NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 22
·10133-10141
·
IF 2.7
Rong Tu,Jiangwei Liu,Yingqiu Zheng,Chao Song,Chitengfei Zhang,Yuzhe Han,Rongchen Xu,Guoqiang Luo,Song Zhang,Takashi Goto
NiO-based materials hold great promise as oxygen evolution reaction (OER) catalysts owing to their high intrinsic OER activity and good chemical stability. Herein, Ni/NiO/C hollow microspheres with high activity were successfully fabricated through a facile one-step mist chemical vapor deposition (mist-CVD) process using ethanolamine and nickel chloride as precursors. The high-temperature pyrolysis of the organic precursor yields a significant quantity of gas, leading to a rapid increase in pressure within the droplet, which prompts the nanoparticles to aggregate on the surface of the droplet and form a hollow structure. The crystal phase and morphology of the samples can be modulated through optimizing the decomposition temperature, and particularly, Ni/NiO/C porous hollow microspheres synthesized at 600 °C (Ni-600) presented the best OER activity, exhibiting an overpotential at 10 mA cm−2 (η10) of 286.4 mV and a Tafel slope of 54.8 mV dec−1. The outstanding OER electrocatalytic performance of Ni/NiO/C hollow microspheres is ascribed to the improved electronic conductivity facilitated by the existence of metallic Ni and amorphous C, coupled with the relatively large specific surface area derived from the unique hollow structure.
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Small
·
2025
·
IF 12.1
Pengwei Tan,Shuyang Shen,Ying Zheng,Yushu Tang,Yuanyuan Luo,Zheng Zhang,Dong Men,Guotao Duan
Electrochemical transistor (ECT) biosensors can achieve ultrahigh sensitivity, while keeping challenges for large biomolecules due to their sizes over the thickness of the electric double layer (EDL) causing a failure of sensing reaction. Here, wafer-level Ni/Fe-metal-organic framework (MOF) films and corresponding ECT biosensors are fabricated for the detection of coronavirus nucleocapsid protein, which realize an ultralow detection limit of 1 fg mL −1 and a wide detection range of 1 fg mL −1 to 100 pg mL −1 . A 3D Debye space, originating from the unique stacking structure of nanosheets and nanoparticles in Ni/Fe-MOF film, is proposed to explain such ultrahigh sensitivity, which ensures the immune-binding and sensing process of the nucleocapsid protein large molecules located in the effective EDL space. Moreover, an appropriate Ni/Fe molar ratio is optimized to enhance the transmission of carriers, thus improving the signal-to-noise ratio and the sensing response. The Ni/Fe-MOF-ECT biosensors will find applications in highly sensitive detection for large biomolecules, and the 3D Debye space may be a design model for constructing other biosensors.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuan Bao,Weijia Pu,Yiwei Zhang,Yahui Xiao,Yong Liu
Ni-Co nano-alloys confined by in-situ formed N-doped porous carbon overlayer have been prepared through chelation of metal cations with citric acid and urea followed by carbonization for hydrodeoxygenation of 5-hydroxymethylfurfural (HMF) into 2, 5-dimethylfuran (DMF). The results indicated that the Ni-Co nano-alloys were formed and homogeneously distributed within the N-doped porous carbon overlayer. The electronic effect of the Ni-Co nano-alloys significantly boosted hydrodeoxygenation activity of the Co 2 Ni 1 @NC catalyst and simultaneously inhibited further hydrogenation and opening of furan ring. The N-doped porous carbon overlayer around Ni-Co nano-alloys not only facilitated to disperse and stable Ni-Co nano-alloys through strong metal-support interaction, but also protected the Ni-Co nano-alloys from aggregation. Therefore, the Co 2 Ni 1 @NC catalyst offered superior catalytic performance with the HMF conversion of 100 % and DMF selectivity of 93.0 %. Moreover, the Co 2 Ni 1 @NC catalyst displayed excellent stability without significant activity loss after five recycles due to the spatial confinement of N-doped carbon overlayer.
