ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Qianfeng Pan,Fenghua Zheng,Dingfei Deng,Bo Chen,Yang Wang
The transition metal-based layered double hydroxides (LDHs) have been extensively studied as promising functional nanomaterials owing to their excellent electrochemical activity and tunable chemical composition. In this work, using acetate anions (Ac–) as intercalating elements, the NiCo-LDH nanosheets arraying on Ni foam with different amounts of Ac– anion intercalation or volume of hydrothermal solution were prepared by a simple hydrothermal method. The optimized amount of Ac– anions expanded the interlayer space of LDH nanosheets from 0.8 to 0.94 nm. An ultrahigh specific capacity of 1200 C g–1 at 1 A g–1 (690 C g–1 without Ac– anions), an outstanding rate capability of 72.5% at 30 A g–1, and a cycle stability of 79.90% after 4500 cycles were mainly attributed to the higher interlayer spacing of Ac– anion intercalation. The enlarged interlayer spacing was beneficial for stabilizing the α-phase of LDHs and accelerating the electron transport and electrolyte penetration in the electrochemical reaction. This work sheds light on the mechanisms of the interlayer spacing regulation of NiCo-LDH nanosheets and offers a promising strategy to synthesize functional nanomaterials with excellent electrochemical performance via integrating their unique layered structure and interlayer anion exchange characteristics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
·
IF 9.6
Rui Li,Jing Zhang,Chao Han,Qianyu Wang,Wei Meng,Guangyue Li
Rare-earth ion-doped selenides hold great promise for electrocatalysis owing to their abundant active sites, high stability, and excellent electron transport capability. However, the controllable incorporation of rare-earth ions into selenides remains challenging. Conventional one-pot routes, in which rare-earth ions are directly introduced during selenide synthesis, often suffer from uncontrollable morphology and structure, severely limiting their electrocatalytic performance. Herein, a facile rare-earth pre-doping strategy based on nickel cobalt layered double hydroxide (NiCo-LDH) was proposed, in which rare-earth ions were first incorporated into NiCo-LDH templates and subsequently converted into rare-earth-doped selenides of n - M -NiCoSe 2 ( n = 0.2, 0.4, 0.6, 0.8; M = Ce, La, Sm) on nickel foam (NF) via high-temperature selenization. By tuning the type and dosage of the rare-earth dopants, the catalytic activity of the selenides toward the hydrogen evolution reaction (HER) was effectively regulated. Among all the doped samples, 0.6-Ce-NiCoSe 2 /NF delivered the best HER performance, requiring an overpotential of only 123 ± 3.0 mV to reach the current density of 10 mA·cm −2 with a Tafel slope of 44.6 mV·dec −1 . Theoretical calculations revealed that Ce doping induced charge redistribution in NiCoSe 2 , which optimized the H ⁎ adsorption strength at the Ni, Co and Se sites, while the Ce sites also served as additional active sites with near-thermoneutral H ⁎ adsorption free energy, achieving the most balanced optimization among the three rare-earth-doped systems. Moreover, 0.6-Ce-NiCoSe 2 /NF exhibited favorable oxygen evolution reaction activity. This work demonstrates that the rare-earth pre-doping strategy based on NiCo-LDH templates provides a feasible route to rare-earth-doped selenides, and the dopant type and dosage play a decisive role in regulating their electrocatalytic activities. Download: Download high-res image (161KB) Download: Download full-size image
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Ping Bai,Junyu Lang,Song Wang,Haojie Tong,Wenling Du,Zhanli Chai
The elaborate modulation of charge transfer in Z-scheme heterojunctions is of significant importance yet poses a formidable challenge for achieving efficient photocatalytic hydrogen production . The present study reports the fabrication of ZnCdS nanoparticle wrapped by NiCo-layered double hydroxide with enriched oxygen vacancies (ZCS@LDH-O v ) was fabricated, which exhibits enhanced interfacial binding and internal electric field (IEF) in comparison to ZCS@LDH. Under visible-light irradiation, the as-prepared ZCS@LDH-O v exhibits a superior photocatalytic H 2 production rate of up to 2.68 mmol·g −1 ·h −1 , which is approximately 9.24-fold and 2.68-fold of the pristine ZnCdS and ZCS@LDH, respectively. The stability of the photocatalyst after 5 cycles is obviously enhanced, with ZCS@LDH exhibiting a remaining hydrogen evolution reaction (HER) rate of 52.7 % and ZCS@LDH-O v demonstrating an impressive remaining rate of 98.2 %. The Z-scheme facilitates rapid charge transfer and efficient separation, thereby enhancing the catalytic activity for HER. The excellent recyclability of ZCS@LDH-O v is primarily attributed to enhanced photo-corrosion resistance of ZnCdS, which can be ascribed to the efficient transfer of photo-generated holes through a rapid interfacial charge pathway.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Chenglong Liu,Jiacheng Jin,Fan Dong,Zhipeng Zhang,Daolin Zhou,Mingxin Jin,Haohao Wan,Min Shao,Yushan Wan
This article aims at preparing of Z-scheme heterojunction NiCo-LDH/Bi 2 WO 6 (LDH: layered double hydroxides) via a solvothermal technique, addressing the rapid recombination of electron-hole pairs caused by the narrow bandgap of Bi 2 WO 6 . Successful loading of NiCo-LDH onto Bi 2 WO 6 was confirmed through various characterization techniques, assessing the composite's crystal structure, morphological traits, and performance. Notably, the NiCo-LDH/Bi 2 WO 6 composite exhibited excellent photocatalytic performance in the degradation of tetracycline (TC), achieving an optimal reaction rate of 0.03 min −1 , which is 4.8 times faster than that of Bi 2 WO 6 alone. The findings demonstrate that the formation of the heterojunction structure facilitated the separation of photogenerated electron-hole pairs by reducing recombination in monomers. Free radical trapping experiments showcased that the decomposition of TC is primarily driven by h + and ∙O 2 − . Additionally, liquid chromatography-mass spectrometry analysis identified the degradation products of TC and suggested two potential degradation pathways. The present research provides a novel approach for preparing LDH photocatalytic materials using NiCo-LDH/Bi 2 WO 6 .
