JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 27
·期 5
·1455-1466
·
IF 2.183
Yuan Zhishuai,Cheng Yuchun,Ma Shoutao,Jiang Zhen,Zhou Yisi,Wang Yingjun,Zhang Wei,Suo Yanhua
A new method called Instant Exactness Synthesis (IES), which was applied to prepare SAPO-11 molecular sieve, was introduced innovatively. The metal–acid bifunctional Ni/SAPO-11-IES catalyst with a Ni content of 4% was prepared by the impregnation method. Ni/SAPO-11-H catalyst was prepared as a comparative sample through the traditional hydrothermal method. In addition, the growth mechanism was used to explain the excellent performance of catalyst prepared by IES method in detail. The structure of Ni/SAPO-11-IES was confirmed via XRD and TEM characterization. The pore structure of the molecular sieve was determined by nitrogen adsorption and desorption. 29 Si MAS NMR measurement was used to illustrate multiple silicon environment which supported the excellent acidity in NH 3 -TPD measurement. Furthermore, the favourable dispersibility of Ni species was proved by the mapping of the elements and EDS. Benefiting from the superior performance of materials, Ni/SAPO-11-IES catalyst exhibited a higher catalytic performance for n-heptane hydroisomerization with n-heptane conversion of 82% and isoheptane selectivity of 86%, respectively, compared with other catalysts in the same system. The study also provides new ideas for the preparation of molecular sieve materials.
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ADVANCED MATERIALS
·
2026
·
IF 29.1
Jiage Yu,Wei Liu,Lu Bai,Benqiang Tian,Qingyi Zhu,Qianxi Yang,Linlin Zhou,Haoyang Wu,Yuan Wang,Boyuan Li,Xiangrong Jin,Yun Kuang,Jiazhan Li,Xiaoming Sun
CO 2 electroreduction typically requires large overpotentials to sustain high reaction rates, which at current densities approaching 1 A cm −2 inevitably intensify competition from the hydrogen evolution reaction (HER), making it difficult to simultaneously sustain high product selectivity (>95%). In this study, hollow Ni─NC (H-Ni-NC) was synthesized using nanoscale silica sphere templates and atomic Zn as a sacrificial pore-former within the carbon shell. The optimized H-Ni-NC achieves a current density of −1.0 A cm −2 with over 95% CO Faradaic efficiency in a flow cell. The high performance was attributed to the hollow sphere architecture enriched with gas-permeable through-pores. Notably, the Zn dosage selectively modulates the shell through-porosity, without altering hollow sphere macrostructure or the active-site structure, thereby enabling a systematic investigation of porosity effects. Finite-element simulations provide a qualitative framework suggesting a trade-off between reactant transport and active surface area with increasing porosity in hollow spherical catalysts. This work underscores that engineering of the nanoscale mass-transport environment surrounding active sites plays a critical role in designing high-efficiency electrocatalysts.
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 14
·2443
·
IF 5.1
Xiange Wu,Yuxing Huang,Bo Zhang,Junhao Chen,Jingran Xia,Rui Bai,Wuwan Xiong
The conversion of waste textiles into valuable products is an effective route to mitigate low-value solid waste accumulation and recover energy. In this work, nickel and potassium were introduced into textile waste via an impregnation method, and their roles in microwave-assisted catalytic pyrolysis were investigated with a focus on hydrogen production. The results show that co-loading 1 wt.% Ni and 0.4 wt.% K significantly enhances gas formation, with a total gas yield of 67.47% and a hydrogen yield of 52.57 mmol/g. Hydrogen production was markedly improved compared with the untreated textiles, the physical mixing methods, and the conventional pyrolysis. Structural characterization by XRD and SEM mapping confirmed that K addition effectively suppressed the agglomeration of Ni species. FTIR analysis suggests that a synergistic catalytic effect between K and Ni promotes the conversion of macromolecular components into smaller gaseous products. The improved hydrogen production can be associated with the combined effect of enhanced Ni dispersion and promoted decomposition reactions. This work provides new insights into the design of alkali-promoted Ni catalysts for efficient hydrogen production from textile waste under microwave pyrolysis conditions.
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高影响因子
IONICS
·
2026
·
IF 3.4
M Jayashree,C. V Manjunatha,Venkataramanappa Y.
