JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
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IF 3.8
Yunbo Zhang,Bing Wang,Yiang Du,Wei Li,Quzhi Song,Yingde Wang
Employing inorganic nanofillers as reinforcements to modify the mechanical and electromagnetic properties of organic materials has been documented to be an extremely efficient method. Herein, an inorganic BN nanosheet (BNNS) was employed to promote the mechanical performance and optimize the crystal structure of ceramic BN materials. First, spinnable hybrid BNNS/polyborazine precursors with different mixing ratios were synthesized by high-temperature polymerization. The exfoliation and amine-functionalization of BNNSs were achieved by ball milling before they were doped into pure borazine monomer (PMAB) through a deamination reaction. The results demonstrate that the dopant of modified BNNS (aBNNS) promotes the ceramic yield of hybrid precursors (up to 66.3%) without destroying fiber spinnability. HP-0.05% shows optimal spinnability with low flow activation energy (1.04 kJ/mol). The finest diameter of green fibers spun by them could reach 5.61 µm, with a smooth and integral surface. Then the influence of aBNNS on the fiber micro-structure and mechanical performance was also measured. It is found that aBNNS benefits the improvement of fiber density (from 1.6 to 2.0 g/cm 3 ), and significantly enhances the crystallinity from 66.65% to 94.28%. Thus, the strength is increased by nearly 60% (up to 1.2 GPa) and the Young's modulus is increased by about 72% (up to 125.0 GPa). The incorporation of trace BNNS offers new insight and potential for the preparation of high-performance BN fibers.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Wenzheng Chen,Xuezhang Xiao,Jiahuan He,Zhong Dong,Xuancheng Wang,Man Chen,Lixin Chen
Sodium borohydride has attracted much attention because of its high hydrogen density, low hydrolysis temperature and safety. However, most of the current catalysts are expensive and their performances are easily attenuated. Therefore, the development of new catalysts with excellent performances and low cost is the key to its application. In this work, a novel dandelion-like CoMoNi–B/ZIF-67 catalyst with excellent performance was prepared by chemical reduction at room temperature, wherein the CoMoNi–B amorphous alloy was evenly wrapped on the ZIF-67 carrier through liquid phase reduction to form a dandelion-like composite catalyst, of which the “flower bud” ZIF-67 carrier is about 500 nm, and the “crown” flocculent amorphous alloy is about 400 nm. The as-synthesized CoMoNi–B/ZIF-67 has a dandelion-like structure, uniform distribution, large specific surface area, and exhibits an excellent catalytic activity with an apparent activation energy of 35.01 kJ/mol calculated by the Arrhenius equation . Its catalytic hydrolysis rate for sodium borohydride reaches up to 6277 (mL H 2 min/g Co and Ni) at 25 °C. Compared with traditional precious metal catalysts, this novel dandelion-like CoMoNi–B/ZIF-67 catalyst has simple preparation, low cost, and easy availability of raw materials, has great potential application for hydrogen generation in NaBH 4 hydrolysis.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Hefeng Yuan,Shumin Wang,Zizai Ma,Manab Kundu,Bin Tang,Jinping Li,Xiaoguang Wang
Developing earth abundant electrocatalyst is imperative to large-scale hydrogen production for transforming current fossil fuel-based economy into future renewable energy economy. In this paper, we report the synthesis of self-supported V O B-Co 3 O 4 /NF nanowire arrays directly grown on Ni foam, which can serve as a trifunctional catalyst for producing hydrogen and oxygen by electrolyzing water in alkaline media or producing hydrogen via hydrolyzing alkaline NaBH 4 solution. The engineered boron and oxygen defects in Co 3 O 4 nanowires prove to effectively modulate their electronic structure leading to the increased electrical conductivity and create a large quantity of electroactive sites. The resulting self-supported V O B-Co 3 O 4 /NF electrode delivers a current density of 50 mA cm −2 at overpotentials of 184 mV for hydrogen evolution reaction (HER) and 315 mV for oxygen evolution reaction (OER) in 1.0 M KOH with excellent stability and durability. The V O B-Co 3 O 4 /NF as both cathode and anode requires 1.67 V to achieve a current density of 10 mA cm −2 for overall water splitting reaction. Besides, V O B-Co 3 O 4 /NF presents much higher hydrogen generation rate (HGR) of 7055 mL min −1 g catalyst −1 with activation energy (E a ) of ca. 29.7 kJ mol −1 . for hydrolytic dehydrogenation of alkaline NaBH 4 solution, outperforming most of the reported non-noble metal-based catalysts and even precious metal catalysts.
