Surfaces and Interfaces
·
2025
·
IF 6.3
Guang Yang,Jin Liang,Tian Lei,Yaxi Zhang,Li Zhang
Transition metal phosphides (TMPs) have emerged as promising candidates for the hydrogen evolution reaction (HER) due to their tunable phases and electronic structures. However, the development of bifunctional electrocatalysts that effectively balance HER and oxygen evolution reaction (OER) for overall water splitting presents a significant challenge. In this work, we report a novel cauliflower-like bimetallic phosphide, CoMo-P, synthesized on ZIF-67-derived NiCo layered double hydroxide (LDH) through a formic acid-assisted electrochemical phosphating process. This innovative approach not only enhances catalytic efficiency for both HER and OER but also offers a rapid, environmentally friendly, and straightforward fabrication method. The incorporation of formic acid during the electrodeposition process plays a crucial role in optimizing the catalyst's composition and microstructure. Specifically, formic acid facilitates the reduction rate of hypophosphite and stabilizes charged intermediates, thereby reducing the electrodeposition energy barrier and enhancing phosphating efficiency. As a result, the CoMo-P(NCL)/NF electrode demonstrates exceptional HER performance in alkaline media, achieving overpotentials of 55 mV and 108 mV at current densities of 10 and 50 mA cm ‑ 2 , respectively, significantly outperforming the control sample without formic acid addition (η 10 = 80.4 mV, η 50 = 142 mV). Moreover, the electrode exhibits remarkable OER activity with overpotentials of 273 mV and 310 mV at 10 and 50 mA cm ‑ 2 , respectively. When employed as a bifunctional catalyst for overall water splitting, the CoMo-P(NCL)/NF electrode pair requires a low cell voltage of 1.574 V to achieve a current density of 10 mA cm ‑ 2 , surpassing the performance of numerous reported bifunctional catalysts. This study provides a promising strategy for the rational design and practical application of high-performance bifunctional electrocatalysts in sustainable energy conversion systems.
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高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 12
·832
·
IF 5.3
Li Jiejun,Zhao Yixian,Huang Jiaxin,Wang Jiamin,Zhang Rongxia,Ni Meijun,Zhao Pengcheng,Fei Junjie,Xie Yixi
A highly sensitive electrochemical sensor for chlorogenic acid (CGA) detection has been developed using nitrogen-doped carbon nanorods loaded with NiCo bimetallic (NCNRs/NiCo). The composite material was synthesized through a pyrolysis strategy where NiCo-layered double hydroxide (LDH) was grown in situ on phenolic resin-derived carbon nanorods and subsequently carbonized. Material characterization confirmed the successful formation of uniformly dispersed NiCo nanoparticles anchored on nitrogen-doped carbon matrix, which provided abundant active sites. The NCNRs/NiCo-modified glassy carbon electrode (GCE) exhibited exceptional electrocatalytic activity toward CGA oxidation, achieving a wide linear detection range from 0.5 nM to 10 µM with an ultralow detection limit of 0.32 nM (S/ N = 3). The sensor demonstrated excellent selectivity against common interferents, good reproducibility and repeatability. Practical application in food samples showed satisfactory recoveries (97.6-104.1%) in good agreement with the ultraviolet-visible (UV-Vis) reference method. The outstanding performance originates from the synergistic effects between nitrogen-doped carbon framework and bimetallic nanoparticles, offering a promising platform for natural antioxidant determination in food quality control. Graphical
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chenying Zhang,Long Zhang,Qu Liu,Yinxuan Ding,Lingli Cheng,Minghong Wu,Zhen Li
