MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Zhenting Zhao,Jiahua You,Yingru Ding,Haijuan Mei,Kai Li,Ke Li,Yongqing Chen,Weiping Gong
Blood glucose monitoring plays a critical role in diabetes diagnosis and management. This study presents a novel template-engaged strategy to fabricate NiCo 2 O 4 hollow microspheres (NiCo-HMs) through thermal conversion of bimetallic organic frameworks (NiCo-BTC) precursors. The hierarchical architecture of NiCo-HMs provides an enlarged specific surface area for enhanced molecular accessibility, abundant exposed active sites from the bimetal synergistic system, and optimized electron transfer pathways through the interconnected porous network. When engineered into a portable biosensor (NiCo-HMs/SPE) via Nafion-assisted immobilization on screen-printed electrodes, the device demonstrates exceptional glucose sensing characteristics, including wide linearity (1.0 μM-2.0 mM, R 2 = 0.998), high sensitivity (789.4 μA·mM −1 ·cm −2 ), rapid response (3.9 s)/recovery (6.4 s) kinetics, superior selectivity against common interferents, extended stability (90.0 % activity retention after 21 days). Practical validation was achieved through integration with a miniaturized potentiostat and smartphone interface, enabling real-time glucose tracking within ±15 % deviation thresholds. This MOF-derived hollow architecture provides new insights for developing next-generation wearable metabolic sensors.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1119
·
IF 3.9
Yinke Zhang,Lu Li,Zihan Shang,Hang Xu
In this study, nickel cobaltate (NiCo2O4) powders are employed as a catalyst in conjunction with persulfate for the development of a catalytic oxidation system to enhance fuel desulfurization. The hydrothermal synthesis conditions of NiCo2O4powders, which significantly influenced the desulfurization efficiency, were optimized using a response surface methodology with a Box–Behnken design. These conditions were ranked in the following order: calcination temperature > hydrothermal temperature > calcination time > hydrothermal time. Through the optimization process, the ideal preparation conditions were determined as follows: a hydrothermal temperature of 143 °C, hydrothermal time of 6.1 h, calcination temperature of 330 °C, and calcination time of 3.7 h. Under these optimized conditions, the predicted desulfurization rate was approximately 85.8%. The experimental results closely matched the prediction, yielding a desulfurization rate of around 84%, with a minimal error of only 2.1%. To characterize the NiCo2O4powders prepared under the optimal conditions, XRD, SEM, and TEM analyses were conducted. The analysis revealed that the microscopic morphology of NiCo2O4exhibited a rectangular sheet structure, with an average particle size of 20 nm. Additionally, fan-shaped NiCo2O4particles were observed as a result of linear and bundle agglomerations. Thus, this work is innovative in its ability to synthesize nano-catalysts using hydrothermal synthesis in a controllable manner and establishing a correlation between the hydrothermal synthesis conditions and catalytic activity.Keywords:response surface methodology;hydrothermal synthesis;nickel cobaltate;desulfurization;optimization
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Fanwei Meng,Chao Qu,Lanyang Wang,Decai Yang,Zezhong Zhao,Qing Ye
Photocatalytic CO 2 reduction technology plays a significant role in the energy and environmental sectors, highlighting the necessity for developing high-efficiency and stable catalysts. In this study, a novel photocatalyst, x NiCo 2 O 4 /CN ( x = 1, 3, and 5 wt%), was synthesized by depositing zeolitic imidazolate framework-67 (ZIF-67)-derived nickel cobaltate (NiCo 2 O 4 ) hollow nanocages onto porous graphitic carbon nitride ( g -C 3 N 4 , CN) nanosheets for photocatalytic CO 2 reduction. Under visible light irradiation, the resulting 3NiCo 2 O 4 /CN photocatalyst demonstrated exceptional CO yields of up to 2879.5 μmol g −1 h −1 , surpassing those of NiCo 2 O 4 and CN alone by factors of 3.3 and 11.6, respectively. The introduction of hollow NiCo 2 O 4 nanocages increased the specific surface area of the material and enhanced the number of active sites, while strengthening visible light absorption. The creation of a built-in electric field, induced by the Fermi level difference between the two materials, was confirmed through ultraviolet photoelectron spectroscopy (UPS) characterization. This resulted in the formation of a Z-scheme heterojunction, significantly enhancing the separation and migration of photogenerated charge carriers. Notably, 3NiCo 2 O 4 /CN exhibits excellent stability during long-term photocatalytic reactions, ensuring reliable performance for practical applications. This study offers novel insights and methodologies for developing efficient photocatalytic CO 2 reduction catalysts.
