CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xin Miao,Wenhao Fan,Shaoping Chen,Qiang Zhang,Decheng An,Zicheng Wang,Lifang Hu,Zuhair A. Munir,Chaochao Dun
Elemental diffusion and reactions at interfaces significantly increase resistivity and reduce stability, particularly in thermoelectric (TE) systems containing highly diffusive elements like Te. Using thermodynamically stable phases as contact layers have eliminated interfacial reactions but have not been able to completely stop elemental diffusion. This work introduces an innovative approach to effectively increase the activation energy of cross-interface atom diffusion by creating a continuously interfacial symmetric strain field via a high density of interfacial edge dislocations. Specifically, a dense interfacial strain barrier layer is constructed using Ni 0.5 Te as contact layer, resulting in an atomically continuous Te 0.985 Sb 0.015 /Ni 0.5 Te interface. This design achieves a notable reduction in contact resistivity to 9 μΩ cm 2 while maintaining more than 75 % of the theoretical device efficiency at a hot-end temperature, ( T h ) of 523 K even after 21,600 min of aging. This method of optimizing both the interfacial microstructure and chemical composition provides a new avenue for constructing stably high-performance heterostructure devices.
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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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Journal of Central South University
·
2025
·Vol. 32
·期 4
·1272-1283
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IF 4.4
Song Ren-hong,Hu Jing,Li Xiao,Guo Hao,Zhang Wen,Tian Qian-qiu,Hu Wen-bin
As a cathode material for thermal batteries, NiS 2 has a high theoretical capacity but low thermal stability. Besides, the poor formability of NiS 2 powders also restricts the cathode performance of thermal batteries. In this paper, the novel NiS 2 /SiO 2 composite material was developed by high temperature vulcanization to improve the thermal stability formability of NiS 2 . The good filling and lubrication of spherical SiO 2 can improve the thermal conductivity of NiS 2 electrode. The discharge test shows that the NiS 2 /SiO 2 cathode has a stable discharge voltage at a current density of 200 mA/cm 2 , and the activation time is shortened by nearly 20% compared with the NiS 2 cathode. In addition, due to the favorable thermal insulation protection of SiO 2 , the initial decomposition temperature of NiS 2 is increased by 30 °C after the addition of SiO 2 . The incorporation of SiO 2 not only effectively improves the thermal stability and electrochemical properties of NiS 2 , but also improves the cold pressing forming performance of the NiS 2 powder. Therefore, the novel NiS 2 /SiO 2 composite material is more suitable for thermal batteries with high stability and fast response, which is of great significance for improving the maneuverability and quality reliability of weapons and equipment.
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Small
·
2025
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IF 12.1
Lijuan Liu,Yingqiu Zheng,Wenshu Chen,Yongping Du,Linfeng Hu,Guoqiang Luo,Qiang Shen,Jian Zhang
Alkaline water electrolysis holds potential for large-scale, high-purity hydrogen production. However, the slow kinetics of water dissociation and challenging conditions in alkaline environments complicate the search for an electrocatalyst with both high activity and durability. In this study, a highly active and stable amorphous electrocatalyst is introduced, 3Ni─Co─S─O, developed via a straightforward electrodeposition method for alkaline hydrogen evolution reaction (HER). Notably, the surface of the 3Ni─Co─S─O catalyst undergoes a compositional reconstruction during alkaline HER, yet maintains its amorphous structure. This reconstruction spans roughly 6 µm, leading to a gradual decrease in Ni and S content and a corresponding increase in O concentration toward the surface, thereby forming a stable, gradient active layer. Benefitting from this layer and its amorphous nature, the 3Ni─Co─S─O catalyst demonstrates superior alkaline HER activity—requiring only 170 mV to achieve an industrial HER current density of 1000 mA cm −2 . It also showcases remarkable stability, with a mere 15 mV increase in overpotential during continuous HER at 300 mA cm −2 for 24 h, outperforming the commercial Pt/C catalyst. The research provides a novel approach to designing high-performance amorphous alkaline HER electrocatalysts cost-effectively and contributes insights for understanding and developing advanced amorphous catalysts across various 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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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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Fundamental Research
·
2025
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IF 6.3
Zhong Wang,Tuo Zang,Ye Ziyu,Siyuan Zhang,Guojian Li,Xiaoming Liu,Qiang Wang,Shuang Yuan
Precise anchoring and high-density utilization of platinum single atoms (Pt SA ) remain critical challenges in advancing efficient hydrogen production via water electrolysis. Here, we present an innovative magnetic-field-assisted electrodeposition strategy for the controllable synthesis of high-density Pt SA on two-dimensional MXene substrates. Application of a 0.6 T magnetic field significantly enhanced Pt SA deposition kinetics, yielding a 2.1-fold increase in the deposition rate. Numerical simulations confirmed that magnetohydrodynamic (MHD) effects induced by the magnetic field were the primary mechanism driving this enhanced deposition efficiency. The optimized Pt SA -0.6@MXene/NF catalyst exhibited outstanding hydrogen evolution reaction (HER) performance in 1 M KOH, achieving an ultralow overpotential of 12 mV at 10 mA cm −2 , along with a Tafel slope of 29 mV dec −1 . Notably, the catalyst demonstrated 66.1-fold higher Pt mass activity (3458.7 A g −1 ) compared to commercial Pt/C (52.3 A g −1 ) at a 50 mV overpotential. Density functional theory (DFT) calculations revealed that the high-density Pt SA configuration synergistically enhances MXene's electrical conductivity while lowering the d-band center, thereby optimizing the energy barrier for hydrogen intermediate (H*) adsorption. This work provides a novel strategy for regulating the magnetic-field-assisted deposition of Pt SA catalysts, offering a new avenue for designing high-performance water electrolysis catalysts.
