Waste and Biomass Valorization
·
2026
·
IF 3.1
Zhao Kunzhen,Zhang Zhuoma,Hang Xina,Yi LinLin,Li Kaiyuan,Zou Yanyan
Polyether ether ketone (PEEK) is a high-performance thermoplastic with considerable potential for H 2 and syngas productions via pyrolysis. However, its conventional non-catalytic pyrolysis suffers from high energy consumption and low H 2 and syngas yields. This study investigates the catalytic pyrolysis of PEEK using nickel hydroxide (Ni(OH) 2 ) to enhance the gas production efficiency. PEEK mixed with Ni(OH) 2 at different molar ratios (1:0–1:2) was pyrolyzed up to 1073 K under a nitrogen atmosphere. The H 2 yield increased with catalyst loading and reached a maximum of 25.9 mg/g at a PEEK: Ni(OH) 2 ratio of 1:0.5 (13.85 wt%), corresponding to a 264.3% increase compared with non-catalytic pyrolysis. The syngas yield also reached a maximum of 0.75 g/g under the same condition. Thermogravimetric analysis showed that the addition of Ni(OH) 2 significantly lowered the onset decomposition temperature of PEEK from 832 K to 532 K, and transformed its two-stage pyrolysis into a four-stage process with a 10.4% reduction in char residue. In-situ X-ray diffraction revealed that Ni(OH) 2 was progressively transformed into NiO and Ni during heating, indicating the formation of catalytically relevant Ni-containing phases within the pyrolysis temperature range. Scanning electron microscopy showed that the catalyst was distributed within the carbon matrix and altered the morphology of the pyrolysis residue. These observations provide qualitative evidence of morphological changes after catalytic pyrolysis. These findings demonstrate that the catalytic potential of Ni(OH) 2 in facilitating H 2 -rich syngas production from PEEK.
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高影响因子
ChemNanoMat
·
2026
·Vol. 12
·期 4
·e202600011
·
IF 2.6
Yang Zhou,Yajun Xue,Bing Zhou,Gaojie Han,Chuntai Liu,Yuezhan Feng
Ammonia-assisted high-temperature reduction is exploited to create ultrathin (23.7 µm) MXene/reduced graphene oxide/Ni (MXene/rGO/Ni) composite films in which monodisperse metallic Ni nanoparticles are nanosoldered between conductive nanosheets. The single-step protocol simultaneously deoxygenates graphene oxide (GO), restores the MXene basal plane, and reduces Ni 2+ , generating an intact yet flexible layered scaffold with a through-plane electrical conductivity of 3.3 × 10 3 S m −1 and sheet resistance as low as 4.5 Ω sq −1 . The reconstructed heterointerfaces supply abundant dipole polarization centers and magnetic dissipation sites, endowing the film with an X-band electromagnetic interference shielding effectiveness (EMI SE) of 35.1 dB that operates through a synergistic reflection absorption mechanism (reflection coefficient R ≈ 0.9, absorption shielding effectiveness SE A ≈ 24.9 dB). Benefiting from the dense conductive network, the film enables efficient photothermal conversion and delivers linearly tunable photothermal response with excellent cycling stability. Mechanical tensile tests give an ultimate strength of 7.4 MPa, Young's modulus of 0.97 GPa, and toughness of 31.19 KJ m −3 for rMG/Ni-600 films. The aqueous fabrication route and excellent batch-to-batch reproducibility highlight the reliability of MXene/rGO/Ni homogeneous layers as lightweight, multifunctional shields for flexible electronics and high-temperature photothermal-management platforms.
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Catalysts
·
2026
·Vol. 16
·期 7
·583
·
IF 4.5
Mingzi Sun,Wenzhuo Liu,Yun Li,Jilin Cao
Developing high-performance non-precious metal catalysts for the methanol oxidation reaction remains a challenge for direct methanol fuel cells. Herein, a nickel-doped Beta (Ni-Beta) zeolite was successfully synthesized via a template-free one-pot hydrothermal route followed by protonation via ammonium exchange. In this work, the protonation process strengthened metal–support interaction to form Ni2+/Ni3+redox pairs, introduced abundant acidic sites, and optimized the zeolitic pore structure. Optimized Ni-H-Beta-170 (Si/Ni = 170) achieved a remarkable mass activity of 71.6 A g−1at 0.66 V vs. Hg/HgO, around 10-fold higher than unprotonated Ni-Beta zeolite. The improved activity originates from reversible Ni2+/Ni3+cycles for eliminating toxic COads, enriched acid sites accelerating C–H cleavage of methanol and formation of active NiOOH, and enlarged pore volume facilitating mass transfer. This work offers a low-cost strategy toward advanced non-precious methanol oxidation reaction electrocatalysts.
