IONICS
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2026
·
IF 3.4
Guan Zhirong,Zhang Yudong,Sun Hui,Yu Jian,Li Lin,Zhou Tong,Zhang Xuejing,Huang Saifang
Ni-rich cathode materials are highly promising for high-performance lithium-ion batteries, owing to their superior overall electrochemical properties. The electrochemical performance of these materials is intimately linked to the degree of ordered development within their layered structure. However, the optimal lithiation calcination temperature for achieving highly ordered layered structures varies among Ni-rich materials with different nickel contents, and this critical parameter has not been thoroughly investigated. This study systematically addresses this gap by selecting four precursors with distinct nickel contents and subjecting them to lithiation calcination across a series of stepwise temperatures. Through in-situ high-temperature X-ray diffraction (XRD) and XRD Rietveld refinement, we deciphered the dynamic evolution characteristics of layered structures during lithiation in materials with varying nickel contents. Furthermore, we clarified the regulatory effect of lithiation temperature on the materials’ structural order and concurrently evaluated their electrochemical performance. Ultimately, this research clarifies the intrinsic relationship between lithiation temperature, layered structure characteristics, and electrochemical performance, offering significant guidance for the precise design and preparation of high-performance Ni-rich cathode materials.
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Petroleum Science
·
2026
·
IF 6.4
Xue-Feng Song,Xue-Man Wang,Yan Bing,Yu Fan
A novel polyacrylamide-assisted method for synthesizing the hierarchical SAPO-11-wrapped Ni catalyst was proposed. In this method, firstly, Ni 2+ ions from nickel salts were coordinated with nitrogen atoms in polyacrylamide (HPAM) to form a Ni 2+ -HPAM complex; then, Ni 2+ -HPAM was adsorbed on negative SAPO-11 crystals during the crystallization of SAPO-11, and Ni 2+ -HPAM was wrapped by SAPO-11 crystals with the growth of these crystals; finally, Ni 2+ -HPAM was transformed into NiO nanoparticles (about 2.5 nm) wrapped by SAPO-11 crystals after the HPAM was removed during calcination. This method obtained an in-situ Ni@SAPO-11 assembly with hierarchical pore structures and highly dispersed Ni metals. Compared with both Ni/SAPO-4.0 with the same Ni content synthesized by conventional impregnation and the Ni@SAC-4.0 in which Ni salt was introduced into SAPO-11 in situ without HPAM addition, the as-synthesized catalyst (Ni@SACH-4.0) exhibited a higher Ni dispersion with smaller Ni nanoparticles, and more mesopores and Brønsted (B) acid sites. Consequently, Ni@SACH-4.0 showed a higher C 10 isomer yield (78.2%) and a lower cracking selectivity (9.4%) than Ni/SAPO-4.0 and Ni@SAC-4.0.
