JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Cheng Lv,Jiayan Huang,Yuang QI,Qingjie He,Yazhou Wang,Cuili Xiang,Yongjin Zou,Fen Xu,Lixian Sun
MgH₂ is one of the most promising materials for solid hydrogen storage and is environmentally friendly primarily owing to its high mass hydrogen storage density (7.6 %). However, the application and development of MgH₂ are limited by its sluggish kinetics, requiring high processing temperatures. In this study, we prepared Ni/Co-co-doped Ti 2 VC 2 bimetallic MXene nanosheets via etching and the hydrothermal method. These nanosheets were then doped into MgH₂, resulting in drastically improved hydrogen storage properties. The MgH₂-based composite hydrogen storage materials doped with 10 wt% Ni/Co–Ti 2 VC₂ (TVCNC) commenced hydrogen emission from 183 °C and could emit 6.65 wt% hydrogen at 300 °C. During the rehydrogenation test, the composites could still absorb hydrogen at 5.0 wt% within a 10 min window at a hydrogen pressure of 20 bar at 125 °C. Moreover, the hydrogen absorption and emission kinetics of the doped MgH₂ were considerably improved. This improvement could be ascribed to the significantly increased specific surface area of the MXene nanosheets after etching, which increased the number of active sites on the surface to accelerate the reaction, thereby accelerating hydrogen adsorption and emission. In addition, the migration of electrons between the multivalent Ti ions as well as between Ni and Co helped accelerate bond cleavage between magnesium and hydrogen, thereby enhancing the kinetic properties. Ni/Co co-doping produced Mg 2 Ni alloys with magnesium via hydrogen adsorption and emission, thus improving the reaction kinetics of the composites.
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高影响因子
AICHE JOURNAL
·
2025
·
IF 4
Hong-Da Zhang,Wei-Yao Yang,Miao Pang,Ya-Qiao Tian,Shi-Chao Su,Zhi-Ping Zhao,Le Sang
Non-modified Pd/PDA/Ni foam, hydrophobic modified F 9 -Pd/PDA/Ni foam, and F 17 -Pd/PDA/Ni foam catalysts are successfully prepared and used for NB hydrogenation in micropacked bed reactors (μPBRs). The catalytic performance increases with the addition of water in the water–methanol mixed solvent. In the mixed solvent with 50 v/v% water, F 17 -Pd/PDA/Ni foam can almost completely convert nitrobenzene (NB) with a yield of 95.9% at a mild 45°C. As the solvent contact angle of catalysts increases (87.5–141.5°), the enhancement ratios of NB conversion and AN yield are 28.9%–92.4% and 31.4%–106.5%, respectively. The space–time yield of AN in μPBRs reaches 1.873 kg·L −1 ·h −1 ·g −1 , which is 1–2 orders of magnitude higher than that of conventional reactors. The kinetic model of NB hydrogenation is established at the water–methanol system in μPBRs. The hydrophobicity of catalysts significantly improves the reaction rate of NB hydrogenation, and the reaction rate constant is increased by 69.9%.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xuan Chen,Zheng Chen,Lang Wu,Feifei Hu,Xin Zhou,Qian Lin,Hongyan Pan,Yongyong Shi,Donghai Jiang
Using an l-arginine (LA)-functionalized Pd–Ni catalyst, hydrogen peroxide (H2O2) was directly synthesized via a self-designed microreactor at ambient temperature and pressure. The yield of H2O2 achieved 574.31g kgcat–1 h–1, with the concentration of H2O2 in the solution reaching 4.05 wt % per hour. After five cycles and online activation, the LA functionalized Pd–Ni catalyst maintained high H2O2 catalytic activity. The catalytic activity evaluation experiments, characterization results, and simulation studies demonstrated that Ni doping and LA-functionalization synergistically modulate the electronic structure of the active Pd component. This modulation increases the concentration of Pd2+ at the active sites, effectively inhibits the dissociation of the O–O bond in O2*, OOH*, and HOOH* species, thereby enhancing the catalytic performance for H2O2 production. This study proposes a systematic strategy for the design of Pd-based catalysts to directly synthesize highly efficient H2O2.
