JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Di Gao,Jian-Zhi Yang,Heng-Yu Wei,Kong-Zhai Li,Min Lin,Xing Zhu
C e-e Zr solid solution formation strengthens the metal-support interaction. • The catalyst reached 79.02% CO 2 conversion and methanation rate 26.35 mmol·g cat −1 ·h −1 . • Dual-role oxygen vacancies enhance charge separation and CO 2 activation. Photothermal Carbon dioxide (CO 2 ) hydrogenation is a promising strategy for solar-fuel production, but its performance is often limited by inefficient charge separation and poor low-temperature activity. Herein, Ni/Ce-Zr solid solution catalysts were developed by introducing lattice distortion to regulate the electronic structure and generate abundant oxygen vacancies. The resulting oxygen vacancies promote charge separation, enhance CO 2 activation, and strengthen the photothermal synergistic effect. Among the catalysts, 20Ni/Ce 0.75 Zr 0.25 O 2 exhibited the best performance, achieving 79.02% CO 2 conversion, over 99.00% CH 4 selectivity, a methanation rate of 26.35 ± 0.05 mmol·g cat −1 ·h −1 , and an apparent activation energy of 16.23 ± 0.70 kJ/mol at 250 °C, while maintaining stable operation for over 180 h. In situ DRIFTS results reveal that abundant oxygen vacancies facilitate the hydrogenation of key intermediates and suppress carbonate accumulation, thereby preventing catalyst deactivation. These findings demonstrate that oxygen-vacancy engineering is an effective approach for improving photothermal CO 2 methanation and provide guidance for the design of efficient solar-driven CO 2 conversion catalysts. Oxygen Vacancy-Mediated Photothermal CO 2 Methanation over Ni/Ce-Zr Solid Solution. Download: Download high-res image (208KB) Download: Download full-size image
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Liming Dai,Chenchen Fang,Fanglei Yao,Xiaoyuan Zhang,Xuefeng Xu,Shangling Han,Jingyao Deng,Junwu Zhu,Jingwen Sun
In-situ generated hydroxides and oxyhydroxides have been gradually recognized as the real active sites of metal organic frameworks (MOFs) towards the oxygen evolution reaction (OER). Nevertheless, the fine phase evolution process is still less of concern and elusive. Herein, we successfully construct serious of Ni-MOFs with differing thickness ranging from 1 nm to 270 nm through a competitive coordination strategy. Utilizing the operando resonance spectroscopy, an accurate phase inversion behavior of the Ni-MOFs has been witnessed during the OER, and demonstrated as a thickness-dependent process. Ultrathin architecture is identified as a positive factor to promote the exchange between MOFs ligands and applied electrolyte during the electrochemical test. Hence, after removing most of the internal ligands, 2D MOFs favor to be transformed as β-NiOOH, which is more active than the generated γ-NiOOH in bulky system. The density function theory (DFT) calculation alongside with the in-situ electrochemistry tests further affirm the β/γ-NiOOH transformation behavior. This work offers a new understanding of the electrocatalytic mechanism from the view point of phase evolution in 2D MOFs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-13
·
IF 2.8
Hu Qi,Teng Yuancheng,Zhao Xiaofeng,Zhou Fei,Arslanov Temirlan,Dai Bo
Zn 1− x Ni x ZrTa 2 O 8 ( x = 0.02, 0.04, 0.06, 0.08, 0.10, 0.12) microwave dielectric ceramics were synthesized by traditional solid-state method. The effect of introducing Ni–O bonds to replace part of Zn–O bonds on the ceramic lattice and microwave dielectric properties was systematically studied. An appropriate amount of Ni 2+ substitution improves the microscopic morphology of crystal, including the grain size, number of pores, number of grain boundaries, and the grain uniformity, giving rise to an increase in the compactness of ceramics and, thereby enhancing the microwave dielectric properties. The Raman analysis prove that the introduction of Ni 2+ is beneficial to enhance the vibrational peak intensity of the oxygen octahedron and effectively improve the Q × f value. However, the introduction of excessive Ni 2+ will lead to the decrease of lattice oxygen and the increase of adsorbed oxygen, and the crystal will become relatively active and unstable, and the microwave performance will decrease. In addition, the substitution of Ni 2+ can also effectively control the resonance temperature coefficient, which is beneficial to improve the τ f value. As a result, Zn 0.94 Ni 0.06 ZrTa 2 O 8 exhibits excellent microwave dielectric properties: ε r = 32.15, Q × f = 15,7500 GHz, τ f = − 33.1 ppm/°C, presenting as a potential candidate for low-loss microwave dielectric materials.
