RSC Advances
·
2019
·Vol. 9
·期 26
·14580-14585
·
IF 3.049
Hui Miao,Kelong Ma,Huiru Zhu,Kun Yin,Ying Zhang,Yumin Cui
The hydrolysis of ammonia borane is a promising strategy for hydrogen energy exploration and exploitation. The in situ produced hydrogen could be directly utilized in hydrogenation reactions. In this work, a bimetallic nickel–cobalt material with porous structure was developed through the pyrolysis of ZIF-67 incorporated with Ni ions. Through the introduction of Ni(NO3)2 as an etching agent, the ZIF-67 polyhedrons were transformed into hollow nanospheres, and further evolved into irregular nanosheets. The bimetallic NiCo phase was formed after pyrolysis in a nitrogen atmosphere at high temperature, with the decomposition and release of organic ligands as gaseous molecules under flowing nitrogen. The obtained bimetallic NiCo porous materials show superior catalytic performance towards hydrolytic dehydrogenation of ammonia borane, thereby nitrobenzene with reducible functional groups can be reduced with high selectivity to the corresponding aniline.
研究领域:
催化化学
·
能源材料科学
·
纳米材料合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ping Dai,Yuchao Yao,Enzheng Hu,Dongyan Xu,Zhongcheng Li,Chuansheng Wang
In this work, a composite consisting of ZIF-67 and graphene oxide (GO) was successfully synthesized by a facile in-situ synthesis method and applied in hydrogen release from the methanolysis of sodium borohydride (NaBH 4 ). Physicochemical properties of pure ZIF-67 and the ZIF-67@GO composites are well characterized by XRD, BET, SEM and HRTEM. It was observed that the ZIF-67 crystals are intimately anchored on GO sheets. An increase of GO in the composite led to a marked decrease of the BET surface area and an increased average pore size. However, the ZIF-67@GO precursor with high GO doping exhibited much higher activity toward the methanolysis of NaBH 4 , which suggests that the good conductivity of GO is beneficial to improve the catalytic performance. The ZIF-67@GO precursor experienced a structure reconstruction during the methanolysis reaction due to the presence of reducible Co 2+ . Moreover, the reduced ZIF-67@GO displayed a slightly higher activity as compared to the pristine composite and retained excellent durability after five cycles. A possible mechanism for the hydrogen generation from the methanolysis of NaBH 4 using a ZIF-67@GO catalyst was proposed.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Chen-Xu Chen,Jing-Pei Cao,Nai-Yu Yao,Wen Tang,Wei Jiang,Chuang Zhang,Xiao-Yan Zhao,Xiao-Yu Qiao,Tungalagtamir Bold
Improving the catalytic efficiency and catalyst life of Pt/Al 2 O 3 catalyst for methylcyclohexane dehydrogenation is of great significance for the study of organic liquid hydrogen storage. In this work, the promotion effects of Ga and Ce on the substantial improvement of catalytic stability and activity over the Pt / Al 2 O 3 during the methylcyclohexane dehydrogenation were investigated. The catalyst with optimizing Ga and Ce loading (1.5 wt%) exhibits ∼99.76 % selectivity and H 2 evolution rate of 2102 mol/g Pt /min at 300 °C. In 100 h long-time reaction, the conversion of methylcyclohexane remains around 75 % with no significant decrease. The characterization results show that introducing proper amount of Ga and Ce helps Ga 3+ cations incorporate into the lattice structure of CeO 2 that increase concentration of oxygen vacancies and CeO 2 reducibility in the catalyst, which boost the capability of methylcyclohexane dehydrogenation and tolerance for coke formation. Thus, the excellent stability and activity are achieved over the GaCe-modified catalyst. This study may share new light on the rational construction of highly efficient Pt-based catalysts for methylcyclohexane dehydrogenation.
