Lubricants
·
2024
·Vol. 12
·期 5
·146
·
IF 3.1
Shuo Xiang,Xinghao Zhi,Hebin Bao,Yan He,Qinhui Zhang,Shigang Lin,Bo Hu,Senao Wang,Peng Lu,Xin Yang,Qiang Tian,Xin Du
The layered double hydroxide (LDH) has been practically applied in the field of tribology and materials science due to its unique physicochemical properties, weak bonding, flexible structural composition, and adjustable interlayer space. In this work, a series of ultrathin and flexible composition of Ni-Fe LDH samples were prepared via a cost-effective room-temperature co-precipitation process. Then, they were mechanically dispersed into GTL base oil and their lubricating performance were tested by a four-ball tribometer. It is found that the variation of Ni-Fe ratio of Ni-Fe LDH has a great influence on the improvement of lubricating performance of GTL base oil. At the same concentration (0.3 mg/mL), the Ni-Fe LDH with Ni/Fe ratio of 6 was demonstrated to exhibit the best lubricating performance and the AFC, WSD, the wear volume, surface roughness and average wear scar depth decreased 51.3%, 30.8%, 78.4%, 6.7% and 50.0%, respectively. SEM-EDS and X-ray photoelectron spectra illustrated that the tribo-chemical film consisting of iron oxides and NiO with better mechanical properties formed and slowly replaced the physical film, which resists scuffing and protect solid surface from severe collisions.
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Nanomaterials
·
2024
·Vol. 14
·期 10
·853
·
IF 4.4
Xiaohan Wang,Han Tian,Libo Zhu,Shujing Li,Xiangzhi Cui
The application of electrochemical hydrogen evolution reaction (HER) for renewable energy conversion contributes to the ultimate goal of a zero-carbon emission society. Metal phosphides have been considered as promising HER catalysts in the alkaline environment, which, unfortunately, is still limited owing to the weak adsorption of H* and easy dissolution during operation. Herein, a bimetallic NiCoP-2/NF phosphide is constructed on nickel foam (NF), requiring rather low overpotentials of 150 mV and 169 mV to meet the current densities of 500 and 1000 mA cm−2, respectively, and able to operate stably for 100 h without detectable activity decay. The excellent HER performance is obtained thanks to the synergetic catalytic effect between Ni and Co, among which Ni is introduced to enhance the intrinsic activity and Co increases the electrochemically active area. Meanwhile, the protection of the externally generated amorphous phosphorus oxide layer improves the stability of NiCoP/NF. An electrolyser using NiCoP-2/NF as both cathode and anode catalysts in an alkaline solution can produce hydrogen with low electric consumption (overpotential of 270 mV at 500 mA cm−2).
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yingying Jin,Kaihao Fan,Miao Feng,Yaoguang Wang,Hongfeng Chen,Xuesong Liu
This study investigates synergistic effects in Ni/CeO 2 catalysts for ammonia decomposition, comparing impregnation and mechanical mixing preparation methods. The impregnated catalyst achieved >90 % NH 3 conversion above 500 °C, outperforming Ni/SiO 2 and mixed counterparts. Strong interactions at the Ni-CeO 2 interface facilitated the formation of Ni-O-Ce bonds, lattice distortion, and oxygen vacancies (O v )/Ce 3+ species, enhancing Ni dispersion (34.7 nm vs. 73.1 nm) and electron transfer. Optimal NH 3 pretreatment (550 °C, 1.5 h) generated metallic Ni 0 as the primary active species, with higher Ni 0 content (XPS) and reducibility (H 2 -TPR). The novelty lies in establishing how NH 3 pretreatment dynamically assembles contiguous Ce 3+ -O v -Ni 0 triads. These sites facilitate rate-limiting N 2 desorption through localized electron donation from O v and Ce 3+ to Ni 0 , which weakens N-N bonds (NH 3 -TPD). Impregnation-derived synergy: (i) enhances Ni dispersion/reduction, (ii) promotes O v formation, and (iii) enables NH 3 -pretreatment-induced assembly of contiguous Ce 3+ -O v -Ni 0 triads that create electron-rich sites, lowering the activation barrier. This work provides a foundation for designing cost-effective catalysts via atomic-scale control of metal-support interactions.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Guangqiu Zhang,Yihang Zhao,Jianwei Zhao,Lirong Qin,Yi Li,Yujing Wang,Yong Tang
Nickel-zinc (Ni-Zn) batteries have attracted significant research interest due to their high safety, low cost, and high theoretical specific capacity. This investigation introduces a simple synthesis route for fabricating a nickel-cobalt-chromium layered double hydroxide/nickel-cobalt oxide (NiCoCr-LDH/NiCo 2 O 4 ) hierarchical composite on nickel foam (NF), aimed at advancing Ni-Zn battery performance. The synergistic integration of uniformly distributed NiCo 2 O 4 nanoneedles with NiCoCr-LDH nanosheets facilitates expedited ion diffusion and proliferates active reaction sites. Under optimized conditions, the NiCoCr-LDH/NiCo 2 O 4 @NF electrode exhibits a superior specific capacity of 234 mAh g⁻ 1 at 1 A g⁻ 1 , coupled with enhanced cycling endurance. When configured into a full cell alongside zinc plate, it attains an energy density of 395.7 Wh kg⁻ 1 and a peak power density of 15.6 kW kg⁻ 1 . Remarkably, the device sustains 90.7% of its initial capacity after an extensive 5,000-cycle operation, underscoring its exceptional prolonged cyclability. This study contributes crucial understandings for guiding the evolution of high-performance supercapacitors and Ni-Zn batteries.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Ying-ying Hu,Caiyue Gao,Xiao-qin Wu
Environmental pollution is a hot topic of concern for countries around the world. Therefore, {[Ni(NDC)(phen)(H 2 O)]• n ( Ni-1 , NDC = 2,6-naphthalenedicarboxylic acid, phen = o-phenanthroline), a 1D Ni-MOF, was synthesized using the solvothermal method as an electrochemical-fluorescence dual sensor for detecting phenylenediamine isomers. By the difference in the position of the reduction peaks, it is possible to distinguish between isomers while detecting them. The electrochemical behavior of the Ni-1 /GCE sensing phenylenediamine isomers was analyzed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The LODs of o-PDA, m-PDA and p-PDA were 2.567 μM, 1.984 μM and 0.4003 μM in the detection range of 5–50 μM, respectively. Ni-1 was highly stable in aqueous solution (H 2 O), so it was dissolved in H 2 O to fabricate the Ni-1 /H 2 O fluorescence sensor. Ni-1 /H 2 O exhibited Stern-Volmer quenching constants of 6.080 × 10 4 M −1 , 2.086 × 10 3 M −1 , and 6.417 × 10 3 M −1 for o-PDA, m-PDA, and p-PDA, respectively. In addition, this dual sensor still shown excellent immunity to interference under the organic interferents. This work provides an efficient, convenient, and sensitive dual sensing method for the detection and differentiation of phenylenediamine isomers, which is of great significance for the detection of aromatic amines in the fields of wastewater discharge, environmental protection, and food safety.