研究领域:
材料科学
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电化学
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能源催化
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产品关联
DOI
高影响因子
ChemCatChem
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2020
·Vol. 12
·期 11
·3068-3075
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IF 4.853
Ruiqi Zhang,Huixiang Liu,Chenfeng Wang,Lincai Wang,Yanjing Yang,Yanhui Guo
Graphical Hydrogen evolution reaction : A strategy of electroless plating of transition metal boride with high boron content to fabricate binder-free catalytic electrode with superior HER activity has been realized. Facile deposition of transition metal boride (TMB) with high-boron content as highly efficient hydrogen evolution reaction (HER) electrocatalyst has been realized by a facile one-step electroless-plating (EP) method. Boron content of the TMB catalyst shows an appreciable impact on its intrinsic HER activity. NiB/NF electrode with thin amorphous nickel boride (NiB) deposition on nickel foam (NF) required overpotential of only 41.2 mV to deliver a current density of 10 mA cm −2 for HER in 1.0 M KOH alkaline electrolyte. Meanwhile, this kind of electrode also shows satisfied stability which can work at large current density of 1000 mA cm −2 for over 72 h without performance degradation. The advance on the TMB electrode may pave a way to the development of practical electrodes for water splitting.
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
ChemSusChem
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2020
·Vol. 13
·期 14
·3662-3670
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IF 7.962
Hefeng Yuan,Shiwei Wei,Bin Tang,Zizai Ma,Jinping Li,Manab Kundu,Xiaoguang Wang
Graphical Flakes make O 2 : Self-supported ultrathin CoNiB nanoflakes are prepared by a simple one-step solid-state boronation. The unique sheet-like structure, bimetallic boride components, and optimal hybrid crystalline nature enable a synergistic promotion for the catalysis of the oxygen evolution reaction with long-term stability. The development of highly active and efficient nonprecious-metal electrocatalysts for the oxygen evolution reaction is important for the design of renewable energy production and storage devices. In this work, highly dense, ultrathin Co–Ni boride nanoflakes supported on a 3 D CoNi skeleton are fabricated in situ by a simple one-step, high-temperature, solid-state boronation process. As a result of the induced high electroactive surface area and low charge transfer resistance, CoNiB-700 exhibits high catalytic activity at an overpotential of 262 ( η 10 ) and 284 mV ( η 20 ) to deliver current densities of 10 and 20 mA cm −2 , respectively, with a Tafel slope of 58 mV dec −1 in an alkaline medium towards the oxygen evolution reaction. DFT calculations show that the Ni-regulated Co–B compound has a lower rate-determining energy barrier for the *OOH intermediate than the mono-Co–B compound, which facilitates the production of more active catalytic sites for an accelerated surface charge-transfer process for the oxygen evolution reaction.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Yanhui Guo,Ruiqi Zhang,Weiju Hao,Jiankan Zhang,Yanjing Yang
The development of efficient and non-noble catalyst is of great significance to hydrogen generation techniques. Three surface-oxidized cobalt borides of Co–B–O@Co x B (x = 0.5, 1 and 2) have been synthesized that can functionalize as active catalysts in both alkaline water electrolysis and the hydrolysis of sodium borohydride (NaBH 4 ) solution. It is discovered that oxidation layer and low boron content favor the oxygen evolution reaction (OER) activity of Co–B–O@Co x B in alkaline water electrolysis. And surface-oxidized cobalt boride with low boron content is more active toward hydrolysis of NaBH 4 solution. An alkaline electrolyzer fabricated using the optimized electrodes of Co–B–O@CoB 2 /Ni as cathode and Co–B–O@Co 2 B/Ni as anode can deliver current density of 10 mA cm −2 at 1.54 V for overall water splitting with satisfactory stability. Meanwhile, Co–B–O@Co 2 B affords the highest hydrogen generation rate of 3.85 L min −1 g −1 for hydrolysis of NaBH 4 at 25 °C.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yu Wang,Guo-Hua Zhang,Xin-Bo He,Bai-Jun Yan
This paper provides a new method for preparing refractory metal diboride by reducing refractory metal oxide with Calcium hexaboride (CaB 6 ), which is prepared using B 4 C and calcium as raw materials. For refractory metal powders (M = Ti, Zr, Hf, V, Nb, Ta, Cr) which are expensive and hard to be produced by a simple route, it is more cost-effective to directly use refractory metal oxide to prepare its boride. After reacting at 1473 K for 4 h, CaB 6 and refractory metal oxide could completely react to form MB 2 , CaO and B 2 O 3 . The single-phase product with the particle size of sub-micron was obtained after acidic leaching, filtration and drying. CaB 6 could be used as a universal reducing agent to prepare metal boride.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jia-Xin Liu,Ming Yang,Ren-Feng Jiang,Xiu-Cheng Zheng,Pu Liu
Ammonia borane (AB) hydrolysis is a comparative strategy for developing the sustainable hydrogen economy . Considering the hydrolysis cannot occur kinetically at low temperature, a suitable catalyst is indispensable. In this work, the dispersed ruthenium nanoparticles are stabilized on hexagonal boron nitride (h-BN) via an adsorption-in situ reduction procedure. Various characterization techniques are adopted for elucidating the structure-performance relationship of the obtained catalysts for the hydrolytic dehydrogenation of AB. In the presence of the resultant Ru/h-BN catalysts, the corresponding turnover frequency (1177.5 min −1 ) in alkaline solution at 303 K and the apparent activation energy (24.1 kJ mol −1 ) are superior to most literature previously reported. Our work provides a facile fabrication method for metal-based catalysts, which are highly promising in chemical storage material hydrolysis.
