JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Liang Yan,Weiwei Men,Yujing Zhang,Yanqi Wu,Xuan Yang,Yilin Zhang,Chuyang Liu,Jun Liu,Feng Xu
To address the challenges of impedance mismatch and limited absorption bandwidth in ferrite-based microwave absorbers, a one-step oxygen-deficient sintering process was employed to fabricate Zn 0.35 Ni 0.65 Fe 2 O 4 /Ni-Cu multiphase composites. This approach effectively regulates Cu 2+ substitution for Ni 2+ /Zn 2+ in the ferrite lattice while modifying the Ostwald ripening process, synergistically enhancing dielectric and magnetic losses. The pure Zn 0.35 Ni 0.65 Fe 2 O 4 exhibits a broad low-frequency absorption of 5.6 GHz (3.4–9.0 GHz, covering the entire C-band). Notably, the Zn 0.35 Ni 0.65 Fe 2 O 4 /Ni-Cu composite achieves a remarkable minimum reflection loss (RL min ) of −35 dB along with an effective absorption bandwidth (EAB) of 4.7 GHz. Consequently, this work provides both a facile synthesis methodology and mechanistic insights for designing high-performance electromagnetic materials with multiband operability.
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高影响因子
CARBON
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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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PROCEEDINGS OF THE COMBUSTION INSTITUTE
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2026
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IF 4.6
Junlei Wang,Jinyu Li,Yunfei Xu,Haojie Guo,Shilong Li,Kun Wang
Flame-assisted spray pyrolysis (FASP) is emerging as a promising approach for synthesizing Ni-rich cathodes of lithium-ion batteries (LIBs). In conventional wet chemistry approaches, lithium nitrate (LiNO 3 ) is frequently utilized as an effective flux to achieve enhanced battery performance; yet LiNO 3 is usually decomposed completely during current FASP that operates under high flame temperatures. Thermogravimetric analysis (TGA) for LiNO 3 and transition metal nitrates (Ni, Co, Mn) reveals that they are actually starting (and finishing) decomposing in much lower temperatures than previous studies assumed. And more importantly, there exists a notable gap of decomposition temperature (up to 356 °C) between LiNO 3 and the transition metal nitrates. Based on these findings, the present study proposed a low-temperature strategy to achieve only partial decomposition of LiNO 3 during FASP and taking advantage of the fluxing function of LiNO 3 to realize improved electrochemical performance of Ni-rich cathodes for LIBs. Specifically, an experimentally and theoretically confirmed low-temperature ∼665 °C of the co-axil flame was designed, which was shown to completely decompose the three transition metal nitrates while only partially decompose LiNO 3 . The undecomposed LiNO 3 was characterized and shown to act as a flux during the subsequent calcination stage, promoting the formation of NCM811 with larger primary particles, improved structural ordering, and reduced Li + /Ni 2+ cation mixing. Consequently, the synthesized Ni-rich cathode material achieved superior cycling stability (86.4% capacity retention after 100 cycles at 0.33 C) and rate performance (136.8 mAh/g at 5 C), notably outperforming the samples by the controlling high-temperature (∼1180 °C) strategy. The findings of the present work offered a new conception for the effective synthesis of high-performance Ni-rich cathodes through flame-assisted spray pyrolysis. Novelty and significance statement The present study introduces a novel low-temperature FASP strategy that selectively retains undecomposed LiNO 3 to utilize its intrinsic fluxing properties. Thermogravimetric analysis identifies a > 350 °C decomposition gap between LiNO 3 and transition-metal nitrates, enabling controlled partial decomposition of LiNO 3 , in contrast to current high-temperature FASP that melts and decomposes all salts indiscriminately. The undecomposed LiNO 3 during synthesis enables the growth of single-crystal-like NCM811 with enhanced structural ordering and reduced cation mixing, leading to superior electrochemical performance, all within a rapid, one-step flame synthesis process. These findings reveal how tailored flame conditions can direct intermediate material evolution, offering the combustion community a new strategy for designing complex functional nanomaterials and advancing the role of flame synthesis in energy applications.