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高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·812
·
IF 4
Xinru Gao,Han Meng,Changan Wang,Jinzhang Tao,Hongyi Gao
The development of highly efficient catalysts for the hydrogenation of dicyclopentadiene (DCPD) remains a critical challenge. In this study, we designed a series of bimetallic Ce–Ni metal–organic framework (MOF)-derived nanocatalysts by precisely tuning the Ce/Ni ratio and calcination temperatures. The optimized catalyst, Ni–CeO2(7:3)@C–400 °C, featuring highly dispersed carbon-coated Ni nanoparticles, achieved complete hydrogenation of DCPD to tetrahydrodicyclopentadiene (THDCPD) with 100% conversion and nearly 100% selectivity within 2 h under 100 °C and 2 MPa. The porous carbon framework significantly facilitated the diffusion and accessibility of DCPD molecules, combined with Ce species reconstructing the electronic structure of Ni active centers through electronic interactions, synergistically enhancing the hydrogenation efficiency. Furthermore, the catalyst demonstrated good structural stability. This work not only provides a robust strategy for the rational design of bimetallic MOF-derived catalysts but also highlights their potential for practical applications in industrial hydrogenation processes.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haidong Wang,Yongxin Jiao,Guanghui Zhang,Zexi Zhang,Weiguang Ma,Chenghua Sun,Xu Zong
The hydrogen evolution performances of electrocatalysts are greatly restricted by their unfavorable hydrogen evolution kinetics and the undesirable accumulation of as-evolved gas bubbles on the electrocatalysts surface. Herein, we present the fabrication of self-supporting multi-heterointerfacial nanoarrays electrode toward addressing these challenges simultaneously. A monolith Ni 3 N/Ni@W 2 N 3 electrode is prepared, which exhibits a multi-heterojunction interface between the different components. The construction of this multi-heterojunction interface allows for the redistribution of the electrons, thus alleviating the strong Ni-H bond and optimizing the hydrogen adsorption free energy toward more efficient HER catalysis. Moreover, by virtue of the distinct nanoarray structure, the Ni 3 N/Ni@W 2 N 3 nanoarrays exhibit improved hydrophilicity and superaerophobicity compared with Ni/Ni 3 N, facilitating water contact and enabling more efficient detachment of the as-evolved H 2 bubbles from the surface. Benefiting from these attractive features, the Ni 3 N/Ni@W 2 N 3 nanoarrays deliver an attractive alkaline HER catalytic activity with a low overpotential of 66 mV to achieve a current density of 10 mA cm −2 , which is comparable with that of the benchmark Pt/C electrode. Moreover, the electrode exhibits remarkable stability during long-term electrolysis. The simultaneous interface and nanostructure engineering provide a feasible pathway for obtaining high-performance electrodes and beyond for various electrochemical reactions.
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高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 3
·1-11
·
IF 2.4
Wen Chenglong,Liu Kang,Lu Yi,Wu Xintian,Li Shuning,Lu Mohong,Zhu Jie,Li Mingshi,Song Chunshan,Lu Xiaosong
Ni/SAPO-11 catalysts with highly dispersed Ni (TA-Ni/SA-11) were prepared using tartaric acid as a dispersant. The effect of the tartaric acid content on the physiochemical properties of the TA-Ni/SA-11 catalysts and their n-heptane hydroisomerization performance were investigated. TA-Ni/SA-11 exhibits smaller Ni particles and more Ni active sites in comparison to conventional Ni/SAPO-11 prepared via the impregnation method due to the interaction between tartaric acid and Ni 2+ . As the molar ratio of tartaric acid and Ni 2+ (n TA /n Ni ) increases, the number of Ni active sites in TA-Ni/SA-11 rises, while the surface area and relative crystallinity decrease because of the dealumination of SAPO-11. When n TA /n Ni is 0.75, 0.75TA-Ni/SA-11 presents the highest n-heptane conversion of 82.4% and isomer selectivity of 90.5%, as well as the lowest cracking selectivity of 9.0% at 380 °C, 1.5 MPa, 2 h − 1 , and a volume ratio of H 2 to n-heptane of 400 among these catalysts. Graphical
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Shiliang Zhang,Kaiyu Qi,Baoshuai Du,Gengzeng Zhu,Xiaoyan Liu,Bangwen Zhang
Rechargeable LIBs have been playing the dominant role in the market of consumer electronics, electric vehicles, and grid storage. At present, graphite, as a traditional anode material, cannot meet the requirements of high-energy-density LIBs due to its low theoretical specific capacity (372 mAh g −1 ). Here, we report Ni-MoS 2 /rGO composites synthesized by a ligand-assisted hydrothermal method, in which curled Ni-doped MoS 2 nanosheets (Ni-MoS 2 ) grown on reduced graphene oxide (rGO) had a loose thin-layered microstructure with high electrochemical activities, ensuring excellent lithium-ion storage performance of the composites. Benefitting from high electrochemical activities of the Ni-MoS 2 and high conductivity of the rGO, the Ni-MoS 2 /rGO composites exhibited high reversible capacitance and fast reaction kinetics. As a result, a high capacity of reversible lithium-ion storage up to 995 mAh g −1 (after 100 cycles) and a good rate capability were achieved by the Ni-MoS 2 /rGO composites.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Xuan Liu,Jie Chao,Feifei Guo,Liangliang Chang,Zengzhe Xi
