JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Kexin Zheng,Xiaochun Gao,Yuhan Xie,Ziyang He,Yujiao Ma,Shaoqi Hou,Dawei Su,Xiaoguang Ma
Understanding of the structure and interfacial merits that reactive metal–organic frameworks (MOFs) undergo is critical for constructing efficient catalysts for non-thermal plasma-assisted conversion of greenhouse gases. Herein, we proposed a free-standing bimetallic (Co/Ni) MOFs supported on bacterial cellulose (BC) foams (Co/Ni-MOF@BC) toward the coaxial dielectric barrier discharge (DBD) plasma-catalytic system, of which the Co/Ni ions coordination demonstrated an intriguing textual uplifting of the malleable BC nanofiber network with abundant pores up to micrometer-scale, which could impart a more intensive predominant filamentary microdischarge current to 180 mA with stronger plasma-catalytic interaction. Remarkably, compared to the monometallic MOF@BC foams, this bimetallic Co/Ni-MOF@BC also delivered a substantially improved alkaline absorption ability as further confirmed by the CO 2 - temperature-programmed desorption (TPD) result. Benefiting from its 3D superiority and synergy of Co/Ni dual-regulation, the Co/Ni-MOF@BC, therefore, displayed the highest CO 2 and CH 4 conversion rates to 52.31 % and 71.50 %, which was above 1.5 and 1.3 times higher than those of monometallic counterparts and Co/Ni-MOF powder. Additionally, its robust cycling performance has also been evidenced by the excellent long-time DRM performance, unchanged crystallinity, morphology, and surface chemical states. By taking both the catalyst existing form and interfacial optimization of MOFs into consideration for designing a unique DRM catalyst, we believed this free-standing 3D Co/Ni-MOF@BC foams could inspire more research outputs on the design of functional catalysts with abundant pores and alkaline absorption sites to accelerate the redox kinetics of CO 2 /CH 4 conversion.
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Journal of Materials Chemistry A
·
2024
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IF 10.7
You Xu,Zhengyun Wang,Xianbao Wang,Zhenzhen Guo,Muhammad Sultan Irshad,Naila Arshad,Jiang Gong,Hongfang Liu,Guangfang Li
Harvesting solar energy for efficient photothermal conversion and steam generation over solar evaporators is particularly significant in the context of comprehensive solar utilization toward solving the global shortage of fresh water. Herein, a flexible Ni-based metal–organic framework composite (NMC) with hierarchical structures is constructed as a photothermal material for solar steam-generation devices. Besides, a phase change material (PCM)-based thermal storage pack is incorporated into the solar evaporator to overcome the solar radiation intermittency. By virtue of the synergistic effect of the promising 3D structure and excellent water transport, the NMC-PCM evaporator possesses an outstanding evaporation performance (2.55 kg m−2 h−1) under 1 sun irradiation. More strikingly, owing to the enhanced light-to-heat performance as well as large heat storage capacity, the proposed evaporator achieves a high water-evaporation rate of 1.46 kg m−2 h−1 without sunlight irradiation. This work opens up opportunities to realize excellent energy capture for solar-driven clean water production and solar thermal storage not only under sunlight incidence but also in no light environment.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Qinghao Xiong,Shouhui Chen,Longsheng Pei,Jianming Liu,Yinan Yang,Meilin Lu,Yonghai Song
Covalent-organic frameworks (COF) and metal–organic frameworks (MOF) were promising precursors for porous carbon-based materials. Calcining individual COF or MOF is usually unfavorable when preparing electrochemical active materials that combine sensitivity, stability, and selectivity. In this work, calcining a core–shell structural Ni-MOF@COF TAPB-DVA prepared a yolk-shell structural composite (YS-Ni@NC), in which the N-doped carbon shell (NC) encapsulated the Ni nanoparticles yolk (NiNPs). A highly selective dopamine electrochemical sensor (YS-Ni@NC/GCE) was developed based on the YS-Ni@NC modified glassy carbon electrode (GCE). The NiNPs yolk in the derivates provided excellent electrocatalytic activity, and the N-doped carbon shell improved the composite conductivity, enhanced the structural stability, and reduced the nonspecific adsorption of uric acid and ascorbic acid through electrostatic repulsion force. The YS-Ni@NC/GCE electrode exhibited higher selectivity for dopamine than the control electrodes in the presence of uric acid and ascorbic acid due to the electrostatic interaction between YS-Ni@NC and the small molecules. At the optimal experimental conditions, the DA sensor showed a linear concentration range of 0.136∼70.0 μM with a detection limit of 0.041 μM. In addition, the electrochemical performance of the sensor was stable when stored at room temperature for 30 days. Preparation of the yolk-shell structural MOF@COF derivates provided a new approach for fabricating highly selective non-enzymatic dopamine electrochemical sensors.
