CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuanmeng Lou,Zhaotian Ba,Zhaodi Yuan,Jian Li,Cui Li,Lili Ma,Xiujuan Wang,Xin Wen,Pingan Song
The development of carbon fiber reinforced epoxy resin (EP/CF) composites with good balance on flame retardancy and mechanical properties remains a critical challenge. Inspired by the rod@sheets hierarchical structure of corncobs, herein a novel CF/PO 4 3− intercalated NiFe-LDH hybrid (CF@NiFe-LDH-P) was successfully fabricated via in-situ growth of NiFe-LDH nanosheets on CF surfaces, followed by PO 4 3− intercalation via an ion-exchange process. Subsequently, the as-synthesized CF@NiFe-LDH-P was incorporated with EP matrix. The resultant EP/CF@NiFe-LDH-P composites exhibited remarkable improvements in flame retardancy, including the limiting oxygen index (LOI) value of 36.8 %, UL-94 V0 rating, and a 66.8 % reduction in the peak of heat release rate (PHRR). According to the structure/composition analysis of residual char, the flame-retardant mechanism was mainly ascribed to the synergistic effect between NiFe-LDH and PO 4 3− , where NiFe-LDH catalyzed the carbonization of EP fragments into graphitized carbon, while PO 4 3− enhanced the cross-linking of char network through phosphate ester bonds. Meanwhile, the flame retarded EP/CF@NiFe-LDH-P composites displayed superior mechanical performances. Compared to the pristine EP/CF, EP/CF@NiFe-LDH-P displayed outstanding mechanical properties in Young's modulus (+26.9 %), tensile strength (+26.2 %) and impact strength (+39.4 %). These enhancements were attributed to the corncob-like structure of CF@NiFe-LDH-P, which established strong interfacial adhesion with EP via hydrogen bonding. This work presents an innovative bio-inspired strategy to achieve synergistic optimization of flame retardancy and mechanical performances in EP/CF composites, paving the way for their expanded applications in high-performance engineering and advanced technological fields.
研究领域:
材料科学
·
聚合物复合材料
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阻燃技术
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纳米材料
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiangxiang Chen,Guoxin Ding,Yan Liu,Yunwang Xing,Weipeng Qi,Guojun Cheng
In answer to the need for materials that absorb electromagnetic waves with great efficiency, this study reports the design and synthesis of a core–shell structured GM@NiFe-LDH@PANI composite. The material exhibits outstanding electromagnetic wave (EMW) absorption performance through multi-component synergy and multi-mechanism coupling. XRD and XPS analyses confirmed the material’s crystalline structure and chemical composition, while SEM images revealed the core–shell morphology, showing NiFe-LDH nanosheets uniformly anchored on glass microspheres (GM) surfaces, forming a hydrangea-like structure. Subsequent incorporation of polyaniline (PANI) further increased the heterojunction interface. Electromagnetic property measurements demonstrated that GNP-2 achieved optimal impedance matching at a thickness of 1.71 mm, resulting in a strong reflection loss of −52.86 dB and an effective absorption bandwidth of 4.72 GHz. The hydrangea-like NiFe-LDH structure enhances magnetic loss and promotes scattering and reflection through its porous framework, intensifying interfacial polarization effects. The conductive PANI shell, with its exposed active sites, facilitates EMW absorption through dipole polarization and conductive loss mechanisms. This core–shell porous design synergistically optimizes dielectric and magnetic losses. This composite material demonstrates considerable potential for electromagnetic compatibility applications in radar stealth, modern communication systems, and renewable energy devices.
研究领域:
材料科学
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电磁学
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纳米技术
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复合材料
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电磁兼容性
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Xiaoyu Chen,Xiaoshuai Yu,Chuncheng Yang,Guoyong Wang
The oxygen evolution reaction is more challenging than the hydrogen evolution reaction in overall water splitting, not only because the four-electron reaction is more complex but also because the oxidizing environment of the anode reaction is more destructive to the electrode material. Generally, such destruction results in the formation of an oxide film that hinders the transition of electrons and subsequently decelerates the succeeding reaction. This paper proposes a transition layer for self-supporting electrodes (NiFe LDH@NiCoP/NF) in which NiCoP grows between the NF and NiFe LDH. The implementation of NiCoP as a transition layer, showcasing excellent antioxidation capability and conductivity, effectively reduced overpotentials and consequently enhanced the catalytic performance. Benefiting from this transition layer, in a 1.0 M KOH, the NiFe LDH@NiCoP/NF catalyst exhibited outstanding OER and HER performance, requiring only 281 and 102 mV, respectively, to achieve 100 and 10 mA cm −2 , and also exhibited a cell voltage for overall water splitting of 1.56 V at 10 mA cm −2 .