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高影响因子
VACUUM
·
2026
·
IF 4.3
Mier Bai,Han Liu,Zhenyu Li,Yi He,Shijun Xu,Qing Yuan,Yi Sun,Xiangshan Hou
This study employs a low-temperature oxidation self-polymerization method to prepare polyaniline-coated titanium diboride (TiB 2 @PANI) composite materials and co-deposited them with the Ni-W-P system to fabricate a Ni-W-P/TiB 2 @PANI composite coating. This coating's microstructural features, mechanical characteristics, and anti-corrosive properties are systematically investigated. Experimental results demonstrate that the addition of TiB 2 @PANI reduced the average coefficient of friction (COF av ) of the composite coating from 0.560 to 0.232, while the impedance (R t ) represented an approximate 20-fold increase over the pristine Ni-W-P matrix. The SEM and XRD results indicate that TiB 2 @PANI effectively inhibits coating corrosion failure and enhances the improved early-stage corrosion resistance of the coating during a 72 h immersion test in a 0.1 mol/L H 2 SO 4 solution at 40°C.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Jiahui Zhan,Ruihong Dai,Baohuan Wei,Ting Sun,Hu Luo,Shumin Li,Xuan Huang,Haozhi Zhou,Lin Xia,Xiaofang Liu,Shunan Zhang,Shicheng Zhang,Hui Wang,Shurong Wang,Yuhan Sun
Co-modified Ni/SiO 2 produces aviation fuel from polyolefins under mild conditions. • Co doping modulates Ni electronic structure to favor internal C-C bond cleavage. • The yield of liquid reaches 82.3% with 79.0% selectivity to the C 8 -C 16 fraction. • Coupled with green energy, the process reduces carbon footprint by 80%. The escalating accumulation of plastic waste poses a major threat to global sustainability. Converting waste polyolefins into aviation fuel offers a promising valorization route, but the challenge remains in overcoming the limited performance of non-noble metal catalysts. Here, a 10Ni-2Co/SiO 2 catalyst was developed that achieved an excellent balance between activity and selectivity for polyethylene hydrogenolysis. Under mild conditions at 280 °C and 3 MPa H 2 , it delivered an 82.3% liquid yield with 79.0% selectivity toward C 8 -C 16 hydrocarbons. The incorporation of Co induced the coexistence of Ni 0 and Ni δ+ species, which may have facilitated internal C-C bond cleavage along the polyethylene backbone. This synergy may have contributed to hydrogen activation and C-C bond cleavage, which may have promoted a continuous “cleavage-hydrogenation-desorption” sequence, thereby helping to suppress excessive chain scission and favoring the selective formation of aviation-fuel-range hydrocarbons. This catalyst also showed broad applicability to other real-life waste polyolefins, and when powered by renewable energy, the process achieved a significantly reduced carbon footprint, offering a sustainable route for plastic upcycling and aviation decarbonization. Download: Download high-res image (175KB) Download: Download full-size image Co-modified Ni/SiO 2 catalyst enables mild and selective hydrogenolysis of waste polyolefins into aviation fuel (C 8 -C 16 hydrocarbons), achieving the highest yield of 65.1%.
