COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Feng Chen,Junshuang Zhou,Wenfeng Peng,Xiaowen Feng,Zikang Zhao,Yubin Yuan,Tianshuo Wang,Faming Gao
The development of efficient and durable non-precious metal catalysts for hydrogen evolution reaction (HER) remains a significant challenge. In this work, we present a novel approach combining heterojunction and structural engineering to enhance HER performance. A NiO/Ni layer with a heterogeneous structure is grown on CuO nanorod arrays supported by copper foam. This 3D nanostructure increases the density of active sites, improves mass and electron transport, and accelerates HER kinetics. The rough surface also facilitates rapid bubble release, enhancing catalyst stability under high currents. As a result, the CuO@NiO/Ni catalyst exhibits excellent HER performance, with overpotentials of 86.5 and 198.8 mV at 100 and 500 mA cm −2 , respectively. Additionally, a two-electrode electrolytic cell using CuO@NiO/Ni and NiFe LDH achieves 500 mA cm −2 at only 1.64 V and maintains excellent stability over 100 h. These findings highlight the potential of CuO@NiO/Ni as a highly efficient, stable catalyst for industrial-scale water electrolysis, and provide a promising approach to addressing the challenges of non-precious metal-based HER catalysts in industrial settings.
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ENERGY & FUELS
·
2025
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IF 5.3
Lingyi Wang,Wenjing Cui,Yunfei Zhao,Liuqing Yang,Junshe Zhang
This work proposes a facile route to fabricate Ni/SiO2 nanocomposite catalysts for dry reforming of methane, in which the hydrolysis and condensation of tetraethyl orthosilicate starts and then proceeds around the in situ-formed nickel hydroxide colloids that are stabilized by cetyltrimethylammonium bromide during precipitation using ammonium hydroxide. The average size of Ni nanoparticles (NPs) embedded in a macroporous silica matrix monotonically increases as the initial Ni2+ concentration increases from 0.05 to 0.2 M in the precipitation step, and it is around 6 nm when the latter is 0.2 M. At 750 °C and 1 atm, the reverse water gas shift reaction appears to be more important on small Ni particles than on large ones, and reforming stability over large particles (6 nm) is higher than that of small ones (4 and 4.9 nm). The reforming catalyst with the largest Ni NPs exhibits excellent stability at a weight hourly space velocity of 60 L gcat–1 h–1: methane conversion maintains at ∼88% and H2/CO molar ratio marginally fluctuates around 0.97 during the 100 h of continuous operation. After the stability test, the size of Ni NPs slightly increases but the pattern of spatial confinement remains intact. Moreover, the amount of catalytic coke in the spent catalyst is around 0.18 wt %. However, no carbonaceous materials are detected in the spent one by X-ray diffraction, Raman spectroscopy, and transmission electron microscopy. Thus, the proposed method may be used to prepare other nickel-based catalysts for hydrocarbon catalytic transformations involving sintering and/or coking.
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Journal of Materials Chemistry C
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2025
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IF 5.1
Xiangyang Chen,Zhensen Liang,Aodi Hu,Minggang Zhao
L-Cysteine (L-Cys), a sulfur-containing amino acid, plays a crucial role in various biological processes. Rapid and accurate detection of L-Cys in the human body is significant for clinical diagnosis and drug analysis. However, classic electrochemical sensing mechanisms are usually based on redox reactions, and substances with similar redox properties in the serum can easily interfere with the detection process. In this study, we present a novel approach for the detection of L-Cys using Schottky barriers of Ni/Cu2O/Ag nanocubes. The electrode exhibits excellent selectivity towards L-Cys due to the specific interaction between Cu2O and L-Cys through the formation of Cu–S bonds. The Schottky barrier at the Cu2O/Ag interface, formed due to the difference in work functions, impedes electron transfer and can be modulated by the adsorption of charged L-Cys molecules. The introduction of light irradiation enhances the barrier modulation capability, resulting in improved sensitivity. Experimental results demonstrate that the Ni/Cu2O/Ag electrode exhibits a linear response to L-Cys concentration within 0–2400 nM at pH 3.0 and pH 7.0, with a low detection limit of 11.86 nM. The electrode shows excellent performance in real sample analysis, exhibiting high recovery rates and low relative standard deviations. The light-assisted barrier enhancement mechanism provides a new avenue for the development of highly selective and sensitive electrochemical sensors.