To address rapid carrier recombination and low magnetic separation efficiency in piezocatalysis, Gd/Ni co-doped BiFeO3 nanoparticles were synthesized via a sol–gel method. Rietveld refinement confirmed lattice distortion and secondary phase formation at high doping levels. Gd/Ni doping induces a phase transition in BFO from rhombohedral to orthorhombic, with the Pnma proportion reaching 84.15% at x = 0.09. Gd/Ni co-doping induced 12.7% oxygen vacancy concentration, suppressing electron–hole recombination, while enhanced Dzyaloshinskii–Moriya interaction increased saturation magnetization by 17.85-fold (magnetic recovery > 95%). The optimized sample (x = 0.09) achieved 80.94% ofloxacin degradation in 120 min (twice that of pristine BiFeO3), retaining 71.53% efficiency after 4 cycles. Radical trapping and EPR identified ˙OH and ˙O2− as dominant species, revealing a ferroelectric–piezoelectric synergistic mechanism. This work provides a strategy for designing magnetically recoverable piezocatalysts for complex wastewater treatment.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Jie Wang,Mengxia Wang,Xincheng Li,Xianmo Gu,Peng Kong,Ruiyi Wang,Xuebin Ke,Guangtao Yu,Zhanfeng Zheng
The design of selective and stable non-precious metal catalysts for hydrogenation of alkyne is highly desirable. In this study, L -lysine modification strategy is applied to support Ni nanoparticles , which greatly improves the stability and photocatalytic performance in the hydrogenation of phenylacetylene to styrene . The robust stability is attributed to that both amino and carboxyl groups of L -lysine can function simultaneously as the anchor, much stronger than a single group, to strongly interact with metallic Ni via N and O coordination. The high selectivity to styrene is due to that L -lysine modification results in a larger adsorption energy difference between styrene and phenylacetylene on the surface of Ni, therefore phenylacetylene is preferentially adsorbed on Ni surface. This protocol shows that the modulation of interaction between ligands and Ni is favorable to design stable, active and selective catalysts for hydrogenation of alkynes.
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CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Mengyang Xu,Bingqing Chang,Jinze Li,Huiqin Wang,Pengwei Huo
The assembly of different Metal organic framework (MOFs) into hybrid heterostructures has proven to be a promising strategy that can effectively break through the limited regulatory capacity of single metal sites. Here, an S-scheme heterostructure (Fe 3 Ni-MOF) based on homologous ligands (1,4-phthalic acid) of ultra-thin Ni-MOF and Fe-MOF nanoparticles with directional electron transport channels, was developed and used it for photoreduction of CO 2 . Under the S-scheme electric field mechanism, the photogenerated carrier can achieve efficient directional separation through Fe–O–Ni atomic bond, which significantly reduces the energy barrier of the rate-determining step. Results show that the performance of Fe 3 Ni-MOF (63.5 μmol g –1 ) was 20 and 3.2 times higher than that of Ni-MOF and Fe-MOF, respectively, and exhibits excellent CO selectivity (96.4%) and stability. Transmission electron microscopy and atomic force microscopy revealed the two-molecular-layers structure of Ni-MOF and the micro-assembly structure of Fe 3 Ni-MOF, which can shorten the electron transport distance and increase the molecular mass transfer rate. X-ray photoelectron spectroscopy, electron spin resonance and electron density difference calculations reveal that interfacial electric fields and atomic bonds work together to promote directional carrier separation, resulting in the accumulation of holes on Ni-MOF and electrons on Fe-MOF. The Gibbs free energy calculation and in-situ Fourier transformed infrared spectroscopy validate that the micro-assembled S-scheme heterostructures with directional electron transport channels can significantly reduce the activation energy barrier of the reaction. This study not only proves the feasibility of constructing MOFs S-scheme heterostructures using homologous ligands, but also provides a new way to overcome the limitations of monometallic MOFs. This strategy is expected to open up a new avenue to design efficient photocatalysts.
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