INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Yi Liu,Weiqi Sun,Zhicheng Yang,Ruoyang Zhang,Bin Li,Lixian Sun,Fen Xu,Wenwei Guo,Conglong Shi,Ting Yu,Zhengyi Liang,Qingjie He
Magnesium hydride (MgH 2 ), recognized as a promising alternative energy material to replace fossil fuels, possesses distinct advantages, including higher stability and hydrogen storage capacity. Nevertheless, its widespread application remains limits due to intrinsic drawbacks such as high thermodynamic stability and sluggish hydrogen adsorption-desorption kinetics. Coral-like NiO/NiFe 2 O 4 heterojunction catalysts were efficaciously synthesized through a conventional hydrothermal-calcination method in our work. These catalysts were subsequently ball-milled with MgH 2 to obtain the MgH 2 –NiO/NiFe 2 O 4 composite. A comprehensive series of hydrogen storage performance (HSP) evaluations demonstrated that the composite exhibits markedly enhanced hydrogen adsorption-desorption characteristics. Specifically, MgH 2 –NiO/NiFe 2 O 4 initiated hydrogen release at 188 °C, which represents a 133 °C decrease compared with ball-milled MgH 2 . At 275 °C, its composite released 6.2 wt% H 2 within 20 min, while at a hydrogen absorption temperature of 100 °C, it absorbed 4.4 wt% H 2 within 30 min. Besides, the composite dehydrogenation activation energy was declined to 86.97 kJ/mol, a decrease of 62.17 kJ/mol relative to ball-milled MgH 2 . Mechanistic investigations revealed that NiO/NiFe 2 O 4 underwent in situ transformation into Mg 2 Ni and FeO during hydrogen adsorption-desorption process. Simultaneously, the reversible “Mg 2 NiH 4 /Mg 2 Ni” phase functioned as hydrogen pump, thereby accelerating the kinetics. First-principles calculations further demonstrated that Fe atoms in the in situ-generated FeO acquired electrons from the MgH 2 interface, which weakened the Mg–H bonds and facilitated hydrogen desorption. This electronic modulation of MgH 2 effectively enhanced its hydrogen adsorption-desorption dynamics and substantially lowered hydrogen desorption activation energy. To sum up, our study reports successful preparation of a binary transition-metal heterojunction catalyst, NiO/NiFe 2 O 4 , derived from Ni and Fe. The outcomes offer new thoughts into design and classification of transition-metal-based catalysts for hydrogen storage applications.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
·
IF 8.7
Yunfeng Wang,Yingang Gui,Shasha He,Jiacheng Yang
In this study, through structural design, thin film doping modification, and electrode preparation, a high-performance triboelectric nanogenerator (TENG) has been achieved, and an electromagnetic generator is incorporated as an energy supplement to construct a self-powered sensing system for gas alarm and environmental monitoring. The high porosity of NiO derived from MOFs, high charge accumulation, and the high charge carrier mobility of N-MWCNTs promote charge capture and transfer, greatly enhancing the output performance of the triboelectric nanogenerator. Under the optimal doping ratio, the open-circuit voltage can reach 860 V, and the maximum short-circuit current up to 47 μA, sufficient to power 600 LEDs lights, achieving a power density of 10.45 W/m 2 . Meanwhile, MXene/Carbon/Ecoflex electrodes were fabricated to enhance the contact efficiency between the thin film and electrodes, further obtaining an open circuit voltage of 1020 V. This work provides a viable solution for the design of high-performance hybrid nanogenerators.