研究领域:
催化化学
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能源材料
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表面科学
·
纳米催化
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氢储能
·
材料化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Chenlu Wang,Xiaojiang Hou,Duode Zhao,Danting Li,Xinlei Xie,Peixuan Zhu,Xiaohui Ye,Guoquan Suo,Guang Yang,Yanling Yang
Magnesium-based solid hydrogen storage technology is anticipated to enhance the extensive utilization of hydrogen energy due to its secure and reversible hydrogen storage characteristics. Nonetheless, the intrinsic high Mg–H bond energy and surface dissociation energy of MgH 2 result in severe operating conditions and reduced efficiency. This work proposes a NiFe/CoFe nanocatalyst exhibiting a dual-site multichannel effect, which is incorporated into MgH 2 for surface catalysis using a brief high-energy ball milling technique. The surface-catalyzed composites can release over 90 % of the potential hydrogen storage capacity with a single activation. The MgH 2 -10 wt%NiFe/CoFe composite can absorb 4.88 wt% of H 2 at 150 °C. The release peak temperature of H 2 of MgH 2 -5wt.%NiFe/CoFe was markedly decreased to 281.01 °C, representing a reduction of 162.6 °C relative to ball milled state MgH 2 (BM-MgH 2 ). The Ea for dehydrogenation was markedly decreased to 71 kJ/mol, attributed to the dual-site adsorption of NiFe/CoFe catalysts and the multi-channel diffusion within the multiphase system. These factors facilitate the absorption and dissociation of H-atoms, thereby enhancing the kinetic properties of MgH 2 . This study provides valuable insights for designing multicomponent composite metal nano-catalysts and the advancement of MgH 2 hydrogen storage composites.
研究领域:
材料科学
·
能源储存技术
✓ 已验证
产品关联
DOI
高影响因子
BIOMATERIALS
·
2025
·
IF 12.9
Zhiqiang Li,Junwei Su,Xianzhen Dong,Xinyue Liang,Yuanfang Huo,Junwei Yang,Lesan Yan,Aixi Yu,Honglian Dai
Following peripheral nerve injury (PNI), the early inflammatory response induces excessive production of reactive oxygen species (ROS), resulting in severe damage to the regenerative microenvironment, which poses a huge challenge to the autonomous regeneration of nerves. Exogenous nerve grafts are often needed to assist and guide nerve regeneration. In recent years, nerve conduits (NGCs) with directional structures and favorable bioactivity have made significant progress, but single-function scaffolds still cannot meet the multiple needs of reconstructing an ideal regenerative microenvironment. In this study, a construction strategy for hydrogen-releasing electroactive nerve conduit scaffolds was proposed. The system uses poly(3S-methylmorpholine-2,5-dione-co-ε-caprolactone) [P(MMD-CL)] conduits coated with helically wound metal magnesium wires as a source of gaseous transmitters that continuously release hydrogen. Under the action of an external alternating magnetic field, the magnesium wire coil can form a closed loop and generate weak electrical stimulation (ES). The conduit is further filled with photo-crosslinked lipoic acid-gelatin (Gel-LA) microgels to synergistically regulate cell behavior and assist tissue regeneration. In vitro studies have shown that the system exhibits multiple biological effects, including reducing ROS levels, regulating inflammatory responses, promoting angiogenesis, and maintaining mitochondrial function, reflecting the potential roles of H 2 , ES, and Mg 2+ in regulating the regenerative microenvironment. In vivo , the establishment of a 15 mm sciatic nerve defect model further verified the significant efficacy of the H 2 delivery system in promoting nerve morphology and functional recovery. In summary, this study constructed a multifunctional nerve conduit scaffold with gaseous transmitter delivery, electrical activity regulation, and injectable microgel filling, which provides a new therapeutic idea for improving the post-injury microenvironment and promoting peripheral nerve regeneration, and provides an experimental basis for gas molecule-guided nerve repair strategies.
研究领域:
生物医学工程
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神经生物学
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组织工程
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再生医学
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生物材料学
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神经修复学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Ying-Hua Zhou,Suqin Wang,Yu Wan,Jingjing Liang,Yu Chen,Shizhong Luo,Cheng Yong
Low-cost metallic nanoparticles as catalysts with good performance are highly desired for the development of hydrogen storage materials . In this work, ceria-doped CuNi nanoparticles were successfully immobilized on the surfaces of reduced graphene oxide (rGO) by a simple co-reduction approach in aqueous solution at room temperature, characterized by ICP-OES, XRD , TEM, SEM-EDS and XPS techniques. The as-synthesized CuNi-CeO 2 /rGO nanocomposites with various metal contents had been employed as heterogeneous catalysts for the hydrolytic dehydrogenation of ammonia borane (NH 3 BH 3 , AB) under mild conditions. The optimal catalyst of Cu 0.8 Ni 0.2 -CeO 2 /rGO with CeO 2 content of 13.9 mol% exhibited an excellent catalytic activity with the exceedingly high TOF value of 34.4·mol H2 ·mol catalyst −1 ·min −1 at 298 K. The apparent activation energy was calculated to be 19.1 kJ mol −1 , even lower than most of noble-metal-based catalysts for AB dehydrogenation. The detailed kinetics of AB hydrolysis catalyzed by Cu 0.8 Ni 0.2 -CeO 2 /rGO had been investigated on different concentrations of catalyst, substrate and temperatures. Moreover, the obtained in situ hydrogen from AB hydrolysis can be further applied to reduce 4-nitrophenol with a high TOF value of 8.1 min −1 at room temperature. The high catalytic activity of Cu 0.8 Ni 0.2 -CeO 2 /rGO would be contributed to the small size of CuNi-CeO 2 NPs, metal-metal synergy, and the metal-support interaction.
