Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123938
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IF 7.5
Yanli Wang,Wenqing Xu,Tingyu Zhu,Zhikun Zhang
The severe self-aggregation and instability of polyamines at high loadings remain major mass-transfer limitations in solid amine sorbents. To overcome this kinetic limitation, we propose a molecular-level regulation strategy by incorporating trace Ni (1 wt%) into tetraethylenepentamine (TEPA) confined within a hierarchical porous geopolymer-zeolite framework. Rather than acting as a conventional promoter, the intentionally introduced Ni forms specific Ni-TEPA coordination complexes, which significantly disrupted the intermolecular hydrogen-bonding network and inhibited polyamine aggregation. Consequently, the Ni-modified sorbent effectively alleviated diffusion resistance, exhibiting substantially improved amine accessibility and accelerated adsorption kinetics. Density functional theory (DFT) combined with spectroscopic analyses revealed that Ni coordination systematically reduced the electron density around the amine nitrogen sites, substantially lowering the apparent adsorption activation energy to 8.28 kJ/mol. Under simulated post-combustion conditions (15 vol% CO 2 , 70 °C), the optimized sorbent achieved a high CO 2 uptake of 3.92 mmol/g and retained 99.75% of its initial capacity after 10 cycles. Furthermore, utilizing waste-derived zeolite-geopolymer (from municipal solid waste incineration and coal fly ash) as the robust support yields a potentially attractive manufacturing cost of 158.99 ¥/kg, providing a sustainable and scalable chemical engineering approach for industrial flue gas treatment.
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Journal of Energy Storage
·
2026
·
IF 10.7
Huimin Feng,Xinxin Pi,Yanhui Li,Yunkai Wang,Mengjin Wen,Chengrui Wang,Chunlei Zhang,Yan He
The improvement of rechargeable zinc-air batteries is still limited by the sluggish oxygen electrochemistry at the air cathode, where both the oxygen reduction and oxygen evolution processes need to be accelerated. In this work, a Ni/Ni 3 C composite was obtained by thermal treatment using ammonia-activated carbon nanotubes as the conductive backbone and coal tar pitch as a supplementary carbon precursor. Ni and Ni 3 C nanoparticles are anchored on the nanotube framework, and part of their surface is wrapped by graphitized carbon. Such a multiphase architecture builds efficient electron-transport channels, reinforces the coupling between the Ni-based species and the carbon matrix, and improves structural robustness under electrochemical conditions. The catalyst therefore shows strong bifunctional oxygen electrocatalytic activity, giving a half-wave potential of 0.86 V for ORR and an overpotential of 250 mV at 10 mA·cm −2 for OER, together with satisfactory durability. When assembled as the air cathode of a rechargeable zinc-air battery, it affords an open-circuit voltage of about 1.42 V, a peak power density of 195 mW·cm −2 , and stable cycling for more than 200 h at 5 mA·cm −2 . DFT calculations indicate that nitrogen-containing interfacial sites reshape the local charge distribution and improve the adsorption and conversion of oxygen intermediates, which is favorable for both ORR and OER.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zihao Guo,Zeqi Liu,Chaoxuan Wang,Lei Qian
