INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Hui Wang,Yawen Yang,Zeyang Li,Xiaohao Kong,Philip Martin,Guoqing Cui,Ruixue Wang
Dry reforming of methane (DRM) reaction can convert primary greenhouse gases (CH 4 and CO 2 ) to value-added chemicals (H 2 and CO), but generally suffers from harsh reaction conditions (>700 °C) and inevitable deactivation of catalysts. In this work, we report supported Ni catalysts based on a topotactic transformation process from the layered double hydroxides (NiZnAl−LDHs) precursors. Structural characterizations (XRD, HRTEM , CO chemisorption) verify a uniform distribution of Ni nanoparticles (∼7 nm) on the mixed metal oxides support with a high dispersion (denoted as Ni/MMO). With the assistance of non-thermal plasma (NTP), the optimal sample (Ni/MMO−S2) exhibits a good catalytic conversion of CH 4 (∼69%) and CO 2 (∼54%) at low temperatures (30–60 °C), which is comparable with the activity of thermocatalytic process at ∼650 °C without NTP. The energy efficiency of NTP-assisted catalysis process is an order of magnitude higher than that of thermocatalytic process at ∼650 °C and enhances by 80% relative to NTP-alone process at low temperatures. The Ni/MMO−S2 catalyst shows satisfactory stability after 600 min stability test, with a slight decrease in conversion (within ∼1%). In addition, a combined study including catalytic evaluations, operando OES, XAFS and XPS verifies that metallic Ni species acts as active center, which can promote the dissociation of CH 4 and CO 2 into highly reactive intermediate species with the assistance of NTP. This synergistic effect between plasma and Ni catalyst remarkably decreases the apparent activation energy by ∼50%, accounting for the high catalytic performance at low temperatures. This work demonstrates a promising synergistic catalysis strategy between plasma and catalysts at low temperatures, which can be extended to other reactions operated under harsh conditions.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Naijian Ge,Donghui Wang,Feng Peng,Jinhua Li,Yuqin Qiao,Xuanyong Liu
Drug-eluting stents (DESs) are widely used in the palliative treatment of many kinds of cancers. However, the covered polymers used in DESs are usually associated with stent migration and acute cholecystitis. Therefore, developing noncovered drug-loading layers on metal stents is of great importance. In this work, Ni–Ti layered double hydroxide (Ni–Ti LDH) films were prepared on the surface of nitinol via hydrothermal treatment, and the LDH films were further modified by poly(styrenesulfonate) (PSS). The anticancer drug doxorubicin could be effectively loaded onto the modified films, and drug release could be smartly controlled by the pH. Besides, the drug absorption amounts of cancer cells cultured on the films could be effectively improved. These results indicate that the PSS-modified LDH film may become a promising drug-loading platform that can be used in the design of DESs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zongze Lv,Jiaqi Ruan,Weifeng Tu,Xun Hu,Donglin He,Xin Huang,Changlei Qin
Integrated carbon capture and utilization by methanation (ICCU-methanation) is an emerging concept in reducing CO 2 emissions and storing H 2 simultaneously. One key of the technology is the development of dual functional materials (DFMs) that can efficiently capture CO 2 and then catalyze it. Herein, we propose the construction of DFM using Li 4 SiO 4 with superior CO 2 adsorption/desorption features as sorbent and catalyst carrier, CeO 2 as catalyst promoter and isolator, and Ni as catalytic metal, and comprehensively evaluate its characteristics and performance in ICCU-methanation. Results show that the DFM developed possess a high and stable CO 2 capacity of 5.4 mmol·g DFM -1 , 96 % CO 2 conversion and 96 % CH 4 selectivity under both the ideal CO 2 capturing atmosphere and the realistic flue gas containing 10 vol% steam and 8 vol% O 2 . Moreover, rapid CO 2 dissociation from the DFM is observed at a temperature lower to 560 °C due to the reaction of H* dissociated by catalyst with carbonate to form formate, which further decomposes to release CO.
