INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Dongliang Chu,Weiguo Sun,Longsuo Guo,Xiaojun Yang
We obtained a series of B 6 O, B 4 C, ZrB 2 crystals at a pressure of 6 GPa and temperature of 1673–1973 K. These crystals were characterized by XRD and SEM. At a pressure of 6 GPa, the minimum synthesis temperature for B 6 O is 1673 K. The grain size of B 6 O in all the samples remained consistent at around 30–50 nm, with a uniform distribution in each sample. The bonding force between B 6 O grains is weak, and the B 6 O grain size remains relatively stable, showing minimal change with increasing temperature and time. In the sample synthesized at 1973 K, B 6 O icosahedra (multiply twinned particles, MTPs) with a diameter of 12 μm, B 4 C particles with a diameter of 25 μm, and flaky ZrB 2 were observed. We conducted theoretical calculations on B 6 O and B 4 C using density functional theory (DFT).
研究领域:
材料科学
·
无机非金属材料
·
高压物理
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计算材料学
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结构表征
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Ningqiang Shi,Mingyang Wu,Zhijun Li,Jinchang Meng,Chuncheng Ban,Luochen Qu,Mingyu Zhang,Ling Li
Boron nitride nanotubes (BNNTs) offer remarkable potential for thermal management and optoelectronic applications due to their high aspect ratio, excellent thermal conductivity, electrical insulation, and mechanical strength. However, achieving high-quality, well-aligned BNNTs (ABNNTs) remains a critical challenge, largely due to limited understanding of their growth mechanism. Here, we develop a three-dimensional flow–force–thermal coupling model that reveals how gas convection and vertical temperature gradients synergistically drive the aligned growth of ABNNTs. We elucidate the essential roles of thermophoretic and shear forces in guiding nanotube orientation. Based on this insight, a synthesis strategy integrating computational fluid dynamics and thermo-solid coupling analysis is proposed and experimentally validated. The resulting ABNNTs exhibit high crystallinity, low defect density, and near-ideal BN stoichiometry. When applied as thermal interface materials (TIMs) in LED devices, ABNNTs reduce the core temperature by approximately 17.9 °C and enhance thermal dissipation efficiency by ∼20.7 %, outperforming disordered BNNTs and commercial TIMs. This work not only clarifies the fundamental mechanism underlying ABNNT alignment, but also establishes a rational design strategy for advanced thermally conductive materials and their integration into high-performance electronic systems.
研究领域:
材料科学
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纳米科技
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热管理
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电子器件散热
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功能材料
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固态物理
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Zhen-Cheng Wu,Fang-Xu Tian,Rui Xiao,Mao-Yin Ran,Wenlong Liu,Wen-Tong Chen,Sheng-Ping Guo
The study of infrared nonlinear optical (NLO) materials with wide band gaps and high laser induced damage thresholds (LIDTs) is an urgent and challenging topic. Here, we report the NLO properties of CsRESiS4 (RE = Sm, Gd–Ho), which were synthesized by the reactive flux CsCl assisted RExOy–B–S routine. The structure of CsRESiS4, [CsS7] pentagonal bipyramids are orderly arranged to populate the interlayer space created by [RES7] monocapped triangular prisms consolidated [SiS4] tetrahedra. They all exhibit wide band gaps of 3.51–3.95 eV, high LIDTs of 3.6–5.5 × AGS, and NLO activity, with CsHoSiS4 possessing the largest band gap among rare-earth chalcogenides. The theoretical calculation results indicate that [RES7] monocapped triangular prisms are the main source of NLO activity and have a wide band gap. This work provides an effective case for exploring wide band gap infrared NLO materials.
