JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Ma Cankun,Guo Xiaonan,Yuan Mengfei,Wang Xinrui,Du Dou,Chai Chunpeng,Zhang Youwei,Ma Huiling
Effective structural design and component optimization is critical for enhancing the performance of electromagnetic wave (EMW) absorbing materials. In this study, CoFe Prussian blue analog/graphene oxide composite (CoFe-PBA/GO) was designed by electrostatic adsorption, in situ growth and co-precipitation deposition and carbon layer-coated CoFe/reduced graphene oxide composite (CoFe@C/RGO) was synthesized via pyrolysis. The carbon layer-coated CoFe (CoFe@C) with core-shell structure is successfully integrated onto the reduced graphene oxide (RGO) surface, effectively preventing the aggregation of RGO nanosheets. The incorporation of RGO facilitates the formation of a continuous conductive network and improves conduction loss. The optimized CoFe@C/RGO-15 has a minimum reflection loss ( RL min ) of − 47.88 dB at 9.42 GHz with a thickness of 2.1 mm and effective absorption bandwidth (EAB) is 3.77 GHz (11.98–15.75 GHz) at 1.6 mm. This study provides a novel approach for fabricating of an EMW-absorbing material with dielectric loss and magnetic loss, offering significant insights into low-frequency magnetic attenuation mechanisms. Graphical
研究领域:
材料科学
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电磁波吸收
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纳米复合材料
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微波工程
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DOI
高影响因子
Small
·
2025
·Vol. 21
·期 45
·e08103
·
IF 12.1
Yan Yin,Sipu Wang,Bin Chen,Anqi Zhang,Lianqin Wang,Fuqiang Bai,Tianyou Wang,Junfeng Zhang,Zhizhao Che
Direct water electrolysis using renewable energy offers a promising approach to green hydrogen production. Fluctuations in power supply cause gas bubbles to accumulate on the electrode surface, leading to segmented plug flow that hampers electrode activity and durability. To tackle the ongoing challenges of gas bubble accumulation in electrocatalytic systems, this study presents a NiMoO 4 @CoFe-LDH composite electrode with a 3D layered hierarchical structure designed to establish an effective gas-liquid-solid triple-phase interface. This distinct heterogeneous structure features a superhydrophilic surface, which enhances the active surface area and bubble generation sites, promoting oxygen bubble release and improving charge transfer. This bubble behavior synergistically enhances the high efficiency, dynamic response, and low load adaptability of the electrolyzer by avoiding high-current mass-transfer clogging and enhancing the adaptability to dynamic operating conditions. In 1 m KOH, the catalyst achieves a 202 mV (η@10 mA cm −2 ) overpotential, with high stability of over 1000 h. The Pt/C||NiMoO 4 @CoFe-LDH anion-exchange membrane electrolyzer operates efficiently and stably under fluctuating operating conditions (1.70 V@1.0 A cm −2 , 30,000 cycles), providing a new paradigm for green hydrogen anode design in scenarios of fluctuating supply of renewable energy.