Nickel–cobalt layered double hydroxides (NiCo-LDHs) are highly promising materials for energy storage electrodes. However, the poor conductivity and easy agglomeration limit their practical application. Herein, the novel hollow nanocage architecture of NiCo-LDH nanosheets (H-NiCo-LDH) decorated N-doped graphene quantum dots (N-GQDs) is constructed using zeolitic imidazolate framework-67 (ZIF-67) as self-sacrificed template. The hollow nanocage structure suppresses the agglomeration of nanosheets and enlarges the electrochemical interface, while the decoration of N-GQDs effectively improves electrical conductivity and provides more abundant active sites. More importantly, HRTEM characterization shows the construction of heterojunctions between H-NiCo-LDH and N-GQDs, and the interfacial charge redistribution through p-n heterojunction promotes interfacial electron transfer and enhances redox activity. Consequently, the N-GQD/H-NiCo-LDH electrode delivers a high specific capacitance of 2347 F g −1 (326 mA h g −1 ) at 1 A g −1 with excellent rate performance (82% capacitance retention at 10 A g −1 ). The assembled asymmetric supercapacitor by N-GQD/H-NiCo-LDH and active carbon exhibits an energy density of 52.1 W h kg −1 at a power density of 770 W kg −1 with remarkable cycling stability (80.5% capacitance retention after 5000 cycles). The hollow nanocage structure and enhanced electrical conductivity of N-GQDs make the N-GQD/H-NiCo-LDH a highly promising material for electrochemical energy storage applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuan He,Chengwei Sun,Shidong Fang,Muhammad Shaban,Changlun Chen
Layered double hydroxides (LDHs) have been served as potential pseudo-capacitive materials, especially for high-performance supercapacitors. However, the characteristics like limited capacitance, poor conductivity, and stability of LDHs severely confine their extensive applications for future energy-storage devices. It is urgent to seek a new and simple method to modify LDH materials, to improve its electrochemical performance and apply it to supercapacitors. Herein, a facile in-situ non-thermal plasma (NTP) treatment is conducted to modify NiCo-LDH nanowires for better electrochemical performance, resulting from the introduction of N-doping and oxygen vacancies by N 2 NTP. All these instructive synergies provide the optimum electrode (P-NiCoNW/CC-150) after the NTP treatment under the power of 150 W with outstanding capacitance performance of 4320 mF/cm 2 at 2 mA/cm 2 , and superior cycling stability along with capacitance retention of 117.3 %. Most importantly, an asymmetric supercapacitor device is assembled, employing P-NiCoNW/CC-150 and oxidized carbon cloth as cathode and anode electrodes respectively, exhibiting a particularly high energy density of 364 μWh/cm 2 when the power density is 4505 μW/cm 2 . This work confirms a feasible and green NTP method to synthesize high-performance electrodes for practical applications in future energy-storage devices but not limited to supercapacitors.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Manlin Zhu,Wangfeng Cai,Hongbo Wang,Leqiu He,Yan Wang
A morphologically adjustable metal-organic framework (MOF) template and a unique hierarchical structure show improved electrochemical performance of electrode materials for supercapacitors . Herein, Zn/Co-MOF-derived zinc-cobalt oxide/nickel cobalt layered double hydroxides (Zn-Co-O/NiCo-LDH) hierarchical core/shell nanostructures on nickel foam (NF) were synthesized by simple methods and exhibited high specific capacitance. The results showed that both the reasonable morphology of the MOF-templated continuous nanosheet network and synergy between transition bimetallic oxides and transition bimetallic hydroxide played an important role in improving the electrochemical properties . Hence, the as-prepared Zn-Co-O/NiCo-LDH battery-type electrode exhibited excellent specific capacitance of 2275.2 F/g at 1 A/g and remarkable cycling stability of 82.4% capacitance retention after 5000 cycles. Moreover, the as-prepared Zn-Co-O/NiCo-LDH was used as the positive electrode to assemble a hybrid supercapacitor (HSC) device, which attained a distinguished energy density of 44.5 W h/kg at a power density of 800 W/kg and satisfactory stability (71.5% retention after 5000 cycles). It was concluded that MOF-templated core/shell heterostructures in electrode materials have broad prospects and great potential for energy storage.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Jiuyun Cui,Qianqian Wang,Atian Xie,Jihui Lang,Zhiping Zhou,Yongsheng Yan