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Catalysts
·
2024
·Vol. 14
·期 7
·394
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IF 3.8
Yingjun Ma,Jie Wang,Hangning Liu,Lin Wang,Changhui Sun,Liangyu Gong,Xiaogang Zhang,Jiefang Zhu
Electrochemical water-splitting is widely acknowledged as a renewable strategy for hydrogen production, but it is primarily constrained by the sluggish reaction kinetics of the anode oxygen evolution reaction (OER). In our study, we employ a fast room-temperature corrosion engineering strategy for the construction of a sulfur-doped Ni-Fe layered dihydroxide catalyst (S-NiFe LDH). With the assistance of a sulfur source, microsphere morphology with an ultra-thin lamellar surface cross-arrangement can be rapidly grown on the surface of an iron foam substrate, ensuring a substantial electrochemical interface. The composition of Ni species in the catalysts can be regulated by simply adjusting the amount of Ni2+and reaction time. Functioning as an OER catalyst, the S-NiFe LDH demonstrates high activity and reaction kinetics, featuring a minimal overpotential of 120.0 mV to deliver a current density of 10 mA cm−2, a small Tafel slope of 39.5 mV dec−1and a notable electrical double-layer capacitance (Cdl) of 31.3 mF cm−2. The remarkable electrocatalytic performance can be attributed to its distinctive three-dimensional (3D) structure and sulfur dopants, which effectively regulate the electrochemical interface and electronic structure of NiFe LDH. This work provides valuable insights for expeditious materials design.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
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IF 4.1
Cheng Guo,Xuehai Ren,Changyan Guo,Naeem Akram,Muhammad Saad Mansha,Ali Ahmad,Saman Khawaja,Jide Wang
In this study, the CdS/Ni-MOF74 (CNM) photocatalyst was synthesized via the combination of CdS with the advantageous properties of MOFs. The composites exhibit a wide visible absorption and photo electron-hole separation efficiency, thus giving improved bifunctional properties for H 2 evolution in conjunction with the benzyl alcohol’s oxidation. The results indicate that as synthesized CNM3 catalyst shows excellent efficiency of hydrogen evolution having an evolution rate of 5783 µmol g −1 h −1 , and the amount of benzaldehyde generated after benzyl alcohol’s oxidation reached 8059.8 µmol g −1 . After four cycles, the H 2 evolution efficiency remained at 5351 µmol g −1 h −1 . According to experiments using radical trapping and mechanistic investigations, it was revealed that the photogenerated holes (h + ) were the key species mainly responsible for benzaldehyde production as well as H 2 evolution. This research work could lead to new approaches resulting in simultaneous organic oxidation processes and hydrogen evolution by using MOF-derived hybrid photocatalysts.
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CHEMOSPHERE
·
2024
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IF 8.1
Xinyue Feng,Haolin Shi,Wei Liu,Fangwei Ma,Pan Liu,Jiafeng Wan
This study demonstrated the design and fabrication of flower-like Ni/Mn-MOFs materials, and three-dimensional ultrathin flower-like Ni/Mn/MC microspheres were fabricated by embedding metal or metal oxide nanoparticles into a porous carbon skeleton via high-temperature pyrolysis at 600 °C and used for the electrocatalytic degradation of ceftriaxone sodium. This unique ultrathin porous flower-like structure can expose more active sites, provide rapid ion/electron transfer, and improve electrocatalytic activity. Meanwhile, the excellent electrical conductivity of the carbon skeleton, as well as the rational composition and synergistic effect of the two components, can promote the generation of active radicals (•OH and •O 2 − ) in the reaction system, which accelerates the electrochemical degradation process and improves the electrocatalytic degradation performance. The results showed that the Ni/Mn/MC-5:1 composite prepared when the molar ratio of Ni: Mn was 5:1 exhibited the best electrocatalytic degradation performance for the degradation of sodium ceftriaxone. The composites showed 98.2% degradation of ceftriaxone sodium in 120 min and maintained sound degradation after 20 cycles. Therefore, we concluded that this novel multicomponent composite has good electrocatalytic activity and stability for the degradation of antibiotic wastewater.