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Rongxin Chen,Xiaoyi Cai,Xinyu He,Xianyong Hong,Yunfan Liu,Jin-Kyu So,Benquan Wang,Yang Zhou,Li Cheng,Ze Xiang Shen
The rapidly growing market of portable and wearable smart electronics has created strong interest in flexible electrode materials with high specific capacitance and fast charging/discharging properties. However, high mass-specific capacitance active materials are often limited by the low areal mass-loading required. High areal capacity electrodes can make more efficient use of the limited internal space of these miniature devices by minimizing the volume and weight taken by current collectors and separators. Herein, a method is proposed to prepare a nickel–cobalt layered double hydroxide binder-free cathode on flexible carbon cloth with a mass loading of 20 mg cm −2 . This core–shell hybrid structure prepared using a MOF self-sacrificing template, achieves a high energy density using thick electrodes while improving their slow kinetics by enhancing both the ion diffusion process and charge transfer dynamics. The areal capacitance reaches a staggering 4.42 mAh cm −2 (31.79 F cm −2 ) at a current density of 8 mA cm −2 . Furthermore, a one-step hydrothermal method to prepare the FeNi-S anode (1.67 mAh cm −2 , 2 mA cm −2 ) is proposed. Upon assembling with the gel electrolyte, this flexible device possesses an impressive energy density of 3.29 mW h cm −2 (3 mW cm −2 ). It can readily supply energy to watches, wireless e-paper, LEDs, and can be anticipated to be widely used in next-generation high-performance portable and wearable devices.
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WOOD SCIENCE AND TECHNOLOGY
·
2026
·Vol. 60
·期 2
·30
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IF 3
Yu Ting,Zhang Peiyuan,Chen Jiekai,Zhang Jiawei,Chen Lihui,Huang Liulian,Wu Hui,Zhou Xiaxing
Amid worsening energy shortages, the demand for clean energy and high-performance energy storage devices has surged, driving significant research interest in supercapacitor electrode materials. This study pioneered a novel hierarchical composite architecture integrating ball-milled Melaleuca bark-derived activated carbon (BAC) with nickel-cobalt layered double hydroxide (Ni-Co LDH) via a facile solvothermal method. Systematic optimization of synthesis parameters including the Ni: Co molar ratio, solvothermal reaction temperature/duration, and the BAC to NiCo-LDH mass ratio unveiled that controlled conditions induced a distinctive urchin-like spherical morphology, where vertically-aligned LDH microspheres uniformly anchor onto the porous BAC scaffold. This unique structure fosters a synergistic dual-function: BAC serves as a conductive backbone that mitigates LDH aggregation and enhances ion transport kinetics, while Ni₃Co₆-LDH delivers robust pseudocapacitance. Crucially, the optimal BAC/Ni 3 Co 6 composite achieved a remarkable specific capacitance of 587.5 F g − 1 , surpassing pristine BAC and Ni₃Co₆-LDH by 101.2% and 79.0%, respectively. Furthermore, the assembled asymmetric supercapacitor device demonstrated exceptional cycling stability, maintaining 99.7% coulombic efficiency after 6000 charge-discharge cycles. This work not only valorizes Melaleuca bark as a sustainable precursor for high-performance carbon materials but also establishes a rational design paradigm for engineering advanced biomass-derived composite electrodes.