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APPLIED CATALYSIS A-GENERAL
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2026
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IF 4.8
Haodong Huang,Bo Chen,Zhiwei Zheng,Changyi Chen,Ruifeng Luo,Haijun Guo,Zhili Li,Xinde Chen
1,2-propanediol (1,2-PDO) and ethylene glycol (EG), as key precursors for high-value fine chemicals, represent one of the core challenges in green chemical engineering through the development of biomass-directed conversion systems. This study constructed a bifunctional x%NiO@Hβ-1%Pd hierarchical porous catalyst through an interfacial engineering strategy: utilizing the confinement effect of two-dimensional mesoporous nickel silicate nanosheets to load Ni onto Hβ zeolite, and anchored highly dispersed Pd nanoparticles on the NiO@Hβ surface through NaBH 4 -induced in situ reduction, systematically investigated the structure-activity relationship of this catalyst for sorbitol hydrogenolysis in Ca(OH) 2 alkaline aqueous systems. Combined NH 3 -TPD and N 2 adsorption-desorption characterization revealed that, the introduction of Hβ zeolite significantly modulated the catalyst acidity and pore structure—the total acid amount of 25%NiO@Hβ-1%Pd reached 4.13 mmol/g (representing a 104% enhancement compared to the support-free system), the desorption peak at 550°C corresponds to strong Lewis acid sites formed by Ni-O-Si bonds, the pore system with 69% mesopore content (BET specific surface area of 541.6 m 2 /g) provides efficient transport pathways for reactant diffusion. Mechanistic studies revealed that, the Brønsted acid sites of Hβ selectively adsorb sorbitol C-O bonds through hydrogen bonding interactions, while spillover hydrogen species at the Pd-Ni interface synergistically induce selective C-C bond cleavage in cooperation with strong Lewis acid sites, ultimately achieved a total diol carbon yield of 80.3 C% for 1,2-PDO/EG under conditions of 220°C and 3 MPa H 2 . This work provides new insights into the “acid-metal-mass transfer” ternary synergistic mechanism for precise hydrogenolysis of biomass polyols.
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SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Xiaoyang Cheng,Chen Wang,Biao Wang,Ruize Sun,Yingzhou Guan,Yanfeng Sun,Xishuang Liang,Peng Sun,Geyu Lu
In order to fabricate a high performance triple-phase-boundary (TPB) for a mixed potential type NO x sensor based on stabilized zirconia and oxide electrode, a porous surface of the yttria-stabilized-zirconia substrate (YSZ) was formed with pore-formers (PMMA, graphite and starch) using coating technique . SEM observation result indicated that the porous morphology in the final ceramic was related to the category and amount of the pore formers, so that the pore size and microstructure of YSZ layer could be controlled. The NO 2 gas sensors using above-mentioned modified YSZ substrate with porous surface and nano-structured NiO electrode were fabricated and evaluated. The electric potential difference (Δ V ) of the sensors varied almost linearly with the logarithm of NO 2 concentrations in the examined range of 10–500 ppm at 800 °C. The sensor based on 10 wt% starch-added YSZ matrix showed the largest response with the Δ V of 114 mV to 100 ppm NO 2 . It was also seen that the sensors showed good response-recovery transient, selectivity and repeatability to NO 2 .