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ChemSusChem
·
2024
·
IF 7.5
Yue Qin,Qingli Xu,Rong Zhao,Qingfa Wang
Graphical Hybrid NiS/Ni(OH) x catalyst containing abundant heterointerfaces and appropriate oxygen vacancies show excellent oxygen evolution reaction (OER) activity and stability. The oxygen vacancies can be easily regenerated to recover the OER performance after the stability test. A mechanism of oxygen vacancies transformation and regeneration based on the Ni-S-5 catalyst is proposed. Developing low-cost and highly efficient electrocatalysts toward oxygen evolution reaction (OER) is of vital significance for electrochemical water splitting. Herein, we fabricate a heterostructure NiS/Ni(OH) x electrocatalyst (Ni-S-n) with regenerative oxygen vacancies via electro-deposition on nickel foam (NF) followed by a facile NaBH 4 reduction. The resulting Ni-S-5 catalyst with appropriate amount of oxygen vacancies (O vs ) exhibits extraordinary activity for alkaline OER with overpotential of 142 mV and 248 mV to reach the current density of 10 mA cm −2 and 100 mA cm −2 , respectively. This catalyst also shows remarkable durability with 40 h. After the stability test, the excellent OER performance is well recovered by regenerating the surface oxygen vacancies (O vs ) significantly with additional NaBH 4 reduction. The Ni-S-5 catalyst still displays good activity even after repeating it three times (180 h). The surface oxygen vacancies act as vital active sites for OER. A mechanism of O vs species transformation and regeneration based on the Ni-S-5 catalyst is proposed, which provides a new direction for exploring ultrastable and efficient OER electrocatalysts with renewable active species.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Di-Ming Chen,Han-Dong Qiao,Pei-Feng Wang,Zi-Jun Zhao,Shao-Ming Fang
In this study, a porous Ni-MOF formulated as {(H 2 NMe 2 )[Ni 3 (μ 3 OH)(TPT)(TZB) 3 ](H 2 O) 6 (DMA) 7 } n (TZB = 4-(1H-tetrazol-5-yl)benzoate, TPT = 2,4,6-tri(4-pyridyl)-1,3,5-triazine, and DMA = N,N-dimethylacetamide) was prepared and its C 2 H 2 and CO 2 adsorption performances were systemically studied both experimentally and computationally. The structural analysis by single crystal X-ray diffraction studies reveals that the prepared Ni-MOF crystallizes in the space group P6 3 mc and features a porous pacs -type network composed of trigonal bipyramidal and octahedral cages. The activated Ni-MOF (Ni-MOF-a) shows a high C 2 H 2 uptake capacity of 157 cm 3 /g with a moderate C 2 H 2 /CO 2 IAST selectivity of 3.3 at 298 K and 1 bar. More importantly, Ni-MOF-a shows a low adsorption heat for C 2 H 2 ranging from 24.6 to 27.1 kJ/mol at 298 K with a high separation potential of 2.85 mol/kg. In the computational simulation section, six sets of point charge derived from different approaches (Qeq, Mulliken, PACMOF, mCBAC, Mepoml, PACMAN) and two different force-fields (UFF and Dreiding) were used to calculate the C 2 H 2 and CO 2 adsorption isotherms and then compared with the experimental values. Our results reveal that great care should be taken in the selection of point charges and force fields, and the unsuitable combinations might result in an inappropriate C 2 H 2 /CO 2 selectivity which is against the experimental results.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qingdong Ruan,Jinyuan Liu,Dan Li,Xiaolin Zhang,Liangliang Liu,Chao Huang,Bin Wang,Paul K. Chu
Surface engineering by doping and amorphization is receiving widespread attention from the perspective of the regulation of the electrocatalytic activities of electrocatalysts. However, the effective modulation of active sites on catalysts is still challenging. Herein, a straightforward and efficient method combining hydrothermal treatment with low-temperature plasma processing is presented to synthesize Ni-doped W18O49 nanorod arrays on carbon cloth with abundant oxygen vacancies (CC/WO-Ni-x). Mild plasma doping with Ni modifies the electronic structure of the W18O49 nanorod arrays, resulting in the formation of an amorphous structure that significantly reduces the electron transfer resistance. Additionally, the coupling with high-valent W6+ (derived from W18O49) leads to the partial preoxidation of doped Ni to form active Ni3+ species and oxygen vacancies. These features are collectively responsible for the remarkable oxygen evolution reaction (OER) and urea oxidation reaction (UOR) properties of CC/WO-Ni-4, for example, 10 mA cm–2 current density, an overpotential of 265 mV required for the OER under 1.0 M KOH solution. The addition of 500 mM urea to the 1.0 M KOH solution decreases the overpotential required for the same current density from 265 to 93 mV. This study provides insights into the modification of surface structures and presents an effective strategy to optimize the electrocatalytic active sites and enhance the efficiency of multifunctional electrocatalysts.