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MATERIALS RESEARCH BULLETIN
·
2026
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IF 5.8
Qian Cheng,Xiaohua Wu,Yu Li,Xiaobo Yang,Zaixin Xie,Zhuoqi Duan,Yongmao Hu
Biomass of water hyacinth (WH) is a promising carbon precursor. • The synergistic effect of NiCo-LDH and WH carbon was used for energy storage. • Oxygen vacancies significantly improved the electrode’s energy storage capability. Water hyacinth , an aquatic plant prone to overgrowth, typically thrives in stagnant marshes, lakes, reservoirs, and rivers. It can disrupt aquatic ecosystems and clog waterways, increasing governance costs. This study developed an in situ growth method to grow NiCo-LDH on water hyacinth -derived carbon frameworks for sustainable, high-performance supercapacitors. Specifically, NiCo-LDH nanosheets were first grown in situ on activated water hyacinth -derived hierarchical porous carbon (AWHC), followed by NaBH 4 treatment to introduce oxygen vacancies, thereby achieving synergistic optimization. The optimal ov-NiCo-LDH@AWHC electrode, with a NiCo-LDH:AWHC mass ratio of 6:2, exhibited a specific capacitance of 3032 F g −1 at 1 A g −1 and an 82.05% retention after 10,000 galvanostatic discharge-charge (GCD) cycles at 10 A g −1 . Intriguingly, the asymmetric supercapacitor, ov-NiCo-LDH@AWHC-2//AWHC, delivered 74.97 Wh kg −1 at 734.7 W kg −1 , with 84.77% capacitance retention over 10,000 GCD cycles at 3 A g −1 . Download: Download high-res image (198KB) 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
Qianwei Zhang,Jiawei Kou,Jiahui Shi,Yu Liu,Yanrui Hao,Mingyue Wang,Hao Guo,Wu Yang
Pre-anchoring and alkali-regulated strategy constructs NiCo-LDH@NiFe 2 O 4 QDs heterostructure. • NiFe 2 O 4 quantum dots boost conductivity and structural stability of LDH. • Alkali source tuning modulates nanosheet morphology and ion diffusion. • The NiCo-LDH@QDs-K electrode delivers 2195.55 F·g -1 at 1 A·g -1 . • Asymmetric supercapacitor achieves 80.98 Wh·kg -1 , powers timer for 28 min. Layered double hydroxides (LDHs) derived from metal-organic frameworks (MOFs) possess high theoretical capacitance. However, their inherent low conductivity and structural instability during cycling limit practical applications. In this study, we propose an innovative pre-anchoring and directed conversion synthesis strategy for the rational synthesis of a tightly integrated NiCo-LDH with quantum dots (QDs) composite. Highly conductive NiFe 2 O 4 QDs were uniformly pre-anchored onto the surface of NiCo-BTC, followed by precise regulation of the alkalization process to in situ convert the precursor into LDH. Owing to the spatial confinement effect of the MOF precursor, aggregation of the quantum dots is effectively suppressed. Meanwhile, the in situ conversion process establishes strong interfacial coupling and efficient ion/electron transport pathways between the two components, thereby synergistically improving electrical conductivity, charge-transfer kinetics, and structural robustness.Benefiting from this unique structural design, the resulting composite exhibited outstanding electrochemical performance, achieving a specific capacitance of 987.99 C·g -1 at a current density of 1 A·g -1 . Furthermore, an asymmetric supercapacitor assembled with this composite as the positive electrode achieved an energy density of 80.98 Wh·kg -1 at a power density of 784.94 W·kg -1 and is capable of powering commercial electronic devices. This study provides an effective strategy for developing high-performance MOF-derived electrode materials through interfacial structural design. Download: Download high-res image (226KB) Download: Download full-size image Through pre-anchoring and targeted conversion strategies, NiFe 2 O 4 quantum dots were uniformly anchored onto the NiCo-BTC surface and in situ converted into LDH, successfully constructing the NiCo-LDH@NiFe 2 O 4 QDs composite material. The asymmetric supercapacitors assembled from this material exhibited high energy density.
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ACS Omega
·
2026
·
IF 4.3
Shaozhi Wang,Yuli Liu,Chunhui Duan,Weihua Meng,Jixing Xie,Jianzhong Xu
Unsaturated polyester resin (UPR) is a long-chain, hydrocarbon-rich thermoset that is intrinsically highly flammable, which severely limits its engineering applications. Herein, NiCo-layered double hydroxide (NiCo-LDH) nanosheets were covalently grafted onto halloysite nanotubes (HNTs) via an in situ substitution route that employed ZIF-67 as a sacrificial bridging agent, yielding a hierarchical HNTs@NiCo-LDH hybrid. Upon incorporation into UPR, the hybrid formed a dense metal oxide shield during combustion that suppressed the release of combustible volatiles and attenuated radiative heat feedback, thereby imparting superior flame retardancy. Cone calorimetry revealed that 6 wt % HNTs@NiCo-LDH (UPR-H@L) reduced the peak heat release rate by 37.0% and the peak smoke production rate by 23.9% relative to neat UPR. Transition-metal-catalyzed charring generated a compact, continuous carbonaceous barrier that further inhibited mass and energy transfer. Simultaneously, the tensile and impact strengths of UPR-H@L increased, demonstrating a synergistic reinforcement effect. This work establishes a facile physical-barrier/chemical-catalytic strategy for simultaneously enhancing the fire safety and mechanical performance of UPR composites.
