ELECTROCHIMICA ACTA
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2021
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IF 6.901
Yu Huang,Yihui Wu,Zejie Zhang,Lanlan Yang,Qianhao Zang
Exploring cost-effective and high-efficiency noble-metal free electrocatalysts for oxygen evolution reaction (OER) are of critical importance to the area of renewable energy storage and conversion systems. Herein, Ni–Fe–Mo films were fabricated via electrodeposition method with a very high current density. The film exhibits excellent activity towards OER with a overpotentials of 306 mV at current density of 10 mA·cm −2 and a lower Tafel slope of 77.1 mV·dec −1 under alkaline conditions (30 wt.% KOH). The synergistic effect of the Mo, Ni, and Fe contribute the improved catalytic activity for OER.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Wenzhi Li,Lihong Gao,Zhuang Ma,Yanbo Liu,Fuchi Wang,Jiawei Wang,Lijun Wang,Hezhang Li
Faced with the challenge of high energy ablation problems, especially for laser ablation , effective energy dissipation protective materials fabricate by efficient preparation method is a feasible solution. The Ni-graphite/SiO 2 coatings with different Ni content were prepared by plasma spraying method with optimized plasma spraying parameters. All coatings are pure without oxidation and dense. Their ablation behaviors were investigated by high power continuous wave laser. The results indicate that the Ni-graphite/SiO 2 coating with appropriate Ni content could realize the purpose of energy consumption by endothermal reaction of graphite/SiO 2 and reflection improvement. High Ni content will block the occurrence of endothermal reaction of graphite/SiO 2 and increase the heat diffusion to interior part of coating, which can make the ablation situation of coating more serious.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Xia Ruan,Hong Liu,Xiaoyong Ning,Dongye Zhao,Xianyuan Fan
Zero-valent iron (ZVI), Fe 2+ and H 2 are possible electron donors in the reduction of Cr(VI) by nanoscale ZVI (n-ZVI). However, it is often ambiguous about the roles of these electron donors in the reductive removal of Cr(VI) from groundwater and wastewater. This study investigated the action mechanisms of Fe and Ni in Cr(VI) reduction by Fe/Ni nanoparticles (n-Fe/Ni). Among the three possible reduction mechanisms of ZVI, direct electron transfer from ZVI and its corrosion product, Fe 2+ , were confirmed to be responsible for the reduction removal of Cr(VI). H 2 , another product of ZVI corrosion, was found incapable of reducing Cr(VI). In addition, the secondary metal Ni in n-Fe/Ni was found to facilitate the direct electron transfer from ZVI owing to its ability to inhibit the passivation of ZVI and to enhance the production of Fe 2+ due to the formation of Fe Ni galvanic cells . The results of characterizations on n-Fe/Ni before and after the reaction with Cr(VI) demonstrated that Cr(VI) was reduced to Cr(III), which existed as FeCr 2 O 4 precipitates on the surface of n-Fe/Ni, resulting in effective sequestration of Cr(VI). These findings are important for understanding the main mechanisms of bimetallic nanoparticles or nanomaterials for reductive immobilization of Cr(VI), and may guide further ZVI-based technology development for remediation of contaminated water or soil with redox-active contaminants.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2021
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IF 4.311
Zhongliang Huang,Yujia Yuan,Miaomiao Song,Zhimian Hao,Jingran Xiao,Dongren Cai,Abdul-Rauf Ibrahim,Guowu Zhan
Herein, we fabricated a series of bimetallic Pt-Ni catalysts supported on mesoporous silica nanorods ( m SNR, specific BET surface area of 1802 m 2 g −1 ) to study the effect of Ni/Pt ratio on the product selectivity in CO 2 hydrogenation. Both monometallic Pt/ m SNR and Ni 50 Pt 50 / m SNR catalysts revealed negligible methane selectivity. However, methane became the major product only when increasing the Ni/Pt ratio up to 9. X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma (ICP) characterizations showed that the Pt/Ni ratio on the catalyst surface was appreciably higher than the bulk composition, suggesting the enrichment of Pt on the surface ( e.g. , Pt/Ni of 61/39 for Ni 50 Pt 50 / m SNR catalyst). The Pt/Ni ratio was crucial in determining the CH 4 /CO selectivity, and the addition of a tiny amount of Pt could improve the catalytic performance and stability of Ni/ m SNR. Among the different catalysts, Ni 98 Pt 2 / m SNR showed the best CO 2 conversion (59%) and CH 4 selectivity (96%) at 400 °C, 0.1 MPa, 9600 mL h −1 g cat −1 , and H 2 /CO 2 of 3. In-situ DRIFTS and temperature-programmed surface experiments suggested that the dissociated adsorption of CO 2 on the Pt site led to CO*, but the strongly adsorbed CO* cannot be further hydrogenated to CH 4 over the Pt site. In contrast, CO* could be further hydrogenated into CH 4 via CH x O* intermediates on adjacent Ni sites.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Xiubo Xie,Ming Chen,Peng Liu,Jiaxiang Shang,Tong Liu
