FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
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2020
·
IF 1.648
Linghan Kong,Tingting Yu,Jianbo Zhan,Ying Zhang,Geng Li,Hao Wang,Xu Wang,Liang Cheng,Fanghui Wang
Ru-Co/CNTs catalysts are prepared by microwave-assisted heating electroless plating using Carbon nanotubes as Carrier. The structure of the catalyst was analyzed by TEM, XRD, EDS and TGA, and the performance of the catalytic alcoholysis of sodium borohydride was tested. At 25 oC, the carbon nanotube diameter is 10-20 nm, the catalyst dosage is 20 mg, the sodium borohydride concentration is 5 wt.%, and the sodium hydroxide concentration is 7 wt.%, the maximum rate of catalytic hydrogen production reaches the maximum value. At the same time, the activation energy is calculated to be 34.35 kJ · mol-1, which is much lower than the activation energy of spontaneous alcoholysis of sodium borohydride (63.0 kJ/mol).
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Jialu Shen,Weifeng Chen,Guo Lv,Zihan Yang,Jiaying Yan,Xiang Liu,Zhongxu Dai
Recently, effective hydrogen (H 2 ) evolution upon hydrolysis of different hydrogen storage materials has received much attention. Herein, graphene quantum dots-transition metal nanoparticles (GQDs-TMNPs), with high dispersibility and activity, have been successfully applied in the hydrolysis of both NH 3 BH 3 (AB) and NaBH 4 for the first time. GQDs-RhNPs, GQDs-RuNPs, and GQDs-PtNPs are very effective in the hydrolysis of AB and the turnover frequencies (TOFs) can achieve to as high as 656, 384, and 281 mol H2 ·mol cat −1 min −1 , respectively. Moreover, the synergistic effect between GQDs and TMNPs is explored, and the mechanisms of catalytic hydrolysis of AB and NaBH 4 by GQDs-TMNPs are proposed. This work not only paves the way for the development of GQDs-TMNPs nanocatalysts for the different hydrogen storage materials, but also further advances the understanding of the synergistic effects between GQDs and TMNPs.
研究领域:
材料科学
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催化化学
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氢能储存
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Si Ye,Yufeng Wang,Bohao Du,Lei Cheng,Lixian Sun,Puxuan Yan
The design of an efficient and reusable monolithic catalyst is important for catalyzing the hydrolysis of NaBH 4 to generate H 2 . Herein, an aerogel catalyst was prepared by freeze-drying of hydrazine modified cellulose nanofibers (NH 2 NH-CNF), polyvinyl alcohol (PVA) and B-doped CoP loaded sepiolite nanofibers. Further chemical cross-linking using glutaraldehyde (GA) resulted in better mechanical properties and shape recovery. Among them, the catalytic active component B-CoP@aSep has a low activation energy of 35.7 KJ·mol −1 . In addition, the optimized composite aerogel catalyst can get hydrogen generation rate ( 3534 m L m i n - 1 g c a t a l y s t - 1 ), which was maintained at 79.4% even after 5 cycles of testing. The better mechanical and catalytic properties of aerogel catalysts are mainly attributed to the overall three-dimensional layered porous structure maintained by chemical bonds and the heterogeneous interface formed by B-doped CoP.
研究领域:
材料科学
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催化化学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1568-1579
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IF 2.599
Liang Miao,Zhang Guo,Feng Yajie,Li Ruili,Hou Pei,Zhang Junsong,Wang Jianmin
Facile and robust immobilization of metal nanoparticles onto porous supporting matrix is an important issue in heterogeneous catalysis. This study reports a facile procedure for the synthesis and immobilization of small catalytic active silver nanoparticles (AgNPs) on cellulose paper (CP), which possesses interconnected fibrous structure and can be employed as cost-effective supports. Amino groups were first introduced to CP, through a silane coupling technique, to provide stable anchoring centers for silver ions. Small-sized AgNPs without aggregation were facilely synthesized and stably immobilized onto the fiber surface of CP followed by NaBH 4 reduction. The as-prepared AgNPs incorporating composites exhibited excellent catalytic activity for the reduction of 4-nitrophenol. The rate constant of the catalytic reaction was calculated to be 1.46 × 10 −2 s −1 . More importantly, these amino-modified paper-based composite catalysts can be easily recovered and reused for at least six cycles due to their enhanced mechanical and catalytic stability.
