Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Adil Shafi Ganie,Shahid Hussain,Aadil Ahmad Bhat,Zhenyu Miao,Talib K. Ibrahim,Xiangzhao Zhang,Mohammed Mujahid Alam,Abdullah G. Al-Sehemi,Rajesh Kumar Manavalan,Guanjun Qiao,Guiwu Liu
The continuous release of harmful gases and increased industrial activities has made environmental monitoring essential for evaluating their impact on human health and ecosystem. In this study, a spherical nanostructure of Nickel (Ni) doped CeO 2 was derived from hydrothermally synthesized cerium-based metal-organic framework (Ce-MOF) via MOF encapsulation-calcination method for ultrasensitive detection of H 2 S at ppb level. The physical characterizations and microstructure of the Ni-CeO 2 composite revealed porous surface with a hollow spherical framework structure. The H 2 S gas-sensing performance of CeO 2 increased with Ni doping and exhibited remarkable sensitivity up to 100 ppb at low operational temperature. Notably, Ni-CeO 2 -6 composite shows an improved response of 108 (R a /R g ) at an operational temperature of 100°C. Furthermore, NC-6 displays good linearity (R 2 =0.998) towards H 2 S concentration with a low detection limit (8.68 ppb). The composite nanostructure shows good humid tolerance with minimum response deviation (6 %), on increasing the relative humidity (RH) from 15 % to 60 % at room temperature. In addition to this, the composite nanostructure shows excellent selectivity towards H 2 S, combined with good repeatability, and sustained stability. The enhanced response of Ni-doped CeO 2 can be correlated with increased surface area, porous morphology, and reactive oxygen sites on the surface. The study reveals the synergistic interplay of MOF-derived framework and Ni doping for increasing oxygen vacancies and enhancing the surface reactivity for improved gas-sensing performance.
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Inorganic Chemistry Frontiers
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2025
·
IF 6.4
Ting Wu,Jianpeng Sun,Zhan Zhao,Kelei Huang,Xiangchao Meng
Modulation of d-band center of Ni to achieve an equilibrium between H-adsorption and Hdesorption (H ads /H des ) remains a great challenge. Herein, Ni@C derived from MOFs was treated by ultraviolet light. It was found that sp 2 edge carbon were converted to sp 3 defective carbon and further combined with Ni clusters. Experimental and theoretical calculations confirmed that the enhanced d-p orbital hybridization between C-Ni promoted a large negative shift of the dband center of Ni, which was in favor of improving the HER activity of the catalyst. Moreover, the core-shell structure of carbon-coated Ni effectively protected the Ni sites and improved its catalytic stability when applied in electrocatalytic water splitting. As a result, as-prepared UV-Ni@C/NF exhibited excellent HER activity in both alkaline aqueous solution (overpotential of 309 mV at 1000 mA cm -2 ) and acidic aqueous solution (overpotential of 446 mV at 1000 mA cm -2 ). This study indicated the UV-illumination-induced defects method as a feasible strategy to precisely regulate the d-band center of Ni.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Yongyan Xue,Jing Chen,Jinglin Gou,Jie Yang,Tuoping Hu,Jingjing Jiao,Xiao-Qing Wang
Achieving clean hydrogen energy requires the logical development of stable, high-performance, and inexpensive hydrogen evolution reaction (HER) electrocatalysts. Herein, a range of Ni-MOF@MoS 2 -X/NF (X = 0.05, 0.06, 0.10, 0.15, 0.20) heterogeneous electrocatalysts were constructed by anchoring MoS 2 nanosheets onto the surface of nickel-based metal-organic framework (Ni-MOF) material self-supported on nickel foam (NF) via weak interactions under a two-step solvothermal method, which exhibited flower-like microspheres with interconnected nanosheets. Compared with Ni-MOF/NF, Ni-MOF@MoS 2 -X/NF (X = 0.05, 0.06, 0.10, 0.15, 0.20) show prominent HER electrocatalytic property in 1.0 M KOH solution. Specifically, the optimal Ni-MOF@MoS 2 -0.15/NF exhibits better HER electrocatalytic property than the Pt/C catalyst, which has a lower overpotential of only 25 mV with the Tafel slope of 54.68 mV dec −1 at a current density of 10 mA cm −2 in alkaline solution. Furthermore, in natural seawater, an overpotential of 90 mV was required to drive the HER process at a current density of 10 mA cm −2 . The 60 h stability tests of Ni-MOF@MoS 2 -0.15/NF in natural seawater and 1.0 M KOH showed excellent endurance. Density functional theory (DFT) calculations indicate that the ΔG H∗ of Ni-MOF@MoS 2 (0.50 eV) is lower than that of Ni-MOF (0.96 eV). This work presents a novel approach to constructing effective HER catalysts made of non-precious metals in natural seawater.
