Journal of Energy Chemistry
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2025
·
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
·
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
·
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
·
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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高影响因子
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
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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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ChemSusChem
·
2025
·
IF 6.6
Muhammad Wasim,Muhammad Tayyab,Ali Arbab,Abdul Zeeshan Khan,Zulakha Zafar,Muhammad Arshad,Rida Javed,Maira Liaqat,Xian-Zhu Fu,Jing-Li Luo
Developing cost-effective, eco-friendly electrocatalysts with strong electrochemical performance is essential for advancing in water electrolysis. Noble metal-based catalysts offer excellent activity, but due to less availability and more expenses leads to an urgent demand for efficient, affordable, and earth-abundant alternatives. In this study, a bimetallic foam architecture (CuF@Ni) was fabricated by electrodeposition of Ni on CuF. This structure acts as both a conductive support and an active electrocatalyst. The synthesized CuF@Ni demonstrated superior HER activity and overpotential of 0.18 V at 50 mA/cm², while for MOR overpotential was observed 0.14 V at 50 mA/cm². CuF@Ni electrocatalytic electrode achieved a Faradaic efficiency ~100 %, with a formate (HCOO-) concentration of 7.9 mM during 150 C charge transfer. In a co-generation system integrating HER and MOR the onset potential was observed as lower 0.4 V and CuF@Ni required only 0.92 V to sustain the current density of 50 mA/cm², demonstrating significant energy savings. In addition, device consumes less power than theoretical water electrolysis under higher current density. Long-term stability tests confirmed minimal degradation under the harsh conditions. This study highlights CuF@Ni as a promising dual-functional electrocatalyst for efficient energy conversion for future renewable energy applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ruihan Li,Feng Hu,Ran Wu,Jianyi Xu,Jin Xu,Zhonghui Hou,Min Zhou,Junyu Bai,Yanghuan Zhang
In the present study, the synthesis of NdMg 12 + x wt%Ni( x = 0, 5, 10, 15) alloy was effectively accomplished through the technique of ball milling , and the profound impact of Ni on the microstructural attributes, as well as the hydrogen absorption and desorption characteristics of NdMg 12 alloy, was meticulously examined. The microstructural analysis reveals that Ni can notably facilitate the development of nanocrystalline and amorphous structural configurations. Subsequent investigations uncovered that a portion of Ni was transformed into the Mg 2 Ni phase on the surface of the NdMg 12 alloy, thereby increasing the number of hydrogen absorption active sites and subsequently enhancing the hydrogen absorption and desorption capabilities of the NdMg 12 +Ni alloy. A thermodynamic analysis reveals that the incorporation of Ni exerts a substantial elevating effect on the hydrogen desorption plateau pressure of NdMg 12 +Ni alloy. As the Ni content escalates from 0 wt% to 5 wt%, the enthalpy of the hydrogen desorption process plummets significantly, from 89.1888 kJ/mol H 2 to 80.2806 kJ/mol H 2 . Concurrently, the addition of Ni markedly diminishes the hysteresis coefficient during hydrogen absorption and desorption, thereby enhancing the overall hydrogen absorption and desorption efficiency of NdMg 12 +Ni alloy. Moreover, the inclusion of Ni not only expedites the hydrogen absorption rate within the NdMg 12 +Ni alloy but also substantially diminishes the activation energy for hydrogen desorption, effectively lowering the minimal hydrogen desorption temperature from 261℃ to 199℃. Notably, the NdMg 12 + 10 wt%Ni alloy exhibited the lowest activation energy (Ea = 114.4995 kJ/mol) and demonstrated superior hydrogen desorption kinetics.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jinyuan Dong,Silan Chen,Xiaotian Wang,Yuguang Mao,Xiaoxiao Jing,Zhixu Ouyang,Jiabao Ding,Jianjun Tian,Yujin Ji,Youyong Li,Wu-Jun Shi,Yang Han,Weifeng Zhang
Co3Sn2S2 (CSS) possesses robust surface states and high conductivity derived from Co atoms with Weyl points located only 60 meV above the Fermi level (Ef), revealing the probability of tuning the electronic band structure of CSS by doping with transition metal atoms. Here, Fe, Ni, and Cu atoms have been successfully incorporated into CSS, which turns out that the Fe0.1–CSS possesses better activity than CSS and IrO2 with an overpotential of 298 mV to reach the current density of 10 mA cm–2 and a Tafel slope of 358.3 mV dec–1 in 1 M KOH. The Fe0.1–CSS also shows better activity and stability than IrO2 as an anode for the anion exchange membrane water electrolyzer in 1 M KOH. Besides, the density functional theory results indicate that the band structure of CSS is adjusted by the incorporation of transition metal atoms, which is related to the regulation of Ef and thus the variation in electrolytic performance. Our findings provide a strategy to further engineer the activity of a topological semimetal, which provides a direction toward material design for catalysis and beyond.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhong Wang,Jinzhou Li,Shuang Yuan,Jinshuo Yang,Zhiqiang Jin,Xinjia Tan,Jie Dang,Wangzhong Mu,Guojian Li,Qiang Wang
FeCoNi-based high entropy intermetallic compounds are promising substitutes for noble metal catalysts for hydrogen evolution reaction (HER) and oxygen evolution (OER), while their activity is restricted by the synergistic effect between the elements. In this paper, the theoretical model of FeCoNiMnMoP bifunctional catalyst has been reasonably designed given the volcanic curve of M−H bond energy as a valuable guide for candidate metal elements. Theoretical calculations show that the synergistic effect between multiple sites not only accelerates the electron transfer but also reduces the rate-determining step (RDS) barrier. At the same time, the introduction of Mo also enhances the total density of states and reduces the d-band center, thus optimizing the adsorption and dissociation of intermediates. The experimental results confirm that the theoretical model has excellent catalytic performance. In the alkaline solution, FeCoNiMnMoP‖FeCoNiMnMoP requires only an ultra-low cell voltage of 1.49 V for overall water splitting when the current density is 10 mA cm −2 . In general, novel insights on the effects of intermetallic synergies on water decomposition are provided, which is helpful for the design of bifunctional catalysts based on volcanic diagrams.
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