研究领域:
材料科学
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催化
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纳米技术
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2020
·
IF 3.085
Qinghao Zeng,Yanfa Cui,Lianfeng Zhu,Youwei Yao
Partially reduced SnO 2 was prepared by using NaBH 4 as reducer under room temperature. After NaBH 4 treatment, the oxygen vacancy density of SnO 2 was increased greatly. X-ray photoelectron spectroscopy, photoluminescence and electron paramagnetic resonance indicates that the obtained materials are characteristic of a high concentration of oxygen vacancies. Owing to increased oxygen vacancy concentration, these materials showed significantly high gas-sensing response to ethanol. Compared with the ethanol-sensing response value of 36.9 for pristine SnO 2 towards 300 ppm ethanol, the response value for the partially reduced SnO 2 is 120.3. This ethanol-sensing response enhancement may be attributed to the fact that the increased surface oxygen vacancy facilitates oxygen adsorption, and promotes chemical reaction on the surface.
研究领域:
材料科学
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化学工程
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传感器与执行器
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Li Sun,Qing Guo,Fan Yang,Kexin Wei,Siyuan Sun,Hongchen Liu,Junpu An,Yang Sun,Yang Guo,Linjie Wang,Yongfeng Li
Rationally designing single-atom catalysts (SACs) with high atomic efficiency and excellent catalytic performance is effective for boosting sodium borohydride (NaBH 4 ) hydrolysis activity. Herein, a series of Pt single-atom catalysts supported on Co-based compounds (Pt/CoP-B, Pt/CoP, Pt/Co 3 O 4 -B) were successfully synthesized via wet impregnation method. Pt M /CoP-B (6.2 wt% Pt loading) exhibited optimal performance at 30 °C: a turnover frequency (TOF) of 1103.26 mol H2 min −1 mol −1 Pt , a hydrogen generation rate (HGR) of 10746 mL min −1 g −1 cat which corresponded to 1.46 times higher than Pt M /Co 3 O 4 -B and 1.33 times higher than Pt M /CoP, outperforming most reported noble metal-based catalysts. It also possessed a low activation energy of 31.05 kJ mol −1 and excellent cycling stability, retaining 95.15 % of initial activity after five consecutive cycles. XPS confirmed strong metal-support interaction between Pt single atoms and CoP-B, which inducing electron transfer from Pt to Co to form electron-deficient Pt and electron-rich Co. DFT calculations revealed that Pt/CoP-B imposes a much lower energy barrier for rate-determining B–H bond cleavage and more effectively promotes H 2 O adsorption. This work offers a new paradigm for creating complementary electronic sites via single-atom-support synergy, opening a novel avenue for advanced NaBH 4 hydrolysis catalysts.
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LANGMUIR
·
2024
·
IF 3.7
Tao Xue,Hui Li,Yuying Wang,Han Miao,Xinxin Li
Synthesizing catalyst supports with appropriate compositions and structures is crucial for reducing the sizes of metal nanoparticles and enhancing their catalytic activities. In this work, a series of monolithic hyper-cross-linked supports (HCP-CC) with hierarchical pores were synthesized. The monolithic structure facilitated easy operation in catalytic reactions, while the composition and structure of HCP-CC could be tailored simultaneously by utilizing the functional cross-linking agent cyanogen chloride. Furthermore, in situ loading of nano-Ag into HCP-CC resulted in the hybrid catalyst HCP-CC-Ag. The synergy of confinement and coordination effect controlled and limited the size of nano-Ag to approximately 3 nm, classifying them as ultrasmall nanoparticles, which ensured outstanding catalytic activity. This hybrid catalyst could improve the reaction rate constant to 0.423 min–1; it efficiently promoted the degradation of organic dye and exhibited great universality and recyclability, making it a potential heterogeneous catalyst for dye wastewater treatment.
