APPLIED SURFACE SCIENCE
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2025
·
IF 6.9
Xinkai Ding,Changtai Liu,Wenyang Huang,Yifan Zhou,Enzhu Hu,Kun Yu,Yong Xu,Kunhong Hu
Nickel-based alloy composites are high-temperature wear-resistant materials used in extreme environments such as nuclear reactors and aerospace engines. While offering excellent mechanical properties, their tribological performance under high temperatures requires significant enhancement. In this work, we present a sustainable approach utilizing biomass-derived onion-like carbon (OLC) to address this challenge. OLC was successfully synthesized through catalytic pyrolysis of rice husk ash (RHA) and incorporated into a nickel–chromium-molybdenum-titanium-aluminum alloy matrix via powder metallurgy, with different mass fractions (0-7 wt%). The composites were systematically evaluated using high-temperature micro-tribological tester, with post-test characterization performed by SEM/EDS and LSM. Results demonstrate that 3 wt% OLC represents an optimal concentration, enhancing hardness by 114 % and significantly improving interfacial bonding strength. During high-temperature friction, OLC particles facilitate pore-filling and interface optimization, subsequently forming both continuous carbon films and composite oxide layers (NiO, Cr 2 O 3 , Ni 3 C) that effectively isolate friction pairs. First-principles calculations reveal that OLC’s spherical nanostructure induces lower interfacial adhesion and reduced sliding energy barriers compared to conventional graphene. The combined experimental and theoretical approach establishes a comprehensive understanding of the multi-mode lubrication mechanism, highlighting OLC’s dual role in surface protection and wear-debris suppression. Our work provides valuable guidance for developing high-performance, sustainable nickel-based composites for demanding high-temperature applications.
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Journal of Energy Chemistry
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2025
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IF 14.9
Yingfeng Wu,Zhendong Luo,Yifan Yang,Jianhan Wu,Xiuquan Jia,Feng Wang
Nitrate synthesis is an important process for agriculture and industry, but suffers from energy-intensive steps including the synthesis and subsequent oxidation of ammonia. Herein, we present a selective N 2 transformation to nitrate by guiding the charge neutralization of self-electrified water microdroplets in an artificial cloud generated with the portable ultrasonic atomizer. The electron and ion transfer in the charge neutralization of water microdroplets on metal micromesh enables an up to ∼40-fold increase in the reactivity of nitrate formation reaction driven by ultrasonic energy. A robust semi-continuous N 2 oxidation by a Ni-mesh-screened cloud system was achieved, providing nitrate with ∼12 mM concentration every 20 h. These findings emphasize the potential of harnessing the microdroplet-mediated cloud electrochemistry of N 2 in decentralizing the current mass production of fertilizer.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
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IF 15.7
Gao Xiaoyue,Ben Teng
Chiral drugs are essential in modern medicine, but separating their enantiomers is challenging due to their similar physicochemical properties. However, traditional methods are often costly and inefficient. Here we show that chiral covalent organic framework (CCOF-300) membranes, induced by chiral dopants (L-( + )-/D-(–)-tartaric acid), can achieve high enantioselectivity in separating chiral drugs. Specifically, CCOF-300 membrane achieved 100% enantiomeric excess in separating racemic N-Fmoc-N’-[1-(4,4-Dimethyl–2,6-dioxocyclohexylidene)ethyl]-lysine (Fmoc-Lys(Dde)-OH). We found that size matching and differences in diffusion rates between enantiomers are key factors in chiral separation. Additionally, there were no significant differences in the binding energy between ibuprofen (IBU), Fmoc-Lys(Dde)-OH, and CCOF-300, indicating that binding energy is not the dominant factor in chiral separation. This study proposes a cost-effective and scalable method for chiral drug separation, highlighting the potential of chiral induction strategy in improving chiral separation technology in the pharmaceutical industry.
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FUEL
·
2025
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IF 7.5
Xin Zhang,Xiangyun Sun,Li Li,Xinli Zhang,Ao-Bing Wang,Huijuan Xu,Lijun Gao,Yaohui Gao,Hui Liu
Developing low-cost, highly efficient and stable non-noble metal-based electrocatalysts for the hydrogen evolution reaction (HER) is crucial for promoting large-scale alkaline water electrolysis. Here, we report a novel self-supporting Ni(OH) x /Mo-Ni 3 S 2 nanosheet heterostructure grown on nickel foam, demonstrating outstanding catalytic performance for alkaline HER. This heterostructure electrocatalyst exhibits an exceptionally low overpotential of just 33 mV at a current density of 10 mA cm −2 in 1 M KOH solution, surpassing commercial Pt/C catalyst. Moreover, it can operate continuously for 300 h at a high current density of around 130 mA cm −2 . Both experimental and theoretical calculations show that strong electronic coupling at the heterojunction interface optimizes the adsorption energy of molecular water and hydrogen on active sites, thereby enhancing the intrinsic activity. This work offers novel insights for designing high-performance alkaline HER electrocatalysts through coupling doping and heterostructure engineering.
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CHEMISTRY-A EUROPEAN JOURNAL
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2025
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IF 3.7
Yeheng Zhang,Tianwen Zheng,Hong Dai,Yinhua Jiang,Yuqiao Wang
Developing cost-effective oxygen evolution reaction (OER) catalysts for industrial current densities remains challenging, hindered by adsorbate evolution mechanism (AEM) scaling limitations and reconstruction instability. Here, we report a heterointerface-engineered Ni 3 S 2 /NiFeOOH catalyst formed via in-situ electrochemical reconstruction of Ni 3 S 2 /NiFe-LDH. Interfacial charge redistribution stabilizes high-valent Ni 3+ /Fe 3+ species and generates coordinatively unsaturated lattice oxygen sites, thereby activating the lattice oxygen mechanism (LOM). Combined operando spectroscopy, pH-dependent kinetics, and isotope labeling confirm LOM dominance. Further theoretical analyses reveal that the heterointerface downshifts the metal d -band center and upshifts the O 2p -band center, optimized intermediate adsorption free energy. Benefiting from the compatible multi-mechanism, the reconstructed catalyst demonstrates outstanding OER performance, only requires overpotentials of 196/305 mV to drive current densities of 10/1000 mA cm −2 in alkaline media, with robust stability for over 500 h. This work clarifies how interfacial electronic modulation connects pre-catalyst reconstruction to LOM activation, providing a scalable design strategy for high-current-density OER electrocatalysts. Graphical Upon electrochemical activation, Ni 3 S 2 /NiFe-LDH catalysts undergo transformation to Ni 3 S 2 /NiFeOOH. This structural reconstruction not only exposes additional catalytic active sites but also activates lattice oxygen species, thereby triggering the lattice oxygen reaction pathway. By circumventing the thermodynamic constraints inherent to the adsorbate mechanism, the reconstructed catalyst achieves a reduced overpotential, ultimately enhancing its oxygen evolution reaction (OER) catalytic performance.
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