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CHEMICAL ENGINEERING SCIENCE
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2025
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IF 4.3
Zhenwen Yang,Ben Niu,Xiaoxiao Duan,Zheng Wei,Ziyi Shui,Guoxia Jiang,Fenglian Zhang,Zhengping Hao
Supported metal catalysts play a pivotal role in heterogeneous catalysis. However, supported metal species tend to aggregate and grow into large particles during thermal treatment owing to weak metal-support interaction, leading to unsatisfactory catalytic performance for many important catalytic reactions (e.g·NH 3 decomposition). Here we report that tailoring the surface chemistry of SiO 2 by amino-functionalization can effectively enhance the interaction with Ni species, yielding well dispersion of Ni nanoparticles since the strong interfacial bonding restricts the migration and aggregation of metal atoms. Upon support functionalization, the chemical environment of Ni species is also modified, which induces remarkable electronic metal-support interaction. As a result, more Ni 0 sites are exposed, favoring the adsorption of NH 3 and the desorption of N 2 . In addition, the amino ligands can help with the storage and transfer of H atoms from the metallic surface of Ni, resulting in favorable H 2 desorption. All of these effects contribute to superior activity. By contrast, the pristine SiO 2 surface is not suitable for anchoring Ni species due to the weak Ni-SiO 2 interaction. The sintered Ni catalyst after thermal treatment suffers from drastic loss of active surface area and displays poor activity. This work proposes a simple strategy for designing well-dispersed metal catalysts and provides insights into the effects of metal-support interaction on the structure and function of metal catalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 19
·1-11
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IF 2.8
Li Canglong,Wen Kexin,Zhang Bing,Chen Jie,Niu Xinshuai,Zou Boyuan,Lu Xuechi,Yang Wenqian
The structure, magnetic behavior and magnetocaloric performance in heavy rare–earth based compounds Tb 2 M TiO 6 ( M = Co, Ni, Cu) have been experimentally investigated in this work. The structural analysis indicates that Tb 2 CoTiO 6 and Tb 2 NiTiO 6 crystallize in a monoclinic double perovskite structure, while Tb 2 CuTiO 6 forms a hexagonal layered structure. The magnetic measurements reveal that the samples show high magnetic reversibility within a wide temperature range. The high-temperature Curie–Weiss fitting suggests that the antiferromagnetic coupling between RE 3+ and RE 3+ is dominant at low temperatures. The Arrott-plots imply that the magnetic transition in Tb 2 M TiO 6 is of second–order nature according to the Banerjee’s criteria. The magnetic entropy change − Δ S M is evaluated to be 10.7, 16.2 and 13.2 J kg −1 K −1 for Tb 2 CoTiO 6 , Tb 2 NiTiO 6 and Tb 2 CuTiO 6 at 4 K and magnetic field change Δ H = 6 T, respectively. The work suggests that the lack of 3 d –3 d coupling in the design of double perovskites is one of the potential approaches for developing low-temperature magnetic refrigeration materials.