研究领域:
催化材料
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环境科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 22
·8557-8570
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IF 0
Lina Chong,Jianxin Zou,Xiaoqin Zeng,Wenjiang Ding
In the present work, two new reversible hydrogen storage composites, NaBH4 + LaF3 and NaBH4 + LaH2, have been prepared through a mechanical milling method with the aim of comparatively studying the effects of La fluoride and La hydride on the hydrogen sorption behaviors of NaBH4. Experimental investigations have shown that both La fluoride and La hydride enable reversible hydrogen sorption in NaBH4. In particular, LaF3 exhibits a superior promoting effect than LaH2, which agrees well with theoretical predictions. Surprisingly, better hydrogen sorption properties can be achieved in both systems through undergoing de-/rehydriding cycles. The reversible hydrogen storage capacity reaches up to 3.0 wt% at 238 °C and 2.9 wt% at 326 °C in NaBH4 + LaF3 and NaBH4 + LaH2 systems after the 6th dehydrogenation, respectively. In both cases, the formation of La boride plays the major role in the reversible hydrogen sorption in NaBH4. The superior promoting effect of La fluoride than La hydride upon modifications of thermodynamics and kinetics of NaBH4 should be ascribed to the following factors: (i) the formation of a thermodynamically more stable compound NaF instead of NaH reduces the overall enthalpy changes of re/de-hydriding reactions in NaBH4 + LaF3 to −31.8 kJ mol−1 H2 and 72.5 kJ mol−1 H2, respectively; (ii) the ion exchange of F− for H− leads to the reduction of the onset dehydrogenation temperature of NaBH4 to 160 °C in the NaBH4 + LaF3 composite; (iii) the F− anion favors the formation of LaB6 while H− favors the formation of LaB4. The role of functional anions and cations, de-/rehydrogenation mechanisms and nucleation modes in the two reversible hydrogen storage composites have been proposed based on experimental and theoretical analyses. The comparison study carried out in this work helps to design and search for new metal borohydride based composites for reversible hydrogen storage.
研究领域:
材料科学
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能源存储
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DOI
ENERGY & FUELS
·
2023
·
IF 5.3
Chao Tang,Guolang Zhou,Jianmei Chen,Jingzhou Yin,Yuxin Li,Cheng Liu,Qiaoqi Li,Tianshi Wang,Ziqiang Wang,Shizheng Wen,Benlin Dai,Feihu Mu,Lili Zhang
Developing nonprecious metal catalysts with fast charge transfer ability, abundant active sites, and easy recovery is of great significance toward sodium borohydride (NaBH4) hydrolysis for hydrogen (H2) production in alkaline solutions. Herein, magnetically separated nitrogen-doped carbon-supported cobalt oxide (CoxOy@NC) nanoparticles were prepared successfully by converting pyrazine-based covalent organic frameworks (COFs). Due to the porous structure and nitrogen-rich characteristics of the precursor, the prepared catalyst CoxOy@NC exhibited good conductivity and charge transfer ability. Cobalt oxide nanoparticles and nitrogen-doped carbon matrix are bonded by the Co–N bond, which makes full use of the conductivity of the substrate and the high activity of the cobalt oxide catalyst. Therefore, CoxOy@NC exhibits an excellent synergistic effect between CoxOy and NC. The H2 generation rate reaches a maximum of 2082.13 mL/min/g from NaBH4 in alkaline solutions. In addition, CoxOy@NC also exhibits good magnetic separation capability, which greatly simplifies the catalyst separation process. Density functional theory (DFT) calculation results indicate that Co2+ is the dominant active component in the heterogeneous catalyst CoxOy@NC. This work broadens new horizons for the development of COFs derivative catalysts for hydrogen production from sodium borohydride hydrolysis.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wenzhuo Li,Yuanyuan Chen,Yufeng Wang,Mengyi Wang,Lei Cheng,Lixian Sun,Puxuan Yan