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RARE METALS
·
2026
·Vol. 45
·期 6
·e70378
·
IF 12.1
Tao Wen,Xiaohan Chen,Honglin Hu,Xiteng Yan,Krongthong Kamonsuangkasem,Gang Feng,Rongbin Zhang,Runping Ye,Sibudjing Kawi
en This link goes to a English section zh This link goes to a Chinese section Catalytic NH 3 decomposition has garnered substantial attention for hydrogen transformation and storage. Ni-based catalysts continue to suffer from limited thermal stability and suboptimal low-temperature activity, largely attributed to an incomplete understanding of the structure-activity relationships and reaction mechanisms governing their performance. In this study, we designed and constructed a novel Y-Mg bimetallic oxide support system to synergistically modulate the properties of Ni-based catalysts for NH 3 decomposition. Unlike conventional Ni/MgO or Ni/Y 2 O 3 , the precisely tuned Y/Mg ratio in the 20Ni/YMg 8 catalyst creates a unique interface that couples the structural and electronic advantages of both components. A series of Ni-based catalysts with varying Y/Mg ratios was synthesized, and the 20Ni/YMg 8 catalyst with a 1:8 ratio of Y: Mg achieved a hydrogen production rate of 29.77 mmol g cat −1 min −1 at 600°C. Characterizations revealed that Mg incorporation primarily increased surface area and refined Ni dispersion, whereas Y enhanced reducibility and active metal distribution. More importantly, their synergy optimally tailors the electronic structure of Ni and the distribution of basic sites, which collectively promote *NH 2 formation and accelerate N 2 desorption—the rate-determining step. Mechanistic studies confirmed that the optimized catalyst promoted *NH 2 formation and accelerated N 2 evolution, indicating enhanced NH 2 activation and dehydrogenation. This study presents a rational design approach of bimetallic supports to modulate structural and surface properties, offering valuable insights into the development of efficient and stable Ni-based catalysts for ammonia decomposition. 摘要 en This link goes to a English section zh This link goes to a Chinese section 氨催化分解因其在氢能转化与储存方面的潜力而备受关注。镍基催化剂仍面临热稳定性不足和低温活性欠佳的挑战,这主要归因于对其构效关系及反应机理的认识尚不完善。本研究中,我们设计并构建了一种新型的Y-Mg双金属氧化物载体体系,以协同调控镍基催化剂的氨分解性能。与传统的Ni/MgO或Ni/Y 2 O 3 催化剂不同,20Ni/YMg 8 催化剂中精确调控的Y/Mg比例形成了一种独特的界面,耦合了两种组分的结构优势与电子优势。通过合成一系列不同Y/Mg比例的镍基催化剂,我们发现Y:Mg比例为1:8的20Ni/YMg 8 催化剂在600°C时达到了29.77 mmol g cat −1 min −1 的产氢速率。表征结果显示,Mg的引入主要增加了比表面积并优化了Ni的分散性,而Y则增强了还原性和活性金属分布。更重要的是,二者的协同作用精准调控了Ni的电子结构和碱性位点分布,共同促进了NH 2 的形成并加速了N 2 脱附(速率控制步骤)。机理研究证实,优化后的催化剂促进了 NH 2 的形成并加快了N 2 的生成,表明NH 2 的活化和脱氢过程得到增强。本研究为双金属载体的理性设计以调控结构及表面性质提供了新思路,为开发高效稳定的氨分解镍基催化剂提供了重要见解。
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高影响因子
Molecular Catalysis
·
2026
·
IF 4.3
Zhiqin Li,Tengran Luo,Yuxin Kang,Zegang Qiu,Xin Wang
Ni effectively reduces the surrounding electron density of Co and enriches defects in catalyst. • Ni introduction strengthens adsorption of vanillin and H 2 while facilitates desorption of reaction intermediate. • 4Co-1Ni/NPC achieves complete conversion of vanillin with 100% selectivity towards MMP, outperforming Co/NPC catalyst. • Ni incorporation enhances ability of 4Co-1Ni/NPC to cleave C O bond of intermediate. The development of cost-effective catalysts for the selective hydrodeoxygenation (HDO) of biomass-derived platform molecules is crucial to sustainable biorefining. Herein, a series of Co-Ni bimetallic catalysts supported on N-doped porous carbon were rationally designed via pyrolysis of bimetallic Co-Ni zeolitic imidazolate framework (ZIF) with tunable metal ratios. Comprehensive characterization confirmed that Ni incorporation modulated the electronic structure of Co, promoted metal dispersion, generated abundant defect sites, and enriched the surface concentration of metallic Co 0 and Ni 0 species. The optimal 4Co-1Ni/NPC catalyst exhibited a unique layered architecture, a high surface area, and superior capacity for hydrogen activation. Density functional theory (DFT) calculations revealed that Ni introduction effectively lowered the local electron density of Co, which fundamentally adjusted the adsorption/desorption energetics—strengthening the binding of vanillin and H 2 while facilitating the desorption of the target