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Small
·
2024
·
IF 13
Zhipeng Liu,Jinling Xue,Yibin Fan,Yinshi Li
Rational design of efficient and non-noble metal bifunctional catalysts for alkaline overall water splitting (OWS) electrochemical reactions is of top priority in the development of hydrogen-based energy. Constructing catalysts with unique structures to optimize the intrinsic activity is a promising strategy. In this work, a newly developed Ni 3 Co 3 Mo 100 -BTC-15h catalyst consisting of Ni nanoparticles enriched on the surface along with a core-shell porous structure is prepared via a hydrothermal process. Due to the unique composition and Ni-enriched core–shell structure, the Ni 3 Co 3 Mo 100 -BTC-15h catalyst exhibits enhanced electrocatalytic properties for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media. Under the dual tuning and intermetallic phase, the Ni 3 Co 3 Mo 100 -BTC-15h catalyst deliver a lower overpotential of 151 mV and ≈ 136 mV exceeding commercial catalysts for OER and HER. When the Ni 3 Co 3 Mo 100 -BTC-15h is used as bifunctional catalyst for OWS in a two-electrode alkaline electrolyzer, a cell voltage of 1.62 V is required to drive 10 mA·cm −2 comparable to that of commercial Pt/C and RuO 2 catalysts. This work proposes a potential strategy for optimizing the electrocatalytic performance of non-noble metal catalysts for OWS.
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FUEL
·
2024
·
IF 6.7
Cheng Wang,Fengsheng Zhan,Shan Wang,Yi Wei,Jianbing Ji
Methane pyrolysis is a promising sustainable technology for CO 2 -free hydrogen production. However, the development of stable methods for methane pyrolysis to produce hydrogen at lower temperatures has presented significant challenges. This study presents a reaction system that combines molten carbonate with Ni/Al 2 O 3 catalyst and investigates methane pyrolysis using this system in a bubble-cap reactor. Remarkably, this system exhibited a low activation energy of 145.8 kJ per mole, enabling the achievement of a methane conversion of 92.5 % at 580 °C by employing a double-layer bubble cap tray configuration. Furthermore, the system showcases sustained activity for a duration of up to 72 h.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wenqian Zhang,Shengming Zhang,Minghao He,Weixian Hu,Wenhao Han,Kangkang Zha,Qian Feng,Guohui Liu,Yanli Zhao,Bobin Mi
Postmenopausal bone loss due to estrogen deficiency necessitates effective therapeutic strategies. Our study explores targeting macrophage Aurora A kinase to mitigate bone loss. Aurora A kinase phosphorylation is observed being increased in bone marrow-derived macrophages (BMDMs) from ovariectomy (OVX) mice, along with a reduction in programmed death-ligand 1 (PD-L1) expression. Detailed analysis reveals that PD-L1 plays an immunomodulatory role by lowering the ratio of T helper 17 cells and regulatory T cells. The metabolic shift toward glycolysis through transcriptome sequencing, induced by Aurora A kinase inhibition, is essential for PD-L1 expression in BMDMs. The interaction between Aurora A kinase and cytochrome C oxidase subunit 5B is found to enhance PD-L1 expression. To apply these findings therapeutically, a multifunctional system is developed using a Nickel-metal organic framework combined with bisphosphonate and MLN8237 (BP@Ni-MOF/MLN8237). This system targets bone tissues through bisphosphonate and effectively delivers MLN8237 to macrophages, promoting PD-L1 expression for a favorable immune environment. Moreover, this system exhibits an obvious angiogenic effect. The present study highlights the crucial roles of macrophage Aurora A kinase and PD-L1 in maintaining bone homeostasis as well as the angiogenesis effect by Ni-MOF engineered system, presenting a promising therapeutic approach to prevent postmenopausal bone loss.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wangchang Geng,Pengfei Song,Xinrou Cao,Libing Duan