The development of superhydrophilic/underwater superoleophobic membrane is significant for purification of emulsified oily wastewater. However, low flux and membrane fouling still remains a challenge. Herein, a sisal-like structured hybrid membrane is prepared through in situ growth of nickel cobalt layered double hydroxide (NiCo-LDH) microcrystals on membrane surface for oil/water emulsion separation. The as-prepared hybrid membrane (CN@pDA@PVDF) exhibits low oil adhesion, outstanding antifouling performance and superhydrophilicity/underwater superoleophobicity. Under gravity driven, the separation experimental results demonstrate the as-prepared membrane can effective separate surfactant-free emulsion (SFE) and surfactant-stabilized emulsion (SSE) with separation efficiency of above 99.4%. Furthermore, with a simple and low cost approach, as well as the significantly enhanced performance, the as-prepared hybrid membrane has bright application prospective in wastewater treatment.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 10
·1-13
·
IF 5.3
Zhong Yu,Liao Ran,He Guowen,Liu Saiwen,Zhang Jin,Chen Chao
Cubic hollow-structured NiCo-LDH was synthesized using a solvothermal method. Subsequently, clay-like Ti 3 C 2 T x MXenes were electrostatically self-assembled with NiCo layered double hydroxides (NiCo-LDH) to form composites featuring three-dimensional porous heterostructures. The composites were characterized using SEM, TEM, XRD, XPS, and FT-IR spectroscopy. Ti 3 C 2 T x MXenes exhibit excellent electrical conductivity and hydrophilicity, providing abundant binding sites for NiCo-LDH, thereby promoting an increase in ion diffusion channels. The formation of three-dimensional porous heterostructural composites enhances charge transport, significantly improving sensor sensitivity and response speed. Consequently, the sensor demonstrates excellent electrochemical detection capability for quercetin (Qu), with a detection range of 0.1–20 µM and a detection limit of 23 nM. Additionally, it has been applied to the detection of Qu in natural plants such as onion, golden cypress, and chrysanthemum. The recovery ranged from 97.6 to 102.28%. Graphical Abstract
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Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 2
·1-15
·
IF 21.8
Zhao Weigang,Deng Jianping,Li Menghan,Du Guanben,Fan Mizi,Gao Haili,Yuan Zhanhui
In this study, tannin-derived porous carbon (TAC) with different microstructures was prepared via a microwave hydrothermal method, followed by KOH activation. Subsequently, the sea urchin–like NiCo-LDH/Tannin-derived carbon-based microsphere composite materials were rationally synthesized through a single-step microwave hydrothermal co-assembly process. The physicochemical characteristics and supercapacitive performance were systematically analyzed. TAC with a microspherical structure promoted and controlled the growth of LDHs, resulting in a more regular sea urchin–like structure, improved dispersibility, reduced resistance, and increased active sites. NiCo-LDH@TAC600-0 (without KOH activation) as an electrode material delivered a specific capacitance (Cs) of 1250 F g −1 at 1 A g −1 and 1035 F g −1 at 10 A g −1 , with a rate performance of 82.8%. The asymmetric supercapacitor device using NiCo-LDH@TAC600-0 and TAC provided an energy density of 30.8 Wh kg −1 at 800 W kg −1 and a capacitance retention rate of 72.5% after 5000 cycles. This study offers a novel approach to enhancing NiCo-LDH properties for efficient energy storage.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jiyuan Xiao,Jiatian Li,Shuai Yang,Mengjie Liu,Song Xue,Xiaofeng Liu,Miao Yu,Lili Li,Jisheng Wang,Bo Wen,Guorui Yang,Shujiang Ding
The development of efficient electromagnetic wave (EMW) absorbing materials relies on rational microstructures and loss mechanisms. This study innovatively proposes a design strategy based on micronano structural regulation─heterogeneous interface construction─synergistic loss optimization and fabricates a MoC@NiCo layered double hydroxide (LDH) composite material with a 3D chrysanthemum-like morphology. The petal-like microstructure enhances the multiple reflection and scattering effects of the incident EMWs, while heterogeneous interfaces further stimulate interface polarization. Meanwhile, density functional theory (DFT) guides the regulation of polarization and conduction loss synergy for efficient EMW energy attenuation. Experimental results show that the composite material, with a thickness of only 2.4 mm, has a minimum reflection loss (RLmin) of −57.9 dB, and an maximum effective absorption bandwidth (EABmax) covering 5.4 GHz, encompassing the entire C, X, and Ku frequency bands. Radar cross-sectional (RCS) testing further verifies the potential of the material to effectively attenuate EMWs in practical applications. This study provides theoretical basis and method guidance for the efficient design of absorbing materials through the synergistic regulation of polarization loss and conductivity loss and lays a theoretical foundation for the further design of EMW absorbing materials that meet more stringent practical application requirements.