研究领域:
材料科学
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传感器与传感技术
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电化学
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陶瓷材料
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环境监测
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Surfaces and Interfaces
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2026
·
IF 6
Roshni Rahman,Mingsheng Luo
NiO-loaded g-C₃N₄ photocatalysts (1.5–13.5 wt %) were successfully synthesized. • 5.5NiO/g-C₃N₄ achieved the highest activity with 98 % CR degradation in 1 h. • NiO incorporation shifted the CB from −0.58 V to −0.68 V, improving charge transfer. • Band gap decreased from 2.91 eV (GCN) to 2.80 eV (5.5NiO/GCN). • Co-contaminants (NaCl, Na₂SO₄) reduced degradation efficiency to 80-93 %. In this work, NiO with various mass percentages (1.5%, 3.5%, 5.5%, 7.5%, 9.5%, 13.5%) was loaded on GCN to improve the photocatalytic degradation of CR and BPA. Among all prepared samples, the 5.5NiO/GCN composite displayed the highest photocatalytic activity, achieving 98% degradation of CR and 91% degradation of BPA within 1 h. Mott-Schottky analysis revealed a conduction band potential of -0.58 V for pristine GCN and -0.68 V for the optimized 5.5NiO/GCN composite. Band gap energies obtained from the Tauc plot were 2.91 eV for GCN and 2.80 eV for 5.5NiO/GCN, confirming that NiO incorporation narrowed the band gap and enhanced photocatalytic properties. Furthermore, the influence of co-existing pollutants was also investigated. Inorganic salts (NaCl and Na₂SO₄) reduced degradation efficiencies to 93% for CR and 84% for BPA, whereas organic co-contaminants (PVA and acetone) decreased them to 80% and 77%, respectively, under identical conditions. Total organic carbon (TOC) analysis demonstrated 91% mineralization for CR and 87% for BPA over 1 h, indicating that the photocatalyst achieved significant mineralization, not just superficial degradation. Overall, these findings establish 5.5NiO/GCN as a highly efficient photocatalyst for both dye and organic pollutant removal and emphasize the critical role of co-contaminants in real wastewater scenarios. Download: Download high-res image (257KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Anfeng Zhu,Guodong Tang,Sanjun Zhi
An rGO-cellulose carbon aerogel with coupled Ni/NiO fibers and particles enables multiscale electromagnetic regulation. • A secondary redox calcination strategy constructs high aspect ratio Ni/NiO nanofibers with abundant heterointerfaces. • Interfacial polarization, defect dipoles and magnetic loss synergistically achieve impedance matching and attenuation. • Thickness-dependent absorption enables near full band microwave attenuation and effective RCS reduction. Electromagnetic wave–absorbing materials are critical for electromagnetic interference (EMI) suppression in electronic devices and stealth applications in military equipment. Herein, a structurally coupled three-dimensional C/Ni/NiO composite is fabricated by combining a graphene-reinforced cellulose-derived carbon aerogel with in situ generated fibrous Ni/NiO heterostructures. Freeze-casting and carbonization create an interleaved conductive lamellar framework, while secondary calcination induces anisotropic growth of high-aspect-ratio Ni/NiO fibers through redox-driven stress regulation. The resulting hierarchical heterointerfaces significantly enhance interfacial polarization, anisotropic magnetic loss, and multiple scattering, fostering effective synergy between dielectric and magnetic dissipation. With optimized composition, the composite exhibits a minimum reflection loss of −50.7 dB. Furthermore, thickness tunability facilitates near-full-band absorption, and significant radar cross-section (RCS) reduction is demonstrated across a wide range of incident angles. demonstrating the potential of structurally coupled 3D heterostructures for high-performance electromagnetic wave absorption. Download: Download high-res image (240KB) Download: Download full-size image The interconnected 3D carbon–magnetic architecture enables efficient microwave penetration and multiple internal reflections, while abundant C–Ni/NiO heterogeneous interfaces induce strong interfacial polarization, synergistically coupled with defect-dipolar dielectric loss and eddy current–dominated magnetic dissipation to achieve optimized impedance matching and rapid energy attenuation. Consequently, the optimized CNO-2 exhibits an ultralow RLmin_\text{min}min of −50.7 dB at a thickness of 2.52 mm with a broad effective absorption bandwidth of 3.84 GHz. In addition, pronounced radar cross-section reduction is sustained over wide incident angles, with the main-lobe RCS suppressed from 5.37 to −27.86 dB·m², highlighting the efficacy of this lightweight, low-loading structural–interfacial coupling strategy for high-performance microwave absorbers.