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PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Jinhong Wu,Xiaohan Sun,Haosen Chen,Siwei Guo,Dong Hou,Deyong Wang,Huihua Wang
Oxygen evolution reaction (OER) impedes the electrochemical water splitting for H2 production, ascribing to the depressed kinetics of the four proton-coupled transfer process. Transition metal oxides, especially bimetallic oxides, have been proven to be promising OER electrocatalysts due to their part unoccupied d-band characteristics. More interestingly, oxygen vacancies (Ov) easily constructed in transition metal oxides can modulate the electron structures and thereby boost the OER performance. However, most synthesized processes involving oxygen vacancy engineering, such as atom dopant, chemical/electrochemical reduction, and H2/Ar-dependent calcination, are energy-intensive and time-consuming, largely hampering their commercial applications. Herein, we suggest a simple and facile strategy for fabricating double spinel oxides with abundant oxygen vacancies by calcinating Ni/Fe@ZIF-67/CC precursor under a nonoxidation condition. The obtained Ov-CF1N2O@NC/CC-550 with vast oxygen vacancies exhibits excellent OER performance, representing a lower overpotential of 185 mV at 10 mA cm–2, smaller Tafel slope of 47.3 mV dec–1, as well as faster interface reaction kinetics (Rct = 0.7336). Theoretical calculations further confirm that the excellent electrochemical activity strongly corresponds to the lower d-band center of active sites on the Ov-CoFe2O4 (311) model and decreased reaction Gibbs energy barrier. The work might shed light on oxygen vacancy engineering via a simple and facile strategy and inspire a smart design of multimetallic oxide electrocatalysts with high OER performance.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 22
·10243-10252
·
IF 9.931
Xiaolong Guo,Tianxu Zheng,Guipeng Ji,Ning Hu,Chaohe Xu,Yuxin Zhang
Rechargeable zinc–air (Zn–air) batteries having high theoretical energy density are the most attractive energy technologies for future electric vehicles and flexible/wearable electronics. However, the serious lack of highly efficient and cost-effective oxygen electrocatalysts is one of the major obstacles for their future commercialization. Herein, we presented a core/shell design based on porous NiCo2O4 nanowires and ultrathin NiMn LDH nanosheets as an efficient method for the synthesis of electrocatalysts for rechargeable Zn–air batteries. Due to the large active surface area, rapid mass/charge transport, and high electron conductivity as well as unique structures, the core/shell NiCo2O4@NiMn LDH materials could deliver a rather low OER overpotential of 255 mV at 10.0 mA cm−2 while maintaining good stability in alkaline media. When these materials were further employed as air-cathode materials for Zn–air batteries, they exhibited an ultrahigh energy density (866 W h kg−1), superior reversibility (initial round-trip efficiency of 63.5%) and excellent stability (voltage gap increased by only about 20 mV after 500 cycles), which were much better than those of commercial Ir/C catalyst. Furthermore, the as-prepared flexible solid Zn–air battery also displayed very good mechanical properties, long cycle life and outstanding round-trip efficiency (70–74%).