研究领域:
电化学
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氢能
·
材料科学
·
可再生能源系统
·
催化
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Liu Aohua,Chen Jianhong,Wang Gang,Yu Feng,Peng Banghua
Zinc-air batteries (ZABs) are regarded as promising energy storage devices next-generation, but it is limited by their sluggish oxygen reduction/evolution reactions (ORR/OER). Therefore, it is highly necessary to explore inexpensive and more efficient transition metal based electrocatalyst for facilitating OER and ORR. Consequently, in this paper, transition metal phosphating compounds (Co 2 P 2 O 7 /FeP 2 @C) was synthesized by high-temperature treatment CoFe terephthalic acid chelating with phytic acid (PA). The resulting nanostructures of Co 2 P 2 O 7 /FeP 2 coated with P-doped carbon exhibit outstanding electrocatalytic performance, achieving OER overpotential of 405 mV at 10 mA cm −2 and an initial ORR potential of 0.83 V versus reversible hydrogen electrode. Meanwhile, the ZABs prepared by Co 2 P 2 O 7 /FeP 2 @C exhibited high specific capacity (817.76 mAh g −1 ) and long cycle stability (60 h). Here, the well-designed terephthalic acid unified with PA, not only produced phosphide at elevated temperatures, but also enhanced catalyst porosity caused by abundant hydroxyl groups in PA, potentially increased specific surface area. Additionally, PA introduced P-doped carbon matrix, which effectively modulated the carrier's electronic structure, introduced more defect as active sites and combined with porous structure to enhance the electrocatalytic effect. This work introduced an environmentally friendly method to synthesize transition metal phosphide on porous carbon matrix, and it is anticipated to find extensive applications in electrocatalysis. Graphical abstract
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Chunmiao Fan,Dengjie Zhong,Yunlan Xu
In this study, CoFe-PBA-loaded NiFe-LDH (NiFe-LDH@CoFe-PBA) was synthesized and employed to catalyze peroxymonosulfate (PMS) to degrade rhodamine B (RhB). That the composite material was successfully synthesized was confirmed through complementary characterization techniques including energy-dispersive spectrometry, Fourier transform infrared spectroscopy, and X-ray diffraction analyses. The elimination efficiency of RhB reached 98.99% within 15 min under the conditions of an initial RhB concentration of 50 mg L–1, a catalyst concentration of 0.2 g L–1, a PMS concentration of 0.2 g L–1, and an initial pH of 6.36. The characterization results revealed that CoFe-PBA improved the dispersibility of NiFe-LDH and exposed more active sites, which made NiFe-LDH@CoFe-PBA have higher current density and electron transfer ability. In the composite, Co, Fe, and Ni were the catalytic centers to activate PMS, and the redox between Co3+/Co2+, Fe3+/Fe2+, and Ni3+/Ni2+ enhanced the production of reactive oxygen species (ROS: 1O2, O2•–, •OH, and SO4•–). Among them, 1O2 was determined to be the predominant reactive species responsible for RhB degradation. This study proposes a novel methodology for designing and synthesizing simple, efficient, stable, and environmentally friendly heterogeneous metal-based catalysts.
研究领域:
环境化学
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材料科学
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催化化学
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水处理技术
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纳米材料
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环境污染与控制
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhi Liu,Yu Dai,Xin Han,Chengyi Hou,Kerui Li,Yaogang Li,Hongzhi Wang,Qinghong Zhang
Electrochemical water splitting stands out as a promising avenue for green hydrogen production, yet its efficiency is fundamentally governed by the oxygen evolution reaction (OER). In this work, we investigated the growth mechanism of CoFe hydroxide formed by in situ self-corrosion of iron foam for the first time and the significant influence of dissolved oxygen in the immersion solution on this process. Based on this, the CoP 2 -FeP 4 /IF heterostructure catalytic electrode demonstrates exceptional OER activity in a 1 M KOH electrolyte, with an overpotential of only 253 ± 4 mV (@10 mA cm −2 ), along with durability exceeding 1000 h. Density functional theory calculations indicate that constructing heterojunction interfaces promotes the redistribution of interface electrons, optimizing the free energy of adsorbed intermediate during the water oxidation process. This research highlights the importance of integrating self-corroding in-situ growth with interface engineering techniques to develop efficient water splitting materials.