The Mg-5.0 wt%Ni-2.3 wt%V nanocomposite has been produced through reducing NiCl 2 with the Mg-V nanoparticles (NPs) prepared by hydrogen plasma metal reaction (HPMR) approach. The in situ formed Ni and V particles of about 15 nm uniformly decorate on the surface of Mg NPs. The Ni NPs transform into Mg 2 Ni while the V NPs remain unchanged after first hydrogen absorption and desorption cycle at 673 K. They show synergistic catalytic effects on the hydrogen storage properties of Mg-Ni-V nanocomposite. The nanocomposite can absorb 4.6 wt% H 2 within 30 min at 473 K and desorb 5.2 wt% H 2 within 10 min at 623 K. The activation energies of hydrogenation/dehydrogenation processes are decreased to 52.8 and 85.1 kJ per mol H 2 , lower than those of the Mg-5.4 wt%Ni nanocomposite of 63.2 and 89.3 kJ per mol H 2 . The enhanced hydrogen storage performances of the Mg-Ni-V nanocomposite are mainly attributed to the synergistic catalytic effects of the Mg 2 Ni and V catalysts, and the nanosize effect of Mg NPs on the decrease of the hydrogen diffusion distance.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Changqing Li,Xu Zhao,Yiwen Liu,Wei Wei,Yuqing Lin
Developing highly active and stable electrocatalysts from earth-abundant elements are imperative for the large-scalable production of hydrogen. Herein, the three dimensional amorphous NiCoS x O y nanosheets arrays directly grow on Ni foam (NiCoS x O y NSs/NF) through a facile one-step electrodeposition is firstly reported. The special in-situ grown 3D nanosheets arrays, largely exposed active sites and enhanced electrical conductivity enable the resultant NiCoS 0.14 O 3.25 NSs/NF to possess remarkable electrocatalytic performance and stability towards water splitting in 1 M KOH. Specifically, the introduction of S ligand into the hydroxides through a straightforward and convenient electrodeposition method boost the robust composition and comprehensive activity of the NiCoS x O y NSs. Such binder-free, easily prepared NiCoS 0.14 O 3.25 NSs/NF electrode requires the overpotential of 250 mV and 170 mV at 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. When functionalizing as two identical cathode and anode in an alkaline electrolyzer, NiCoS 0.14 O 3.25 NSs/NF displays the efficient and robust property on both OER and HER. Remarkably, serving as bifunctional electrode in alkaline electrolyzer, it only needs 1.64 V to reach the current density of 20 mA cm −2 . This study provides a valuable guideline to synthesize non-noble and efficient bifunctional electrocatalysts using a time-saving but facile electrochemical method.
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Journal of Environmental Sciences
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2025
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IF 6.3
Fengyu Li,Ruixing Mao,Lun Feng,Jiaqi Li,Miaomiao Xiao,Langlang Wang,Yixing Ma,Xueqian Wang
This study investigates the application of the Ni 2 La 1 bimetallic basic carbonate catalyst in ozone decomposition, which demonstrates excellent catalytic activity under both low-humidity and high-humidity conditions (90 % relative humidity). The catalyst was synthesized via a co-precipitation method, with the Ni/La molar ratio (Ni:La = 2:1) optimized to enhance its structural and functional properties. This optimization endowed the Ni 2 La 1 catalyst with a more developed layered structure, providing an increased number of surface active sites, which significantly improved its catalytic activity and stability. The results indicate that the Ni 2 La 1 catalyst achieves an ozone decomposition conversion efficiency exceeding 90 % under high-humidity conditions and maintains stable catalytic performance over a continuous operation period of 48 hours. Mechanistic studies further reveal that tribridged hydroxyl groups serve as the primary active sites and play a crucial role in the ozone decomposition reaction. Additionally, the Ni 2 La 1 catalyst exhibits a unique hydroxyl regeneration mechanism, where strong interactions with water molecules facilitate the continuous regeneration of tribridged hydroxyl groups, thereby ensuring stability and sustained catalytic activity in humid environments. This research provides a new pathway for the application of Ni-La bimetallic basic carbonate catalysts in environmental catalysis and green chemical reactions. In particular, it offers robust theoretical support and practical insights for ozone mitigation technologies under high-humidity conditions.