Metal oxides derived from metal-organic frameworks (MOFs) can maintain the porosity and unique structure of MOFs, giving them significant development potential in the field of gas sensing. In this study, bimetallic Ni/Zr-MOFs solid microspheres were synthesized via the solvothermal method, and NiO/ZrO 2 composites with p-p heterostructure were further prepared through an annealing process. The morphology, structure, specific surface area, and pore size of NiO/ZrO 2 composites were analyzed using a series of characterization techniques. The gas sensing performance study showed that the NiO/ZrO 2 -2 sensor exhibited higher response (32.3–100 ppm), lower detection limit (7.2 ppb), shorter response/recovery time (55 s/83 s), and excellent repeatability to triethylamine gas at the operating temperature of 240 ℃. Additionally, within a specific range (1–200 ppm), a strong linear relationship was observed between the response value and the gas concentration for the NiO/ZrO 2 -2 sensor (R 2 =0.9588). This study is expected to provide a valuable reference for designing high-performance triethylamine sensors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yaohao Zhang,Kaifen Luo,Lijuan Peng,Jiahuan Zhong,Chengkai Zhang,Dingsheng Yuan
Compared to a single heterostructure , constructing multiple heterojunction interfaces to enhance bifunctional catalytic activity still faces challenges. Herein, a nanoflower-like electrocatalyst with multiple heterojunction interfaces, which consists of MoO 3 , V 2 O 5 , and Ni(OH) 2 in-situ grown on nickel foam, is prepared through a one-step hydrothermal method (MoO 3 /V 2 O 5 /Ni(OH) 2 /NF, named MVN/NF). The MVN/NF exhibits superior catalytic performance, attributable to enhanced electron transfer facilitated by numerous heterojunction interfaces, a substantial active specific surface area , and a self-supported architecture. It requires low potentials for hydrogen evolution reaction , urea oxidation reaction , and overall urea electrolysis of 81 mV, 1.351 V, and 1.450 V (vs. RHE), respectively, to reach a current density of 10 mA cm −2 . By cutting the material into a large-scale electrode for use in an alkaline electrolyzer , its Faraday efficiency was 90.0%, and the urea decomposition rate reached 45.1%. This work offers broad application prospects for the realization of large-scale hydrogen production and the decomposition of urea-containing wastewater.
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WASTE MANAGEMENT
·
2024
·
IF 7.1
Jing Gao,Wenchao Lu,Yujiang Li,Tao Wu
This article employs six organic acids to selectively dissolve Mo, Ni and V from spent catalysts, and the most effective acid is identified. Then, the effects of key leaching parameters, including acid concentration, temperature, and S/L ratio, on metal leaching are systematically explored to determine the leaching mechanism. The results demonstrate that the leaching ability of organic acids followed the order: oxalic acid > citric acid > tartaric acid > malonic acid > acetic acid > formic acid. The leaching process of metals was jointly influenced by acidolysis and complexolysis. Among them, more than 93.07 % of Mo, 86.64 % of V, and 74.21 % of Ni were selectively leached with oxalic acid at the optimum condition: S/l: 1/20, oxalic acid: 1.0 mol/L, temp: 60 °C. From the correlation coefficients, the resulting activation energies, and n values, it was demonstrated that Mo and V followed the Avrami dissolution reaction model, V leaching was controlled by the diffusion mode, and Mo leaching was controlled by a mixed mode of chemical reaction and diffusion. The dissolution behavior of both metals consistently adhered to the linear trend of the Avrami kinetic model under varying S/L ratios and oxalic acid concentrations.