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xin Tang,Shan Zhao,Jiaying Wu,Zhiyuan He,Yu Zhang,Ke Huang,Zhirong Zou,Xiaoli Xiong
It is necessary to efficient detection hydrazine in food . Exploring highly sensitive, low-cost and fast response electrochemical hydrazine sensing methods has been a challenge in this field. In this paper, a conformal transformation method is used to prepare rose flower-like NiCo-LDH derivating from the bimetallic NiCo-MOFs, and the N 2 H 4 sensing platform with a large electrocatalytic area, high conductivity and good stability was constructed. Based on the synergy between Ni and Co and the remarkable catalytic activity of the rough 3D flower-like structure, the N 2 H 4 sensor has a linear response in the concentration range of 0.001–1 mmol/L and 1–7 mmol/L, with a sensitivity of 5342 μA L mmol −1 cm −2 and 2965 μA L mmol −1 cm −2 (S/N = 3), respectively, and low limit of detection of 0.043 μmol/L. This study opens a new door for the successful application of electrochemical sensors to detect N 2 H 4 in real food samples.
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 11
·2262-2268
·
IF 3.545
Jing He,Zhufeng Hu,Kuan Deng,Renjun Zhao,Xingbin Lv,Wen Tian,Yu Xin Zhang,Junyi Ji
A rational structural design of electrodes with high electron conductivity, sufficient material interfaces/defects and a regulated charge transfer pathway can be applied in broad practical electrochemical application fields. A triple-layered PPy@NiCo LDH/FeCo2O4 hybrid with a tri-metal hybrid nanowire and conductive PPy coating layer is fabricated via a one-step hydrothermal reaction and in situ polymerization. NiCo LDH/FeCo2O4 nanowire arrays with a layered crystalline structure are synthesized via an in situ dissolution-growth method, where the partially etched nickel foam substrate subsequently acts as the Ni source. The NiCo LDH/FeCo2O4 nanowire arrays together with the ultrathin PPy coating layer can form bi-continuous conductive networks, numerous crystalline edges and structural interfaces to increase the electron transfer rate and the active/adsorption sites, which can further promote the energy storage and electrocatalytic activity. The bi-functional PPy@NiFeCo/NF-4 electrode exhibits a high areal capacitance (9.24 F cm−2 at 5 mA cm−2) and excellent rate capability (90.5% retention from 5 to 30 mA cm−2) as a supercapacitor and achieves a small overpotential (244 mV at 50 mA cm−2) and Tafel slope (64.39 mV dec−1) as an electrocatalytic OER electrode.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Ning Song,Shihuan Hong,Mengya Xiao,Yan Zuo,Enhui Jiang,Chunmei Li,Hongjun Dong
The application of NiCo-LDHs in the hydrogen evolution reaction (HER) is rarely reported because it is usually served as an effective electrocatalyst for oxygen evolution reaction (OER) owing to the essential chemical and electric structure features. It still is a challenge to realize the effective HER over NiCo-LDHs unless modified with noble metals . In this work, the noble-metal-free core–shell Co(OH) 2 @P-NiCo-LDH hybrid with dodecahedral hierarchical structure is prepared by the sacrificial template method along with subsequent phosphating process, which is available for the electrocatalytic HER. The fabricated Co(Ni) δ+ -P δ- bonding states on the surface of outer shell NiCo-LDH not only provide the abundant active centers but also reduce interfacial charge transfer resistance to enhance the HER activity. Meanwhile, the unique core–shell dodecahedral structure effectively avoids the agglomeration and restacking of NiCo-LDH nanosheets to improve the electrochemical stability. This work exploits a novel noble-metal-free modification strategy to expand the application of NiCo-LDH in HER.
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