研究领域:
电化学
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材料科学
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催化
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能源存储与转换
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jinlong Zhang,Yuxiang Jin,Zhiqiang Xu,Yizhi Du,Yawen Xu,Xiaoli Ren,Bing Xue,Daoxin Liu,Yongfu Zhu,Fangfei Li
Modulating the electronic state of nickel is a crucial strategy for activating lattice oxygen participation in the oxygen evolution reaction (OER). Herein, a sol–gel-assisted hydrothermal strategy is employed to synthesize sulfate-intercalated NiFe-LDH (SG-S-NiFe-LDH), where SO42– anions are stably incorporated into the interlayer galleries to modulate Ni oxidation states. This interfacial regulation reconstructs the local electronic environment, enabling the formation of high-valent Ni species and favoring a lattice-oxygen-mediated (LOM) pathway. Structural characterizations confirm successful anion incorporation, while post-OER XPS evidences Ni3+/Ni4+ enrichment. Mechanistic studies, including pH-dependent kinetics and O–O intermediate trapping, further validate LOM dominance. SG-S-NiFe-LDH exhibits outstanding activity with a low overpotential of 177 mV at 10 mA cm–2, a Tafel slope of 32.98 mV dec–1, and long-term durability exceeding 170 h. Post-OER HRTEM and ICP confirm structural robustness and minimal Ni loss. Density functional theory calculations reveal that sulfate intercalation raises the Ni d-band center, strengthens *OOH adsorption, and reduces the *OOH → *OO barrier to 0.53 eV. Moreover, a water-splitting device using SG-S-NiFe-LDH as the anode achieves 100 mA cm–2 at 1.66 V with stable 28 h operation. Faradaic efficiency above 98% with an O2:H2 ratio of 1:2 confirms high reaction selectivity. This work demonstrates a targeted anion intercalation strategy to modulate transition-metal states, unlock lattice oxygen reactivity, and advance efficient and durable water electrolysis.
研究领域:
电化学
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材料科学
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催化
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纳米技术
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能量转换
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表面科学
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理论化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yujie Xiang,Zhengting Wang,Ying Zhang,Rui Gao,Yonggui Tao,Chisheng Deng,Shukang Deng,Jinsong Wang,Kaiyuan Shen
The environmentally friendly and sustainable characteristics of hydrogen generation through water electrolysis have drawn considerable interest. However, the inherently retarded reaction dynamics of the oxygen evolution reaction (OER) limit its efficiency. Consequently, advancing high-performance and cost-effective OER electrocatalysts significantly strengthen the water electrolysis’ performance. A composite nanostructured catalyst is successfully developed by integrating S-doped NiMoO 4 with NiFe-layered double hydroxides (LDH). Characterization results indicate that the NiMoO 4 -decorated NiFe-LDH increases catalytic efficiency by providing additional active sites, while the introduced S further enhances electrical conductivity. Electrochemical tests reveal that the OER capability of S-NiMoO 4 @NiFe-LDH under alkaline conditions is exceptional, achieving a negligible overpotential of 256 mV at 50 mA cm −2 and a minimal Tafel slope of 27.8 mV dec −1 , along with outstanding durability at 10 mA cm −2 (200 h). Furthermore, electrochemical probe experiments and mechanistic analyses reveal the possible potential reaction route of the catalyst during the OER, playing a crucial role in clarifying how the adsorbate evolution mechanism (AEM) and the lattice oxygen mechanism (LOM) synergistically enhance catalytic performance. This study affords a compelling strategy for establishing stable and efficient catalysts for electrochemical water oxidation.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Yixiong Wu,Yanqi Xu,Cunjun Li,Hai Wang,Xinyu Wang,Aimiao Qin,Haiqing Qin,Linjiang Wang