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Coatings
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2025
·Vol. 15
·期 7
·825
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IF 2.8
Jiefeng Wang,Shilin Li,Yifan Guo,Jiaqi Ding,Zhi Lu
A novel catalyst with a metal sulfide/hydroxide heterostructure was prepared by introducing sulfur ions into NiMnFe layered hydroxide by a simple hydrothermal method, using a series of characterization methods and electrochemical tests to explore the optimal sulfur ion doping amount. The XPS results show that the introduction of sulfur ions leads to a change in metal electron delocalization, which is conducive to the OER procedure. The newly formed metal sulfide can not only improve the conductivity of NiMnFe LDH/NF electrode materials but also enhance the intrinsic catalytic activity of the materials. The electrochemical performance indicated that the S2-NiMnFe LDH/NF catalyst required only 205 mV overpotential to provide a current density of 10 mA−2, and the Tafel slope was only 45.79 mV dec−1. In addition, the large turnover frequency value (1.2614 S−1) reflects the excellent intrinsic activity of the novel catalytic material.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Zhong Wang,Xinjia Tan,Chuhan Wang,Guojian Li,Shuang Yuan
Ni/NiO is regarded as an ideal candidate material to replace noble metal catalysts due to its good corrosion resistance and excellent hydrogen evolution activity. However, the poor stability of Ni/NiO catalyst in the process of long-term water electrolysis limits its large-scale application. In this study, a facile hydrothermal method was used to successfully synthesize highly active and stable nanoparticulate Mo–Ni/NiO catalysts. Density functional theory (DFT) shows that Mo doping can optimize the charge transfer of Ni/NiO, reduce the d-band center and accelerate the H* dissociation from the catalyst surface. COMSOL numerical simulation further confirmed that the granular structure can enhance the ion concentration and promote H 2 generation. Electrochemical tests showed that the overpotential of Mo–Ni/NiO was only 45 mV when the current density was 10 mA cm −2 in 1 M KOH solution, which was much lower than 158 mV of Ni/NiO. Furthermore, Mo–Ni/NiO exhibited superior stability when operated at a current density of 10 mA cm −2 for 150 h with a reduction of overpotential of only 2 mV. This work provides a simple method for improving the HER activity of catalysts with Mo doping, which provides a new idea for designing catalysts with high activity, excellent stability and low cost.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Yuwei Liu,Jingbo Jia,Hongli Zheng,Changfu You,Haiming Wang
Ni-based catalysts derived from Ni-Al-Y layered double hydroxides with various amounts of yttrium were synthesized by a condensation reflux method. At the optimized Al/Y atomic ratio of 24/1, the obtained H-Ni 75 Al 24 Y 1 sample showed the highest CO 2 methanation performance. At a WHSV of 15,000 mL h -1 g -1 and a pressure of 0.1 MPa, the CO 2 conversion reached 84.1% with 100% selectivity to CH 4 at 250°C, which was much higher than that of H-Ni 75 Al 25 (75.7%) prepared by the hydrothermal method. Furthermore, the CO 2 conversion over H-Ni 75 Al 24 Y 1 sample rose to 88.7% at 300°C, which exceeded that of the Y-free counterpart (84.1%). The introduction of Y altered the amount and distribution of basic sites as revealed by CO 2 -TPD and led to smaller size and higher dispersion of Ni as proved by XRD, TEM and XPS. The H 2 -TPR result verified stronger metal-support interaction but higher amount of reducible Ni weakly interacted with the support in Ni 75 Al 24 Y 1 LDH sample compared with the Y-free counterpart. As a result, the dissociation of H 2 over Ni sites and subsequent hydrogenation became faster based on the in situ DRIFTS results. Dual pathways were proposed to illustrate the reaction mechanism of CO 2 methanation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
·
IF 3.9
Zhuhao Li,Fei Yuan,Tianyun Cui,Changhai Liang,Chuang Li
At present, most of the catalysts used for heterogeneous hydrogenation of nitrile butadiene rubber (NBR) are noble metal catalysts, which require high metal loading but low metal utilization and face challenges in recovery, leading to significant resource waste. The steric hindrance imposed by the large polymer molecules renders the hydrogenation of unsaturated C═C bonds in the backbone particularly challenging, and the degree of hydrogenation is low. In this experiment, Pd–Ni bimetallic nanocatalyst was prepared by co-impregnation method. The catalyst has uniformly distributed catalytic site and high selectivity for C═C bond hydrogenation and achieved a hydrogenation degree of 96% under optimized reaction conditions. The electronic state of Pd is modulated by Ni, enhancing hydrogen activation and catalytic activity. This study provides a novel strategy for developing NBR hydrogenation catalysts, which is significant for the large-scale production of high-value-added HNBR.