Here, oxygen vacancy was introduced into hexagonal β-Ni(OH) 2 (NV) nanosheets to prepare poly (vinylidene fluoride-co-hexafluoropropylene)-based dielectric composites. Oxygen vacancy gradients were controlled, and the enhanced effects on energy storage performance were systematically investigated. It was found that the oxygen vacancy elevated the Ni 2+ /Ni 3+ ratio, shifted the Fermi level downward and induced formation of deep trap states. The moderate oxygen vacancies produced uniformly distributed deep strap states, which delayed the carrier migration by the capture-release mechanism. The Fermi level (E v − E f ) of NV 1.5 was 1.064 eV and showed the smallest energy separation from the valence-band, resulting in the highest interfacial potential barrier and inhibiting the charge injection. So, the oxygen vacancy obviously affected leakage current, breakdown strength and energy density. It was observed that leakage current density of the composites reduced to 3.48 × 10 −8 A/cm 2 . At the 0.3 wt% loading of NV1.5, the composite achieved a breakdown strength of 792.97 kV/mm and an energy density of 21.15 J/cm 3 (88.17 % over the matrix), with charge–discharge efficiency of 74.12 % and below 1 % performance degradation after 10 4 cycles. This work establishes a novel route based on defect engineering for dielectric storage materials at the atomic level. Download: Download high-res image (101KB) Download: Download full-size image
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Yu-Zheng Wang,Shu-Qi Li,Zi-Kai Zhou,Chao-Jun Chen,Wei Yang,Si-Nuo Zhang,De-Zheng Yang
The development of mild and green ammonia synthesis is a significant and challenging research. In this study, a nanosecond pulse-driven coaxial double dielectric barrier discharge reactor was combined with M/γ-Al 2 O 3 (M = Co, Ni, Co–Ni) catalysts for efficient ammonia synthesis. Key parameters including pulse voltage, gas flow rate, and N 2 /H 2 molar ratio were systematically investigated. The Co–Ni/γ-Al 2 O 3 catalyst achieved the best energy efficiency of 1.11 g/kWh and a synthesis rate of 226.33 μmol g −1 h −1 under optimal conditions, which is 3.44 times higher than that of the plasma only system. Characterization revealed superior metal dispersion, smaller metal particle size, and larger specific surface area for Co–Ni/γ-Al 2 O 3 . Electrical diagnostics and optical emission spectroscopy (OES) showed that catalyst packing enhances discharge intensity and promotes key active species (N 2 ∗, N 2 + , and H α ). Synergistic effects between Co and Ni sites promote ammonia formation. This work provides new insights for designing high-efficiency plasma-catalytic ammonia synthesis systems.
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Nature Communications
·
2026
·
IF 18.1
Fang Jiongchong,Chen Zuochao,Li Junqiang,Zhang Qing,Zeng Lin,Yang Yaoxian,Zhang Xueqiang,Zhang Hui,Gao Haifeng,Lu Xinxin,Ma Jugang,Xie Zhirun,Li Ailong,Yang Fuyuan,Ng Yun Hau,Zeng Guosong
Alkaline hydrogen evolution reaction holds immense promise for sustainable energy conversion due to its inherent compatibility with earth-abundant electrocatalysts and potential for large-scale, high-purity hydrogen production. However, sluggish kinetics remain a formidable bottleneck for its industrial deployment. Although incorporating oxophilic components is widely used to promote water activation, the catalytic role of oxygen-affinity-related sites is often interpreted statically, without considering dynamic evolution of local coordination under operating conditions. Here, we synthesize a crystalline-amorphous Ni/TiO 2 heterojunction via a grain-boundary segregation strategy and combine multi-modal operando techniques to directly visualize reversible, bias-induced reconstruction of the oxophilic component. These observations provide direct evidence that, at the Ni/TiO 2 interface, oxygen affinity is a tunable parameter encoded by nanoscale coordination and interfacial chemistry, and elucidate how its modulation governs water dissociation and hydroxyl handling. We demonstrate that the resulting four-coordinated Ti sites serve as highly efficient centers for water dissociation and hydroxyl adsorption, thereby synergistically optimizing the hydrogen adsorption/desorption energetics. This work offers a mechanistic and methodological basis for rational nano-heterointerfaces engineering in advanced electrocatalysts.