One-step selectively photocatalytic phenol hydroxylation to produce Dihydroxybenzenes (DHB) is an attractive and challenging strategy. However, the rapid recombination of photogenerated carriers existed in single component photocatalyst seriously hinders the photocatalytic efficiency. The heterojunction strategy can optimize the band structure of the photocatalyst, and effectively improve the carriers' separation and transfer during the photocatalytic process. Herein, we successfully designed and prepared a 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure photocatalyst by coupling TiO 2 nanorods with Ni 3 Fe 1 -LDH nanosheets for the photocatalytic phenol hydroxylation to produce DHB. The results showed that the 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure had a suitable energy band structure for the photocatalytic phenol hydroxylation and the heterostructure accelerated the carriers’ separation and transfer. Meanwhile, the high porosity and abundant active sites were conducive to the adsorption of H 2 O 2 and the photogenerated carriers transfer efficiency from the photocatalyst to H 2 O 2 . The 3D TiO 2 @Ni 3 Fe 1 -LDH core-shell heterostructure showed excellent photocatalytic performance of phenol hydroxylation, where the phenol conversion was 48.6%, and the selectivity of DHB was 81.1% at 25 °C and 4 h of light illumination. Furthermore, the as-prepared photocatalysts exhibited good stability after four cycles of experiment. This work provided a convenient and efficient method for the green synthesis of DHB.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jinfeng Li,Tuo Li,Qianwen Wang,Bo Tian,Zhigang Li,Jianwei Zhang,Wenze Li,Wa Gao,Nan Zhang,Haifeng Gu,Hongtao Zhao
The development of high-efficiency adsorption materials for efficient removal of U(VI) from nuclear wastewater has become a concern of environmental protection. LDHs, as adsorbent materials, lack functional groups, resulting in low adsorption performance. Herein, a novel and excellent radiation stable HPO 4 2− -intercalated NiFe-LDH material (NiFe-LDH-P(x)) is synthesized by in-situ co-precipitation method. The effect of HPO 4 2− content on the U(VI) performance of NiFe-LDH-P(x) is studied in detail. The results reveal that intercalation of HPO 4 2− increases the interlayer spacing and specific surface area of NiFe-LDH, as well as the active sites between the interlayers. Therefore, NiFe-LDH-P(x) with moderate HPO 4 2− content (10 %) can reach highest U(VI) adsorption capacity (350.88 mg·g −1 ). FTIR, SEM and XPS analyses educe that the efficient adsorption of uranium on NiFe-LDH-P(10 %) is mainly attributed to complexation, electrostatic attraction and ion exchange. In summary, NiFe-LDH-P(10 %) has great potential in removing uranium from wastewater, which provides a new idea for the synthesis of efficient adsorbents.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2025
·Vol. 18
·期 14
·3592
·
IF 3.2
Wangchuang Zhu,Xinghua Zhang,Qi Zhang,Lungang Chen,Xiuzheng Zhuang,Longlong Ma
With the continuous consumption of fossil energy and the related environmental problems, clean energy, especially the hydrogen energy-derived water electrolysis, has attracted wide attention. However, as a result of the high energy consumption of water electrolysis and the limitations of single-function catalysts, there is an urgent need for cheap and simple-to-make bifunctional catalysts. In this work, based on the NiFe-LDH that is usually used for OER (Oxygen Evolution Reaction), doping of heteroatoms was carried out and a bifunctional catalyst could be then prepared using biomass as the carbon source. The preparation of catalyst precursors and in situ reduction were performed through the coupling process of hydrothermal and pyrolysis to enhance the electrolytic activity of the catalyst. Results showed that the overpotentials required to reach a current density of 10 mA·cm−2for the HER and OER processes were 305.2 mV and 310.4 mV, respectively, which are superior to the commercial catalysts. In the subsequent characterization, the structural characteristics of the catalyst support and their structure–activity correlation with active metals were systematically investigated by TEM, XRD, and XPS analysis, providing mechanistic insights into the catalytic behavior. The basic catalytic mechanisms of HER and OER were also obtained: the HER process was due to the formation of a Ni3Fe alloy structure during catalyst preparation, which changed the electronic structure of the catalyst, while the OER process was induced by the formation of a NiOOH intermediate. The research results are expected to provide new ideas and data support for the preparation of bifunctional catalysts.