product 2‑methoxy-4-methylphenol (MMP). Under mild conditions the 4Co-1Ni/NPC catalyst achieved complete vanillin conversion with nearly 100% MMP selectivity, significantly outperforming its monometallic counterparts. Moreover, it demonstrated excellent recyclability over five consecutive runs and broad substrate tolerance toward various lignin-derived aldehydes. The reaction was verified to proceed via 4‑hydroxy‑3‑methoxybenzyl alcohol (HMP), with C–O bond cleavage in HMP identified as the rate-determining step. This work elucidates the synergistic mechanism in Co-Ni bimetallic systems and provides a principled design strategy for developing high-performance, non-noble metal catalysts for selective biomass valorization. Download: Download high-res image (176KB) Download: Download full-size image
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Duo Zhang,Ying-Nan Dou,Rui Gao,Xian-Fa Zhang,Hui Zhao,Xiao-Li Cheng,Shan Gao,Ying-Ming Xu,Li-Hua Huo
Rapid, highly sensitive detection of mustard gas is a critical requirement in public safety and national defense. However, achieving highly sensitive, ppb-level detection of mustard gas under low-power conditions remains a significant challenge. Focusing on the typical blister agent simulant 2-chloroethyl ethyl sulfide (2-CEES), a solvothermal method was employed combined with controlled thermal treatment to fabricate an ultrathin porous NiFe 2 O 4 /NiO nanosheets heterostructure sensor derived from an Fe-Ni-MOF in-situ grown on a ceramic tube in this study. This material possesses uniformly distributed intimate heterogeneous interface, a high specific surface area (95.8 m 2 ·g −1 ), and abundant surface active sites, thereby significantly enhancing its adsorption and catalytic oxidation capability toward 2-CEES. At a low operating temperature of 130 °C, the sensor demonstrates a high response of 41.5 toward 10 ppm 2-CEES, a rapid recovery capability of only 84 s, and a low detection limit of 20 ppb, along with excellent selectivity, humidity resistance, reproducibility, and long-term stability. Through systematic characterization including XPS, in-situ DRIFTS, TPD, and DFT calculations, the multi-step catalytic oxidation pathway of 2-CEES on the composite surface is elucidated, along with the mechanism by which the heterostructure enhances gas-sensing performance via band structure modulation, interfacial charge transfer, and the built-in electric field. This study offers both new materials and novel insights for the development of low-power, highly sensitive sensors for trace detection of chemical warfare agents.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Tiancong Hao,Yuhang Liu,Peili Zhang,Yuhang Xiang,Xiaoning Yang,Qingya Sun,Aming Xie
Magnetic-dielectric synergy is critical to the electromagnetic wave absorption (EWA) performance of carbon/metal absorbers and is closely related to their nanoscale structure. In this work, aromatic dianhydrides with different conjugation lengths (PMDA, NTDA, and PTCDA) were used for ligand engineering of phthalocyanine-derived Ni/C nanocomposites, yielding Ni/C-PMDA, Ni/C-NTDA, and Ni/C-PTCDA. The resulting nanostructural variation regulated carbon ordering, Ni dispersion, and interfacial coupling at the Ni/C heterointerface, thereby redistributing dielectric and magnetic loss behavior. As a result, Ni/C-PMDA shows deep absorption with a reflection loss of −53.30 dB at 2.99 mm, while Ni/C-NTDA achieves a wide effective absorption bandwidth of 6.00 GHz at a thin thickness of 1.92 mm. Moreover, far-field radar cross section simulations on a Ni/C nanocomposite-coated perfect electric conductor (PEC) plate show reduced scattering compared with bare PEC. This work offers a ligand engineering strategy for designing Ni/C nanocomposites with optimized magnetic–dielectric synergy for electromagnetic wave absorption.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xingchen Pan,WenKai Li,Chen Wang,Zhiyong Xie