Compared with micro-nano powder, the integral catalyst shows the advantage of easy recovery in practical applications. Aerogel exhibit a lightweight and porous skeletal structure, making it one of the excellent carrier options in integral catalyst. Here, the novel aerogel composite is prepared by sol-gel and freeze-drying, in which including chitosan, cellulose, carbon nanofiber and micron composite catalyst. Then, nano Co 2 B is in-situ loaded onto the surface of micron flower shaped Co(OH) 2 , forming the catalyst. The results show the hydrogen generation rate of Co 2 B@Co(OH) 2 is 8117.7 mL min −1 g −1 , higher than most of the published literatures, which is attributed to crystal and amorphous interface, nano structure and mass transfer pathway. Meanwhile, the hydrogen generation rate of the aerogel composite is 6022.8 mL min −1 g −1 , showing high exposure rate of active sites (74.2 %) and low mass loss rate (7.3 %), due to the chemical cross-linking between chitosan and glutaraldehyde, and porous and fibrous network skeleton formed between different components. The natural polymer-based aerogel exhibits the combined advantages of being biodegradable, recyclable, and serving as self-assembled micro-nano powder catalysts.
研究领域:
材料科学
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催化
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氢能
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纳米材料
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高分子科学
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高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 7
·190
·
IF 2.5
Tan Zhe,Li Wenzhuo,Shangguan Hanlu,Wang Huixing,Wang Yufeng,Cheng Lei,Sun Lixian,Yan Puxuan
Aerogels are attractive for catalytic applications due to their ultra-low density and high surface area. Here, we prepare a novel composite aerogel integrating chitosan, cellulose, carbon nanofibers, and micron-sized Co 2 B@ZIF-67 catalyst via sol-gel and freeze-drying methods. The free-standing Co 2 B@e-ZIF-67 exhibits a hydrogen generation rate of 13,701.1 mL min⁻ 1 g⁻ 1 , attributed to the uniform immobilization of Co 2 B active species within the ZIF-67 framework, which prevents agglomeration and maximizes active site exposure. When embedded in the aerogel, the catalyst achieves a hydrogen generation rate of 9,811.7 mL min⁻ 1 g⁻ 1 , with an active site exposure efficiency of 71.7% and a low mass loss of 7.9% after reaction. The aerogel’s chemically crosslinked network ensures uniform catalyst dispersion and structural stability. Moreover, the use of natural polysaccharides (chitosan and cellulose) as the aerogel skeleton provides inherent biodegradability and recyclability, making this system a promising candidate for sustainable catalytic hydrogen production. Graphical The alternative text for this image may have been generated using AI.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2026
·Vol. 40
·期 9
·e70633
·
IF 4.3
Wang Ye,Haoyue Xu,Jun Zhang,Xinru Liu,Yingxi Wang,Ling Li
The persistence and environmental hazards of antibiotic residues make the efficient removal of such pollutants from aquatic environments critically important. However, metal–organic framework (MOF) catalysts often face challenges in practical applications, such as poor structural stability and easy leaching of metal ions. In this study, using Co-MOF as a precursor, Co 3 O 4 -based catalysts rich in different concentrations of oxygen vacancies were successfully prepared through pyrolysis combined with sodium borohydride reduction and were employed for the efficient activation of peroxymonosulfate (PMS) to rapidly degrade oxytetracycline (OTC). The catalyst possessed excellent reaction kinetics, enabling rapid PMS activation and efficient OTC degradation. Radical quenching experiments and EPR analysis revealed that the degradation process follows a synergistic radical and nonradical mechanism, in which 1 O 2 and SO 4 • − play dominant roles. Furthermore, possible degradation pathways of OTC were proposed, and the ecotoxicity of its transformation products was evaluated. The results suggest that most intermediates have lower predicted toxicity than the parent compound. The catalyst also demonstrated good degradation performance and applicability in real water samples and for various pollutants. This study provides a new strategy to address the structural instability of MOF powder materials in catalytic applications.
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