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APPLIED SURFACE SCIENCE
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2025
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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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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 42
·425601
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IF 2.8
Jie Jiang,Shikai An,Buruli Dulaiti,Huilin Song,Shuqiang Li,Xiaoyan Zhang,Tongwei Han
A novel ternary nanostructure comprising a two-dimensional nanosheet, polymer carbon material, and transition metal nanoparticle was developed for supercapacitor applications. The MoS2/PZSC/Fe3O4 composite was synthesized and carbonized through in-situ growth of poly(cyclotriphosphazene-co-4,4’-sulfonyldiphenol) Polyphosphazene (PZS) and ferroferric oxide (Fe3O4) onto Molybdenum disulfide (MoS2) layers. This composite effectively combines the individual advantages of each constituent. The pseudocapacitive performance of MoS2/PZSC/Fe3O4 was thoroughly evaluated, revealing a maximum specific capacitance of 433.3 F g−1 at a current density of 2 A g−1. Furthermore, an asymmetric supercapacitor was assembled using MoS2/PZSC/Fe3O4 as the negative electrode, achieving an energy density of 25.6 Wh kg−1 at a power density of 400 W kg−1, with good cycling stability. These results highlight the significant potential of MoS2/PZSC/Fe3O4 as a promising material for supercapacitor applications.
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ENERGY & FUELS
·
2025
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IF 5.3
Yunyun Xie,Guanghua Liu,Zongwang Rao,Zhifang Xu,Jun Zhu,Chao Jiang,Yulong Yang,Zhiwen Hu,Qibing Chang
Fabricating an inexpensive and efficient electrocatalyst for the electrocatalytic oxygen evolution reaction (OER) in an alkaline medium is crucial for renewable energy generation. In this work, nickel foam (NF) modified with few-layer or single-layer MXene (S-MXene) was used as a substrate to prepare an independent, self-supporting composite electrode for oxygen evolution reaction (OER) catalysis. CoFe bimetallic MOF nanosheets were grown in situ on composite substrates by electrodeposition. Compared to multilayer MXene, S-MXene has a larger specific surface area and interlayer spacing, making it an ideal material for enhancing the conductivity of the electrode or serving as a supporting matrix. As an intermediate material, S-MXene can not only reduce the charge transfer resistance of the electrode and improve the active sites but also enhance the structural stability of the electrode, significantly improving the catalytic activity and long-term electrolysis stability of the electrode. The improved CoFe NSs@S-MXene/NF composite electrode delivers a current density of 10 mA cm–2 at a low overpotential value of only 191 mV in 1.0 M KOH, along with an ultralow Tafel slope of 31 mV dec–1. Additionally, the composite electrode exhibits outstanding stability for 24 h during OER at various current densities. This work innovatively uses S-MXene as a base material and develops a highly efficient new type of OER electrode. This novel strategy can serve as a reference for the modification of other electrode materials and expand the application of MXene in the field of water splitting.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xueqi Zhang,Shichao Chen,Kang Wang,Zhongli Tang,Xitao Wang
The preparation of non-precious metal catalysts employed in oxygen evolution reaction (OER) is of great important for hydrogen production via electrocatalytic water splitting. In this work, a 2D/2D CoFe LDH/MOF heterostructure was constructed on nickel foam (NF) by in-situ partial conversion of CoFe MOF to CoFe LDH, and evaluated as an effective OER catalyst. Owing to the unique 2D/2D heterostructure, substantial electrochemical active surface area (ECSA), superior electron conductivity, accelerated mass/charge transfer kinetics and synergistic effect between the two materials, LDH/MOF-6 h sample combining structural features of both MOF and LDH exhibited a lowest overpotential of 257 mV, a small Tafel slope of 50.71 mV·dec ‑1 at 20 mA cm -2 current density, along with a highest ECSA of 108 cm 2 (27,000 cm 2 g -1 ). Moreover, LDH/MOF-6 h sample demonstrated superior stability over 100 h of continuous reaction in alkaline electrolyte, which indicates that 2D/2D CoFe LDH/MOF heterostructure is a highly future-oriented material for OER applications.
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DESALINATION
·
2025
·
IF 9.8
Baochuan Qi,Yu Li,Huaili Zheng,Wanying Xie,Li Li,Zhiwei Zhao
Membrane capacitive deionization (MCDI) shows potential for brackish water desalination, but is limited by inefficient electrode materials. We developed a porous carbon electrode by co-pyrolyzing exhausted reverse osmosis membranes (EROM) with organic potassium salts (PIPES-K2). Our findings show that the PIPES-K2 doping ratio impacts desalination performance more than the co-pyrolysis temperature. At a 3:1 PIPES-K2-to-EROM ratio, the NS-EROMC3 electrode achieved a salt adsorption capacity (SAC) of 32.76 mg g −1 , showing the highest performance. Surface analysis confirmed that interconnected hierarchical pores and defective edge-N/S sites in NS-EROMC3 were key to its efficiency. NS-EROMC3 demonstrated exceptional cycling stability (< 20 % capacity loss over 60 cycles) and adaptability to diluted saline-alkali soil drainage. In situ Raman and Density Functional Theory (DFT) calculations attributed this performance to carbon vacancies and enriched edge-N/S defects. The PIPES-K2 co-pyrolysis strategy was extended to other carbon precursors. This study provides a scalable method for producing high-performance MCDI electrodes while repurposing wasteful resources.
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