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Energy Advances
·
2024
·Vol. 3
·期 5
·1111-1120
·
IF 3.2
Pengwei Liu,Shouyan Sun,Tongfei Wang,Xiaojuan Shen,Maiyong Zhu
Considering its integration with other electronics, three-dimensional (3D) silicon with a large surface area is an attractive electrode substrate for supercapacitors (SCs). However, the poor silicon surface stability as well as the corresponding complicated and expensive protective fabrication process impede the practical applications of silicon-based SCs. In this work, a novel electrode was developed with a simple and facile solution method, where electrodeposited Ni particles served as the current collector layer (CC-layer) and the composite of poly(3,4-ethylenedioxythiophene) (PEDOT) and manganese dioxide (MnOx) prepared via the one-step co-electrodeposition method worked as active materials. The compact layer generated from Ni particles and PM was tightly wrapped around SiNWs, protecting the silicon surface from oxidation/corrosion. The deposition time of the Ni particles and PM was investigated. To further improve the electrochemical performance of the electrode, Pt nanoparticles (NPs) were introduced into the PM layer. The NP introduction not only enhanced the conductivity of the electrode but also made the surface become more hydrophilic, favoring the ion/charge transport. Benefiting from the large surface areas of SiNWs, the high conductivity of the CC-layer generated from the Ni particles, the high-capacity of PM and the hydrophilic surface resulting from Pt decoration, the synthesized NSi@PM–Pt electrode demonstrates a high areal specific capacitance of 207.43 mF cm−2 at 1 mA cm−2. The symmetric device delivers a maximum energy density of 0.006 mW cm−2 with a good stability retention up to 94.6% over 5000 cycles. The results afford a promising solution strategy to prepare high-performance silicon-based SCs with a simple, facile and cost-effective method.
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MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Xinhong Qi,Zhijun Yan,Yang Liu,Xiangcun Li,Gaohong He,Sridhar Komarneni
Ni and Co doped Fe 2 O 3 hollow microspheres of yolk-shell type were designed and synthesized by using resin (RF-COOH) microspheres as hard template and subsequent calcination . Specific morphologies (walnut-like, jingle-bell-like and ball-like) and compositions of Fe 2 O 3 with different amounts of Ni and Co doping were obtained by tuning metal precursor concentration to optimize their performance in lithium-ion battery application. When Ni and Co doped Fe 2 O 3 hollow microspheres were used as anode materials for lithium-ion batteries, jingle-bell-like and ball-like morphologies showed better electrochemical performance with specific capacities of 415.7 and 414.1 mA h/g, respectively up to 200 cycles due to their stable construction with hollow cavity, porous shell and Ni and Co dopants . However, the specific capacity of Ni and Co doped Fe 2 O 3 @TiO 2 hollow microspheres increased to 562 mA h/g. This work showed a new avenue for designing and fabricating yolk-shell hollow structures with specific morphologies and compositions in order to optimize their specific capacity for use in lithium-ion batteries.
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POLYHEDRON
·
2018
·
IF 2.067
Dejuan Fa,Mao Zhou,Hui Zhao,Yiwei Jiang,Yuqing Miao
The 3D flower-like Ni–Co–S was synthesized by a typical hydrothermal method in the presence of urea and thioacetamide. As comparison, the urchin-like Ni–Co–O was prepared in the absence of thioacetamide. The former processed higher electrocatalytic activity for methanol oxidation than the latter. Ni–Co–S exhibited the anodic peak current density of 19.23 mA/cm 2 for methanol oxidation, far higher than Ni–Co–O. It also showed the Tafel slopes of 57 mV/dec, much lower than Ni–Co–O. The BET results showed that the surface area and pore volume are 96.373 m 2 /g and 0.367 cm 3 /g for the flower-like Ni–Co–S, which is higher than 88.736 m 2 /g and 0.224 cm 3 /g for the urchin-like Ni–Co–O. As a result, the flower-like Ni–Co–S possessed more electroactive sites for methanol oxidation. The superhydrophobicity of the flower-like Ni–Co–S helps for the formation of micro air film on the surface of flower petals. Such a tri-phase interface of Ni–Co–S solid, reaction solution and air film may help for the electrocatalytic oxidation of Ni–Co–S toward methanol oxidation since the produced CO 2 can leave the surface of Ni–Co–S quickly and enter into solution phase due to the presence of air film and high solubility of CO 2 in aqueous solution.
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