A novel Co-Ni-ZnO decorated nitrogen-doped graphene oxide (Co-Ni-ZnO/NGO) nanocomposite was synthesized via hydrothermal and co-precipitation methods followed by calcination for sensitive electrochemical nitrite detection. The synthesized nanocomposite was characterized by UV-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). FTIR confirmed the formation of metal-oxygen bonds, while XRD revealed a crystalline structure with an average crystallite size of 25 nm. SEM analysis demonstrated the uniform distribution of Co-Ni-ZnO nanoparticles on NGO sheets with an average particle size of approximately 29 nm, and EDX confirmed the presence of C, O, Co, Ni, and Zn elements. The electrochemical performance of the Co-Ni-ZnO/NGO modified glassy carbon electrode (GCE) was investigated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). The modified electrode exhibited enhanced electrocatalytic activity toward nitrite oxidation due to the synergistic interaction between the trimetal oxide nanoparticles and the conductive NGO matrix. Under optimized conditions, the sensor displayed a linear response range of 1.5–78 µM, a sensitivity of 1.945 µA µM⁻¹ cm⁻², and a low detection limit of 3.87 nM (R² = 0.9918). In addition, the sensor demonstrated excellent selectivity, reproducibility, and stability. Recovery studies in food and environmental samples confirmed its practical applicability. These results suggest that the Co-Ni-ZnO/NGO nanocomposite is a promising electrocatalytic material for reliable nitrite detection in environmental monitoring and food safety applications. Graphical abstract Scheme 1. Schematic illustration of the synthesis of the Co-Ni-ZnO/Nitrogen-Doped Graphene Oxide (Co-Ni-ZnO/NGO) nanocomposite and its proposed electrocatalytic mechanism for electrochemical nitrite detection
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Kai Zhao,Yiwei Yang,Jinze Li,Jiakun Mei,Jie Luo,Jun Li,Yongliang Zhang,Ting Liu,Qing Xu,Min Chen,Jingjing Li
Solid oxide fuel cells (SOFCs) operating on sulfur-containing hydrocarbons suffer from rapid poisoning of conventional Ni-based anodes. Herein, we report a synergistic design integrating a Mo-mediated sacrificial capture mechanism with a hierarchical hybrid-pore microstructure. Mo acts as a preferential thermodynamic trap with a significantly stronger H 2 S adsorption energy (−1.07 eV) than Ni (−0.61 eV), lowering the local sulfur chemical potential to suppress nickel sulfidation. This effect is amplified by the hybrid-pore microstructure, reducing H 2 S concentrations from 120 to 14 ppm. Furthermore, we demonstrate an in-situ regeneration mechanism where sulfidized Mo phases dynamically regenerate, ensuring continuous catalysis. This dual strategy of capture and regenerability yields exceptional resilience in sulfur-laden hydrogen and methanol over 300 h. Stable operation limits are extended by 2.6- and 2.3-fold, respectively, suppressing the degradation rate to 0.4 mV h −1 . This establishes a fundamental pathway for designing robust anodes for direct hydrocarbon SOFCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xiaowen Wang,Jing Bai,Jiaying Chen,Shijie Cao,Quanquan Li,Boyu Zhang,Zhixue Wang,Hexiang Lu,Jianyou Wang,Xuesong Wang,Yunhua Xu
Ni-loaded Ce/Nb oxide catalysts (CeNb-x%Ni) were prepared and ball-milled with MgH 2 under H 2 to investigate the effects of Ni loading on sorption kinetics. The results reveal that the 40%Ni catalyst featured the most balanced behavior. MgH 2 -10%(CeNb-40%Ni) absorbed 5.516 wt% H 2 within 1 min at 350 °C and released approximately 5.6 wt% H 2 within 30 min after hydrogenation. At 150 °C, it still absorbed 3.54 wt% H 2 in 6.5 min and reached 4.921 wt% after 30 min. TPD and DSC curves suggest that the onset and main release temperatures moved to lower values, while kinetic analysis presented a much smaller apparent dehydrogenation barrier. XPS indicates the presence of Mg-H-related species, metallic/interfacial and oxidized Ni species, Ce 3 + /Ce 4+ surface states, and Nb 5+ /Nb δ⁺ -related components. These surface states, together with the refined particles and crack/pore-rich surface produced during milling and cycling, may facilitate hydrogen transfer across the MgH 2 /catalyst interface. Thus, an appropriate Ni amount in a Ce/Nb oxide matrix is important for accelerating MgH 2 absorption and desorption.