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高影响因子
CARBON
·
2025
·
IF 11.6
Hongsheng Liang,Tian Hou,Tiancheng Liu,Shengchong Hui,Zhaoyang Hou,Zhen Wang,Bin Shi,Limin Zhang,Hao Shen,Hongjing Wu
Comprehensively understanding the role of interfacial engineering in tailoring dielectric response is essential for the development of next-generation electromagnetic wave (EMW) absorbers. Rare-earth oxides, with their flexible valence states and localized 4f orbitals, hold great potential to mediate interfacial charge transfer and polarization, yet the electromagnetic loss mechanisms underlying such effects remain unclear. Here, we demonstrate a rare-earth oxide–regulated interfacial engineering strategy, where the incorporation of CeO 2 into NiCo 2 O 4 constructs abundant heterointerfaces with dynamic valence states. Such CeO 2 -induced interfacial polarization markedly strengthens dielectric response and facilitates impedance matching, thereby surpassing the limitations of single-phase components. Dielectric analysis reveals that polarization loss dominates (>88 %) within the absorption band, while conduction loss plays a secondary role. The results show that interfacial charge redistribution driven by Ce 3+ /Ce 4+ redox flexibility, which creates abundant interfacial polarization centers and enhances relaxation. As a result, the optimized NiCo 2 O 4 /CeO 2 –T3 delivers outstanding EMW absorption, achieving a broad effective absorption bandwidth of 6.37 GHz at 2.00 mm and reflection loss of −60.09 dB at 2.20 mm (>99.99 % attenuation). This study establishes rare-earth oxide–enabled interfacial engineering as a powerful paradigm for amplifying interfacial polarization and guides the rational design of high-performance, lightweight EMW absorbers.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Xinying Han,Rui Wang,Shiyu Wang,Shuxia Guan,Meiyu Yang,Jiali Yang,Yutong Shan,Yang Zhao,Huan Wang
Developing highly sensitive sensors for toxic lead ion (Pb 2+ ) is critical for environmental safety. Herein, a porous hollow-sphere graphitic carbon nitride /NiCo 2 O 4 (phg-C 3 N 4 /NCO)composite was synthesized via hydrothermal-calcination to construct an electrochemical sensing platform. The unique hollow structure of phg-C 3 N 4 enhanced Pb 2+ adsorption via unsaturated nitrogen sites and pore confinement, while NCO nanosheets synergistically accelerated electron transfer through oxygen vacancies and redox pairs (Co 2+ /Co 3+ , Ni 2+ /Ni 3+ ). The composite-decorated glassy carbon electrode (GCE) achieved an ultrahigh sensitivity of 10.94 μA·μM −1 and a low detection limit of 0.010 μM (S/N=3) within the Pb 2+ concentration range of 0.1 μM−7.0 μM, surpassing single-component electrodes (NiO (2.33 μA·μM −1 ), Co 3 O 4 (2.52 μA·μM −1 ), NCO (5.11 μA·μM −1 ), or phg-C 3 N 4 (5.34 μA·μM −1 )) by 2.05−4.71 fold. The sensor exhibited exceptional selectivity against common interferents (Cd 2+ , Cu 2+ , Fe 2+ , Ni 2+ , Zn 2+ , Fe 3+ , phenol, humic acids) and reliable applicability in real water samples with 98.02−112.30% recovery. X-ray photoelectron spectroscopy (XPS) analysis confirmed the strong Pb 2+ adsorption and oxygen vacancy-mediated enhancement mechanism. This work provides a novel strategy for designing high-performance heavy metal ion sensors.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Rui Wang,Mingsheng Hao,Chao He,Zhengjun Tu,Fazheng Chong,Yinshi Li
In this work, a gradient-distributed NiCo 2 O 4 nanorod-composed graphite felt electrode (G-NiCo 2 O 4 -GF) was proposed and developed to achieve an ordered reaction toward the nonuniform mass transport in flow batteries. To this end, the ordered-nucleation hydrothermal method was designed, for which the NiCo 2 O 4 nanorod was grown concentrated in one side of electrode, and gradually decreased along the through-plane direction until hardly any in the other side. Theoretical calculating results indicated that the G-NiCo 2 O 4 -GF electrode yielded an obviously lower difference of local current density along through-plane direction, nearly one third of the uniformly-enhanced electrode. Flow battery assembled with the as-prepared electrode exhibited high energy efficiency (88.81 % at 100 mA cm −2 ), superior operation current density (500 mA cm −2 ), and long cycling stability (162 h, 200 cycles). This work provides an effective approach to develop the high-performance electrode for flow batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Xiumei Chen,Na Xin,Yuxin Li,Cong Sun,Longhua Li,Yulong Ying,Weidong Shi,Yu Liu