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ADVANCED POWDER TECHNOLOGY
·
2017
·
IF 2.659
Meifeng Hao,Mingshu Xiao,Yuhua Yan,Yuqing Miao
The ability to manipulate the morphology and structure of core-shell materials on a micro/nano scale can further control their physical and chemical properties, leading to the wider applications. Herein, the conventional electroless deposition technique for metal alloy films on solid substrates was adapted to synthesize the Ni-P micro/nano-composites in solution under high temperature and high pressure through the hydrothermal method. The obtained amorphous Ni-P composites exhibit perfect roundness with the multilayer structure of concentric circle. By controlling the erosion condition in HNO 3 , the special embryo-like structure was obtained where a solid microsphere is encircled by a layer of hollow globular ultrathin film with the thickness smaller than 50 nm. A round hole opens on the surface of the embryo-like structure. The reaction or formation mechanism was tentatively discussed. The methods can be used to produce the special micro-/nano-structures of metal phosphide.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 4
·1-8
·
IF 2.278
Wu Yonghui,Chang Guanxiao,Zhao Yanbao,Zhang Yu
Hierarchical Fe 3 O 4 @Ni
x
SiO
y
microspheres (MSs) are synthesized via a facile hydrothermal method, using Fe 3 O 4 @SiO 2 MSs as template. The prepared Fe 3 O 4 cores present spherical shape and have a mean diameter of 500 nm, and the Ni
x
SiO
y
shell with thickness of 50 nm was composed of a large number of sheets. The Fe 3 O 4 @Ni
x
SiO
y
MSs are easily manipulated by an external magnetic force. By taking advantages of the high affinity of Ni 2+ on the shell surface toward histidine-tagged (His-tagged) proteins, the Fe 3 O 4 @Ni
x
SiO
y
MSs can be applied to enrich and magnetically separate His-tagged proteins directly from the mixture of lysed cells. Research results indicated that the Fe 3 O 4 @Ni
x
SiO
y
MSs presented negligible nonspecific protein adsorption and high protein binding ability. These MSs with a high binding capacity of 14.6 mmol g −1 are much higher than that of commercial microbeads at only 10–12 mg g −1 . Their specificity and affinity toward His-tagged proteins can be remained after four times recycling. The obtained Fe 3 O 4 @Ni
x
SiO
y
MSs are especially suitable for rapid purification of His-tagged proteins.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yanchen Liu,Jiayi Huang,Xiaoqing Zhang,Junwei Wu,Andrew Baker,Huayu Zhang,Song Chang,Xinhe Zhang
SiO(silicon monoxide) anode have received widespread attention owing to the great potential for the development of modern society. Although SiO has a large Li capacity, the short cycle life, poor rate capability and low coulombic efficiency limits its wide applications. In this paper, we adopt hydrothermal mixing and sintering process to form a ball milling bm-SiO based, Ni doped and rGO recombined composite (bm-SiO/Ni/rGO) anode material , which shows excellent cycle performance with the initial columbic efficiency of 65%, the discharge capacity of 720 mAh g −1 at 100 mA g −1 current density after 100 cycles and good rate performance. The improvement of electrochemical performance can be ascribed to the interaction effects of the limited damage of volume change, the open structure of reduced graphene oxide, and the cycle stability with the Ni doping.