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PHYSICAL REVIEW B
·
2024
·Vol. 109
·期 10
·104402
·
IF 3.2
Kejia Zhu,Mingjie Wang,Yazhou Deng,Mingliang Tian,Bin Lei,Xianhui Chen
We have grown a series of single crystals of two-dimensional van der Waals ferromagnet $\mathrm{F}{\mathrm{e}}_{3}\mathrm{GaT}{\mathrm{e}}_{2}$ substituted with Co or Ni. The large single crystals of ${(\mathrm{F}{\mathrm{e}}_{1\ensuremath{-}x}\mathrm{C}{\mathrm{o}}_{x})}_{3}\mathrm{GaT}{\mathrm{e}}_{2} (0\ensuremath{\le}x\ensuremath{\le}0.55)$ and ${(\mathrm{F}{\mathrm{e}}_{1\ensuremath{-}x}\mathrm{N}{\mathrm{i}}_{x})}_{3}\mathrm{GaT}{\mathrm{e}}_{2} (0\ensuremath{\le}x\ensuremath{\le}0.46)$ were characterized with x-ray diffraction, magnetic susceptibility, electrical resistivity, and Hall measurements. Our results show that the magnetic transition temperatures of $\mathrm{F}{\mathrm{e}}_{3}\mathrm{GaT}{\mathrm{e}}_{2}$ are gradually suppressed upon Co or Ni doping. A small amount of Co or Ni doping results in a significant increase of the coercive field. In particular, Co doping tunes the crystals from ferromagnetism to antiferromagnetism and then to the spin-glass state, while Ni doping tunes the crystals from ferromagnetism to spin-glass states. The strong doping-dependent magnetic properties suggest that $\mathrm{F}{\mathrm{e}}_{3}\mathrm{GaT}{\mathrm{e}}_{2}$ has great potential for spintronic applications.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124587
·
IF 7.5
Xiaoyan Han,Huiling Weng,Yani Shen,Jianjun Chen,Yu Xie,Qiulin Zhang,Ping Ning,Jiming Hao
CO 2 methanation is an important route for carbon emission mitigation and renewable energy storage. However, insufficient CO 2 activation and inefficient hydrogenation of surface intermediates at low temperatures remain major challenges. In this work, Ni/CeO 2 catalysts with distinct metal-support interaction degrees were constructed by regulating the interfacial contact of Ni-Ce, aiming to enhance the low-temperature methanation performance. The results suggest that Ni/CeO 2 with strengthened Ni-CeO 2 interfacial interaction exhibits more oxygen-vacancy-related defect sites, improved reducibility, and favorable Ni dispersion. These interrelated features collectively facilitate CO 2 adsorption/activation and intermediate conversion, thereby contributing to the enhanced low-temperature methanation performance. Specifically, the CO 2 conversion reached ∼80% at 250 °C. In situ Raman spectroscopy suggested the dynamic evolution of oxygen-vacancy-related defect sites during the reaction, while in situ DRIFTS suggested that CO 2 methanation may proceed through both the formate-mediated pathway and the CO* pathway. These findings suggest that tailoring the Ni-Ce interfacial interaction, together with the associated changes in oxygen vacancy related defects, reducibility, and Ni dispersion, may provide an effective approach to improving the low-temperature CO 2 methanation performance of Ni-based catalysts.
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ACS Omega
·
2026
·
IF 5.2
Qing Lin,Haoran Jiang,Yong Hu,Ziwen Dong,Song Kong,Yangli Cui
Addressing the practical predicament of uneven global distribution of phosphate resources, this study focuses on transition-metal-based short-chain perfluorocarboxylates (Mn-TFA and Ni-TFA) and systematically investigates their flame-retardant properties, aiming to develop efficient novel phosphorus-free flame retardants. The results of micromorphological characterization indicate that Mn-TFA forms a porous network structure, and Ni-TFA exhibits a polyhedral morphology, both of which possess distinct crystallinity attributed to the coordination interaction between metal ions and carboxylate groups. Flame-retardant performance evaluation demonstrates that samples display excellent flame-retardant effects: their flame-retardant performance is significantly superior to that of ammonium dihydrogen phosphate (the core active component of commercial flame retardants) at all tested concentrations. Particularly under medium-concentration loading conditions, the flame-retardant paper can achieve a self-extinguishing effect. The results of TG-IR-MS combined analysis show that the generation rates of CO and CO2 in the fuel system are significantly accelerated under the action of the flame retardants, indicating that the flame-retardant process is dominated by the condensed-phase effect.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Shan Yue,Jiayi Gao,Hui Kan,Ting Zhang,Xiangdong Ma,Rui Liu,Mingjing Zhao,Xiaohong Xia