研究领域:
化学
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材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2023
·
IF 7.3
Fan Wu,Zhankai Liu,Jian Sheng,Lihan Zhu,Wen-Duo Lu,Bin Qiu,Dongqi Wang,An-Hui Lu
Boron-based catalysts are active and selective in the oxidative dehydrogenation reaction of propane (ODHP) to propylene. Herein, the binary boron-based compounds (boron nitride, boron phosphide, boron carbide, and silicon boride) composed of boron elements and one type of other non-boron elements, and the elemental boron were systematically compared to elucidate how the non-boron elements of binary borides influence their catalytic activity in ODHP. By combined experimental and computational studies, we demonstrated that the non-boron elements can modulate the performance of catalysts by altering the ability of the B-OH site to activate dioxygen and the subsequent activation of propane. In particular, the turnover frequency (TOF) of the catalyst exhibited a high negative linear correlation with the electronegativity of the non-boron element, except for the boron phosphide. This study highlights the importance of the chemical environment around the active boron sites and provides insight into the design of efficient ODHP catalysts.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
·
IF 3.8
Shixin Zhao,Lei Zhuang,Hulei Yu,Yanhui Chu
High-entropy diboride (HEB) microfibers are in great demand for structural and functional applications in extreme conditions. Here, we synthesize (Hf, Ta, Nb, Mo, Ti)B 2 HEB microfibers through a two-step technique involving thermal decomposition of polymers and subsequent boro/carbothermal reduction for the first time. Specifically, polymer precursor microfibers are first decomposed at a moderate temperature of 773 K, followed by a high-temperature calcination at 2273 K to promote boro/carbothermal reduction. The resulting HEB microfibers, with a diameter of approximately 1 µm, exhibit a polycrystalline structure and high-compositional uniformity from nanoscale to microscale. This work opens up a new way to synthesize innovative HEB microfibers.
研究领域:
材料科学
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陶瓷工程
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纳米技术
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无机合成
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Gao Xiaofeng,Zhu Ling,Yang Feng,Zhang Lei,Xu Wenhao,Zhou Xian,Huang Yongkang,Song Houhong,Lin Lili,Wen Xiaodong,Ma Ding,Yao Siyu
Oxidative dehydrogenation of propane is a promising technology for the preparation of propene. Boron-based nonmetal catalysts exhibit remarkable selectivity toward propene and limit the generation of CO x byproducts due to unique radical-mediated C–H activation. However, due to the high barrier of O-H bond cleavage in the presence of O 2 , the radical initialization of the B-based materials requires a high temperature to proceed, which decreases the thermodynamic advantages of the oxidative dehydrogenation reaction. Here, we report that the boron oxide overlayer formed in situ over metallic Ni nanoparticles exhibits extraordinarily low-temperature activity and selectivity for the ODHP reaction. With the assistance of subsurface Ni, the surface specific activity of the BO x overlayer reaches 93 times higher than that of bare boron nitride. A mechanistic study reveals that the strong affinity of the subsurface Ni to the oxygen atoms reduces the barrier of radical initiation and thereby balances the rates of the BO-H cleavage and the regeneration of boron hydroxyl groups, accounting for the excellent low-temperature performance of Ni@BO x /BN catalysts.
研究领域:
催化
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2023
·
IF 3.6
Wei Liang,Zheng-Jun Chen,Long-Hao Ran,Lin Chen
Hydroquinine-6′-boric acid was first synthesized via a palladium-catalyzed borylation/silica gel promoted hydrolysis sequence of hydroquinine-derived triflate and bis(pinacolato)diboron. The newly designed chiral building block was subjected to the Suzuki–Miyaura cross-coupling reaction, Petasis reaction, and selenylation reaction, respectively, and all these reactions worked well to afford the corresponding 6′-functionalized hydroquinines with satisfactory results, demonstrating its extraordinary application potency.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）