APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xiaobin Dong,Han Wang,Xiaolong Li,Pedram Fatehi,Shoujuan Wang,Qin Wu,Keyin Liu,Fangong Kong
Graphitic carbon nitride is a very potential photocatalytic catalyst for H 2 production, but its practical application is seriously limited by the fast recombination of photogenerated carriers and insufficient utilization of surface charge. In order to solve these problems, herein, a series of g-C 3 N 4 -NiO-NiS x photocatalysts were synthesized by first calcining the precursor to load NiO on g-C 3 N 4 and subsequently partial sulfidation of NiO into NiS x in situ via a hydrothermal process. Under the irradiation of visible light, the photocatalytic H 2 production rate of g-C 3 N 4 -NiO-0.4T can be up to 1248.1 μmol·g −1 ·h −1 using triethanolamine as sacrificial agent. In addition, recycling test also confirmed g-C 3 N 4 -NiO-0.4T has excellent photostability. It is believed that the formation of p-n junction between NiO and g-C 3 N 4 and the presence of NiS x promote the spatially fast separation of photogenerated carriers, while the abundant interface of NiS 2 and NiS also leads to the good proton trapping ability. These two factors jointly determine the efficient H 2 production of the composite photocatalysts. Furthermore, the detailed energy band structure and plausible photocatalytic mechanism of g-C 3 N 4 -NiO-NiS x are also proposed. This work can offer a new route and useful reference for the design and research of high efficiency composite photocatalysts for H 2 production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Meng-yuan Ding,Juan Wang
Photocatalytic hydrogen production is of great significance for the transformation of energy system . To improve the hydrogen production performance, nano-photocatalysts including pure TiO 2 and NiO-TiO 2 were prepared by sol-gel method in this paper. To unravel reaction intermediates and pathways, the adsorption experiments and photocatalytic reaction of ethanol over the photocatalysts were carried out in combination with in situ DRIFTS technique, and the main products in the photocatalytic process were detected through gas chromatography . The results showed that 2NiO-TiO 2 as the optimum photocatalyst can yield the maximum H 2 rate at 20.10 mmol g −1 h −1 . For the adsorption of ethanol on TiO 2 and 2NiO-TiO 2 , the molecular form of ethanol is more dominant than the dissociated form, and CH 3 CH 2 OTi is more easily generated on 2NiO-TiO 2 than pure TiO 2 . The hydrogen production pathway changes by doping with NiO, reducing the production of acetic acid and aldehydes and producing the important intermediate CH 2 CHOTi.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Hui Zhang,Xingyou Tian,Cuiping Wang,Hailong Luo,Jie Hu,Yuhua Shen,Anjian Xie
Reduced graphene oxide/NiO composite (RGO/NiO) was synthesized by a facile pyrolyzation process. The NiO nanoparticles with a small size of about 10–50 nm are uniformly dispersed onto the thin graphene nanosheets . The as-prepared RGO/NiO composite shows excellent microwave absorbability. The obtained composite with a coating layer thickness of 3.5 mm exhibits a maximum absorption of −55.5 dB at 10.6 GHz. And in particular, the product with a coating layer thickness of only 3.0 mm possesses a bandwidth of 6.7 GHz (from frequency of 10.2 to 16.9 GHz) corresponding to reflection loss at −10 dB (90% absorption). Thus, the as-prepared RGO/NiO composite is a very promising EM wave absorbing material as lightweight and high-performance.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Haibin Sun,Xue Guo,Jiao Li,Guochang Li,Zanzhong Yang,Hao Ding,Weilu Yan,Shuai Qi,Peng Wang,Youjie Song
In order to clarify the effect of grain size on the electrical performance of BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) solid electrolytes with addition of NiO, microcrystalline (~1.5 µm) and ultrafine-grained (~280 nm) BZCYYb electrolytes (with 1 wt% NiO) were fabricated by the conventional and two-step sintering method, respectively. The results show that compared with microcrystalline electrolytes, the ultrafine-grained electrolytes have similar grain-interior conductivities, but much lower grain-boundary conductivities, illustrating that the grain boundary is not conducive for ionic transport. As a result, the electrical conductivity of microcrystalline electrolytes (1.9 × 10 −2 S cm −1 at 600 °C in wet air) is higher than that of ultrafine-grained electrolytes (1.1 × 10 −2 S cm −1 at 600 °C in wet air). In addition, the OCV (open-circuit voltage) values of electrolyte-supported single cells show that the undesired electronic conduction exists in the electrolytes due to the BaY 2 NiO 5 impurity formed by the reaction of NiO and BZCYYb. The ultrafine-grained electrolytes show lower OCV values than that of microcrystalline ones, due to the prolonged electronic transport paths. Therefore, large-grained or grain boundary-free microstructure are necessary for improving the electrical performance of BZCYYb electrolytes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 11
·944
·
IF 3.444