研究领域:
材料科学
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凝聚态物理
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无机化学
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光学材料
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功能晶体
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Meihong Fan,Minghao Wang,Wenbo Bi,Yuzhu Jiang,Hui Chen,Xingquan He,Qingqing Pan
The development of efficient and durable alkaline water splitting electrocatalysts is vital for advancing the renewable hydrogen economy, a key pillar of sustainable energy systems. Here, we present an entropy-driven synthesis of phase-pure cobalt boride (CoB) nanosheets by a molten salt-assisted pyrolytic method. The obtained CoB, grown in situ on carbon cloth, can serve as an efficient electrocatalyst toward the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) simultaneously. Remarkably, it requires only overpotentials of 110 mV for HER and 240 mV for OER to drive a current density of 10 mA cm −2 , respectively, addressing the critical need for cost-effective catalysts in renewable energy conversion. Experiments in combination with theoretical calculations reveal that interstitial B atoms can modulate the adsorption energy of Co sites and optimize the Co–H bond strength through the electron transfer between Co and B, thereby enhancing intrinsic HER activity. While in the OER, CoB nanosheets undergo in situ transformation into amorphous CoOOH, which acts as the highly active catalytic phase for the OER. This work not only provides a promising bifunctional electrocatalyst for alkaline water splitting but also offers fundamental insights into the catalytic mechanisms, paving the way for rational design of advanced electrocatalysts.
研究领域:
能源材料
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电化学
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纳米技术
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催化
·
材料科学
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可再生能源
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Zhaojin Li,Zezhao Li,Chenze Di,Di Zhang,Qiujun Wang,Huilan Sun,Qujiang Sun,Fei Yuan,Ranran Li,Bo Wang
Oxygen (O) and Boron (B) heteroatom doping has emerged as a promising strategy to enhance the capacitive performance of activated carbon (AC) for supercapacitors. However, the synergistic mechanism between these heteroatoms remains ambiguous due to intertwined morphological and compositional changes during conventional doping processes. This study employs a stepwise doping methodology to independently control O and B concentrations while preserving the structural integrity of AC. Through sequential high-temperature B doping and low-temperature oxidation, dual-doped AC (AC-O-B) retains comparable specific surface area and pore structure to pristine AC. Electrochemical evaluations reveal that O-B double doping has no significant effect on the double-layer capacitance, but it greatly improves the pseudocapacitance. Mechanistic analysis demonstrates that O doping introduces abundant C-O groups and facilitating the formation of BC 2 O structures via B integration. The presence of C-O groups and BC 2 O structure not only enhance surface wettability but also optimize charge transfer kinetics and redox-active site density. This work provides critical insights into heteroatom co-doping strategies for designing high-performance carbon-based supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xue Liu,Jianguo Deng,Yingchun Lu,Xin Li,Fuhan Mai,Lanxiang Ji,Xiaofeng Bai
This study focused on radiation shielding materials for nuclear applications, employing a vacuum-assisted impregnation method to optimise the microstructure and establish a synergistic shielding mechanism combining scattering and absorption. Specifically, melamine sponge (MS) is first modified using KH550 to form –NH 2 active sites on its pore surfaces. Subsequently, it is immersed in a composite solution to construct “reflective capsules”. Finally, gradient encapsulation is performed using polyborosiloxane and polyurethane. The results show that compared with pure MS, the tensile strength of this material doubles, the elongation increases by 179 %, and its shielding capabilities against 59.6 keV γ-rays and 0.025 keV thermal neutrons increase by 1442 % and 1593 % respectively, reaching 27.14 % and 43.35 %. Additionally, it has a photothermal peak temperature of 78.5 °C and stable thermal response. Furthermore, relying on the three-dimensional elastic network of the MS and the conductive pathway of MXene, the material achieves a piezoresistive coefficient of 5.27 kPa −1 , demonstrating potential for application as a pressure-sensitive sensor. Through microstructure design and functional integration, this work makes the material suitable for complex scenarios such as nuclear facility maintenance and emergency rescue.