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SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhigao Ma,Bingyan Jiang,Dietmar Drummer,Lu Zhang
In micro-injection molding, polymer/mold interface adhesion may cause severe deformation or damage of micro features on the molded products. To reduce the interface adhesion and improve the molding quality of polymer microfluidic chip, Ni-P-PTFE (polytetrafluoroethylene) ternary composite was adopted to electroform mold insert with self-lubricating properties. The influence of phosphorous acid concentration on the composition and performance of Ni-P-PTFE composites was systematically investigated. Our results demonstrated that the content of P and PTFE particles in the composites raised with an increase in phosphorous acid concentration. Elevated phosphorous acid concentration adversely affected the current efficiency and slowed down the deposition rate, allowing sufficient contact time for PTFE to transfer and adsorb onto the electrode surface. The hardness of the deposited nickel increased from 310 HV to 510 HV in the Ni-P-PTFE composites. Furthermore, the Ni-P-PTFE composites demonstrated excellent self-lubricating properties, showcasing friction coefficients of 0.15 and 0.25 during the initial and steady stages, respectively, representing a notable reduction of 66.7 % and 64.3 % compared to pure nickel. This study provides a novel approach to fabricate molds with self-lubricating properties, which contributes to the high-precision injection molding of polymer-based micro devices.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xiaodong Liang,Xin Liu,Peixiong Wang,Zhongxian Guo,Xin Chen,Jia Yao,Jingying Li,Yi Gan,Lin Lv,Li Tao,Hanbin Wang,Houzhao Wan,Jun Zhang,Hao Wang
Manganese-based cathode materials for zinc-ion batteries provide a moderate voltage window and good specific capacity. However, the disproportionation reactions cause manganese to dissolve during the charge and discharge process, seriously affecting its cycle stability. Herein, nickel-doped α phase manganese dioxide (Ni-MnO 2 ) obtained by ion exchange effectively improves the lattice stability and cycle stability of manganese dioxide (MnO 2 ). The introduction of Ni 2+ supports the lattice structure of MnO 2 , reduces structural damage and manganese (Mn) dissolution caused by the Jahn-Teller effect during the cycle, and improves its electronic conduction and ion migration capabilities. It quickly completes the activation process at a current density of 0.1 A g −1 and stably maintains a capacity of 233 mAh g −1 . After 2800 cycles at 1 A g −1 , the capacity retention rate remains 96.3 %. In contrast, MnO 2 without ion exchange modification has dropped to 19.6 % after 130 cycles. This paper demonstrates the feasibility of the ion exchange process, bringing more precise and effective ideas to the research and development of high-performance aqueous zinc-manganese batteries.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xin Liu,Liping Yang,Li Chen,Shuxia Li,Peng Li,Yongrong Sun,Ning Kang,Chenglong Wang
It is still challenged to propose a straightforward and in-situ growth method of fabricating perovskite-type metal oxide films with dense and uniform surface coverage. This paper presents a simple strategy to prepare LaBO 3 (where B = Ni, Co, Fe, Mn) films by metal oleate (MO) route, in which metal oleates (La(OA) 3 and (B(OA) x , x = 2 or 3) serve as effective ligands to inhibit the self-aggregation among crystal grains. The as-prepared LaNiO 3 film with uniform and dense surface shows a reduced contact angle (31.5° vs 51.2°) and surface roughness (Ra = 14.2 vs 23.9 nm) compared with film prepared by Sol-gel (SG) method. Finally, the LaNiO 3 film by MO route is successfully employed as hole transport layer (HTL) in perovskite solar cells (PSCs) to obtain a power conversion efficiency (PCE) up to 15.62 %, which is 1.54 times that of PSCs by SG method. This work opens an avenue for fabricating LaBO 3 films with dense and uniform surface coverage by MO route.
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