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SEPARATION SCIENCE AND TECHNOLOGY
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2026
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IF 2.5
Renfan Chen,Zhen Wang,Wenpu Zhang,Weilong Wu,Kunxi Huang,Hongbin Wang,Yaohui Yang,Kaile Zhao
The efficient recovery of strategic cobalt (Co) and nickel (Ni) from complex secondary resources is crucial for resource security. This study addresses a key bottleneck hindering short-process all-flotation routes: the difficulty in direct separation of reagent-coated sulfur-cobalt bulk concentrate derived from pre-concentrated vanadium titanomagnetite tailings. A synergistic reagent system featuring a calcium-based composite modifier (CCM) and a mercapto-based depressant (3-MP) was developed, enabling flotation separation of industrial reagent-laden sulfide feed without any pretreatment. In laboratory closed-circuit tests, a Co-Ni concentrate assaying 2.16% Co and 4.95% Ni was produced from 0.35% Co feed, with 80.82% Co and 79.65% Ni recoveries and a Co/S selectivity coefficient of 5.9, which compares favorably with traditional pretreatment-dependent processes. The process was scaled up to a 30,000 tonne per annum industrial production line. Stable operation yielded a Co-Ni concentrate (1.82% Co, 4.35% Ni), salable sulfur concentrate with sulfur content of no less than 30%, and confirmed simultaneous copper recovery. This work offers a practically and industrially tested framework for short-process clean recovery of critical metals from sulfide ores.
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Inorganics
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2026
·Vol. 14
·期 7
·186
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IF 3.4
Yao Lv,Jianfeng Yu,Liqiu Shi,Shifei Huang
Ni-rich layered oxide LiNi0.91Co0.06Al0.03O2(NCA91) with high specific capacity has emerged as a leading cathode candidate for advanced lithium-ion batteries (LIBs). Nevertheless, increase in Ni content triggers structural instability and fast capacity degradation, which severely impedes the practical application of Ni-rich materials. Herein, a comprehensive study is conducted to explore the structural evolution and electrochemical behaviors of NCA91 cathodes with precisely tuned Li/TMs (transition metals) molar ratios spanning from 1.01 to 1.07. Results reveal that the NCA91 electrode with an optimal Li/TMs ratio of 1.03 exhibits outstanding structural integrity, coupled with remarkable cycling durability and rate capability. Specifically, the cathode with Li/TMs = 1.03 retains 88% of its initial capacity after 100 cycles at 1 C, and maintains ~130 mAh g−1even at 10 C. This work establishes a quantitative structure–composition–performance correlation that offers critical design principles for developing ultrahigh-nickel cathode materials.
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ELECTROCHIMICA ACTA
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2026
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IF 5.8
Senyang Song,Fangfang Shang,Mengwei Yin,Qianqian Wang,Yi Liu,Ran Bi,Xiaoyan Ma
Gallic acid (GA) chelates with exposed metal active sites of Ni/Co-DABD MOF, effectively protecting metal ions and elevating MOF coordination stability. • The GA-modified Ni/Co-DABD MOF@NH₂-MXene composite electrode delivers a high specific capacitance of 2044 F g -1 at 1 A g -1 with superior rate capability and cycling durability. • GA modification strengthens the interfacial synergy between MOF and NH₂-MXene, significantly boosting charge transfer efficiency and structural stability of the composite. The limited active sites and poor electrochemical structural stability of metal-organic frameworks (MOF) severely limit their application in electrochemical energy storage. In this study, we used the acid properties of gallic acid (GA) as an etching agent to etch MOF surface active sites. Subsequently, the protonated GA is further chelated with the exposed metal active site, which can effectively protect the metal ions. At the same time, GA provides a large number of phenolic hydroxyl groups, which greatly improves the coordination stability of MOF. A new MOF@MXene composite electrode material was obtained by solvothermal synthesis of GA-modified MOF and aminated MXene. The electrochemical test results show that the new MOF@MXene composite electrode material synthesized by this scheme has high specific capacitance and high rate stability. The functional modification of MOF by GA greatly improves the synergistic binding performance between MOF and MXene, and thus significantly improves the electrochemical stability of composite electrode materials. The mechanism of the electrochemical reaction was investigated by in-situ X-ray diffraction and theoretical calculation. In this paper, the functional mechanism of polyphenols on MOF is described, which provides a new idea for the electrochemical application of MOF. The GA-modified Ni/Co-DABD MOF@NH₂-MXene composite electrode delivers a high specific capacitance of 2044 F g -1 at 1 A g -1 with superior rate capability and cycling durability. Download: Download high-res image (296KB) Download: Download full-size image