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PubMed
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
T. Huang,X. Huang,C. Hu,J. Wang,H. Liu,Z. Ma,J. Zou,W. Ding
In this work, one-dimensional NiMoO 4 and CoMoO 4 nanorods are prepared and introduced into MgH 2 to improve its hydrogen storage properties. It is observed that the MgH 2 –NiMoO 4 system exhibits lower dehydrogenation temperature and faster kinetics than the MgH 2 –CoMoO 4 system and pure MgH 2 , indicating the superior promoting effect of NiMoO 4 over CoMoO 4 . Concretely, NiMoO 4 reacts with MgH 2 during the first dehydrogenation to in situ form Mg 2 Ni and Mo 0 , both of which are crucial factors for the following hydrogen cycling process. The ‘Mg 2 Ni/Mg 2 NiH 4 ’ mutual transformation upon hydrogen release/uptake is the well-known ‘hydrogen pump’ effect which boosts the hydrogen storage performance of MgH 2 . Moreover, theoretical calculations reveal the dual roles of Mo 0 played for the hydrogen storage in MgH 2 : i) it accelerates the hydrogen de/absorption of MgH 2 through weakening the Mg–H bonding; ii) it facilitates the mutual ‘Mg 2 Ni/Mg 2 NiH 4 ’ transformation as the formation energy of Mg 2 NiH 4 decreases under the influence of Mo 0 , which we call ‘facilitated hydrogen pump’ effect in this work. Ascribing to the collaborative action between Ni- and Mo- containing species, the hydrogen storage kinetics of MgH 2 has been accelerated.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Lianbo Wang,Yuantao Zhao,Chuanhai Jiang,Vincent Ji,Ming Chen,Ke Zhan,Florent Moreira
Ternary Ni-Ti-CeO 2 composite coatings were synthesized from Watts bath containing various concentrations of mixed particles including Ti microparticles and CeO 2 nanoparticles (fixed ration 10: 1 by weight) by electrodeposition . Microstructures of the composite coatings were comprehensively investigated by XRD , SEM, AFM and TEM . The incorporation of mixed particles gave birth to grain refinement, attenuation of soft mode [200] texture and random-orientated grain growth of nickel deposits . Typically, as for the composite coating electrodeposited form Watts bath containing relatively low concentrations (less than 22 g/L) of mixed particles, the presence of pores inside the coatings, asperities on the surface and cluster-like distribution of Ti microparticles in composite coating, restricted the improvement of properties. By increasing concentration of mixed particles to 88 g/L, high-quality Ni-Ti-CeO 2 composite coating with uniformly distributed Ti microparticles was achieved. The incorporation of Ti microparticles should take great responsibility for the presence of pores and asperities, while the incorporation CeO 2 nanoparticles played very important role in the formation of dense and smooth composite coatings. Microhardness and wear resistance were also improved by increasing contents of mixed particles in composite coatings. The incorporation of mixed particles leaded to increasement of friction coefficient and the friction coefficient presented increasing tendency by increasing the concentrations of mixed particles in Watts bath.