研究领域:
材料科学
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电化学
·
理论计算
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DOI
PubMed
高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·162-169
·
IF 8.897
Zhong Dazhong,Li Tan,Wang Dong,Li Lina,Wang Jiancheng,Hao Genyan,Liu Guang,Zhao Qiang,Li Jinping
Oxygen evolution reaction (OER) is crucial for hydrogen production as well as other energy storage technologies. CoFe-layered double hydroxide (CoFe-OH) has been widely considered as one of the most efficient electrocatalysts for OER in basic aqueous solution. However, it still suffers from low activity in neutral electrolyte. This paper describes partially oxidized CoFe-OH (PO-CoFe-OH) with enhanced covalency of M-O bonds and displays enhanced OER performance under mild condition. Mechanism studies reveal the suitably enhanced M-O covalency in PO-CoFe-OH shifts the OER mechanism to lattice oxygen oxidation mechanism and also promotes the rate-limiting deprotonation, providing superior OER performance. It just requires the overpotentials of 186 and 365 mV to drive the current density densities of 1 and 10 mA·cm −2 in 0.1 M KHCO 3 aqueous solution (pH = 8.3), respectively. It provides a new process for rational design of efficient catalysts for water oxidation in mild conditions.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 10
·期 4
·2201817
·
IF 6.389
Junfeng Zhang,Haotian Liu,Weikang Zhu,Bin Chen,Runfei Yue,Shuoyao Yin,Na Xie,Ran Li,Yan Yin
The design of the efficient, flexible air electrode for enhancing the Zn-air batteries (ZABs) performance is vital in developing a new portable rechargeable power supply. Emerging research indicates that non-precious metal materials have promising activity for oxygen reduction/evolution in alkaline conditions while constructing a high-performance and reliable electrode is still a big challenge at the present stage. In this work, a bimetal doped zeolitic imidazolate framework (ZIF) film is synthesized by fast current-driven synthesis (FCDS) on a thin carbon nanotube film (CNTF). After carbonization at 950 °C, CoFe-N-C nanofoam formed on the CNTF, resulting in binder-free, flexible electrodes. It exhibits excellent activity and stability toward oxygen reduction and evolution. The CoFe-N-C/CNTF-based liquid-state ZAB shows an output power density of 294 mW cm −2 . When applied in solid-state ZAB, the flexible battery shows high power density and excellent cycling stability.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Chuncai Kong,Weijie Lei,Bosen Lei,Fangzhao Pu,Ge Wang,Xiaojing Zhang,Cheng Zhou,Zhimao Yang
High-performance, nonprecious metal catalysts with special morphologies and easy-to-recycle properties are essential for the treatment of environmental pollutants. Herein, CoFe nanoparticle-decorated reduced graphene oxide (RGO) catalysts were designed and successfully fabricated, and the catalyst was then used to reduce 4-nitrophenol into 4-aminophenol. Outstanding catalytic properties with a reduction rate constant of 4.613 min–1 were achieved due to the synergistic properties of the CoFe metal alloy and the high-conductivity RGO components in the catalysts. In addition, the catalyst was conveniently recovered via magnets due to its inherent magnetic properties. The facile preparation, outstanding catalytic performance, structural stability, and low material costs make the CoFe/RGO nanocatalyst a promising candidate for potential applications in catalysis.