研究领域:
核医学
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生物材料学
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放射防护
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功能材料
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纳米复合材料
·
传感器材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yuanyuan Wu,Yuhui Sun,Bozhen Li,jihui Lang,Guangbo Che,Xingjing Zhang,Chunbo Liu
Water splitting requires the development of efficient and economical materials that catalyze hydrogen evolution reaction (HER) in diverse and complex environments. At present, HER in multi-environment mainly relies on noble metal catalysts, because the tolerance of non-noble metals is greatly limited under acidic conditions. In this study, we report the synthesis of sulfur (S)-anion-doped rhenium diboride (ReB 2 ) nanosheets using a molten salt-assisted method. This novel approach facilitates the uniform incorporation of S anions into the ReB 2 lattice. This leads to enhanced electrocatalytic activity. The resulting S-doped ReB 2 nanosheets exhibit superior performance with remarkable activity and stability across a wide pH range in HER. Specifically, overpotential of 144 mV, 158 mV, and 139 mV (1.0 M KOH) are required in 1.0 M PBS, 0.5 M H 2 SO 4 , and 1.0 M KOH, respectively, to achieve a current density of 10 mA/cm 2 . with long-term durability over 50 h in all three media. Due to their unique porous structure, the nanosheets exhibit a large electrochemical active area, exposing more active sites, promoting the diffusion of electrolyte and the generation and release of gas bubbles on the catalyst surface, and they can be used as efficient bifunctional electrocatalysts for overall water splitting. In addition, the introduction of anion S effectively regulates the electronic structure of Re, thereby enhancing the catalytic reaction kinetics and intrinsic catalytic performance.
研究领域:
材料科学
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电化学
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纳米技术
·
能量转换
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催化
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Zi-Chun Fan,Zhuang Li,Xiang Bai,Xian-Yong Wei,Yierxiati Dilixiati,Qian-Qian Kong,Ji Zhao,Yong-Hui Feng,Zhi-Min Zong,Jun-Long Wang
The catalytic hydroconversion (CHC) of benzyloxybenzene (BOB) and oxydibenzene (ODB), two typical lignite-related model compounds (LRMCs) representing α-Ο-4 and 4-O-5 model linkages , have been investigated using uniformly dispersed Ni 15 /HY prepared by a three-step method. The cleavage of >CH-O- bridged bonds in BOB and partial hydrogenation of ODB are considered as a crucial first step, and the target reactions in this work are to produce complete hydrodeoxidized ring saturation products. Through the exploration of reaction mechanism, H + /H - and biatomic active hydrogen, as the main hydrogen species involved in the reaction, play an important role in the CHC of BOB and ODB. Herein, the synergic effect between the hydrogenation of nickel nanoparticles and the acidic function of Y -type zeolite improves the CHC performance, resulting in Ni 15 /HY displaying proficient catalytic activity and selectivity for the CHC of BOB and ODB. Under the optimal reaction conditions, BOB and ODB can be completely converted to cyclanes over Ni 15 /HY, and the main products are dicyclohexylmethane (57.6 %) and cyclohexane (92.4 %), respectively. The developed Ni 15 /HY can not only promote the hydroconversion of BOB and ODB to produce ring-saturated products, but also undergo the rearrangement reaction to produce two- or three-ring cyclanes, which is desirable to upgrade LRMCs to high-density hydrocarbon fuels .
研究领域:
化学工程
·
燃料化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Jiandong Hao,Ling Li,Bin Zhang,Ningqiang Shi,Tingwei Yan,Jinchang Meng
We used dry-wet transfer to prepare boron nitride nanoribbons (BNNRs) film. The effects that the different BNNRs film areas by dry transfer, the different areas and thicknesses of BNNRs film by wet transfer on BNNRs deep ultraviolet (DUV) detector were investigated, respectively. There is an excellent capability of detection and sensing for dry transfer DUV detector. The photocurrent rises with the area of the film. The maximum photocurrent ( I phmax ) is 34 pA at 1.64 mW/cm 2 (0.3 × 0.7 cm 2 , 30 mg). Rise and fall time are around 0.38s/0.41s. The responsivity and detectivity are 0.23μA/W and 5.57 × 10 7 (0.41 mW/cm 2 , V bias = 10V). The direct transfer of the MCE filter membrane by wet transfer can control the size and thickness of the film. The I phmax becomes larger with the thickness of the BNNRs film ( I phmax : 171 pA). And the time response is about 0.73s/0.72s, the responsivity and detectivity are up to 0.71μA/W and 1.72 × 10 8 (0.41 mW/cm 2 , V bias = 10V). However, it does not have a better ability to sense the DUV light than dry transfer. Therefore, different transfer methods can be applied to various requirements. This provides a good prospect for the high-performance DUV detectors.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chong Wan,Suhang Chen,Xinglong Liu,Yushu Xiong,Zhao Qin,Jianbin Li,Fengqi Zhao,Kangzhen Xu