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Batteries-Basel
·
2025
·Vol. 11
·期 9
·342
·
IF 4.8
Wei Cao,Chenhan Xiong,Yanqiu Yu,Xiang Ji,Hao Xu,Ziwei Chen,Jun Chen,Rui Wang
Nickel–zinc batteries are promising candidates for safe, cost-effective, and high-power energy storage. However, the poor cycling stability of zinc anodes, mainly caused by dendrite growth and dissolution, remains a major challenge for their practical application. Herein, carbon-coated nano-ZnO (ZnO@C) composites were synthesized via a sol–gel method using polyvinyl alcohol (PVA) and zinc acetate as precursors. By systematically tuning the carbon content, the ZnO@C-6 sample with a carbon-to-ZnO mass ratio of 1:6 exhibited the best structural and electrochemical performance. Characterization confirmed a uniform amorphous carbon layer that enhanced conductivity and inhibited ZnO dissolution. Electrochemical tests demonstrated that ZnO@C-6 exhibited high reversible capacity (500 mAh g−1at 12 C after 1000 cycles), coulombic efficiency (>80%), and superior rate capability up to 30 C. Post-cycling SEM confirmed that the carbon coating effectively inhibits dendrite formation and preserves electrode morphology. These findings highlight the critical role of carbon coatings in stabilizing ZnO-based anodes and offer a viable pathway toward high-performance Ni-Zn batteries.
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ChemistrySelect
·
2025
·Vol. 10
·期 37
·e04026
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IF 2
Hongwei Li,Zhibin Liu,Pengju Lei,Jichong Xia,Shoudeng Wang,Guixian Li,Xinhong Zhao,Dong ji
A PEG-400-assisted impregnation-precipitation method synthesized 50 wt% Ni/AC catalysts for dinitrotoluene (DNT) hydrogenation. Optimal PEG-400 dosage (0.4 g) suppressed Ni agglomeration via steric hindrance, yielding uniform 10.9-nm Ni nanoparticles and mesopores (12.24 nm). This enhanced dispersion and mass transfer, achieving complete DNT conversion in 5 min under mild conditions (120 °C, 2.1 MPa H 2 ) with 99.99% TDA selectivity and zero tar. The catalyst retained > 95.5% conversion and > 97.3% selectivity over 10 cycles, demonstrating exceptional stability. PEG's dual role in structural control and pore engineering effectively addresses the dispersion challenges inherent to high-loading catalysts. Graphical PEG-400 directs the synthesis of a 50 wt% Ni/AC catalyst via impregnation-precipitation. Optimal PEG dosage (0.4 g) enables steric hindrance control, yielding uniform 10.9-nm Ni nanoparticles and mesopores. This catalyst achieves complete DNT hydrogenation to TDA in 5 min (120 °C; 2.1 MPa H 2 ) with > 99.99% selectivity and zero tar, retaining high performance over 10 cycles.
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Nano-Micro Letters
·
2025
·Vol. 18
·期 1
·5
·
IF 36.3
Huang Rulu,Liu Chao,Zhang Kaili,Jiang Jianchun,Tian Ziqi,Chai Yongming,Wang Kui
A porous carbon-supported Ni-ZnO nanoparticles catalyst (Ni-ZnO/AC) was synthesized by low-temperature coprecipitation, demonstrating exceptional catalytic activity and stability.