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ACS Applied Materials & Interfaces
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2025
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IF 8.2
Long Li,Yan Wu
This study reports a strategy for constructing highly efficient single-atom photocatalysts through the formation of Ni–N chemical bonds. By anchoring Ni single atoms on nitrogen-doped ZnIn2S4 (N-ZIS), we created a localized charge region that enables directed interfacial charge transfer. The newly formed Ni–N bond plays dual roles of significantly enhancing charge carrier separation and prolonging their lifetime, and serving as an efficient electron transfer pathway from N trap states to Ni active sites. Combined experimental characterization and density functional theory (DFT) calculations confirm the unique stabilizing effect of single Ni atoms in the N-ZIS matrix and elucidate the charge transfer mechanism through Ni–N bridges. The optimized 5%Ni–N30-ZIS photocatalyst exhibits exceptional hydrogen evolution performance, surpassing most previously reported ZIS-based systems. This work highlights the crucial importance of precise control over interfacial chemical bonding at the molecular level for achieving efficient spatial charge separation in inorganic photocatalysts, providing insights for the design of high-performance photocatalytic materials.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Huibin Liu,Xiao Chen,Wenhao Yang,Weilin Shen,Yan Du,Huamin Wang,Wenjun Zhu,Changhai Liang
The semi‑hydrogenation of alkynes to alkenes remains a challenging topic in the purification of polymer monomers. Achieving selective hydrogenation of alkynes requires careful control of alkene adsorption strength on the catalyst surface while avoiding the production of over‑hydrogenated compounds. The reaction is fundamentally influenced by the electronic structure of the metal active sites on the catalyst surface. In this study, Al 2 O 3 -supported Al Ni intermetallic nanoparticles catalysts are synthesized through in situ reduction-doping methods using LiAlH 4 as Al sources. The coordination environment and electronic structure of the active metal Ni are finely tuned while the Al Ni stoichiometric ratio is adjusted. The turnover frequency of AlNi 3 /Al 2 O 3 (16.7 h -1` ) and AlNi/Al 2 O 3 (9.1 h −1 ) are higher than that of the Ni/Al 2 O 3 catalyst (8.6 h −1 ). The optimal AlNi/Al 2 O 3 catalyst with AlNi intermetallic structure exhibits the high styrene selectivity (>90 %) when the phenylacetylene conversion exceeds 99 %. The metal bond between Al and Ni atoms strengthens electronic coupling, resulting in the hybridization of Al p orbital and s orbital with Ni d orbital. The resulting isolated and electron-rich Ni sites (Ni δ- ) are key to achieving high selectivity for styrene. These sites govern the π-adsorption of styrene molecules. Furthermore, the kinetic selectivity advantage of this unique Ni ensemble (AlNi, an intermetallic compound) has been verified. A lower reaction rate and higher activation energy (Ea = 132 kJ·mol −1 ) for hydrogenation of styrene over AlNi/Al 2 O 3 catalyst are observed. Moreover, the high stability of this catalyst and its broad applicability in the hydrogenation of various alkyne compounds provide valuable insights for selective hydrogenation applications of Al-based intermetallic catalysts, enabling the exploration of their properties and applications.
