JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 35
·16625-16640
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IF 3.553
Zhang Zewu,Zhou Jiamin,Wei Hanlin,Dai Yifan,Li Shijia,Shi Haojun,Xu Gang
Abstract Efficient design and preparation of cost-effective and binder-free bifunctional electrocatalysts to accelerate the hydrogen and oxygen evolution reaction (HER and OER) are critical for overall water splitting. In this work, 3D hierarchical NiFe-LDH/FeCoS 2 /CFC electrodes were synthesized for the first time. The carboxyl groups derived from acid treating promote the homogeneously coated FeCoS 2 on CFC, giving rise to the strongly coupled FeCoS 2 /CFC hybrid. The NiFe-LDH exhibited the vertical growth feature on the FeCoS 2 /CFC composite, which can efficiently expose the active edges sites. Due to unique structure and synergistic effect between the components, the NiFe-LDH/FeCoS 2 /CFC exhibits significant electrocatalytic activity and stability under alkaline environments, with overpotentials of 190 and 308 mV to achieve 10 mA cm −2 for OER and HER, respectively, providing it as a promising electrocatalyst for water splitting reaction. In addition, we deeply studied the synergistic catalytic mechanism of NiFe-LDH/FeCoS 2 /CFC, explaining the reasons leading to the improved catalytic performance of HER and OER. Graphic abstract
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 MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Runrun Cheng,Yan Wang,Xiaochuang Di,Zhao Lu,Ping Wang,Xinming Wu
At present, the problem of electromagnetic wave (EMW) pollution is critical, and the design of high-performance absorbers is of great significance. Based on the synergy between dielectric and magnetic losses, and between multicomponents in heterostructures, the development of light-weight absorbers with a strong absorption capability and multiple scattering is a promising strategy to achieve high-performance absorbers. In this work, CoFe-MOF precursors with a bouquet-like structure were prepared via the hydrothermal method, and Co 7 Fe 3 /C and Co 9 S 8 /Fe/CoS 2 /C composites were obtained through a carbonization and sulfuration treatment during the high-temperature pyrolysis process, respectively. The experimental and theoretical results show that the Co 9 S 8 /FeCoS 2 /C composite has a better EMW absorption performance, and its optimal reflection loss (RL) value is -53.9 dB at a low filler loading of 20 wt.%, which is due to the S doping that enhances the interface polarization relaxation process and improves the impedance matching characteristics. Moreover, the Co 9 S 8 /FeCoS 2 /C composite can be as candidates of high-efficiency absorbers in extreme application environments.
研究领域:
材料科学
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电磁学
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环境科学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2022
·
IF 7.336
Qin Wu,Ruichen Chen,Pengju Su,Daxin Shi,Yaoyuan Zhang,Kangcheng Chen,Hansheng Li
Carbon-based materials derived from metal-organic framework compounds have tunable chemical composition , morphology, and electrochemically active surface combined with good electrical conductivity and stability. In this work, Fe(OH) 3 grows on a zeolitic imidazolate framework , 2-Methylimidazole cobalt salt (ZIF-67), through oxidation and deposition. The Co 9 S 8 /NC@FeCoS 2 /NC composites with hollow yolk shell structure (HYS-Co 9 S 8 /NC@FeCoS 2 /NC) is prepared through solvothermal sulfidation combined with high-temperature carbonization using ZIF-67@Fe(OH) 3 as the precursor. A dye-sensitized solar cell assembled with HYS-Co 9 S 8 /NC@FeCoS 2 /NC as a counter electrode achieves a photovoltaic conversion efficiency of 7.07% (PCE Pt = 7.36%). The reason for this phenomenon is that the hollow yolk shell structure of Co 9 S 8 /NC@FeCoS 2 /NC material has a high specific surface area, which affords a good deal of active sites and promotes the contact between electrolyte and catalytic sites. The Fe-Co bimetal center synergies with each other to catalyze the reduction of iodide ion, showing a high catalytic activity. Besides, the material has good electrochemical stability in iodide-based electrolysis.
研究领域:
材料科学
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电化学
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太阳能
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纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhu Xian,Zhihao Lu,Zihan Zhang,Yaning Liu,Yuchen Wang,Chaoyang Li,Chengshuai Jiang,Yingying Cai,Gongqiang Li,Xiao Huang,Gang Lu
The catalyst of FeCoS 2 particles were coated with a thin layer of poly(methyl methacrylate) (PMMA) for catalysis enhancement. • An exceptional CO production rate of 72.21 ± 3.37 mmol·g −1 ·h −1 was achieved, roughly 3.5 folds of pristine FeCoS 2 . • This catalysis enhancement is attributed to multiple factors, including enhanced light absorption, promoted interfacial charge transfer, optimized mass transportation, and improved reaction kinetics. Photocatalytic conversion of carbon dioxide (CO 2 ) to fuel, including carbon monoxide (CO), using solar energy offers a sustainable path to addressing energy and environmental crises. However, the efficiency of this conversion is far below the requirement for practical applications. In this work, an exceptional record-high CO production rate of 72.21 ± 3.37 mmol·g −1 ·h −1 was achieved by coating the nanocatalyst of FeCoS 2 particles with a thin layer of poly(methyl methacrylate) (PMMA). This CO production rate is roughly 3.5 folds of the photocatalytic activity of pristine FeCoS 2 . This PMMA coating-induced enhancement can be attributed to the synergistic effects of multiple factors, including enhanced light absorption, promoted interfacial charge transfer, optimized mass transportation, and improved reaction kinetics. Overall, this study establishes a simple, straightforward and versatile strategy for designing and preparing highly efficient photocatalysts, with potential applicability across diverse photocatalytic reactions. Download: Download high-res image (123KB) Download: Download full-size image
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DOI
高影响因子
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