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CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 12.5
Haiyang Zhai,Jie He,Suili Shi,Mingtang Liu,Zhiliang Jin
A pretreatment method can simultaneously achieve the removal of the surface passivation layer and vacancy engineering. • The difference in work function drives electron injection, resulting in a redistribution of electrons at the interface. • A multi-scale evidence chain verified the vacancy construction and directional charge transfer in a closed-loop manner. • Ion-intercalation pseudocapacitive storage provides high capacitance, wide voltage window, and persistent ASC performance. Owing to sluggish kinetic processes, the development of high-energy-density supercapacitors still faces major challenges. Herein, a NiSe 2 -Vse@Ni-Co PBA heterojunction synthesized through a sodium borohydride (NaBH 4 ) pretreatment-assisted assembly strategy is reported. The novelty of this work lies in the fact that the NaBH 4 treatment simultaneously depassivates the NiSe 2 surface, introduces a high density of selenium vacancies, and weakens the electrostatic repulsion between NiSe 2 and negatively charged Ni-Co PBA, thereby facilitating closer interfacial contact. Electron paramagnetic resonance (EPR) measurements confirm the successful generation of selenium vacancies. Density functional theory (DFT) calculations further reveal a pronounced work-function difference between NiSe 2 and Ni-Co PBA, while selenium vacancies increase the d-orbital states near the Fermi level in NiSe 2 -Vse. Together, these factors favour directional electron donation from the vacancy-rich NiSe 2 side to the PBA side after interfacial contact. Combined with the XPS results, this interfacial electron redistribution is consistent with the partial reduction of Co species and the markedly improved charge-transfer behaviour. As a result, the optimised electrode delivers a high specific capacitance of 1631.14 F g −1 and retains 80.37% of its initial capacitance after 5000 cycles. The assembled asymmetric supercapacitor operates stably at 1.7 V, achieving an energy density of 52.19 Wh kg −1 at a power density of 739.64 W kg −1 , and maintains 78.71% of its initial capacitance after 5500 cycles. This work shows that a simple pretreatment step can integrate surface depassivation, vacancy engineering, and work-function-driven interfacial electron redistribution into a single heterojunction system, offering a practical route to high-performance supercapacitor electrodes. Download: Download high-res image (189KB) Download: Download full-size image
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Metals
·
2026
·Vol. 16
·期 8
·922
·
IF 3.1
Guangya Hou,Jingnan Wei,Jianli Zhang,Qiang Chen,Yiping Tang
The development of lightweight, low-cost, and high-performance non-precious metal electrocatalytic electrodes is critical to advancing the practical implementation of methanol and urea oxidation reactions (MOR and UOR) in next-generation energy conversion systems. Herein, we reported a facile synthesis of a W-Se co-modified porous Ni/Cu paper electrode (W-NiSe/Cup) via synchronous pulse electrodeposition onto filter paper-derived porous Cu foil. The hierarchical porosity and high specific surface area originated from the paper template, while synergistic electronic modulation among Ni, W, and Se enhanced intrinsic catalytic activity. At 0.8 V, the W-NiSe/Cupelectrode delivered current densities of 298 mA·cm−2(MOR) and 305 mA·cm−2(UOR) with a lower-mass loading, representing 1.29-fold and 1.34-fold enhancements over the Ni/Cupelectrode. Furthermore, the electrode exhibited exceptional durability: under chronopotentiometry operation at 100 mA·cm−2in a 6-fold-concentrated electrolyte (6 M KOH + 3.0 M CH3OH + 1.98 M CO(NH2)2), the operating potentials retained 95.74% (MOR) and 118.05% (UOR) of their initial values after 9 h. This study offers a novel strategy for designing lightweight non-precious metal catalytic electrodes for portable energy devices and also verifies the broad potential of biomass templates in constructing advanced energy electrocatalytic materials.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Wang Jun,Ding Yunshan,Liao Xinyi,Hu Yu,Zhang Jian,Zhou Yulin,Li Zengrui,Huang Jinhan,Chen Liangzhe,Ke Heng