研究领域:
材料科学
·
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Bohan An,Jipeng Dong,Hui Su,Weilong Liu,Ning Li,Yangqin Gao,Lei Ge
Transition metal phosphides (TMPs) with platinum -like electronic construction are emerging as prospective options for hydrogen evolution reaction (HER) in alkaline conditions. Still, the robust bonding strength between TMP with the related intermediates prevents a further enhancement in its electrocatalytic activity . This paper uses V doping modification strategy to adjust the electron distribution on the surface of bimetallic phosphides and improve their HER capability. When V–CoFeP is employed as a dual functional electrocatalyst under the environment of 1 M KOH, the cathode HER performance is 53 mV (η10) and the anode oxygen evolution reaction (OER) performance is 175 mV (η50). For overall water decomposition, a dual electrode alkaline battery coupled with a dual functional electrocatalyst V–CoFeP needs only 1.845 V to achieve η50 which can hold its excellent electrocatalytic capability for 25 h. Finally, DFT calculations show that formation P vacancies and V doping induces an internal electron redistribution in V–CoFeP. Therefore, this work shows new insights for synthesizing highly active and stable electrocatalysts by adjusting the TMP electronic structure to achieve overall water decomposition.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9618-9627
·
IF 3.3
Wan Rong,Rui Dang,Yunfei Chen,Kang Huang,Jiuyang Xia,Bowei Zhang,Jianfei Liu,Meixin Li,Qigao Cao,Junsheng Wu
Layered double hydroxides (LDHs) are promising catalysts for water electrolysis. Many efficient LDHs have been produced by adjusting their composition and structure. Herein, by using only sodium carbonate as a precipitator, we prepared gram-scale CoFe LDHs rich in carbonate anions depending on the incomplete double hydrolysis between carbonate and metal ions under atmospheric pressure. Owing to the flexible iron valence state, the coordination environment, and electronic structure of cobalt and iron in CoFe LDHs can be modified. The catalytic performance was substantially improved for the oxygen evolution reaction (OER) owing to the exposure of more metal active sites and the increase in the charge transfer rate. By adjusting the molar ratios of Co and Fe, Co1Fe1 LDH with excellent OER performance, which reached 10 mA cm−2 at an extremely low overpotential (270 mV) and a very low Tafel slope (42.7 mV dec−1), was obtained. Our work can pave the way for low cost high-performance LDHs in water electrolysis.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 32
·11297-11302
·
IF 4
Yin Huang,Yaoyao Pan,Xiaoyu Huang,Guangzheng Xu,Xiuhua Wang
Finding effective and affordable non-noble metal catalysts is one of the most important yet difficult tasks because of the sluggish kinetics of the oxygen evolution reaction (OER). Therefore, we synthesized vanadium-doped CoFe PBA nanosheets on nickel foam in a single step to change the electronic structure with metal doping. The sheet structure facilitates charge transfer, while vanadium doping modifies the electronic structure to enhance the catalytic activity. With just a 229 mV overpotential needed in the OER reaction to reach 10 mA cm−2, the as-synthesised electrocatalyst demonstrates high electrocatalytic activity. The produced electrocatalyst can operate at a current density of 10 mA cm−2 for 12 h, and it displays outstanding stability even at a high OER current density of 100 mA cm−2 for 12 h. This study will contribute to the development of efficient and affordable non-noble metal-based electrocatalysts.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 34
·12038-12048
·
IF 4
Lu Wang,Yi Liu,Xiaoheng Liu,Wei Chen
Powder electrocatalysts for oxygen evolution reactions usually need adhesives for electrocatalytic performance tests, leading to the increase of resistance, reduction of catalyst loading, and easy stripping of the catalyst under long-time or high current operation. In this study, Ce-doped CoFe layered double hydroxides were uniformly grown on nickel foam by a one-step hydrothermal route. A nanostructured self-supported electrode Ce-CoFe-LDH/NF without adhesive was obtained directly, which has a regular nanoneedle morphology with a length of ∼1.2 μm and tip width of ∼20 nm. Adopting Ce3+ ions with a large radius to partially displace Fe3+ ions with a small radius produced lattice distortion and more defects in the host layer of CoFe-LDH, whereby possessing the great potential to enhance catalytic behaviors. Once used as an electrocatalyst for the oxygen evolution reaction, Ce-CoFe-LDH/NF shows an outstanding electrocatalytic performance, including an optimized overpotential of 225 mV at 10 mA cm−2, a decreased Tafel slope of 34.34 mV dec−1, and a low charge transfer impedance of 2.4 Ω in 1 M KOH electrolyte. Moreover, the overpotential of the working electrode increased by only 0.04 V after 24 hours and was maintained at a current density of 50 mA cm−2. These results demonstrate a low-cost strategy compared to using noble metal OER electrocatalysts. Thus, this study highlights a ready universal approach to fabricate high-performance supported catalysts for energy-related applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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