Owing to the high theoretical energy density, lithium–sulfur batteries (LSBs) have been regarded as a highly competitive technology for next-generation energy storage systems. However, the commercial deployment of LSBs is affected by the diffusional loss of lithium polysulfides (LiPSs) and the inherently slow electrochemical conversion rates. Dual atom catalysts (DACs) have emerged as one of the most promising catalytic materials for LSB by expediting the kinetic conversion of LiPSs and facilitate the formation/decomposition of Li 2 S during the battery cycling process, thereby reducing the migration of LiPSs. In this study, we developed Fe-Ni DACs supported on nitrogen-doped few-layer graphene (FeNi-N-G) as a host for sulfur cathode. Both theoretical calculations and experimental results demonstrate that this few-layer graphene structure provides high conductivity and a porous framework, which significantly improves electron and lithium-ion transport. The dual-functional Fe-Ni–N site serve as strong anchoring centers for polysulfides while simultaneously providing active sites to improve the Li–S redox kinetics. Consequently, the cathode achieves a high initial capacity of 1164.6 mAh g −1 and maintains a capacity retention of 83.1% after 100 cycles at 0.2 C. Such performance underscores its exceptional cycling durability, particularly under high sulfur loading conditions.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Longgong Xia,Zhiqian Yu,Feng He,Yiwang Zhang,Huilan Yang,Kai Ma
(Fe/Zn/Ni)O·(Fe/Al) 2 O 3 spinels are widely used as raw materials for advanced ceramics and refractories and occur as precipitates in slag phases during nonferrous metal pyrometallurgy. The stability and phase-transformation mechanisms of these spinels are important for optimizing material performance and controlling metallurgical processes. The decomposition of Fe 3 O 4 , FeAl 2 O 4 , ZnFe 2 O 4 , ZnAl 2 O 4 , NiFe 2 O 4 , and NiAl 2 O 4 under various atmospheres was experimentally investigated, and phase evolution during reduction was elucidated. Thermogravimetric and differential thermal analyses and reduction experiments showed that Fe(II)-bearing spinels tended to decompose at elevated temperatures in air. ZnFe 2 O 4 and ZnAl 2 O 4 were stable at temperatures up to 1500 °C in air and in an atmosphere with p O2 = 10 −6 atm. At low oxygen partial pressure, aluminate spinels exhibited greater stability. The reduction kinetics of these spinels were also analyzed. The reduction of Fe 3 O 4 , ZnFe 2 O 4 , NiFe 2 O 4 , and NiAl 2 O 4 was described by the Avrami-Erofeev model, indicating that the reduction process was controlled by the nucleation rate. The reduction of ZnAl 2 O 4 was described by a diffusion model.
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高影响因子
CARBON
·
2026
·
IF 12.7
Youming Luo,Yaling Huang,Xuhui Zhang,Mingxuan Tang,Yucan Lei,Wendan Wang,Quanfang Chen
Simultaneously enhancing the mechanical strength and electrical conductivity of aluminum-matrix composites remains challenging because conventional strengthening strategies usually introduce defects and interfaces that intensify electron scattering. In this work, graphene surfaces were coated with Ag or Ni via electroless deposition to regulate the graphene/Al interface through work-function differences. Few-layer graphene was coated with Ag (lower work function than graphene) or Ni (higher work function than graphene) via electroless deposition, dispersed into aluminum powders by ball milling, and consolidated by high-pressure sintering at 1 GPa. The Ni-coated graphene/Al composite achieves an ultimate tensile strength of 336 MPa, corresponding to a 78.7% increase over identically processed pure aluminum. In contrast, the Ag-coated graphene/Al composite delivers an electrical conductivity of 73.37% IACS, representing a 17.58% improvement relative to the pure aluminum, while maintaining a high ultimate tensile strength of 318 MPa. The optimization of the ultimate tensile strength and conductivity follows distinct pathways, governed respectively by interfacial phase-architecture strengthening and work-function-induced electronic doping. This strategy offers a scalable route for synergistically regulating interfacial phases and electronic structures toward high-strength and high-conductivity aluminum-matrix composites for structural–functional integration. Download: Download high-res image (322KB) Download: Download full-size image
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危险品化学品经营许可证（带存储）