Developing cost-effective and high-performance non-precious electrocatalysts toward the hydrogen evolution reaction (HER) as alternatives to substitute platinum (Pt)-based remains a formidable bottleneck for large-scale industrial water electrolysis. Herein, a molten salt synthetic route to fabricate a series of composite materials composed of nickel (Ni) nanoparticles incorporated on carbon materials (denoted Ni/C-m) for efficient alkaline HER electrocatalyst. The ratio between Ni and C of the composite materials Ni/C-m can be modulated by tuning the mass of carbon material precursor. Benefiting from optimized component proportions, the optimal Ni/C-1.0 sample exhibits an overpotential of −106 mV at the current density of −10 mA cm −2 and long-term durability under alkaline solution. The outstanding HER electrocatalytic performance originates from the well conductive of carbon materials and the synergistic interaction between Ni nanoparticles and C. This study offers a straightforward, scalable synthetic method to construct affordable and high-efficiency non-precious HER electrocatalyst for electrocatalytic hydrogen production. Graphical Herein, Ni nanoparticles incorporated on carbon materials (Ni/C) were synthesized via molten salt strategy. Through regulate the mass of carbon materials precursor, the molar ratio between Ni and carbon materials of Ni/C can be adjusted. The synergistic interaction between Ni and carbon material can enhances the Ni/C electrocatalyst HER performance. As-prepared Ni/C electrocatalyst possess the optimal ratio of Ni and carbon materials which exhibits an excellent HER performance with an low overpotential of −106 mV at the current density of −10 mA cm −2 and long-term stability. This work open a new insight for fabricating and designing transition metal electrocatalysts for industrial hydrogen production.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Rui Yu,Yuli Lan,Guoliang Huang,Congmei Chen,Maofei Ran,Wenjing Sun
The development of high-performance, magnetically recyclable nanocatalysts remains challenging, primarily due to the poor stability and inadequate control over active metal dispersion in conventional magnetic supports. To address these limitations, we designed a Ni@CNTs@PDA–Pd catalyst through innovative interfacial engineering. Carbon nanotube channels effectively encapsulate and protect magnetic nickel nanoparticles, while a polydopamine (PDA) coating enables uniform dispersion of palladium nanoparticles (2.0 ± 0.7 nm). The catalyst exhibits strong superparamagnetism (6.64 emu·g⁻¹), allowing efficient magnetic separation. In Heck reactions, it achieves a turnover frequency (TOF) of 958 h⁻¹ and retains 89.5% conversion after ten cycles, outperforming most reported Pd/CNT and magnetic catalysts. Density functional theory (DFT) calculations reveal that although Ni encapsulation increases the electron density of the CNT surface—which may hinder Pd deposition—the PDA interlayer counteracts this effect via strong coordination bonds, ensuring excellent Pd stabilization. This study provides key insights into electronic metal–support interactions and offers a scalable strategy for designing high-performance magnetically recyclable catalysts. It highlights the active role of the magnetic core in modulating the electronic environment of catalytic sites and underscores the critical synergy between the core, shell, and active metal in rational catalyst design.
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Small
·
2025
·
IF 12.1
Haoquan Wang,Weiqi Liu,Shiyong Xu,Haishen Jiang,Hong Wang,Lang Xu
Earth-abundant transition-metal-based single-atom catalysts and nanoparticulate catalysts exhibit relatively high performance for the electrocatalytic CO 2 reduction reaction (eCO 2 RR). However, the localized orbital structures of active sites of single-atom catalysts make it difficult to effectively couple key intermediates, thereby limiting their catalytic performance. Nanoparticulate catalysts are prone to aggregation during the eCO 2 RR, leading to an unwanted hydrogen evolution reaction. In response to these problems, a porous carbon catalyst with Ni─N─P ternary co-doping through a two-step pyrolysis process is prepared. Ni nanoparticles (NPs) are encapsulated in the carbon support and atomically dispersed Ni single atoms (SAs) are anchored to the carbon support surface. The internal Ni─NPs provide electrons for the surface Ni─SAs, thereby helping enhance the electron-transfer efficiency. The doping element P not only tailors the sizes of Ni─NPs, suppressing their hydrogen evolution activity but also forms the asymmetric NiN 3 P─SA active sites, enhancing the coupling strength between the catalyst and adsorbed intermediates. Given the unique structural features, this porous Ni─N─P ternary co-doped coal-based catalyst achieves increased CO selectivity (95%), current density (227.4 mA cm −2 ) and stability (120 h).