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高影响因子
Journal of Physical Chemistry C
·
2015
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IF 4.772
Li Feng,Hanbao Chong,Peng Li,Ji Xiang,Fangyu Fu,Sha Yang,Hui Yu,Hongting Sheng,Manzhou Zhu
In this work, Pd–Ni alloy nanoparticles (NPs) were produced by a facile and efficient one-pot synthetic strategy in the presence of oleylamine (OAm) and triphenylphosphine (TPP). Transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS) mapping, inductively coupled plasma atomic emission spectroscopy (ICP-AES), and X-ray diffraction (XRD) were used to investigate the structure of Pd–Ni alloy NPs, which demonstrated that the as-prepared alloy NPs possessed uniform sizes and tunable compositions. Importantly, we found that TPP could affect the morphology of the Pd–Ni alloy. When TPP was absent from the reaction, the morphology of the Pd–Ni alloy was not uniform. In addition, the as-prepared Pd–Ni alloy NPs showed conspicuous composition-dependent catalytic activities for the Miyaura–Heck reaction. In the series of the Pd–Ni alloy NPs, Pd1Ni1 has an excellent effect for the Miyaura–Heck reactions. Furthermore, the Pd–Ni alloy NPs were also effective for different substrates in the Miyaura–Heck reactions. Compared to pure palladium, the Pd–Ni alloy NPs as the catalysts show better catalytic activity, selectivity, and stability.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 44
·期 21
·10788-10799
·
IF 4.084
Hao Chen,Tiebang Zhang,Lishuai Xie,Lin Song
On the basis of modification of transition metals on Mg-Al hydrogen storage alloys , Mg15Al5Ni alloy with Ni content of 5 wt% has been prepared by high energy ball mill. The results show that Ni particles uniformly distribute on the surface of particles, while several Ni particles are embedded inside alloy particles. These Ni particles tend to redistribute after hydrogenation. The phase composition analysis reveals the formation of stable Al 3 Ni 2 phase in Ni-modified alloy after hydrogenation. The hydrogen absorption performance of Mg15Al5Ni alloy has been improved by introducing Ni, which can absorb 4.36 wt% hydrogen within 5 min at 350 °C. Meanwhile, the activation properties of Mg15Al5Ni alloy can be obviously deteriorated due to the addition of Ni. However, uniformly distributed Al 3 Ni 2 nanocrystals with grain sizes around 10 nm hinder grain growth of hydrides, ameliorating hydrogenation kinetics of Mg15Al5Ni alloy. Besides, the modified effect of Ni on hydrogenation kinetics of Mg15Al5Ni alloy has been also discussed in this work.
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高影响因子
RSC Advances
·
2023
·Vol. 13
·期 24
·16363-16368
·
IF 3.9
Han Xiao,Chao Zhang,Jiaojiao Zhao,Zhaohui Zheng,Yuehui Li
Selective hydrogenation of dimethyl terephthalate (DMT) is an ideal way to prepare 1,4-cyclohexane dicarboxylate (DMCD), an important intermediate and monomer. Even though noble metal-based catalysts (e.g., Ru, Pd) have been developed for selective hydrogenation of DMT, the use of non-precious Ni catalysts to achieve high activity and selectivity is still challenging. In this study, we present that only 0.5 wt% of KF by post-impregnated doping can significantly improve the performance of Ni/SiO2 catalysts (83% vs. 96% selectivity; 41% vs. 95% conversion). The selectivity of DMCD can be up to 97%, which is the highest reported over Ni catalysts. The boosting effect of KF modification might be due to higher amounts of Ni(0) species and lower amounts of moderate acidic sites, which are beneficial for selective hydrogenation of phenyl rings over hydrogenolysis of ester groups.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Jieting Ding,Shan Ji,Hui Wang,Vladimir Linkov,Hengjun Gai,Fusheng Liu,Quanbing Liu,Rongfang Wang
Water electrolysis offers a promising approach toward future sustainable energy mix utilizing hydrogen as energy carrier. Bifunctional catalyst which is active in both oxygen and hydrogen evolution reactions can significantly enhance total electrochemical water splitting efficiency and simplify electrolysis systems. In this study, nitrogen doped nickel-containing porous carbon networks were prepared to fulfill this role. Peptone was used as carbon and nitrogen source during the synthesis and NaCl presence as a template resulted in the formation of open mesopores interconnected by thin carbon sheets with nanosized Ni particles encapsulated in the carbon matrix. A low onset potential of 53 mV and a charge transfer resistance of 3.8 Ω with excellent cycling stability were demonstrated when the optimized catalyst Ni-2 was applied in HER. It was also shown that Ni-2 onset potential, charge transfer resistance, and durability in OER were comparable to those of a commercial RuO2 catalyst. During the electrolysis study conducted at 10 mA cm–2, Ni-2 maintained a cell voltage of 1.63 V with remarkable stability during 25 h operation.