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PubMed
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Yongxin Lu,Junli Guo,Zhenkun He,Zhida Gao,Yan-Yan Song
With the wide application of supercapacitors, it has been recognized that the drop of energy storage capacity due to cold environmental temperatures limits their utilization efficiency. In this study, a binder-free Ni/Co-layered double hydroxide (LDH)-based high-performance energy storage device is constructed on Ni foam by in situ electrochemically triggered MOF hydrolysis, which exhibits a remarkably enhanced capacity under solar irradiation. Through electrochemically controlled hydrolysis, the ligands in MOFs are replaced by OH – , and the obtained NiCo-LDH retains the original hierarchical porous structure of the MOFs. Benefitting from the sufficient oxygen vacancies and large surface area, the NiCo-LDH electrode shows a high capacity of 5.4 C cm –2 at 1.25 mA cm –2 , which is 64.3 times higher than that of the MOF template. Importantly, the excellent photothermal conversion ability (temperature increase of 52.9 °C within only 30 s) under solar irradiation increases the capacity to 226.0% even at sub-freezing temperature. Furthermore, the asymmetric supercapacitor fabricated using NiCo-LDH delivers an energy density increase of 329.2% in a low-temperature environment (−4 °C) after 15 min solar-light irradiation.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Zhaobo Fan,Xiaojie Zhang,Youji Li,Xin Guo,Zhiliang Jin
Hydrogen evolution of inorganic photocatalysts is currently a hot research topic. In order to prepare highly efficient catalysts for hydrogen evolution, p-n type heterojunctions were successfully constructed by closely combining p-type Cu 2 O and n-type NiCo-LDH with opposite electrical properties by a simple electrostatic self-assembly. In addition, because the positions of the two single catalysts NiCo-LDH and Cu 2 O Fermi levels are dissimilar from those of traditional p-n heterojunctions, the extremely high movement of Fermi levels forms a strong built-in electric field, which powerfully prevents the gradient diffusion of charge and facilitates the migration of intrinsic photocarriers. Furthermore, the flower cluster NiCo-LDH is composed of two-dimensional thin sheet structure, which has a large specific surface area and can prevent Cu 2 O agglomeration. Under the condition of using triethanolamine solution and eosin Y (EY) respectively as sacrifice reagent reducing agent and photosensitizer, the composite catalyst has reached 18332 μmol·g −1 in 5 h, which was increased by 8.5 times compared to the pure Cu 2 O. This research provides an innovative strategy to construct a heterojunction between a metal double-layer hydroxide and a non-noble metal oxide to realize an effective photocatalytic hydrogen production .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yuan Chen,Hao Guo,Fan Yang,Ning Wu,Junye Zhang,Liping Peng,Bingqing Liu,Zhilan Pan,Wu Yang
A metal porous carbon (Ni@NC) supported nickel/cobalt layered double hydroxide (NiCo-LDH) (Ni@NC@NiCo-LDH) with a cauliflower morphology was synthesized by a successive double template method . At first a nickel metal-organic framework (Ni-MOF) was prepared and used as a sacrifice template to produce metal porous carbon (Ni@NC). Then the prepared conductive porous carbon material was exploited as a substrate for in-situ growing of ZIF-67 on its surface. Lastly the obtained Ni@NC@ZIF-67 was further used as a sacrifice template to prepare the final electrode material Ni@NC@NiCo-LDH by Ni 2+ etching and co-precipitation. The cooperation of Ni@NC with excellent conductivity and NiCo-LDH with superior pseudocapacitive property yielded a synergistic effect , which effectively improved the electrochemical performance of the resulted electrode material. And the special flower morphology exposed more redox active sites and provided proper charge transport path for enhanced electrochemical performance. The prepared Ni@NC@NiCo-LDH exhibited a high specific capacitance of 1761.8 F·g −1 at the current density of 1 A·g −1 . The assembled Ni@NC@NiCo-LDH//AC asymmetric supercapacitor also displayed an acceptable energy density (39.27 Wh·kg −1 at the power density of 757.21 W·kg −1 ) and ultrahigh cycling stability (94.74% capacitance retention after 25000 cycles at 10 A g −1 ).
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