研究领域:
能源催化
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 45
·2203852
·
IF 15.153
Baoshan Zhang,Shuo Liu,Shaojie Zhang,Yu Cao,Huili Wang,Chengyu Han,Jie Sun
Sustainable production of hydrogen from seawater electrolysis has attracted much attention in recent years. Considering that Cl - might corrode metal substrate by crossing through the covered catalyst, the conventional Ni(II)Fe(III)-layered double hydroxide (NiFe-LDH) loaded on metal substrate, as a favorable oxygen evolution catalyst, cannot be directly used for seawater electrolysis. Herein, an anti-corrosion strategy of PO 4 3- intercalation in NiFe-LDH is proposed, in which the highly negatively charged PO 4 3- in the interlayers can prevent the Ni substrate from Cl - corrosion by electrostatic repulsion. In order to verify the anti-corrosion effect, the two electrodes of the pristine NiFe-LDH and the PO 4 3- intercalated NiFe-LDH are evaluated in a solution with high Cl - concentration. PO 4 3- can effectively hinder the migration of Cl - between the interlayers of NiFe-LDH, thus the corrosion life of the PO 4 3- intercalated NiFe-LDH is more than 100 times longer than that of the pristine NiFe-LDH. The improvement of stability is attributed to the inhibition effect of Cl - passing through the interlayers of NiFe-LDH, leading to the protection of Ni substrate. This work provides a design strategy for the catalysts loaded on the metal substrate, which has excellent Cl - -corrosion resistance and can be widely used in hydrogen generation from seawater electrolysis.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yan Wang,Xiaoyue Fu,Yuxiu He,Xiyuan Li,Yingjie Feng
Anion exchange membrane water electrolysis (AEMWE) is a promising hydrogen production technology for clean energy storage and conversion applications. However, in practical applications, AEMWE still face various challenges, such as slow reaction kinetics and a poor durability. This study simultaneously performed chronopotentiometry for 672 h in a half-cell (200 mA cm −2 ) and 170 h in a single-cell (500 mA cm −2 ) to comprehensively evaluate the durability of a NiFe-LDH/NF electrode prepared via the hydrothermal deposition of a NiFe-layered double hydroxide (NiFe-LDH) on nickel felt (NF). The half-cell test results showed that after 672 h, the voltage degradation was only 2 mV compared to the initial voltage (1 h). The single-cell test results showed that below 30 h, the cell underwent an activation–stabilisation process, while after 170 h, the voltage degradation was only 45 mV compared to that at 30 h. In situ electrochemical Raman spectroscopy revealed that the formation of Ni(Fe)OOH at high potentials enhanced the oxygen evolution reaction activity of the NiFe-LDH/NF electrode. Meanwhile, TEM and SEM morphological observations showed that the three-dimensional flower-like cluster structure formed by the NiFe-LDH sheets was responsible for the high durability of the NiFe-LDH/NF electrode in both half-cell and single-cell tests.
研究领域:
材料科学
·
能源转换与存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yidong Sun,Xingpu Wang,Qiang Fu,Chunxu Pan
It is of great significance to construct heterojunctions using industrially produced co-catalysts. The direct Z-scheme composite photocatalyst provides an effective separation of photogenerated carriers. Herein, a kind of novel 2D/3D direct Z-scheme NiFe-LDH/Zn0.5Cd0.5S is prepared. Compared with fresh catalysts, the NiFe-layered double hydroxide (LDH)/Zn0.5Cd0.5S composite exhibits advantages including excellent visible light response ability and photoelectric performance and improved H2 evolution rate by 11.6 times. Combining with theoretical calculations, ESR, XPS, and experimental results, the direct Z-scheme mechanism of the photocatalytic reaction is proposed. There is a channel for electron transfer between Zn0.5Cd0.5S and NiFe-LDH, and the electrons of Zn0.5Cd0.5S directly combine with the valence band holes of NiFe-LDH. Finally, the electrons remaining on NiFe-LDH can reduce H+ to generate H2. This process effectively achieves separation of photogenerated carriers and increases photocatalytic H2 evolution.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Shuaiwu Zhu,Jianmin Wang,Haijin Li,Jiajia Cai,Yongtao Li,Jing Hu,Yitao He,Yong Zhou
One crucial pattern to vigorously develop renewable energy is to exploit high-performance oxygen evolution reaction (OER) electrocatalysts. Therefore, we constructed a nanoscale heterogeneous structure catalyst, NiFe-LDH/Co-NC (LDH = layered double hydroxide; Co-NC cobalt nanocrystal), consisting of ultrasmall NiFe-LDH nanosheets and Co-NC matrixes carbonized from ZIF-67. In 1 M KOH, NiFe-LDH/Co-NC-2 requires only an overpotential of 282 mV to catalyze a current density of 10 mA cm–2 and also has a Tafel slope of 64 mV dec–1, surpassing those of the typical OER electrocatalyst RuO2. Co-NC was able to supply a porous structure and anchoring sites, including improving the electrical conductivity of NiFe-LDH. Modified NiFe-LDH has a highly dispersed nature and therefore exposes more active sites. Moreover, the accelerated electron-transfer process caused by strong interaction between NiFe-LDH and Co-NC dramatically optimized the energy barrier of the OER. This work provides significant guidelines to design a high-performance OER of NiFe-LDH catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）