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Zhao Liping,Wang Changzhen,Bai Juan,Wu Ruifang,Li Haitao,Zhao Yongxiang
2-Hydroxytetrahydrofuran (HTHF) is the main by-product of hydrogenation of 1,4-butynediol (BYD) to 1,4-butanediol (BDO) in industry, which is difficult to be effectively removed in the subsequent distillation process and seriously affects the product quality. Here, a series of silica-supported bimetallic Ni–Fe catalysts with different Fe/Ni weight ratios were prepared by using incipient wetness impregnation method and investigated the effect of Fe on the catalyst performance in the hydrogenation of HTHF to BDO. In comparison with monometallic Ni and Fe catalysts, bimetallic Ni–Fe catalysts exhibited better performance for HTHF hydrogenation due to the formation of Ni–Fe alloy phase identified by XRD, TEM, STEM-EDS, H 2 -TPR, NH 3 /H 2 -TPD, Pyridine FTIR and XPS, etc. A mechanism is proposed to explain the promoting effect of Fe, which can be assigned to the synergism between nickel sites with high ability to activate/overflow hydrogen and Fe-containing sites with strong oxophilicity for the activation of the O-C-O bond over the tetrahydrofuran ring. Graphical Abstract
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SURFACE ENGINEERING
·
2023
·
IF 2.8
Hao Liu,Yuelan Di,Haidou Wang,Yuncai Zhao
Metal components in microelectromechanical systems are prone to failure and corrosion due to droplet adhesion in wet environments. Several multi-level structures on the micro-nano scale may induce effective superhydrophobicity to prevent such adhesion. This study proposes a hybrid manufacturing process to generate ‘frame-cone’ textures on the surfaces of metals by combining ultra-fast laser etching and electrodeposition. Periodically distributed frame recesses and pits were coated with nano-submicron Ni coatings with conical shapes, and the pit depth and cone height were controlled by tuning the laser scanning time and current density, respectively. The surface adhesion force was reduced to 22.8 μN, and the static contact angle was maintained at 156.7° using the hybrid process, while the adhesion forces of laser etched samples with the same depth were 164.7 μN. The multi-level ‘frame-cone’ structure stored more air and reduced the contact areas between the bottoms of the pits and droplets. The hybrid process of ultra-fast laser etching and electrodeposition aided in improving the superhydrophobicity, with less damage to the substrate.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 15
·7305-7311
·
IF 3.3
Jie Liu,Yu Chen,Yin Wang,Lu Liu,Qi Chen,Qingqing Shi,Luyi Huang,Xing Chen,Kun Xie
Cobalt phosphide has excellent electrical conductivity, metallic properties, and thermal stability. However, its application is limited due to the few active sites exposed in electrochemical reactions and poor structural stability. Herein, we adopt the strategies of material compounding and structural design to construct CoP@Ni(OH)2 bilayer nanosheets. The bilayer nanosheet structure can provide abundant transport paths for electrons and ions while also exposing more electroactive sites. In addition, the close contact and mutual support of the bilayer nanosheet structure can significantly alleviate material morphological collapse during charging/discharging processes, improving the cycle stability. The advantages of multiple components were combined in CoP@Ni(OH)2 to provide multiple valances for the faradaic redox reactions. The CoP@Ni(OH)2 manifested a specific capacity of 1697.8 C g−1 at 1 A g−1 and maintained a high rate capability of 35.0% even at 20 A g−1. Moreover, the electrode, had great cycling stability, retaining 83.9% of its capacity at 6 A g−1 after 7000 cycles. The asymmetric supercapacitor made of CoP@Ni(OH)2//activated carbon delivered 53.2 W h kg−1 at 800 W kg−1.