The energy storage device has been urgently studied and developed to meet the increasing demand for energy and sustainable development. Due to the excellent conductivity of graphene and high performance of ZnCo 2 O 4 and NiCo 2 O 4 , we design a self-supporting electrode based on vertically grown two-dimensional/two-dimensional (2D/2D) NiCo 2 O 4 /ZnCo 2 O 4 hierarchical flakes on the carbon-based conductive substrate (NiCo 2 O 4 /ZnCo 2 O 4 @graphene/carbon nanotubes, NZ@GC). The density functional theory calculations indicate that the high OH − adsorption capacity of the NiCo 2 O 4 /ZnCo 2 O 4 nanosheets can significantly enhance the electrochemical reaction activity. NZ@GC shows a high capacitance of 1128.6 F g −1 at 1 A g −1 . The capacitance retains 84.0% after 6000 cycles even at 10 A g −1 . A hybrid supercapacitor is fabricated using NZ@GC and activated carbon, exhibiting a large energy density of 50.8 W h kg −1 at the power density of 800 W kg −1 . After 9000 charge/discharge cycles, the supercapacitor still has 86.1% capacitance retention. The NZ@GC film has showed the potential as promising electrodes in high efficiency electrochemical energy storage devices.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yanqing Cong,Qiuyu Zheng,Wanxing Wang,Yi Zhang,Shi-Wen Lv
Exploring highly efficient electrocatalysts (OER) is critical for oxygen evolution reaction . Herein, for the first time, P-doped NiCo 2 O 4 nanosheet arrays generated on nickel foam (namely P–NiCo 2 O 4 /NF) were constructed via a feasible protocol. Notably, the etching treatment can open the internal structure of ZIF-67 to offer more electrocatalytically active surface area, and obtained NiCo 2 O 4 showed great electrocatalytic performance in OER. The introduction of P can effectively reduce the charge transfer resistance of NiCo 2 O 4 and boost OER kinetics. More importantly, doping P not only improved the hydrophilicity of NiCo 2 O 4 , but also reduced its surface potentials, which provided convenience for the adsorption of OH − over P–NiCo 2 O 4 /NF electrode. As expected, the P–NiCo 2 O 4 /NF electrode with good long-term durability displayed excellent performance for OER in alkaline solution, and an overpotential of 121.6 mV was achieved at a current density of 10 mA/cm 2 . To sum up, current work can provide a meaningful reference to prepare electrocatalyst for efficient OER.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Lizhong He,Zengpeng Guo,Najeeb ur Rehman Lashari,Gexi Wang,Mengbin Li
To cater to the mushrooming advanced energy storage devices need, designing and preparing novel electrode materials with excellent electrochemical properties (including high capacitance and prominent cycling stability) are urgent but challenging. Here, we successfully synthesized 3D hierarchical NiCo 2 O 4 @Co 3 S 4 @MnS@PPy (NC@CS@MS@PPy) core-sheath nanowire arrays grown on highly conductive carbon cloth using a multistage process. Owing to a lot of synergy between the multiple components in the as-obtained composite, the prepared electrode material indicates an excellent specific capacitance of 2.67 F cm −2 at 1 mA cm −2 or 2557.58 F g −1 at 1 A g −1 and high cycling stability (83.64 % capacitance retention after 20,000 cycles even at a high current density of 20 mA cm −2 ). When coupled with the activated carbon (AC, as a negative electrode), the assembled all-solid-state NC@CS@MS@PPy//AC asymmetric supercapacitor (ASC) device showed outstanding electrochemical properties with a high area specific capacitance 684.38 mF cm −2 at 3 mA cm −2 and better long-term cycling stability (96.76 % retention of the initial capacitance after 20,000 cycles). More importantly, by taking advantaging of the multiple compositional merits and structural features of the positive electrode , the device delivered the highest energy density of 81.1 Wh kg −1 at 800 W kg −1 and retained 26.2 Wh kg −1 at the highest power density of 16 KW kg −1 . Furthermore, two ASCs connected in series powered 20 red light-emitting diodes (LEDs) for >10 min. This work manifests that the prepared hierarchical NC@CS@MS@PPy core-sheath nanowire arrays have impressive potential as high-performance electrodes for supercapacitor.
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高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Zhaogen Zhu,Jinming Zhang,Xiaomin Peng,Yiyi Liu,Tianlun Cen,Zhifeng Ye,Dingsheng Yuan
Developing efficient bifunctional electrocatalysts with excellent oxygen reduction and evolution reaction (ORR/OER) activity to meet practical demands in Zn–air batteries (ZABs) is highly crucial and challenging. Herein, a simple hydrothermal one-step method is exploited to successfully synthesize Co3O4–NiCo2O4 anchored on N-doped reduced graphene oxide nanosheets (Co3O4–NiCo2O4/N-RGO). The active sites present in Co3O4–NiCo2O4/N-RGO and the synergy between N-RGO and Co3O4–NiCo2O4 accelerate the charge transfer and transport rate during the electrochemical course, which improves the ORR/OER activities of the Co3O4–NiCo2O4/N-RGO electrocatalyst. As expected, the Co3O4–NiCo2O4/N-RGO exhibits a better half-wave potential in the ORR and a lower Tafel slope during the OER process. A ZAB with optimal Co3O4–NiCo2O4/N-RGO as the cathode gives a higher open-circuit voltage (1.49 V), larger power density (97 mW cm–2), and better stability (180 h).
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高影响因子
危险品化学品经营许可证（带存储）