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ELECTROCHIMICA ACTA
·
2025
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IF 5.6
Liang Guo,Bingzhi Yan,Jiangrong Hou,Heya Zheng,Chuxiao Sun,Yanpei Xu,Qi Wang
Silicon, the most promising anode material for ultra-high specific capacity lithium-ion batteries, has been impeded from widespread use due to its large volume effects and limited electrical conductivity during cycling. In this study, we employed a facile one-step hydrothermal method to in-situ grow a Si@NiO core-shell structure on an MXene substrate, with the aim of optimizing its performance. The MXene substrate provides excellent electrical conductivity and structural stability; Si serves as the primary source of capacity contribution; NiO acts as an interlayer, bridging the substrate and the active material while mitigating the volume expansion of Si. This dual modification strategy, which targets both structure and interface, endows the Si anode with superior electrochemical performance. After 175 cycles at 0.1 A g −1 and 900 cycles at 1 A g −1 , the capacity of the electrode rose to 1530 m Ah g −1 and 1608 m Ah g −1 , Benefiting from the core-shell structure and optimized porous architecture, the electrode exhibits a volume expansion as low as 34 % after 900 cycles, effectively suppressing electrode pulverization failure caused by Si anode volume expansion. This study holds significant importance, as the simple and cost-effective one-step hydrothermal method also provides a reliable strategy for the commercial application of silicon anodes.
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ChemCatChem
·
2026
·Vol. 18
·期 5
·e70637
·
IF 4.1
Yintao Song,Hang Zheng,Mengyuan Huang,Quanwei Deng,Luhui Lin,Yaqi Shi,Jiacheng Li,Chenting Yang,Lu Lin,Changlong Wang,Xing Tang
We have developed a highly efficient and stable non-noble metal-based heterogeneous catalyst for the selective oxidation of HMF to DFF. Mixed oxide catalysts with different Mn/Ni molar ratios were synthesized using the urea precipitation method. The Mn 6.6 NiO X catalyst exhibited a 95.33% HMF conversion rate and a 99.39% DFF selectivity under the conditions of 110°C, 2 h, 1 MPa O 2 , and N,N -dimethylformamide. Experimental results indicate that the introduction of NiO can effectively regulate the crystal structure of MnO 2 , forming an amorphous Mn─O─Ni interface, which significantly increases the specific surface area (SSA) of the catalyst while reducing the binding energy of surface lattice oxygen (O L ), promoting the generation of oxygen vacancies (O V ), and thereby enhancing the adsorption and activation capabilities of O 2 . Combined adsorption experiments and kinetic analysis revealed that Ni species preferentially anchor the hydroxymethyl group in HMF molecules, enhancing reaction selectivity. Further experiments demonstrated that the Mn 6.6 NiO x catalyst, under certain conditions, could achieve an HMF conversion rate of 87.52% and a DFF selectivity of 85.81% even at a high substrate concentration of 10 wt% HMF.
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International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 2
·248-255
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IF 3.85
Ren Guoxing,Xiao Songwen,Liao Caibin,Liu Zhihong
As a part of the fundamental study related to the reduction smelting of spent lithium-ion batteries and ocean polymetallic nodules based on MnO-SiO 2 slags, this work investigated the activity coefficient of NiO in SiO 2 -saturated MnO-SiO 2 slag and Al 2 O 3 -saturated MnO-SiO 2 -Al 2 O 3 slag at 1623 K with controlled oxygen partial pressure levels of 10 −7 , 10 −6 , and 10 −5 Pa. Results showed that the solubility of nickel oxide in the slags increased with increasing oxygen partial pressure. The nickel in the MnO-SiO 2 slag and MnO-SiO 2 -Al 2 O 3 slag existed as NiO under experimental conditions. The addition of Al 2 O 3 in the MnO-SiO 2 slag decreased the dissolution of nickel in the slag and increased the activity coefficient of NiO. Furthermore, the activity coefficient of NiO ( γ NiO ), which is solid NiO, in the SiO 2 saturated MnO-SiO 2 slag and Al 2 O 3 saturated MnO-SiO 2 -Al 2 O 3 slag at 1623 K can be respectively calculated as γ NiO = 8.58 w (NiO) + 3.18 and γ NiO = 11.06 w (NiO) + 4.07, respectively, where w (NiO) is the NiO mass fraction in the slag.