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Small
·
2022
·Vol. 18
·期 21
·2200436
·
IF 15.153
Fengling Zhou,Chenghua Sun
The fuel cell is a basic device to generate electricity from chemical fuels. It is often operated with oxygen as the oxidizing agent, but its sluggish reduction has become a key challenge. Herein, a conceptual oxygen-free design is demonstrated, namely a zinc-nitrate fuel cell, which converts nitrate waste into valuable ammonia and generates electricity simultaneously. The cell is constructed with zinc foil as the anode and ruthenium (Ru) nanoparticles loaded on nickel foam as the cathode. Catalyzed by Ru/Ni hydroxide hybrid, the reaction rate of 384 mmol h –1 mg Ru –1 (1.4 × 10 –6 ± 0.1 × 10 –6 mol s –1 cm –2 ) and Faradic efficiency (FE NH3 = 97% ± 2%) at −0.6 V versus reverse hydrogen electrode are achieved for nitrate-to-ammonia conversion. During ammonia production, such zinc-nitrate fuel cell can further deliver a maximum power density of 51.5 mW cm –2 (0.25 cm 2 electrode) and 23.3 mW cm –2 (1 cm 2 electrode), keeping ultrahigh Faradic efficiency (97% ± 4% at 40 mA cm –2 ) after long tests.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·504
·
IF 2.8
Zheng Xiuxin,Gong Lin,Zou Zhengguang,Xie Zhuojia
In this paper, La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) were fabricated via the sol–gel (S-G) approach. The samples are all rhombohedral structure shapes and belong to the trigonal space group R-3c, as shown by XRD. ZEISS Gemini SEM 300 scans showed irregular sub-micron particles with decreasing particle size for La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni). The magnetic properties were characterized utilizing an MPMS, and the magnetocaloric effects (MCE) were further investigated. The investigations of La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) found that their Curie temperatures (Tc) were 289.5 K, 290.2 K, and 300 K, respectively. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) for La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Fe, Co and Ni) at 5 T is 5.107 J/(kg∙K), 4.177 J/(kg∙K) and 3.852 J/(kg∙K), and the relative cooling power ( RCP ) is 264.819 J/kg, 275.3409 J/kg and 288.7435 J/kg. The Arrott curve, normalization and Curie–Weiss law (CW) fit together to determine that the second-order ferromagnetic-to-paramagnetic (FM-to-PM) transition is observed in the three samples, along with a small magnetic hysteresis and thermal hysteresis, the super-exchange interactions (SE) and the double-exchange interactions (DE) competed with each other to increase half peak width and RCP , with La 0.7 Sr 0.15 Ca 0.15 Mn 0.95 A 0.05 O 3 (A = Ni) having the largest RCP . While conventional low-temperature magnetic materials need to work in a liquid helium environment, room-temperature magnetic materials do not need to rely on extreme cooling conditions, which greatly reduces the cost of refrigeration equipment, and thus room-temperature magnetically cooled materials have a greater potential for research and development. In this paper, Ni is used as the doping element, and its RCP can reach 288.7435 J/kg, and its Tc is close to room temperature, so it is possible to be used as a room-temperature magnetic cooling material.
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BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Zhuo Wang,Bingshuo Li,Giuseppe Pipitone,Tianhua Yang,Jian Wang,Rundong Li
A significant amount of solid residue (SR) and aqueous phase (AP) by-products are typically generated during the hydrothermal liquefaction (HTL) of lignocellulosic biomass. AP often contains substantial quantities of harmful organic matter, which can cause environmental pollution if not adequately treated. Conversely, SR can be utilized as a low-grade solid fuel. Realizing the high-value utilization of this type of by-product not only contributes to mitigating environmental pollution but also improves the overall efficiency of biomass conversion and utilization. The objective of this paper is to valorize AP and SR to produce H 2 . SR obtained from the HTL of corn stalks was converted into activated biochar (AC) to prepare a Ni/AC catalyst for H 2 production from AP through aqueous phase reforming (APR). Through CO 2 activation, the specific surface area of AC reached 691 m 2 /g at an activation temperature of 900 °C and a residence time of 3 h. Using 6 wt% Ni/AC (1/60 g catalyst /mL AP ), H 2 yield reached 17.12 μmol/COD at 320 °C over 3 h, approximately 6-fold of the non-catalyzed reaction, while the COD removal reached approximately 38 %. In the gaseous product, the composition of H 2 , CO, CH 4 , CO 2 was 31.69, 1.51, 0.67 and 66.13 vol%, respectively. In view of the adverse effect of the high COD value of AP on APR, reducing ketones, acetylenes and esters may improve the hydrogen production efficiency of the reaction system. Valorization of SR and AP for H 2 production contributes to enhancing the overall energy conversion of biomass HTL.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Zhao Rongxiang,Wang Hongli,Li Xiuping
