JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hongwei Pan,Xin Zhang,Yubao Jia,Yao Zhang,Zhigang Jiang,Caixia Sun,Xu Li,Lei Zhu,Kuikui Wang
Electronic structure regulation is one of the essential strategies for developing advanced electrocatalysts . Herein, FeOOH was electrodeposited on the surface of NiSe 2 /Ni 2 O 3 , resulting in a layered NiSe 2 /Ni 2 O 3 /FeOOH interfacial composite with a unique hierarchical structure and strong electronic interactions. This sheet-like nanostructure provides sufficient space for mass transfer, fully exposes the active sites, and accelerates the reaction kinetics. The optimal sample exhibits excellent oxygen evolution reaction (OER) activity with a low overpotential of 270 mV at a current density of 100 mA cm −2 and a Tafel slope of only 54.7 mV dec −1 . It also has excellent durability. This study provides a new perspective for developing efficient electrocatalysts by constructing interfacial composites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2014
·
IF 3.679
Tie Jun Lin,Xuan Meng,Li Shi
A non-petroleum route to produce acrylic acid was investigated through hydrocarboxylation of acetylene with CO and water in the presence of Ni 2 O 3 and cupric bromide as combined catalysts. The activity of Ni 2 O 3 was compared with various homogeneous catalysts; the effect of initial total pressure, reaction temperature, molar ratio of CO/C 2 H 2 , the volume ratio of solvent/water, the catalyst amount and the role of promoters have been studied in detail. It was found that the acrylic acid space-time-yield as high as 764.6 mol AA/(mol Ni h) was obtained under the optimal experimental conditions. The Ni 2 O 3 catalyst could be reused at least five times without obvious loss of activity. The characterization of recovered catalysts by XRD, XPS, SEM and TG–DTG revealed that the state of nickel remains unchanged during the reaction, and there are three types of soft coke deposited on the surface of the catalyst. The catalysts can be regenerated through calcination within 400 °C according to TG curve.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jiayou Mou,Chenxi Wang,Run Pan,Guanlin Zhang,Shuai Liu,Honglei Zhang,Jing Wang,Yong Ren
The development of an efficient and economically viable photocatalyst for hydrogen evolution reaction (HER) process is of paramount importance and holds considerable significance. Currently, high-performance catalysts predominantly incorporate precious metals, thereby substantially augmenting both cost and application complexity. This study explores a simple synthesized method and constructs various heterojunction structures in the HER catalyst via incorporating Ni 2 O 3 , TiO 2 , and carbon nanotubes (CNT) to constitute the composite catalyst materials. Incorporation of Ni 2 O 3 and CNT can form the z-type heterojunction, leading to a substantial enhancement in light absorbance and electron transmission capabilities, with the hydrogen production rate of 1422 μmol/g/h, which is 11-fold increase compared to that of TiO 2 . The life cycle assessment (LCA) shows the total carbon footprint of this novel photocatalytic hydrogen technology is 81.91 kg CO 2 -eq when producing 1 kg of hydrogen. The research presents a comparatively efficient and cost-effective photocatalytic material for hydrogen generation, offering valuable insights for future endeavors in this field.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 30
·e54102
·
IF 3
Pengwei Wu,Jie Liu,Song Wang,Sanxi Li,Tao Tang
Organically modified montmorillonite (OMMT) and Ni 2 O 3 were simultaneously introduced into flame-retardant linear low-density polyethylene/ethylene-vinyl acetate/magnesium hydroxide (LEM) composites. Compared with the LEM composite, the thermal stability, and tensile properties of LEM/ remained basically unchanged when 5 wt% of OMMT/Ni 2 O 3 was substituted for MH. The LOI value increased a little from 27.2 to 27.7%. The data from cone calorimeter test showed that the first and second peak heat release rate was reduced by 19% and 67%, respectively. The total heat release and total smoke production showed a significant reduction by 18% and 36% after incorporation of OMMT/Ni 2 O 3 , respectively. The mechanism study indicated that the combination of OMMT/Ni 2 O 3 cooperates promote the carbonization of the polymer itself into carbon naotubes, which form a more cohesive char layer with magnesium hydroxide during combustion. This is the core factor responsible for the synergistic effect on reducing the heat release and smoke production in the LEM composite.
研究领域:
材料科学
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高分子化学
·
燃烧学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hengtong Zhang,Cailin Liu,Xianyan Ren,Haijun Yang,Shudong Lin
The existed polycarboxylic ether superplasticizer (PCEs) that mainly synthesized in a homogeneous catalytic synthesis has the disadvantages of low conversion rate and poor performance stability. In this paper, high performance PCE-1–5 were synthesized via a heterogeneous H 2 O 2 -ASA (ascorbic acid) redox system catalyzed with MnO 2 , Fe 2 O 3 , Co 2 O 3 , Ni 2 O 3 and ZnO respectively. GPC data show that the molecular weights of PCE-1–5 are higher than that of PCE0 (synthesized via a H 2 O 2 -ASA redox system without transition metal oxides). HPLC indicates that the conversion rates of macromonomer for PCE-1–5 are up to 99.81%, which is 27.47% higher than that of PCE0 (72.34%). As results, PCE-1–5 have a good dispersibility, high water reducing rate and are much benefits to the early hydration of cement paste and the strength of concrete. The mechanism research shows that the cement samples doped with PCE-1–5 have a larger zeta potential , stronger complexing ability with Ca 2+ , and thicker adsorption layer that is as high as 1.03 nm, which makes the spread diameter of cement paste as high as 309 mm. In addition, the obtained microstructure is much denser as is reflected by the nanometer pore size of hardened cement paste (12.26 nm), which makes the 28 d compressive strength of cement test block as high as 60.19 MPa. Generally, the heterogeneous transition metal oxide catalytic redox system provides a good choice for the synthesis of PCEs.
研究领域:
材料科学
·
化学工程
·
水泥与混凝土技术
✓ 已验证
产品关联
DOI
高影响因子
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