To enhance energy release of boron-based metastable intermixed composites (MICs), a series of B-based MICs were constructed successfully by a facile one-step sol-freeze-drying (SFD) method, where copper oxide (CuO) was employed as oxidant. The structure, morphology, chemical state and specific surface area of B-based MICs were investigated by several characterization technologies, and their reactivity and combustion performance were further studied by various experimental tests. The results reveal that B and CuO nanoparticles are dispersed evenly on a nest network braided by the molecular interaction between polyvinyl pyrrolidone (PVP) and nitrocellulose (NC), and the constant volume combustion heat of B-based MICs even reaches 8956.6 ± 76.6 J·g −1 when PVP (1.25 wt%) and NC (5.0 wt%) were added into B/CuO, respectively. The heat value is about 1.7 times as big as pristine B/CuO (5345.5 ± 36.1 J·g −1 ) and approaches to that of raw B NPs (10335.5 ± 507.8 J·g −1 ). Moreover, the condensed phase residues of three composites were collected and confirmed to be Cu and Cu 2 O, while the smallest particle size distribution of product proves that the combustion of B/CuO/NC(NC: 5.0 wt%, PVP: 1.25 wt%) is most complete. So the unique nest network can eliminate particle aggregation, shorten the transfer distance of mass and heat and improve the “solid − solid” thermite reaction between B and CuO NPs. This work will provide a new strategy for promoting the application of boron.
研究领域:
材料科学
·
燃烧化学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Yi Shen,Mingzheng Yang,Chao Zhu,Haizhong Zhang,Renlan Liu,Jun Wang,Qile Fang,Shuang Song,Baoliang Chen
The activation of peroxymonosulfate (PMS) to generate singlet oxygen (1O2) for the removal of emerging organic pollutants (EOPs) from complex aqueous environments has garnered widespread attention. However, the low efficiency and selectivity of current PMS activation for 1O2 generation result in suboptimal EOP degradation. To enhance the selectivity of PMS activation and promote the non-radical pathway, non-metal heteroatoms with varying electronegativities were introduced to disrupt the symmetrical coordination structure of Fe active sites in Fe single-atom catalysts. The results showed that, in the B-Fe1/GLCNs/PMS system, the pseudo-first-order kinetic rate for bisphenol A (BPA) degradation reached 4.435 min–1, which is 7.4 times higher than that of the unmodified control group. Experimental and theoretical calculations demonstrated that the doping of non-metal heteroatoms altered the electron density and distribution at the Fe active sites, thereby modulating the adsorption configuration of HSO5– and increasing the selectivity for PMS activation to generate 1O2. Additionally, the degradation of EOPs by 1O2 produced intermediate products with lower biological toxicity, and 1O2 demonstrated strong anti-interference capability. The change in HSO5– morphology improved the rate of 1O2 generation. This study provides deep insights into designing high-performance PMS activation catalysts via non-metal doping to regulate the electronic structure of active sites for a selective non-radical pathway.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Wu Yuhan,Zhao Yuying,Yuan Qixin,Sun Hao,Wang Ao,Sun Kang,Waterhouse Geoffrey I. N.,Wang Ziyun,Wu Jingjie,Jiang Jianchun,Fan Mengmeng
Carbon nanomaterials show outstanding promise as electrocatalysts for hydrogen peroxide (H 2 O 2 ) synthesis via the two-electron oxygen reduction reaction. However, carbon-based electrocatalysts that are capable of generating H 2 O 2 at industrial-level current densities (>300 mA cm −2 ) with high selectivity and long-term stability remain to be discovered. Herein, few-layer boron nanosheets are in-situ introduced into a porous carbon matrix, creating a metal-free electrocatalyst (B n -C) with H 2 O 2 production rates of industrial relevance in neutral or alkaline media. B n -C maintained > 95% Faradaic efficiency during a 140-hour test at 300 mA cm −2 and 0.1 V vs. RHE, and delivered a mass activity of 25.1 mol g catalyst −1 h −1 in 1.0 M Na 2 SO 4 using a flow cell. Theoretical simulations and experimental studies demonstrate that the superior catalytic performance originates from B atoms with adsorbed O atoms in the boron nanosheets. B n -C outperforms all metal-based and metal-free carbon catalysts reported to date for H 2 O 2 synthesis at industrial-level current densities.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）