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MOLECULES
·
2023
·Vol. 28
·期 10
·4136
·
IF 4.6
Yongwang Ren,Huizhong Xu,Beibei Han,Jing Xu
At present, the selective hydrogenation of α, β-unsaturated aldehydes remains a challenge due to competition between unsaturated functional groups (C=C and C=O). In this study, N-doped carbon deposited on silica-supported nickel Mott–Schottky type catalysts (Ni/SiO2@NxC) was prepared for the selective hydrogenation of cinnamaldehyde (CAL) by using the respective hydrothermal method and high-temperature carbonization method. The prepared optimal Ni/SiO2@N7C catalyst achieved 98.9% conversion and 83.1% selectivity for 3-phenylpropionaldehyde (HCAL) in the selective hydrogenation reaction of CAL. By constructing the Mott–Schottky effect, the electron transfer from metallic Ni to N-doped carbon at their contact interface was promoted, and the electron transfer was demonstrated by XPS and UPS. Experimental results indicated that by modulating the electron density of metallic Ni, the catalytic hydrogenation of C=C bonds was preferentially performed to obtain higher HCAL selectivity. Meanwhile, this work also provides an effective way to design electronically adjustable type catalysts for more selective hydrogenation reactions.Keywords:Ni catalyst;N-doped carbon;electronic effect;cinnamaldehyde hydrogenation
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ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Haihong Xia,Jing Li,Jun Zhao,Minghao Zhou,Jianchun Jiang
Cyclopentanol (CPL) was an eco-friendly solvent as well as important platform chemical which could be generated from biomass-derived furfural (FFA). In this paper, a series of Ni, Cu, Mo, Co bimetallic catalysts with different metals loadings supported on carbon nanotubes (CNT) were synthesized by an impregnation method for aqueous-phase hydrogenation of FFA to obtain CPL. Various effects of reaction parameters such as reaction solvent, reaction temperature, reaction time and different loading amounts of Ni over bimetallic Ni-based CNT catalysts were fully investigated. Among the catalysts studied, (15 + 5) wt% NiCu/CNT catalysts showed a high conversion of FFA and 88% selectivity towards CPL in water and 96% selectivity towards acetal in methanol at the mild condition of 160℃, 2 MPa hydrogen and 4 h reaction time. NiCu bimetallic synergistic effect was interpreted through H2-TPR and NH3-TPD measurement and a possible pathway was proposed. The features of the CNT-supported catalysts were investigated via XRD, XPS, TEM, H2-TPR and NH3-TPD. The Ni and bimetallic NiCu catalysts synthesized in this work were inexpensive and simple, which made them a promising candidate for the conversion of biomass-derived FFA to CPL.
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高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 12
·3568-3578
·
IF 5
Menghui Liu,Chenhui Wang,Zifan Cao,Aiqun Kong,Yusheng Gao,Jinli Zhang,You Han,Wei Li,Yan Fu
A series of 3D self-standing PtRu/Ni(OH)2/NF electrodes is fabricated for electrocatalytic hydrogenation (ECH) of benzoic acid (BA) to cyclohexanecarboxylic acid (CCA). The PtRu/Ni(OH)2 electrocatalyst with a unique coral-shaped architecture possesses outstanding charge transfer ability and abundant active sites. The optimized electrode achieves a BA conversion of 99.00% and a CCA selectivity of 100% in 0.05 M H2SO4 within 80 min, showing a record faradaic efficiency of 43.90% and high performance during 20 cycles of ECH. In situ Raman tests verify the mechanism of the selective hydrogenation of the aromatic ring and density functional theory (DFT) calculations reveal that the electronic interaction between Pt and Ru in the PtRu nanoalloy as well as the electron transfer from the PtRu alloy to the Ni(OH)2 nanosheet tunes the electronic states of PtRu/Ni(OH)2, thereby enhancing the adsorption strength of BA on the electrocatalyst surface. This work offers a promising alternative to the traditional catalytic hydrogenation of BA.