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
De Xia,Hao Wang,Ben Li,Bing Lu,Yong Wang,Shanjun Mao
This study presents a novel Rh 7 Ni 1 P 4 /SiO 2 catalyst that significantly improves the hydroformylation of olefins, achieving a turnover frequency of 3433h −1 . By incorporating nickel (Ni) and phosphorus (P) into rhodium (Rh), the electronic structure of Rh was effectively modified, enhancing olefin adsorption and reducing CO binding energy. This dual modulation boosts catalytic performance by shifting the rate-determining step from CO insertion to acyl hydrogenation, thereby accelerating the reaction rate. Experimental results, supported by density functional theory (DFT) calculations, reveal that the Rh 7 Ni 1 P 4 /SiO 2 catalyst reduces Rh-CO interactions, minimizes rhodium leaching, and exhibits excellent stability over multiple cycles. This research advances the design of robust and efficient catalysts for industrial hydroformylation processes.
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Applied Materials Today
·
2026
·
IF 7
Jiesai Ma,Junhua Zhao,Qin Hu,Ruo Wang,Shen Wang,Yangjun Mao,Xiaohong Tao,Hexin Wang,Jiawen Hong,Qingqing Xu,Xiangsheng Xu
Metal-organic frameworks (MOFs) are promising electrochromic materials owing to their rapid response and multicolor switching capabilities. However, their performance in thin-film configurations is often limited by slow switching speeds and insufficient optical contrast. In this study, a conjugated biphenyl-based ligand, 4,4′-dihydroxy-3,3′-biphenyldicarboxylic acid (DHBDC), was employed to synthesize Co/Ni MOF films directly on fluorine-doped tin oxide (FTO) substrates via a one-pot solvothermal method. The introduction of Co 2+ and the Ni/Co molar ratio are identified as decisive factors for steering the mesoscopic architecture, enabling precise tuning from agglomerated particles to a well-aligned nanorod arrays. The film fabricated with an equimolar (1:1) Ni/Co ratio at 150 °C delivers optimal performance, exhibiting a high optical contrast of 84% at 900 nm with rapid coloration/bleaching times of 2.9 s and 7.0 s, respectively, alongside good stability over 1000 cycles. Electrochemical analysis confirms that this optimal morphology yields the highest charge transport kinetics and Li + diffusion coefficient. This work provides a viable strategy and fundamental insights for developing high-performance MOF-based electrochromic materials.
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Solar RRL
·
2026
·Vol. 10
·期 2
·e202500917
·
IF 4.7
Lu Peng,Qiang Li,Siting Shao,Meng Zhang,Hongpeng Jia
The escalating CO 2 concentration and energy demand necessitate efficient CO 2 conversion strategies. Photothermal catalytic CO 2 methanation is a promising strategy, yet its efficiency is hindered by the inherent stability of CO 2 and the rapid recombination of photogenerated charge carriers. Among non-noble metal catalysts, Ni-based catalyst is a promising candidate for CO 2 methanation, with sintering and agglomeration remaining to be addressed. Herein, NiMn/TiO 2 bimetallic catalysts with varying Ni/Mn ratios were synthesized to overcome these issues. Characterization results demonstrate that Mn incorporation enhances CO 2 adsorption capacity by increasing oxygen vacancies and significantly improves the separation efficiency of photogenerated carriers. Furthermore, Mn doping optimizes the electronic structure of the catalyst, narrowing its bandgap for improved light absorption. But the catalytic performance is highly dependent on the Ni/Mn ratio. The synergistic effect of Ni and Mn can be maximized when the Ni/Mn ratio is 1:1, which is specifically manifested as the best catalytic activity. Excessive Mn loading covers active Ni sites and impedes electron transfer, thereby degrading activity. Therefore, this work highlights the importance of Mn as a promoter in designing efficient non-noble metal catalysts for photothermal CO 2 conversion.