研究领域:
材料科学
·
催化化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yutong Wang,Lun Pan,Yixin Chen,Guoqiang Shen,Li Wang,Xiangwen Zhang,Ji-Jun Zou
Ni-based alloys are considered as the efficient catalyst for hydrogen-storage materials decomposition. Herein, we applied an in-situ melt-quenching method to dope Mo in Ni-based alloy for catalytic hydrogen evolution from hydrogen-storage materials. Importantly, Mo doped Ni-based catalyst exhibits more than 6 times higher TOF value than that of pure Ni both in AB hydrolysis and hydrazine decomposition, because Mo acts as an electron donor to improve the reducibility of Ni. Hydrogen evolution kinetics were studied over a range of temperatures (303–353 K) and initial feed concentrations (catalyst/hydrogen-storage materials (wt/wt) ratios = 0.2–10). Under optimal reaction conditions, the H 2 evolution rate reaches 1.92 mol H 2 /(mol cat min) and 0.05 mol H 2 /(mol cat min) in the hydrolysis of ammonia borane and decomposition of hydrazine, which are 6.42 and 6.44 times higher than undoped Ni catalyst, respectively. And the apparent activation energy of ammonia borane hydrolysis and hydrazine decomposition were evaluated to be 26.66 ± 3.31 kJ/mol and 40.01 ± 3.38 kJ/mol, respectively.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jinglun Du,Yangwenting Ou,Yuanyuan Li,Changhua Wang,Xintong Zhang,Yichun Liu
Artificial nitrogen fixation consumes 1–2% of the world’s total energy output, yet most current approaches exhibit energy conversion efficiencies (ECE) below 3%, resulting in substantial energy losses. In addition to thermodynamic constraints, a key limitation lies in the inefficient utilization of short-lived reactive intermediates, particularly hydroxyl radicals (•OH), which play a crucial role in oxidative nitrogen conversion but typically exhibit nanosecond-scale lifetimes. Herein, we demonstrate that Zn(OH)2, integrated within an in-liquid plasma nitrogen fixation system, stabilizes •OH radicals via surface adsorption, prolonging their lifetime up to 9 s. This stabilization enables sustained nitrogen oxidation at the solid–liquid interface, achieving an electrical-to-chemical ECE of 11.08%, which is the highest reported ECE to date for water-assisted nitrogen fixation. Concurrently, enhanced oxygen utilization facilitates hydrogen evolution at an industrial-grade production rate of 71.34 mmol cm–2 h–1 with a low energy consumption of 0.419 MJ mol–1. These findings offer a new strategy for managing short-lived radical species in oxidative processes and establish a promising platform for sustainable, energy-efficient nitrogen fixation coupled with hydrogen generation.
研究领域:
环境化学
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等离子体化学
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材料科学
·
能量转换
·
催化
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jiao Li,Tianshu Li,Yanwei Zeng,Changcheng Chen,Honglei Guo,Bing Lei,Ping Zhang,Zhiyuan Feng,Guozhe Meng
Magnesium alloys are widely used in aerospace and automobile industries because of their lightweight and high strength properties . However, the occurrence of surface corrosion limits their application. Among the protection methods of magnesium alloys, the sol-gel method has received a growing attention recently because of its green economy, high efficiency, and stability. However, the sol-gel method cannot provide corrosion protection for an extended duration in saline solutions. In this study, a novel sol-gel coating via catechol/lysine (CA/Lys) polymerization has been prepared via a facile method and systematically investigated. The CA/Lys co-deposition process was studied by ultraviolet-visible (UV-Vis) spectroscopy. Corrosion performances of the coating were evaluated in aqueous 0.1 M NaCl by electrochemical impedance spectroscopy (EIS) and hydrogen evolution measurements. The experimental results showed that the CA/Lys-modified sol-gel coating provided corrosion protection for up to 18 days, while the unmodified sol-gel coating failed after only 3 days of testing. The polymerized CA/Lys was adsorbed by and then diffused into the sol-gel coating by filling in the macropores or nanopores and the nano-SiO 2 cross-linked network, greatly improving the compactness of the coating. In addition, albeit the thickness of CA/Lys modified coating being only 9 µm, this material was able to provide a long-lasting corrosion protection. This study introduced a novel approach to greatly improve the corrosion resistance of the sol-gel film for magnesium alloys by adopting phenolamines to modify the sol-gel for anticorrosion. This approach can provide a new strategy for Mg alloy corrosion protection.