Jun Zhou,Yue Zhang,Song Li,Jing Chen
Heterogeneous catalysis often involves charge transfer between adsorbed molecules and the surface of catalyst, and thus their activity depends on the surface charge density. The efficiency of charge transfer could be optimized by adjusting the concentration of oxygen vacancies (Ov). In this work, hexagonal Ni(OH)2nanoparticles were initially synthesized by a hydrothermal process using aluminum powder as the sacrificial agent, and were then converted into 2D Ni/NiO nanocomposites through in situ reduction in hydrogen flow. The oxygen vacancy concentration in the NiO nanosheet could be well-controlled by adjusting the reduction temperature. This resulted in strikingly high activities for hydrogenation of nitrophenol. The Ni/NiO nanocomposite could easily be recovered by a magnetic field for reuse. The present finding is beneficial for producing better hydrogenation catalysts and paves the way for the design of highly efficient catalysts.Keywords:metal-oxide interaction;oxygen vacancy;hydrogenation;catalyst
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
CHEMICAL ENGINEERING SCIENCE
·
2016
·
IF 2.75
Yi Li,Muhammad Nadeem Amin,Xingmei Lu,Chunshan Li,Fuqiang Ren,Suojiang Zhang
The catalyst NiO/MgO–Al 2 O 3 was prepared by loading magnesium and nickel onto the surface of γ-Al 2 O 3 beads, respectively, and was adapted to in situ upgrade the high temperature pyrolysis vapor derived from coal pyrolysis. The catalyst synthesis process, and structural variation were characterized by the XRD, SEM, and physical adsorption analyzer. In order to examine the catalytic effect on the different nickel loading ratio in the catalysts, the solid–liquid–gas product distribution, variation of gas and components of coal tar were studied by simulated distillation, GC/MS, elemental analysis and so on. The results shows both the tar yield and the content of the light fraction in the tar can be increased by catalytic up grade. The catalyst has a strong ability to convert the heavy component and polycyclic aromatic hydrocarbons in the tar to lower molecular weight components.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Ting-ting Yu,Xian-Fa Zhang,Ying-Ming Xu,Xiao-Li Cheng,Shan Gao,Hui Zhao,Li-Hua Huo
CdO-decorated hierarchically mesoporous NiO nanofilm with wrinkle structure was grown in-situ on ceramic tubes via a simple hydrothermal reaction without any surfactant or template. The as-prepared nanofilm was characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and Brunauer–Emmett–Teller (BET) analyzes. It exhibits a nanoparticulate film with uniformly self-assembled wrinkles. These wrinkles are thin porous nanosheets that are further constructed by subnanometer nanoparticles . Compared with the NiO porous nanowall arrays, the 2.01 mol% CdO-decorated NiO film exhibits not only higher response to part per billion (ppb) levels (0.5–100 ppb) H 2 S at low temperature (92 °C), but also higher selectivity to other reducing gases compared with pure NiO porous nanowall arrays. The lowest detection limit of the NiO film after CdO decoration decreases down to 0.5 ppb while that of pure NiO is 1 ppb. The mechanism of the enhanced H 2 S sensing for 2.01 mol% Cd-decorated NiO film is also discussed in detail.
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yubao Li,Hanke Li,Shuang Li,Ming Li,Ping He,Yao Xiao,Jiufu Chen,Yafen Zhou,Tongyan Ren
Photocatalytic water splitting for hydrogen evolution is viewed as a promising strategy to address the energy and environmental issues. In this study, a series of NiO/Zn 3 In 2 S 6 (NiO/ZIS 6 ) p-n heterojunction photocatalysts have been prepared by the facile ultrasonic assisted deposition method. The as-obtained samples were systematically characterized employing various testing techniques. The photocatalytic performance of the p-n photocatalysts were evaluated by photocatalytic hydrogen production and the effect of different mass ratios of NiO to ZIS 6 on photocatalytic hydrogen evolution performance was also explored. The results indicated that the 25% NiO/ZIS 6 sample demonstrates optimal photocatalytic hydrogen evolution activity with a hydrogen evoluton rate of 21.79 mmol g −1 h −1 , which is 7.65 times higher than that of ZIS 6 . The mechanism exploration proves that the formation of NiO/ZIS 6 p-n heterojunction effectively promotes the separation and migration of photoinduced electrons and holes. Meanwhile, the recombination of charge carriers was restrained observably. This work may shed light on the design and preparation of novel p-n heterojunction photocatalysts with efficient photocatalytic hydrogen evolution performance and high stability.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yubiao Li,Yu Liu,Xueqian Wang,Yixing Ma,Ping Ning,Langlang Wang,Xiang Li,Rui Cao