Selective hydrogenation of 5-hydroxymethylfurfural (HMF) to 2,5-bis(hydroxymethyl)furan (97.5%) or 2,5-dimethylfuran (99.5%) is achieved over Ni-ZnO/AC catalyst by solvent-tuning.
Solvent-catalyst interaction jointly regulates hydrodeoxygenation behavior in HMF hydrogenation by modulating rate and pathway via a hydrogen shuttle mechanism.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wenming Guo,Tianci Hu,Hang Qin,Pengzhao Gao,Hanning Xiao
In this paper, Ni/SiC x O y /P–SiC was prepared as the core part of microreactor for the hydrogen production of ethanol steam reforming (ESR). The Ni/SiC x O y catalysts were supported on the porous SiC ceramic (P–SiC) by the inverse microemulsion process using the xylene solution of polycarbosilane (PCS) and the aqueous solution of nickel nitrate as the oil phase and the water phase, respectively. The morphology, loading strength and in situ reduction of the catalysts, and the performance of the catalysts for hydrogen production from ESR were investigated. The Ni catalyst particles exhibited a nearly spherical morphology and a narrow particle size distribution with an average particle size of 127 nm. The combination of the Ni/SiC x O y catalysts and the P–SiC, characterized by ultrasonic vibration for 300 s, showed good strength. Moreover, the ESR with Ni/SiC x O y /P–SiC as the core part of the catalytic microreactor showed that the ethanol conversion and selectivity of H 2 were still up to 91% and 72% after 210 min, respectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Lin Cheng,Min Xie,Yitong Sun,Hong Liu
Constructing Z-scheme heterojunction is considered to be a promising strategy to isolate photogenerated carriers and boost the activity of the photocatalysts . Here in, a novel Z-scheme Bi 2 WO 6 /Ni-MOF heterojunction with intimate interface was constructed via wrapping flowerlike Bi 2 WO 6 on 2D Ni-MOF sheets. The resultant Bi 2 WO 6 /Ni-MOF heterojunction displayed superior photocatalytic performance with respect to methylene blue degradation under visible light illumination. When the content of Ni-MOF was 20 wt%, the Bi 2 WO 6 /Ni-MOF heterojunction achieved the highest activity, which was 24.0 and 6.4 folds that of the pristine Ni-MOF and Bi 2 WO 6 , respectively. The superior degradation performance was caused by the formation of a direct Z-scheme heterostructure between Ni-MOF and Bi 2 WO 6 , which boosted the separation of photoinduced carriers. The principal active species and possible photocatalytic mechanism were also explored. This study provides a pathway to design and fabricate efficient Z-scheme photocatalysts for environmental remediation.
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Reaction Kinetics Mechanisms and Catalysis
·
2024
·Vol. 137
·期 3
·1535-1552
·
IF 1.7
Feng Shangzhen,Zhou Hantao,Jiang Huanjin,Yang Jie,Chen Jixiang
Herein, the Ni–Co alloy supported on TiO 2 catalysts were prepared by sol–gel method assisted with Polymethyl Methacrylate (PMMA) template, and they were tested for in situ aqueous phase hydrodeoxygenation (HDO) of methyl palmitate to hydrocarbons using methanol as hydrogen donor. It has been found that the introduction of PMMA decreases the Ni–Co alloy particles size, reduces the metal-support interactions (SMSI), constructs the mesopores and enlarges the mesopore size. Also, the Ni–Co alloy particles can be partially embedded in TiO 2 , beneficial to the catalyst stability since the sintering and leaching of the Ni–Co alloy particles can be suppressed under hydrothermal condition. In the in situ HDO of methyl palmitate, the main deoxygenation pathway is decarboxylation/decarbonylation on the Ni–Co alloy catalysts. The catalysts prepared with PMMA exhibits higher activity than that without PMMA, giving the pentadecane yield of 86.2% at 310 °C. This is ascribed to their more exposed active sites and wider mesopores. Moreover, the catalyst is not obviously deactivated during five reactions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Kai Wang,Nini Zhao,Haiyan Xie,Jingzhi Wang,Wenli Xu,Zhiliang Jin
Improving the separation efficiency of semiconductor photogenerated carriers is an important way to enhance the photocatalytic activity of water splitting. To establish an efficient photocatalytic hydrogen production system, a practical method combining metal-like cocatalysts with semiconductors was designed. This article prepared Ni-CdS by modifying Prussian blue analogues and synthesized Ni-CdS/1T-WS 2 composite materials by low-temperature mixing with metal-like catalyst 1T-WS 2 . At the optimal load concentration, it can reach 62.65 mmol g -1 . Firstly, the close contact interface formed between the two enables rapid transfer of photo generated electrons . Secondly, metal-like cocatalysts have a strong attraction to the charges generated by light, forcing electron hole separation and exacerbating this effect under illumination. This has been strongly demonstrated through a series of characterizations and in-situ radiation X-ray photoelectron spectroscopy. In summary, this study provides a reliable and clear understanding for the modification of Prussian blue analogues and the regulation of photo induced charge transfer by metal-like cocatalysts.