Modulating the electrocatalytic interface is key to efficiently converting 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA). Herein, a NiCo( OH ) x /NiCoMoO 4 heterojunction electrocatalyst is constructed. The high-valence Mo 6+ substrate acts as an electron regulator, creating electron-deficient Ni sites and promoting the formation of active Ni 3+ species for HMF oxidation. Operando analysis and distribution of relaxation times (DRT) studies confirm that the Mo 6+ substrate enhances charge transfer and mass transport. This special electronic structure directs selective aldehyde group activation, steering the reaction along the HMFCA pathway. The obtained catalyst achieves a 91.4% FDCA yield with 96% Faradaic efficiency at 1.4 V vs. RHE. This work demonstrates a dual modulation strategy via high oxidation state substrate for efficient biomass conversion.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Ting Xiao,Fozia Sultana,Xiaojing Liu,Yu Duan,Renkun Li,Kexin Sun,Tongtong Li,Renhong Li
Exploiting low-crystallinity as a structural feature offers a powerful route to unlock new catalytic functionalities by maximizing defect density, tuning electronic structures, and facilitating rapid charge transfer. Moreover, the disordered catalysts are prone to electrochemical reconstruction, generating highly active oxyhydroxide species, thus promoting the catalytic activity. Here, we first prepare a low-crystallinity Ni(OH) 2 /FeOOH heterojunction pre-catalyst directly grown on nickel foam via electrodeposition, followed by electrochemical reconstruction to synthesize the final electrocatalyst with surface-enriched Ni-Fe oxyhydroxide species (ER-Ni(OH) 2 /FeOOH). The defect-rich structure synergistically couples Ni and Fe species, enabling an exceptionally low overpotential of 241 mV at 100 mA cm −2 for the alkaline oxygen evolution reaction (OER), while maintaining stable operation for over 40 h. The density functional theory (DFT) calculations confirm that the low-crystallinity heterointerface tunes the electronic structure and lowers the energy barrier for the rate-determining (RDS) *OH→*O step, thus providing a theoretical basis for the observed enhancement in OER activity. This work underscores the potential of low-crystallinity interface engineering as a powerful approach for constructing next-generation OER catalysts.
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RSC Advances
·
2026
·Vol. 16
·期 12
·10761
·
IF 6.1
Wenbin Jia,Pengju Wu,Chao Wu,Meng Yang,Ying Wu
Developing highly efficient and stable selenium-doped transition metal bimetallic catalysts to replace precious metal electrocatalysts for the alkaline oxygen evolution reaction (OER) remains an ongoing challenge. This paper reported the synthesis of a highly efficient redox-active selenium-doped bimetallic composite catalyst (Se–CoNi@NCNTs) via a one-step pyrolysis method using cobalt-nickel and g-C 3 N 4 as precursors. The Se–CoNi@NCNTs catalyst delivered a current density of 10 mA cm −2 at a low overpotential of merely 289 mV. Furthermore, in a 1 M KOH solution, the Tafel slope for electron transfer kinetics was determined to be 66.94 mV dec −1 . It exhibited excellent stability during 100 h of alkaline overcurrent operation, with negligible electrocatalytic current density loss during 100 h of continuous electrolysis. Enhanced electrochemical performance was observed in 1 M KOH + 0.33 M urea electrolyte, requiring only a low overpotential of 98 mV to deliver a current density of 10 mA cm −2 . Utilizing in situ catalysis of g-C 3 N 4 precursors with metallic nanoparticles to generate nitrogen-doped carbon nanotubes (NCNTs) endows the composite CoNiSe compound with high intrinsic activity and conductivity, enabling highly efficient water oxidation. Developing highly efficient and stable selenium-doped transition metal bimetallic catalysts to replace precious metal electrocatalysts for the alkaline oxygen evolution reaction (OER) remains an ongoing challenge.
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ACS Catalysis
·
2026
·
IF 13.1
Shengxiong Huang,Chunhao Wang,Guangmei Cao,Haijun Wu,Ping Zou,Shuxian Weng,Xia Jiang
Ni-loaded perovskite catalysts are one of the most promising catalytic materials for industrial applications and have received a great deal of attention in the field of steam reforming of biomass tar into hydrogen (H2). In this study, the Ni-LaFeO3 catalysts with different Ni coordination states were comparatively analyzed in terms of toluene steam-reforming performances. A significant correlation was found between support Ni (NiSup) ratio and H2 yield, with a NiSup ratio of 64.68% corresponding to the highest hydrogen yield of 171.35 mmol of H2/g of toluene (conversion rate of 93.88%). In-situ DRIFTS experiments and DFT calculations demonstrated that NiSup could promote the adsorption of toluene and the desorption of −COO*─a key intermediate of the rate-determining step─thereby enhancing catalytic activity and hydrogen yield. This finding confirms the effect of the Ni coordination state on catalytic activity and provides an important pathway for Ni-based perovskite catalyst design to support biomass-derived hydrogen production.
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