The introduction of oxygen vacancies on the surface of catalysts is an important way to improve the performance of catalysis for oxidative desulfurization. In this study, Ni-doped CoMoO 4 catalysts with a significant number of oxygen vacancies were synthesized using hydrothermal methods. The structure of the catalysts was characterized through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption techniques, and UV–visible diffuse reflectance (UV–Vis DRS). Compared to CoMoO 4 , the specific surface area of Ni-CoMoO 4 decreased, but the performance of catalysis is improved due to the increased number of oxygen vacancies. The oxidative desulfurization experiments showed that catalytic activity was significantly enhanced by Ni doping. The optimum reaction conditions were determined to be a Ni/Co molar ratio of 1:20, a reaction temperature of 110 °C, a catalyst dose of 0.05 g, and an oxygen flow rate of 150 mL/min. The desulfurization rate of dibenzothiophene (DBT) in model oil could be as high as 96% under the optimum reaction conditions. The desulfurization mechanism of the catalyst was investigated by free radical-trapped experiments. This study proposes a novel strategy for oxidative desulfurization using metal-doped compounds with abundant oxygen vacancies as catalysts. Graphical abstract An inorganic material Ni-CoMoO 4 with a number of oxygen vacancies was synthesized by hydrothermal method and applied for removal of sulfur-containing compounds. It is necessary for ecological and environmental demands. This work provides a new idea for oxidative desulfurization using metal-doping compound containing a number of oxygen vacancies as catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Changtu Ma,Bing Dai,Yanxia Wu,Ying Liu,Lin Jing,Caili Zhang,Huayun Du
In-situ grown graphene nanosheets reinforced nickel-based composites (graphene/Ni composites) always suffer from the trade-off between strength and ductility due to the poor mechanical compatibility and interfacial bonding of reinforcement/matrix components. Microalloying has been established to be an effective strategy in strengthening the graphene/Ni composites; however, the influences of alloying elements on the microstructures and mechanical properties of the composite still remain unclear. This study introduces the Cu element into the Ni matrix for achieving a co-reinforcing effect with the well-dispersed in-situ graphene nanosheets. The experimental investigations and first-principles calculation reveal that a proper concentration of Cu dopant not only improves the bonding strength of the graphene/Ni interface by a good wettability, but also causes an abnormal grain growth in the Ni matrix and thus generates a bimodal structure. Consequently, the in-situ synthesized graphene/Ni composite with 1.5 wt.% Cu exhibits the optimal strength-ductility synergy with a high yield strength, ultimate tensile strength, and fracture elongation of 276 MPa, 575 MPa, and 49.9%, respectively. Compared to the undoped composite, the enhancements in these mechanical parameters reach 32.1%, 21.6%, and 28.9%, respectively. Despite the common strengthening mechanisms, such as the effective load transfer, dislocation strengthening, twin boundary strengthening, solid-solution strengthening, and Orwan strengthening, are contribute to the tensile strength of Cu microalloying graphene/Ni composites, it is determined that the hetero-deformation-induced hardening is playing a critical role. At the same time, the bimodal structure also delays the necking and further suppresses the crack propagation in the Ni matrix, enabling exceptional plasticity.
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ACS Nano
·
2025
·
IF 16
Feng Li,Xin Zhang,Kaixin Zhang,Maosheng Gong,Zezhou Lin,Peiyu Hou,Jingyuan Liu,Haijing Liu,Hongzhou Zhang,Xijin Xu,Haitao Huang
The synergistic effects of a single-crystal structure and high-entropy doping are expected to enhance the structural and thermal stability of high-capacity Ni-rich cathodes. Nonetheless, the pinning effect caused by heavy-mass dopants and surface phase segregation induced by the thermodynamic immiscibility of dissimilar elements hinder atomic diffusion and crystal fusion, making it extremely difficult to synthesize single crystals with high-entropy doping. In this study, density functional theory calculations confirm that effective diffusion is achievable within a grain-boundary-free single-crystal matrix at elevated temperatures, even for heavy-mass dopants with high valence states. A lattice-matched epitaxial growth approach is proposed to enable the synthesis of single-crystal Ni-rich oxides with high-entropy doping. The synergistic effects of high-entropy doping and single crystals within a Ni-rich cathode exhibit significantly reduced changes in the lattice volume and Ni–O/TM coordination distance and the absence of intragranular cracks upon Li+ de/intercalation, presenting highly improved cyclic and thermal stabilities compared with the high-entropy-doped polycrystal counterpart and single-crystal counterpart without high-entropy doping. This integration not only addresses the inherent limitations of Ni-rich compositions but can also be expanded to the design of other electrode materials, where entropy-driven stabilization and single crystals can work together to enhance cathode performance.
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