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JOURNAL OF RARE EARTHS
·
2017
·
IF 2.429
Yang Han,Bo Wen,Mingyuan Zhu,Bin Dai
Herein, lanthanum was incorporated via hydrothermal synthesis into a MCM-41 framework structure with La/Si molar ratios from 0.01 to 0.1. Samples of NiO supported on LaMCM-41 were prepared using the impregnation method. The catalyst performance was evaluated using a fixed bed CO methanation reactor. A Ni/LaMCM-41 catalyst with La/Si = 0.1 shows the best catalytic performance with a CO conversion of almost 100% and a CH 4 selectivity of 89.5% at 250 °C under a pressure of 1.5 MPa and at an airspeed of 36,000 mL/(g·h). Compared with Ni–La/MCM-41(La/Si = 0.1) and Ni/MCM-41 prepared via the impregnation method, Ni/LaMCM-41(La/Si = 0.1) shows a higher CO conversion and CH 4 selectivity. In a 100 h stability test, the Ni/LaMCM-41(La/Si = 0.1) catalyst shows excellent stability; furthermore, the CO conversion is always greater than 98.0%, which is significantly better than the results for Ni/MCM-41. We experimentally demonstrate that elemental La enters the framework of MCM-41. The Ni/LaMCM-41 catalyst performs well because the La reduces the average particle size of the NiO particles and enhances the interaction between NiO and MCM-41; moreover, the introduction of La significantly inhibits the sintering of the catalyst and the formation of carbon deposits .
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Wenlong Zhang,Huanxin Li,Han Zhou,Xiaohui Ning
Carbonaceous materials that possess reversible anions storage capacity and can worked as the cathode for Ni/NiCl 2 -Graphite battery . However, differences in storage capacity of carbonaceous cathodes and factors affecting anions storage capacity have not been thoroughly investigated. Here, we systematically evaluated the electrochemical properties and intercalation reaction mechanism of carbonaceous materials cathodes firstly. Expanded graphite and graphite paper cathodes display the highest specific capacity of 72 mAh/g and diffusion-controlled capacity ratios (∼98 %). X-ray powder diffraction and Raman spectroscopy analysis on the graphite intermetallic compounds confirmed the presence of stage-5 intercalation/de-intercalation reactions. Density functional theory calculation and ionic diffusion model analysis showed that the intercalation and diffusion process of AlCl 4 - in graphite interlayers play a crucial role in anions storage reaction. Rich-in-edged outer graphite-layers are more conducive to form intercalation reaction active sites and store anions effectively. The expanded graphite electrode exhibits the highest intercalation reaction ratio (φ R-GP = 1.40), confirming sufficient intercalation reaction active sites in each unit mass. And the multiple wrinkles and curled graphite sheets in expanded graphite provide adequate ionic transport/diffusion channels during electrochemical intercalation/de-intercalation reactions. Our findings provide significant support for understanding anions storage behaviors and designing cathodes with high anions storage capacity in the Ni/NiCl 2 -Graphite battery .
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