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JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
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2018
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IF 1.485
Zhang Zilong,Wang Zilin,Heng Liuyang,Wang Shuai,Chen Xiqiao,Fu Xiquan,Zou Yanhong,Tang Zhixiang
MoS2 is a promising material with microwave absorption performance due to its high dielectric properties and low density. However, pure MoS2 is non-magnetic and has a bad impedance matching characteristic. In this study we prepared the Ni/MoS2 nanocomposites by cladding the MoS2 micrometer slices with magnetic Ni nanoparticles. Our results show that the microwave absorption properties of Ni/MoS2 nanocomposites have been improved obviously compared with the pure MoS2. Because of the introduction of Ni particles, the permeability of the nanocomposites has been turned from one to a complex, indicating a newly added magnetic loss. Meanwhile, the big gap between the permittivity and permeability of the Ni/MoS2 nanocomposites has been properly narrowed, which suggests an improved impedance matching. Moreover, the dielectric Cole–Cole semicircle shows that there are more Debye relaxation processes for the Ni/MoS2 nanocomposites, which further enhances the dielectric loss. Due to its improved electromagnetic properties, the minimum reflection loss (RL) value of the Ni/MoS2 nanocomposites with 60 wt % loading reaches −55 dB and the absorption bandwidth (<−10 dB) is up to 4.0 GHz (10.8–14.8 GHz) with a matching thickness of 1.5 mm. The results provide an excellent candidate for microwave absorbing materials with a broad effective absorption bandwidth at thin thicknesses.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Xiangyang Gao,Xin Liu,Chenxi Zhou,Qiyan Wang,Ruya Guo
Tailoring efficient bifunctional electrocatalyst with dual-heterojunction is crucial for overall water splitting (OWS). Herein, a multicomponent bifunctional catalyst with dual-heterojunction is rapidly constructed via sequential electrodeposition for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Density functional theory (DFT) calculations reveal that bidirectional electron transfer at the interface induces a double built-in electric field (BIEF) in Pt/CeO 2 -Ni(OH) 2 , which offers additional impetus for electron transport and brings the d -band center closer to the Fermi level, thereby optimizing reaction kinetics and the adsorption of reaction intermediates. Active Pt and CeO 2 nanoparticles (NPs) are uniformly anchored on the stable Ni(OH) 2 nanoflocs, ensuring high exposure of active sites and preventing NPs aggregation. Meanwhile, Ni(OH) 2 , serving as abundant electron donor center, forms dual heterointerface with Pt and CeO 2 (Pt-Ni(OH) 2 and CeO 2 -Ni(OH) 2 ), which ensures structural stability during electrochemical processes. Benefiting from the dual-heterojunction and the unique structure design, Pt/CeO 2 -Ni(OH) 2 exhibits excellent electrocatalytic performance, requiring only 66 mV (10 mA cm −2 ) and 278 mV (100 mA cm −2 ) for HER and OER, respectively. Remarkably, the two-electrode electrolyzer based on Pt/CeO 2 -Ni(OH) 2 electrode requires only 1.49 V to deliver 10 mA cm −2 with an excellent durability for OWS. This work brings light to the rational design and directional construction of bifunctional electrocatalyst hybrid nanomaterials with multiple heterojunctions.
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Small
·
2026
·
IF 11.8
Weihao Xu,Zixuan Wang,Menglong Xu,Runlin Chen,Yurou Guo,Jun Wang
Rationally coupling nanoscale material design with macroscopic architecture is crucial for achieving lightweight absorbers with broadband and strong electromagnetic (EM) wave attenuation. Herein, multiscale-engineered polyimide (PI)/MXene/Ni aerogels integrating magnetic Ni nanochains, dielectric MXene sheets, and anisotropic porous architectures are reported. Ni nanochains with controlled morphology were synthesized via NaOH-assisted hydrazine reduction, while directional freezing enabled the fabrication of random, parallel, and normal aerogel architectures. The normal-aligned PI/MXene/Ni aerogel exhibits a remarkable minimum reflection loss (RL min ) of −72.42 dB at 2.8 mm. Guided by a genetic-algorithm optimization, tri-layer assemblies further expand the effective absorption bandwidth (EAB) to 8.4 GHz while maintaining an outstanding RL min of −61.69 dB. The superior absorption originates from synergistic dielectric–magnetic–structural losses, including interfacial polarization, ohmic/eddy-current dissipation, and gradient impedance matching enabled by the layered porous framework. Beyond EM attenuation, the aerogels feature ultralow density, high compressive strength, enhanced hydrophobicity, intrinsic flame retardancy, and low thermal conductivity, providing effective infrared stealth and thermal protection. This work demonstrates a multiscale design strategy to create multifunctional, broadband EM absorbers for demanding electronic and aerospace environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Liquan Xiong,Ying Wang,Di Gao,Yueqi Song,Dongsheng Chen