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ChemistrySelect
·
2025
·Vol. 10
·期 23
·e00337
·
IF 2
Jingjing Yang,Xiayan Zhang,Zhi Song,Jialu Liu,Yeqiong Huang,Dongxu Han,Chuhan Xing,Jing Zhang,Boxia Liu
Graphical The Ni 3 Fe 1 -BC composite, featuring a coral-like mesoporous architecture and exposed Ni 2+ /Fe 3+ active sites, facilitates the rapid, monolayer adsorption of methyl blue through strong Ni─O coordination. The process follows Langmuir isotherm and pseudo-second-order kinetics, indicating high affinity and thermodynamic spontaneity. In this paper, the coral-like structure of Ni/Fe bimetallic atom cluster composite adsorbent (Ni 3 Fe 1 -BC) was utilized for the efficient removal of methyl blue (MB), and a removal rate of 98% could be achieved within 25 min. The large specific surface area and mesoporous structure of the material provide effective channels for the diffusion and adsorption of MB molecules. Ni 2+ and Fe 3+ species act as key adsorption sites during the adsorption process, especially when the oxygen atoms in MB first interact with Ni atoms to form a stable chemical bond, which enhances the stability of adsorption. Meanwhile, the adsorption process conformed to the pseudo-secondary kinetic model, and the isotherm analysis showed that the Langmuir model fitted better, reflecting the monolayer adsorption characteristics. The adsorption energy E ads = −2.04 eV further proved that the adsorption process was spontaneous and exothermic with good thermodynamic stability. In addition, Ni 3 Fe 1 -BC exhibits excellent adaptability and cyclic stability in different water environments, making it an efficient and stable adsorbent for water treatment.
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Science China-Materials
·
2025
·
IF 7.4
Yu Jianli,Shen Yongli,Zhu Pei,Li Lina,An Changhua
Sluggish water dissociation kinetics in the alkaline hydrogen evolution reaction (HER) continue to hamper its practical production. Herein, a class of heterojunction electrocatalyst featuring Ru-Ni(OH) 2 interfaces on nickel foam (NF) with self-engineered built-in electric fields (BIEF) has been synthesized via a simple in situ galvanic replacement reaction. The as-made hierarchical architecture of Ru-Ni (OH) 2 /NF exhibits a record overpotential of 9.6 mV at a current density of 10 mA cm −2 for alkaline HER, surpassing most reported catalysts and the commercial Pt/C benchmark. Furthermore, it also reveals exceptional catalytic activity towards hydrazine oxidation reaction (HzOR) at 100 mA cm −2 with a remarkably low potential of ca. 0.015 V vs. RHE (reversible hydrogen electrode). The assembled overall hydrazine splitting (OHzS) system integrating HER and HzOR requires a cell voltage of about 0.09 V to reach 50 mA cm −2 , which is 1.637 V lower than the corresponding overall water splitting (OWS) device. Systematic analysis and calculation reveal that the BIEF induces the redistribution of interfacial electrons for Ru, facilitating H 2 O dissociation and intermediates conversion to deliver the ultra-high electrocatalytic performance. This work provides an avenue for the design and preparation of electric field-mediated catalysts towards sustainable energy conversion.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Maria Ahmad,Abdulraheem SA Almalki,Wajid Sajjad,Farhan Zafar,Hafiz Muhammad Asif,Muhammad Ali Khan,Naeem Akhtar,Muhammad Sohail,Gaber A.M. Mersal,Mohamed M. Ibrahim
Transition metal (TM) doped transition metal oxides (TMOs) have emerged as promising materials for supercapacitor application due to their redox activity, large surface area, and high specific capacitance. However, optimizing their electrochemical properties remains challenging. In this work, we have synthesized Ni- and Co-doped CuO nanocomposites via a straightforward hydrothermal approach to examine the effects of doping on their nanostructure, crystallinity, and redox properties. Additionally, machine learning (ML) was employed to optimize fabricated material composition to enhance the electrochemical efficacy of the designed materials. Results demonstrate that ML-optimized Ni-doped CuO has shown a high specific capacitance of 496 Fg −1 at a current density of 1.5 Ag −1 as compared to Co-doped CuO (245 Fg −1 ). Ni-doped CuO achieved a high-power density of 12,469 Wkg −1 and energy density of 111 Whkg −1 , demonstrating enhanced electrochemical performance. The improved properties of Ni-doped CuO are attributed to enhance synergistic effect between Ni-doped CuO, which facilitates faster electron transfer and enhances the material's stability and achieved capacitance retention of 95.1 %. This study presents an economical and effective method for optimizing TM-doped CuO nanocomposites. Ni-doping exhibits excellent performance, which offers significant potential for next-generation energy storage devices.