Activated alumina-based composite oxide support is a commonly used support in hydrodesulfurization (HDS) catalysts, which not only retains the performance advantages of each component in the composite oxide support, but also significantly improves the defects of a single activated alumina support, such as the strong metal-support force of interaction. In this study, NiO-Al 2 O 3 composite support was prepared by introducing NiO-modified Al 2 O 3 , and MoS 2 /NiO-Al 2 O 3 catalysts were prepared for the hydrodesulfurization of COS by liquid phase reduction method. In the COS hydrogenation reaction, the MoS 2 /NiO-Al 2 O 3 catalyst achieved complete conversion of COS at 220 °C and showed more than 99.9% H 2 S selectivity. In stability tests, the catalyst maintained a COS conversion of over 99% throughout the 23-h hydrogenation reaction. Various characterization results show that the NiO-Al 2 O 3 composite support prepared by introducing NiO-modified Al 2 O 3 weakens the metal-support interaction force between MoS 2 and NiO-Al 2 O 3 composite support, which is conducive to the synthesis of MoS 2 with multilayer and long wafer structures. And it can significantly increase the formation rate of MoS 2 to 87.9%, which greatly improves the active site content of the catalyst. Furthermore, the dual modulation of MoS 2 and Al 2 O 3 by NiO modulated the surface alkalinity of the catalysts and promoted the formation of a large number of active edge sites in the MoS 2 /NiO-Al 2 O 3 catalysts, which in turn significantly improved the HDS performance of the catalysts. In addition, EPR characterization combined with experiments showed that the sulfur vacancies are the active sites for catalytic COS hydrodesulfurization over MoS 2 -based catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xueying Zhao,Wenyu Xie,Zhibo Deng,Gan Wang,Aihui Cao,Huamei Chen,Bo Yang,Zhuan Wang,Xintai Su,Chao Yang
NiO-TiO 2-x /C composites for photo-catalytic hydrogen production have been prepared by a molten salt template-assisted pyrolysis of Ni/Ti-oleylamine precursors at different temperatures. X-ray diffraction (XRD) analysis shows that it is brookite structure, and X-ray photoelectron spectrum (XPS) determines the chemical state of the elements. Carbon nanosheets improve the dispersion and stability of TiO 2 , making the later fully close to each other. NiO facilitates the separation of photo-generated carriers and enhances the photocatalytic hydrogen production activity of TiO 2 . Due to the efficient synergy of carbon nanosheets, NiO, and TiO 2 , the optimized (1 wt%)NiO-TiO 2-x /C-T650 nanocomposites show enhanced activity toward photocatalytic hydrogen production from water, outperforming 18-fold in activity higher than pristine TiO 2 /C. Moreover, the (1 wt%)NiO-TiO 2-x /C-T650 catalyst exhibits good stability without obvious decrease in activity under continuous cycling. This work will lead to the optimization of carbon-supported multi-component catalysts for photocatalytic hydrogen production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 6
·e17664
·
IF 4.167
Yuan Shu,Mengyao Wang,Xiaolan Duan,Dandan Liu,Shize Yang,Pengfei Zhang
Designing methane combustion catalysts operated under low temperature (<400°C) remains a huge challenge, especially for noble-metal–free catalytic systems. With NaCl as a crystalline scaffold, NiO catalyst with abundant oxygen vacancies and an ultra-high–specific surface area of 181 m 2 g −1 is obtained. The mesoporous NiO exhibits outstanding CH 4 combustion performance ( T 90 = 370°C at the weight hourly space velocity (WHSV) = 20,000 mL g −1 h −1 ). X-ray photoelectron spectroscopy (XPS), H 2 -temperature-programmed reduction (TPR), kinetic measurements, and O 18 isotope-labeling experiments together disclose the key role of surface lattice oxygen and reaction mechanism by NiO catalysts. More importantly, the excellent stability of NiO by doping La was obtained (low-temperature thermal stability: 385°C, 400 h, 4 vol% H 2 O).
研究领域:
催化化学
·
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
F.F. Alharbi,Salma Aman,Muhammad Abdullah,Abdul Ghafoor Abid,Sumaira Manzoor,Rabia Yasmin Khosa,Hafiz Muhammad Tahir Farid,Maksim V. Silibin,S.V. Trukhanov,T.I. Zubar,A.V. Trukhanov
Developing heterostructure electrocatalysts is a possible route to discovering cost-effective and effectual catalysts for the oxygen evolution reaction. Er 2 O 3 –NiO nanoparticles have been created by successive drop cost method on nickel form. The produced Er 2 O 3 , NiO, and Er 2 O 3 –NiO electrocatalytic performances have been assessed, showing increased OER (185 mV@10 mA/cm 2 ) activities compared to the single component. Furthermore, the three-electrode system (Er 2 O 3 –NiO) has remarkable OER properties, requiring only 1.37 V to reach 10 mA/cm 2 . Er 2 O 3 –NiO ‘s synergistic effect, which helps to cause lattice change into the fine structure of the crystal, activates the evolution of surface partial oxygen atoms and enables the lattice oxygen process, is principally responsible for its excellent catalytic performance and stability. This research contributes to a more profound knowledge of the synergistic interaction between various material oxides in heterostructure catalysts. It offers recommendations for future research and development of nanomaterials in sustainable energy conversion technologies.
研究领域:
材料科学
·
催化化学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）