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APPLIED CATALYSIS A-GENERAL
·
2021
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IF 5.706
Yichen Zhang,Shugui Hua,Xiaoqin Sun,Zhuoyue Liu,Yuan Dang,Liang Zhang,Yuanzhen Zhou
A sea urchin-like NiO/Co 3 O 4 composite cathode was synthesized by two-step hydrothermal in-situ growth method and a Fenton-like process inducing two-electron oxygen reduction reaction (ORR) was established to degrade levofloxacin (LEV) in this paper. NiO/Co 3 O 4 exhibited higher specific surface area and better electrical conductivity comparing with NiO or Co 3 O 4 , indicating an excellent synergistic effect between NiO and Co 3 O 4 . Moreover, NiO/Co 3 O 4 cathode could effectively degrade LEV wastewater, the removal efficiency could reach 77.8% after 120 min and the corresponding COD removal efficiency was 41.0%. Further studies showed that the effective conversion of Co(Ⅱ)/Co(Ⅲ) and Ni(Ⅱ)/Ni(Ⅲ) occurred on the electrode surface, which promoted the generation of •OH. Finally, a possible degradation pathway of LEV involved defluorination, deamination, demethylation and other processes was proposed. In short, the research could provide important reference for solving electrochemical problems related to electrocatalytic ORR and Fenton-like degradation of antibiotic wastewater.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 1
·442-456
·
IF 3.553
Ma Xiaoqing,Tang Kang-lai,Yang Mingyu,Shi Wenbing,Zhao Wenxi
Reliable determination of hydrogen peroxide (H 2 O 2 ) and glucose is vital in various fields, especially implicated in diagnosis of diabetes and oxidative stress-related diseases. Herein, yolk–shell hollow Ni/NiO@C microspheres were template-synthesized with well-defined Ni-MOF (metal–organic framework) and further worked as a bifunctional electrocatalyst for glucose oxidation in alkaline solution and H 2 O 2 reduction in neutral solution, of which the unique structure and rich pore openings provide large accessible surface areas, while the uniformly distributed Ni, NiO and C efficiently catalyze and facilitate the reaction of glucose and H 2 O 2 , thus achieving a wide linear range of 0.01 to 10 mM with a sensitivity of 1291 μA mM −1 cm −2 and a detection limit of 0.116 μM for glucose and offering a sensitivity of 32.09 μA mM −1 cm −2 , a detection limit of 0.9 μM and a linear range up to 80.7 mM for H 2 O 2 , as well as good selectivity, excellent reproducibility and long-term stability for two analytes. What’s more, the as-constructed sensors realize quantitative detection glucose in blood serum with satisfying results and can use to monitor H 2 O 2 in neutral situation. This work opens an avenue to design high-performance sensoring materials but also becomes a great candidate in practical application.
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ACS Applied Bio Materials
·
2020
·
IF 0
Qiumei Feng,Mengying Wang,Xiguang Han,Qian Chen,Baoting Dou,Po Wang
A critical challenge for improving the detection performance of sensors is building a favorable sensing interface. Herein, an innovative electrochemical biosensing system relying on hierarchical mesoporous NiO@N-doped C microspheres coupled with catalytic hairpin assembly was developed for DNA analysis. In this strategy, the utilization of NiO@N-doped C microspheres and multiwalled carbon nanotubes as electrode materials effectively enhanced the interfacial electron transfer and improved the surface active sites for subsequent reactions. By designing a target-assisted catalytic hairpin assembly, single target DNA could initiate the introduction of multiple signal probes labeled with ferrocene (Fc) onto a working electrode surface. Because the change in the Fc signal is dependent on the amount of target DNA, the resulting electrochemical sensing platform is highly sensitive. Under optimized reaction conditions, this testing platform has a wide linear range for target DNA detection from 100 aM to 100 pM with a detection limit of 45 aM. Furthermore, the platform displayed excellent selectivity, acceptable reproducibility, and long-term stability, highlighting the application potential of this sensing system.
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PubMed
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