Hydrogen energy is the core of future clean energy, and the study of hydrogen evolution reaction (HER) electrocatalytic mechanisms is essential for efficient production. The development of efficient and low-cost electrocatalysts is a key challenge in achieving ideal hydrogen generation. In this study, a Ni-BDC/TpPa-1 heterojunction material was prepared for the first time, which was converted into a derived heterojunction material (NiO@Ni/N-C) after high-temperature pyrolysis treatment, exhibiting excellent electrocatalytic activity in an alkaline solution. Without iR compensation, the overpotential of HER is only 83 mV at a current density of 10 mA·cm⁻². Compared with thermally decomposed Ni-BDC and TpPa-1 monomer, its electrocatalytic activity is improved by 158 and 435 mV, respectively, and it exhibits excellent stability over 100 h. The design of this novel material offers a new solution for enhancing the efficiency of transition-metal-based catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Manli Wang,Zhicheng Liu,Ming Hou,Xu Luo,Wenbin Yang,Hongjie Zhang,Xiaoming Song,Zhigang Shao
The irreversible degradation of platinum-based catalysts caused by strong sulfur dioxide (SO₂) adsorption poses a primary obstacle to the oxygen reduction reaction (ORR), limiting the practical application of proton exchange membrane fuel cells. Herein, we design and synthesize an anti-SO 2 poisoning Pt-based catalyst comprising Pt nanoparticles anchored on a single-atom Ni-N-HCNs support. The obtained catalyst (Pt/Ni-N-HCNs) exhibits exceptional tolerance to SO₂ poisoning, demonstrating a minimal negative shift of only 47.7 mV in the half-wave potential after contamination, compared to the 79.4 mV shift observed for commercial Pt/C. More importantly, Pt/Ni-N-HCNs catalyst demonstrates significantly enhanced ORR performance, with a mass activity of 0.58 A mg Pt −1 and a specific activity of 1.57 mA cm −2 , representing 1.2-fold and 2.7-fold improvements over commercial Pt/C, respectively. Density functional theory (DFT) calculations and XPS results reveal that the strong metal-support interaction (SMSI) induces the downshift of the d-band center of Pt, thereby weakening SO 2 adsorption and facilitating SO 2 removal. Furthermore, the Ni N site in Ni-N-HCNs support exhibits high activity for SO 2 oxidation, promoting the effective removal of SO 2 from adjacent Pt sites. Both effects synergistically enhance the resistance to SO 2 poisoning of the Pt/Ni-N-HCNs catalyst without sacrificing ORR performance. This work provides insights into the design of poison-resistant electrocatalysts and the development of energy conversion systems with high environmental applicability.
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.3
Ying Liang,Xianping Liao,Yingshuai Jia,Shiming Guan,Wanling Zhang,Wenbiao Zhang,Yuying Meng,Yi Tang,Qingsheng Gao
Electrooxidation offers a sustainable alternative by utilizing renewable energy to convert biomass-derived cyclohexanol (CHA) to adipic acid (AA), a key industrial chemical for nylon-66 and polyurethane production. While bimetallic Ni-based catalysts enhance the conversion, the role of secondary metals in modulating Ni active-site reconstruction during operation remains unclear, limiting performance optimization. Here, we demonstrate that Cr-doping promoted the dynamic reconstruction of Ni(OH)2 nanosheets to form NiOOH with abundant Ni3+ and oxygen vacancies (OVs), significantly boosting AA electrosynthesis. In situ characterizations reveal that Cr-doping accelerates OH– adsorption and promotes NiOOH formation, while subsequent Cr3+ leaching generates OVs, thus, resolving the long-standing dilemma between stabilizing high-valence Ni and maintaining abundant defects. The optimized catalyst achieves 78.1% AA yield and 85.4% Faradaic efficiency at 1.45 V vs RHE, outperforming undoped Ni(OH)2 and prior systems. Mechanistic studies identify surface Ni3+ and OVs-stabilized *OOH species as the keys for CHA dehydrogenation and cyclohexanone oxidation, respectively. Moreover, a membrane electrode assembly electrolyzer was designed for the efficient coproduction of AA (0.078 mmol h–1 cm–2) and H2 (42.9 mL h–1 cm–2) at a current density of 100 mA cm–2, demonstrating the scalability. This work clarifies the in situ reconstruction of bimetallic sites and provides a design strategy for the efficient electrosynthesis.
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