研究领域:
材料科学
·
腐蚀工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2023
·
IF 2.7
Min Xu,Xuan Zhang,Baowen Dong,Wenjuan Wang,Zhihuan Zhao
Atherosclerosis is induced by the persistent inflammation of the arterial wall. The regulation of inflammation through active drugs can mitigate atherosclerotic lesions, but the therapeutic outcome is limited due to its insufficient efficacy and stability. Herein, a PdH-Te nanozyme with excellent reactive oxygen species (ROS) scavenging capability is designed for anti-inflammatory therapy, thereby preventing foam cell formation to alleviate atherosclerosis. As expected, the PdH-Te nanozyme shows outstanding multiple antioxidant enzyme activities and sustained hydrogen release properties. Benefiting from decreased ROS levels by enzyme catalysis, PdH-Te nanozyme significantly suppresses the pro-inflammatory cytokines for atherosclerosis treatment. Taken together, the presented results demonstrate that inhibition of inflammation based on PdH-Te nanozyme can effectively treat atherosclerosis, identifying an attractive strategy against cardiovascular diseases.
研究领域:
纳米技术
·
心血管疾病
·
炎症
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Theranostics
·
2024
·
IF 12.4
Hang Zhou,Zhongyuan He,Youde Cao,Lei Chu,Bing Liang,Kexiao Yu,Zhongliang Deng
Background: The repair of osteoporotic bone defects remains challenging due to excessive reactive oxygen species (ROS), persistent inflammation, and an imbalance between osteogenesis and osteoclastogenesis. Methods: Here, an injectable H 2 -releasing hydrogel (magnesium@polyethylene glycol-poly(lactic-co-glycolic acid), Mg@PEG-PLGA) was developed to remodel the challenging bone environment and accelerate the repair of osteoporotic bone defects. Results: This Mg@PEG-PLGA gel shows excellent injectability, shape adaptability, and phase-transition ability, can fill irregular bone defect areas via minimally invasive injection, and can transform into a porous scaffold in situ to provide mechanical support. With the appropriate release of H 2 and magnesium ions, the 2Mg@PEG-PLGA gel (loaded with 2 mg of Mg) displayed significant immunomodulatory effects through reducing intracellular ROS, guiding macrophage polarization toward the M2 phenotype, and inhibiting the IκB/NF-κB signaling pathway. Moreover, in vitro experiments showed that the 2Mg@PEG-PLGA gel inhibited osteoclastogenesis while promoting osteogenesis. Most notably, in animal experiments, the 2Mg@PEG-PLGA gel significantly promoted the repair of osteoporotic bone defects in vivo by scavenging ROS and inhibiting inflammation and osteoclastogenesis. Conclusions: Overall, our study provides critical insight into the design and development of H 2 -releasing magnesium-based hydrogels as potential implants for repairing osteoporotic bone defects.
研究领域:
生物医学工程
·
材料科学
·
骨科
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2017
·Vol. 8
·期 1
·1-7
·
IF 12.124
Lin Jin,Li Zhi,Kan Jian,Huang Shijun,Su Weiping,Li Yadong
Catalytic oxidative C–H bond functionalization reactions that proceed without requiring stoichiometric amounts of external oxidants or pre-functionalized oxidizing reagents could maximize the atom- and step-economy in chemical syntheses. However, such a transformation remains elusive. Here, we report that a photo-driven catalytic process enables decarboxylative C–H trifluoromethylation of (hetero)arenes with trifluoroacetic acid as a trifluoromethyl source in good yields in the presence of an external oxidant in far lower than stoichiometric amounts (for example, 0.2 equivalents of Na 2 S 2 O 8 ) using Rh-modified TiO 2 nanoparticles as a photocatalyst, in which H 2 release is an important driving force for the reaction. Our findings not only provide an approach to accessing valuable decarboxylative C–H trifluoromethylations via activation of abundant but inert trifluoroacetic acid towards oxidative decarboxylation and trifluoromethyl radical formation, but also demonstrate that a photo-driven catalytic process is a promising way to achieve external oxidant-free C–H functionalization reactions.
研究领域:
有机化学
·
催化
·
光化学
✓ 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）