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CHEMISTRY-A EUROPEAN JOURNAL
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2025
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IF 3.7
Jun Shen,Changhui Liang,Yuxin Zhang,Xiaoqiang Zhang,Huixiang Li,Yongxin Li,Songhai Xie,Z. Conrad Zhang
Bioethanol and furanics are currently prevailing additives to fossil-based transportation fuels. With the objective to lift the longstanding limitations of these biofuel additives, this work reports for the first time the synthesis of 2-ethoxy-2-methyltetrahydrofuran (2-EO-2-MTHF) as a co-upgraded fuel by reacting ethanol with 2-methylfuran (2-MF). The formation of 2-EO-2-MTHF is achieved through ethanol ethoxylation of 2-MF, enabled by a reverse Ni(OH) x /Ni catalyst under hydrogen pressure. Nickel hydroxide species over the Ni nanoparticles play a crucial role in activating ethanol and polarizing the partially hydrogenated dihydrofuran intermediates, favorably steering the reaction selectively toward the ethoxylation product. The reaction conditions, including pressure and temperature, are systematically optimized to enhance the yield of 2-EO-2-MTHF, and provide a means to beneficially tune the fuel compositions consisting mainly of 2-EO-2-MTHF and 2-MTHF, both are high energy density molecules. Importantly, the reverse Ni(OH) x -Ni catalyst allows a one-pot process to accomplish consecutive partial hydrogenation of 2-MF and ethanol ethoxylation. This work provides a practical strategy for upgrading biomass-derived polar primary fuel molecules into more versatile fuels and chemicals.
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PubMed
高影响因子
Materials Today Communications
·
2021
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IF 3.383
Xiao-Hui Yang,Kai-Fei Wang,Kuo-Chih Chou,Guo-Hua Zhang
Fine grained WC-Co-Ni cemented carbides with a low binder content have been successful manufactured via the powder metallurgy method. The WC-Co-Ni composite powder with homogeneous distributions of Co and Ni was synthesized by chemical co-precipitation with the raw materials of WC powder, oxalic acid and chlorides of Co and Ni. In this study, the effects of cobalt and nickel contents on the properties of cemented carbides were investigated systematically. The experimental results demonstrated that the alloy prepared by vacuum sintering had uniform grain size distribution and no abnormal growth of WC grains. When the cobalt content was 4 wt% and 5 wt%, the obtained composites almost completely consolidated with excellent hardness and fracture toughness. Among them, for the sample WC-4 wt%Co, the relative density could reach 99.37%, and the Vickers hardness and fracture toughness were 2010 HV 30 and 8.55 MPa·m 1/2 , respectively. When Ni was added to replace part of Co, the relative density of WC-Co-Ni decreased and the fracture toughness was improved without basically sacrificing the hardness. For the sample WC-2 wt%Co-2 wt%Ni, the hardness decreased to 1921 HV 30 , while the fracture toughness increased to 8.97 MPa·m 1/2 .
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高影响因子
ACS Applied Materials & Interfaces
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2017
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IF 7.504
Xin Ning,Yiyuan Lu,Heyun Fu,Haiqin Wan,Zhaoyi Xu,Shourong Zheng
Supported Ni catalysts on three mesoporous SiO2 supports (i.e., SBA-15, MCM-41, and HMS) were prepared using a solid-state reaction between Ni(NO3)2 and organic template-occluded mesoporous SiO2. For comparison, supported Ni catalysts on mesoporous SiO2 synthesized by the conventional impregnation method were also included. The catalysts were characterized by scanning electron microscopy, X-ray diffraction, UV–vis diffuse reflectance spectroscopy, N2 adsorption, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, transmission electron microscopy, and transmission electron microscopy–energy-dispersive X-ray. The catalytic properties of the catalysts were evaluated using gas-phase catalytic hydrodechlorination of 1,2-dichloroethane. The results showed that upon grinding Ni(NO3)2 with template-occluded mesoporous SiO2, strong coordination between Ni2+ and dodecylamine was identified in the Ni(NO3)2–HMS system. Additionally, the results of H2 temperature-programmed reduction revealed that NiO in calcined NiO/HMS was reduced at higher temperature than those in calcined NiO/SBA-15 and NiO/MCM-41, reflecting the presence of a strong interaction between NiO and mesoporous SiO2 in NiO/HMS. Consistently, the average particle sizes of metallic Ni were found to be 2.7, 3.4, and 9.6 nm in H2-reduced Ni/HMS, Ni/SBA-15, and Ni/MCM-41, respectively, indicative of a much higher Ni dispersion in Ni/HMS. For the catalytic hydrodechlorination of 1,2-dichloroethane, Ni/MCM-41 synthesized by the solid-state reaction method exhibited a catalytic activity similar to that prepared by the impregnation method, while higher catalytic activities were observed on Ni/HMS and Ni/SBA-15 than on their counterparts prepared by the impregnation method. Furthermore, a higher conversion was identified on Ni/HMS than on Ni/SBA-15 and Ni/MCM-41, highlighting the importance of template type for the preparation of highly dispersed metal catalysts on mesoporous SiO2.
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