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Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·237
·
IF 38.5
Wang Xiaoxue,Xu Yuhui,Zhang Jianhua,Xi Yukun,Hou Ningjing,Chen Yixuan,Liu Dongzhu,Yang Zihao,Wen Haocheng,Kang Jia,Yang Xiaoli,Song Xuexia,Wang Jingjing,Li Wenbin,Zhang Jiujun,Zhang Kun,Li Xifei
Na4Fe3(PO4)2P2O7 (NFPP) is regarded as a prospective cathode for sodium-ion batteries (SIBs) because of its high structural stability and cost-effectiveness. However, its practical application is hindered by intrinsically low electronic conductivity. Herein, an unconventional electron transfer mechanism from Ni2+ to Fe3+ ions is unveiled in Ni-doped Na4.3Fe3(PO4)2P2O7 (NFPP-Ni) cathode, which facilitates electronic coupling within the Fe−O−Ni coordination unit and thereby effectively boosts electron transport. Moreover, the redox kinetics and reversibility of NFPP materials are predominantly governed by the degree of Fe−O covalency. The intermediate eg occupancy of Fe2+, modulated by the presence of Ni2+, optimizes the overlap between Fe d and O p orbitals. The adjustment of Ni dopant strikes a balance between accelerating Na+ diffusion kinetics and mitigating lattice strain during cycling. As a result, the NFPP-Ni electrode displays impressive rate capacity (121.0 mAh g−1 at 0.1C / 80.9 mAh g−1 at 10C) and stable cyclability (89.1% capacity retention after 1000 cycles). More importantly, the relationship between Fe eg orbital occupancy and Fe−O covalency in NFPP as modulated by various transition metal cations (Ni2+, Mn2+, Zn2+, Co2+ and Cu2+) with different electron configurations are systematically elucidated, thereby providing insights for the commercial development of sodium-ion batteries (SIBs).
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Small
·
2026
·
IF 12.1
Bin Li,Hao Xiong,Guangying Chen,Xiaomin Guan,Jing Chen,Jian Pu,Bo Chi,Yunfeng Tian,Kaisheng Xia
The development of oxygen electrodes for reversible solid oxide cells (RSOCs) is hindered by insufficient catalytic activity, limited stability, and a mismatch in the thermal expansion coefficients (TEC) with electrolytes. Herein, we design and synthesize a novel perovskite oxide, La 0.6 Ca 0.4 Fe 0.8 Ni 0.1 Co 0.1 O 3–δ (LCFNC), using a multi-element B-site synergistic doping strategy. Systematic investigations reveal that the incorporation of Fe stabilizes the perovskite lattice, while the addition of Ni and Ca effectively suppresses the TEC (to 12.7 × 10 −6 K −1 after GDC compositing), ensuring excellent electrolyte compatibility. Furthermore, the cooperative interplay between Ni, Co, and Fe establishes ternary active centers, significantly increasing the concentration of surface oxygen vacancies. Full-cell measurements demonstrate a peak power density of 1.60 W·cm −2 at 800°C and a high electrolysis current density of 1.82 A·cm −2 at 1.3 V. Stability tests, including 100 h of constant-current electrolysis at 750°C and 24 reversible operation cycles, highlight exceptional interfacial and structural stability. More importantly, the assembled industrial-sized RSOCs (15 × 15 cm 2 ) achieve an output power of 64 W in fuel cell mode and a maximum current of 105 A in electrolyzer mode at 800°C, demonstrating its potential for practical applications. This work elucidates the mechanistic role of multi-element B-site regulation and provides an effective design principle for oxygen electrode materials that enhance activity, stability, and compatibility simultaneously, thus advancing the practical deployment of high-performance RSOCs.
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