This study constructs systematic support for proposing the catalytic mechanism of carbon intrinsic defects activated PMS.
研究领域:
环境科学
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材料科学
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化学工程
✓ 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）