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Inorganics
·
2023
·Vol. 11
·期 4
·170
·
IF 2.9
Zikang Lu,Rikai Liang,Yuqi Shao,Weiju Hao
Achieving high−efficiency and stable hydrogen evolution from water splitting is a great challenge. Herein, a facilely prepared two−dimenssional self−supported catalytic electrode with excellent stability is constructed for large−scale hydrogen production from alkaline simulated seawater. The bifunctional catalytic electrode is prepared by a fast and mild one−step of sodium borohydride etching on a nickel foam (NF) substrate without adding other additives (NF@NiBx−3h). The overpotential of the hydrogen/oxygen evolution reaction (HER/OER) in alkaline−simulated seawater at 10 mA cm−2is 96 mV and 261 mV. At 200 mA cm−2, the NF@NiBx−3h electrode shows good stability over 7 days throughout the water splitting process due to the corrosion resistance of the NF substrate, and strong adhesion between the Ni−B active material and the substrate. This work demonstrates a novel strategy for fabricating catalytic electrodes with high−performance, low cost and excellent stability.Keywords:mild and fast construction;chemical etching;HER;OER;industrial−grade water splitting
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Lubricants
·
2022
·Vol. 10
·期 12
·367
·
IF 3.584
Jiabei Wang,Hong Zhang,Wenjing Hu,Jiusheng Li
China’s rapid industrial development requires more energy consumption based on non-renewable energy resources. The energy consumption caused by unnecessary friction accounts for about 4.5% of the GDP in China. Although grease effectively lubricates machines, lubrication failure may occur under severe conditions. Nanomaterials exhibit intriguing tribological performances and have received much attention regarding lubrication. In this study, oleylamine-modified Ni nanoparticles (OA-Ni) were synthesized and used as lubricant additive in four kinds of commonly used greases: lithium, calcium, composite calcium, and polyurea grease. The OA-Ni were uniformly dispersed in the greases through electromagnetic stirring, ultrasonic vibration, and three-roll grinding. The physicochemical properties and the structure of OA-Ni-doped grease were investigated, while the feasibility of OA-Ni as various grease additives at different contact modes was evaluated by a four-ball friction tester and a UMT-tribolab tester. Tribological tests results revealed that the friction-reducing and anti-wear properties of point-to-point contact were increased by 56.7% and 70.3% in lithium grease, respectively, while those of the point-to-face contact were increased by 59.5% and 68.9% in polyurea grease, respectively. The present work provides not only theoretical guidance of nano nickel modification but also a practical reference for the application of modified nanomaterials to various greases.Keywords:nano-lubrication;modified nanomaterial;multiple greases;tribological properties
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fuzeyu Zhong,Xiaohu Ge,Weixiao Sun,Wei Du,Keng Sang,Chang Yao,Yueqiang Cao,Wenyao Chen,Gang Qian,Xuezhi Duan,Zhirong Yang,Xinggui Zhou,Jing Zhang
Total hydrogenation of hydroxymethylfurfural (HMF) (including hydrogenation of both furan ring and carbonyl group) produces 2,5-bis-(hydroxymethyl) tetrahydrofuran (BHTF), which can be used as rigid polymer monomer, green solvent, or precursor of high-value chemicals and has great market potential. Although Ni is regarded as the most selective metal for the total hydrogenation of HMF, Ni catalysts often suffer sintering and leaching under hydrothermal conditions. In this regard, development of hydrothermally stable Ni catalysts is highly desirable. Here, Ni on well mixed oxides (Ni/Mg a Al 10- a O x ) derived from layered double hydroxide (LDH) precursors was successfully synthesized via co-precipitation. The Ni/Mg a Al 10- a O x showed superior hydrothermal stability during the aqueous phase total hydrogenation of HMF, without noticeable activity loss, leaching and sintering after multiple reuse. In contrast, significant activity loss, leaching and sintering was observed for impregnated Ni counterparts. Catalyst characterization revealed the formation of highly dispersed Ni and well mixed porous oxides after the thermal reduction of the NiMgAl-LDH precursors as well as the stronger metal-support interactions of the NiMgAl-LDH as compared to impregnated Ni catalysts with similar Ni particle size. The markedly improved hydrothermal stability was due to enhanced metal support interactions derived from the LDH precursors, which prevents the undesired agglomeration and leaching of Ni in the hydrothermal environment. Moreover, a high BTHF yield of 99.0% was obtained using the Ni/Mg a Al 10- a O x under optimal reaction conditions. Density functional theory calculations suggest that the total hydrogenation of HMF over the Ni catalysts proceeds through the alkoxy pathway via “flat-lying” adsorption.
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