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AICHE JOURNAL
·
2025
·
IF 4
Haichao Zhou,Jianglin Liu,Dalang Chen,Yanlin Qin,Tiejun Wang,Xueqing Qiu,Xuliang Lin
The electrochemical conversion of glycerol into dihydroxyacetone (DHA) under mild conditions efficiently addresses glycerol surplus, enhancing its economic value. However, DHA production efficiency remains constrained by steric hindrance from secondary hydroxyl groups and sluggish glycerol electro-oxidation reaction (GOR) kinetics in weakly alkaline conditions. Herein, lignin-derived carbon-supported MnO–Ni heterojunction catalyst (MnO–Ni/C) is synthesized via self-assembly precipitation and in situ pyrolysis. The optimized MnO–Ni/C catalyst requires a low potential of 1.58 V to achieve 10 mA cm −2 , 270 mV lower than the oxygen evolution reaction (OER). It attains a 53.37% DHA selectivity with a high production rate of 864.75 mmol m −2 h −1 at 1.8 V. MnO–Ni/C heterostructures modulate the local electronic structure of Ni sites, optimizing glycerol adsorption configuration and enhancing selective adsorption of secondary hydroxyl groups and oxygen active species near the electrode surface. These synergistic effects significantly improve GOR kinetics and DHA production efficiency.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yaxin Zhang,Tongshuai Wang,Jiawen Tang,Yunsong Li,Yuxiang Guo,Lu Cheng,Jiacheng Liu,Ahu Shao,Chunwei Li,Zhiqiao Wang,Xiaoyu Tang,Yisheng Hu,Yue Ma
The paradigm shift toward the disposal of retired batteries demands sustainable and cost-effective recycling methods that surpass conventional pyro-/hydrometallurgy-based techniques, offering superior profitability, energy efficiency, resource utilization, and environmental benefits. In this study, a one-step modulation approach is presented for regenerating spent Ni-rich layered oxides featured with exceptional ion diffusivity and high-temperature stability. By exploiting decomposed species from Li 6 Zr 2 O 7 , monitored via high-temperature X-ray diffraction, the strategy simultaneously enables: Li source replenishment, Zr doping into the bulk lattice, and Conformal ion-conductive Li 2 ZrO 3 coating on regenerated LiNi 0.8 Co 0.1 Mn 0.1 O 2 (R-NCM811-2%LZO). Crucially, the upcycling process strategically utilizes lattice vacancies in the oxide to facilitate Zr dopant diffusion, while Li 2 ZrO 3 coating elevates corrosion resistance and thermal stability. Operando phase tracking reveals that the regenerated cathode maintains reversible lattice breathing and undergoes a continuous, kinetics-boosted phase transition. By pairing R-NCM811-2%LZO cathode with graphite anode in a 3.0 Ah pouch-format cell, the prototype achieves an energy density of 302 Wh kg −1 , extreme power output of 1260 W kg −1 , 63% mitigation of self-discharge rate at 55 °C, as well as robust cycling across a wide temperature range. This value-added strategy upgrades spent NCM811 into high-temperature-tolerant, fast-charging cathodes, paving the way for sustainable battery recycling and circular economy initiatives.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Adekunle Adedapo Obisanya,Liang Ma,Jinkang Liu,Tianshuo Yang,Zhibin Ren,Xinyi Tan,Faming Gao,Jianren Wang
Prussian blue analogues (PBAs) are a class of promising materials for capacitive deionization. However, the kinetic mismatch between their slow ion storage rate and the demand from short-time desalination severely limits their desalination performance. Here, a group of structure-tuneable Ni-Mn PBAs have been developed by a combination strategy of surface-protected chemical etching and Ostwald ripening to study their ion storage kinetics. Treating them as demos, the characterizations and investigations, e.g., in situ XRD in a three-electrode system, dynamic impedance, finite element simulation, and DFT calculations etc., reveal that the slow ion diffusion caused by the severe agglomeration of the nanoparticles and the unsuitable lattice parameter controls the final desalination behavior. Therefore, the correspondingly optimized sample (HC-t) possessing a microscale hollow structure, nanoscale shell thickness, and expanded lattice, displays a fast ion storage kinetics with the ratio of surface-controlled current as high as 82% at a scan rate of 20 mV s −1 . Consequently, it delivers an impressive desalination capacity of 120.8 mg g −1 (2.06 mmol g −1 Na + ) with a fast average desalination rate of 0.25 mg g −1 s −1 (0.004 mmol g −1 s −1 ) at 1.2 V, competitive with those reported in the literature. Moreover, the elucidation of the structure-performance correlation provides valuable insights for the development and design of next-generation PBAs for capacitive deionization (CDI).
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