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高影响因子
RENEWABLE ENERGY
·
2020
·
IF 6.274
Yunwu Zheng,Jida Wang,Can Liu,Yi Lu,Xu Lin,Wenbin Li,Zhifeng Zheng
To eliminate the problematic need for liquid phase, high temperature, and high pressure, as well as the excessive consumption of hydrogen and production of aromatic hydrocarbons, associated with traditional aviation oil preparation processes, Ni–Cu bimetallic catalysts were synthesized and evaluated for ex situ catalytic pyrolysis vapor upgrading of oleic acid under a N 2 atmosphere. The effects of catalyst support (AC, Al 2 O 3 , ZrO 2 , HZSM-5, HUSY, Hβ and MCM-41), pyrolysis process parameters (pyrolysis temperature, catalytic temperature and amount of oleic acid injected), and the mixing ratio of modified metals (Ni:Cu = 0:1,2,1:1,1:2,1:0) on the catalytic conversion of oleic acid to high-quality chemicals were studied. The catalysts were characterized by XRD , BET and NH 3 -TPD. Modified bimetallic catalysts show great potential for green diesel production without the use of H 2 feed. The abundance of Brønsted acid sites favors HDO routes (such as HZSM-5, HUSY, Hβ and MCM-41), while Lewis acid sites (such as ZrO 2 and Al 2 O 3 ) favor hydrogenation and decarbonylation reactions. The addition of Cu enhances the reducibility of Ni and inhibits the cracking reaction and deactivation caused by coke. The addition of Ni effectively promotes the conversion of oleic acid, accelerates the fracture of C–C and effectively improves the production of hydrocarbons. The highest conversion was 100% with 85.68% selectivity towards hydrocarbons under pyrolysis at 450 °C, a catalytic temperature of 500 °C, and a feed quantity of oleic acid of 0.25 ml/min using Ni–2Cu/MCM-41 catalysts, and the oxygen removal efficiency and selectivity of C17 hydrocarbon were the highest (85.68% and 26.77%, respectively). The main products were olefins . In addition, the regenerated catalyst had good stability and could be used for at least 3 reaction cycles without observation of significant deactivation.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Song Cheng,Yutao Liu,Xinyi Liu,Changqing Zhu,Jingyang Luo,Jiashun Cao,Fuqiang Liu
Electro-assisted activation of peroxymonosulfate (EA-PMS) by transition metals oxides (TMOs) has been extensively studied for the removal of organic pollutants. Despite TMOs possess considerable activity and affinity to PMS, their poor bulk conductivity still limits the electron exchange during the TM δ/δ+1 redox cycle, especially the efficient reduction of TM δ+1 via cathodic process. In this study, carbon felt loaded with modified Co 3 O 4 nanosheets (Co@FCF) was fabricated and applied as the flow-through electrode of EA-PMS process, where the Co 3 O 4 nanosheets were embedded with numerous metallic Ni particles encapsulated within carbon layers (Ni@C). Driven by weak electric current, continuous electrons can be supplied to the bulk Co 3 O 4 from the electron-rich Ni@C nanoparticles, resulting in accelerated Co 3+ /Co 2+ cycle, enhanced production of SO 4 ·− and improved energy utilization efficiency. Electrochemical tests along with density functional theory calculations indicate that the unique structure of Co@FCF played essential role in the enhanced performance.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jian Tian,Xuwen Zhang,Mengge Wu,Benhuan Xu,Kok Bing Tan,Bin Chen,Guowu Zhan
The conversion of stearic acid to linear hydrocarbons represents a critical step in the advancement of sustainable biofuels and biochemicals. In this work, a confined NiCo bimetallic catalyst (Nix-Co/C@TSC) was assembled on biochar derived from natural Tung shell (TS) using an in situ growth approach for the H2-free catalytic deoxygenation of fatty acids. The catalyst exhibited exceptional catalytic performance, achieving a high conversion of 98.2% and a remarkable selectivity of 82.8% for heptadecane. Multiple characterization revealed that the Tung shell-derived biochar (TSC) support significantly enhanced the spatial dispersion of Co and Ni species, promoting the formation of the NiCo alloy phase. This structural modification, combined with improved reactant adsorption capabilities, synergistically boosted the overall catalytic activity. In situ DRIFTS analysis revealed that CoOx species activate stearic acid via strong carboxyl-group adsorption, while Ni preferentially promotes the decarboxylation pathway by stabilizing key intermediates, collectively facilitating heptadecane formation. This work develops a novel dual carbon-supported bimetallic catalyst system, offering a promising strategy for the efficient conversion of stearic acid into high-value hydrocarbon products.
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高影响因子
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