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ChemCatChem
·
2026
·Vol. 18
·期 2
·e01717
·
IF 3.9
Yimeng Li,Shiji Guo,Ruchao Yin,Jinlong Huang,Ying Kan,Yufei Lan,Hong Zhang,Hailian Tang,Guoyi Bai
The hydrogenation of dioctyl phthalate (DOP) to dioctyl 1,2-cyclohexanedicarboxylate represents an effective pathway for the production of environmentally friendly plasticizers. However, due to the intrinsic stability of the aromatic ring, the development of efficient and stable non-noble metal catalysts remains a key challenge. In this work, an efficient and stable La-modified MCM-41-supported Ni catalyst (Ni/La-M) was developed. The effects of different La introduction methods on the structural and catalytic properties of the catalyst were systematically investigated. The Ni/La-M catalyst, prepared via a two-step hydrothermal method, achieved 99% DOP conversion under mild conditions (140 °C, 2 MPa H 2 , 1 h) and retained over 90% activity after nine cycles. Characterization results revealed that La incorporation significantly enhanced the interaction between Ni and the support, effectively suppressed Ni particle sintering, and increased the fraction of exposed active sites. Compared with other La-introduction methods, the “La-first, Ni-second” strategy exhibited superior activity retention and cycling stability. This approach provides a new design strategy concept for constructing high-performance non-noble metal catalysts in a controllable manner. Graphical La was introduced during MCM-41 synthesis to build a La-modified support, enhancing Ni–support interaction, dispersing Ni species, and increasing catalyst acidity. This strategy improves catalytic activity for dioctyl phthalate hydrogenation to dioctyl 1,2-cyclohexanedicarboxylate and suppresses Ni sintering and leaching, providing mechanistic insight for designing stable green hydrogenation catalysts.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Wenhui Li,Da Qiu,Junwei Huang,Haoyi Li,Hongna Xing,Xiuhong Zhu,Juan Feng,Yan Zong,Xinghua Li,Xinliang Zheng
The intrinsically low conductivity of CuCo 2 S 4 severely limits its electrochemical performance as an electrode. Herein, we propose an atomic-level doping strategy via a ternary Cu-Co-Ni MOF precursor to precisely incorporate Ni into the CuCo 2 S 4 lattice. First-principle calculations reveal that Ni doping introduces localized electronic states near the Fermi level, effectively narrowing the bandgap and inducing a semiconductor-to-metallic transition. This electronic structure modulation significantly enhances bulk electron mobility and strengthens the adsorption of electrolyte OH - ions. Coupled with the preserved porous carbon framework and multi-metal synergistic interface, the optimized Ni-CuCo 2 S 4 @C electrode achieves a high specific capacitance of 1046 F g -1 at 1 A g -1 . The assembled asymmetric supercapacitor delivers an energy density of 32 Wh kg -1 at 750 W kg -1 , alongside excellent cycling stability. This work elucidates the electronic origin of performance enhancement and provides a doping-guided design principle for high-conductivity metal sulfide electrodes.
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ACS Catalysis
·
2026
·
IF 13.6
Jiajing Kou,Chuntao Han,Bo Yu,Chong Liu,Bo Li,Deng Zhao,Rui Ma
The intrinsic activity-stability trade-off remains a fundamental constraint for metal oxide catalysts in propane dehydrogenation (PDH). Herein, we break this limitation via a well-defined dual-site catalyst comprising ZnO clusters and adjacent Ni single atoms on γ-Al2O3, constructed through a metal-doped carbon dot precursor strategy. This configuration achieves a 5-fold and 2-fold enhancement in propylene formation rate compared to the sole Ni and ZnO catalysts, respectively, while maintaining high propylene selectivity (>93%) and long-term stability over 100 h. Combined kinetic and in situ spectroscopic studies establish a cooperative mechanism wherein under-coordinated Zn2+ sites serve as the primary centers for C−H activation, while neighboring (Ni−)O sites function as dynamic regulators of interfacial hydrogen transfer. Direct evidence from temperature-programmed D2 adsorption and time-resolved propane DRIFTS reveals that the hydrogen transfer rate scales linearly with Ni loading, correlating inversely with the apparent activation energy for dehydrogenation. This (Ni−)O-mediated process dynamically reduces surface hydrogen coverage on ZnO, lowers the energy barrier for C−H cleavage, and concurrently suppresses C−C cracking pathways. This work establishes a design paradigm of using atomically dispersed metals as kinetic regulators of surface hydrogen dynamics, shifting the promoter role from static modifier to active mediator of surface pathways, offering a general strategy for advanced metal oxide catalyst design in alkane dehydrogenation.
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