APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Guoqiang Liu,Cheng Huang,Zeheng Yang,Jianhui Su,Weixin Zhang
Water electrolysis has been widely considered as a promising technique for generating hydrogen. However, oxygen evolution reaction (OER) as a sluggish anodic reaction, usually suffers from high overpotential, which greatly impedes the efficiency of hydrogen generation. Herein, we report an ultrathin NiMn-LDH/CFC growth on commercial carbon fiber cloth (U-NiMn-LDH/CFC) substrate through a facile hydrothermal method. The U-NiMn-LDH/CFC can be successfully used to assemble an energy-saving water splitting system via integrating anodic urea oxidation reaction (UOR) and hydrogen evolution reaction (HER). The as-prepared U-NiMn-LDH/CFC nanosheets with ultrathin structure exhibit reliable electrocatalytic activities toward UOR (1.351 V vs. RHE@20 mA cm −2 ) and HER (169 mV@10 mA cm −2 ). A two-electrode water splitting cell is further constructed and delivers almost 210 mV lower oxidation potential at 10 mA cm −2 with containing (1.0 M KOH) 0.5 M urea in comparison to that in pure overall water splitting. Furthermore, the above two-electrode system shows excellent electrolysis stability.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 30
·10557-10566
·
IF 4
Biao Zhang,Ying Yang,Jingliang Cai,Xiaolong Hou,Caini Yi,Xuan Liao,Yuping Liu,Changguo Chen,Danmei Yu,Xiaoyuan Zhou
As a promising supercapacitor electrode material, NiMn-LDH has attracted great attention due to its high theoretical capacity and easy preparation. However, the development and application of NiMn-LDH in supercapacitors are limited because of its poor cycling stability and low electrical conductivity. To solve these problems, a NiMnMg-LDH with a three-dimensional porous morphology has been successfully fabricated by doping with Mg to improve its electrochemical properties. Experimental results indicate that NiMnMg-LDH-7 delivers a specific capacitance of 1772 F g−1 at a current density of 1 A g−1. Moreover, it can still reach 1080 F g−1 when the current density is increased 10 times, suggesting excellent rate capability. The asymmetric supercapacitor (ASC) NiMnMg-LDH-7//AC can provide a high energy density of 28 W h kg−1 at a power density of 700 W kg−1. Furthermore, the energy density can still reach 16 W h kg−1 even if the power density is increased to close to 3500 W kg−1. The capacity retention of this ASC device can reach 74% after 3000 cycles at a current density of 3 A g−1. These excellent properties of NiMnMg-LDH can be attributed to the obvious improvement of its specific surface area and electrical conductivity owing to doping with the element magnesium. We believe that this work could provide a new idea for the preparation of high-performance electrode materials for supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Qiangli Lv,Haoran Guo,Duo Xu,Yuling Zhai,Hua Wang,Tao Zhu,Xing Zhu,Kongzhai Li,Zhihong Yang,Zhishan Li
The urea oxidation reaction (UOR) is considered as an alternative to the oxygen evolution reaction for high-efficiency hydrogen production, because it can simultaneously achieve wastewater treatment and hydrogen production. However, the slow kinetics of the UOR hinder its widespread adoption due to relatively complex molecule, it is urgent to rational design and preparation of high-performance UOR catalysts. Herein, we report a simple synthesis of the NiMn-LDH@Rh(OH) 3 heterostructure and a systematic investigation of urea-assisted electrolytic hydrogen production， significantly enhances the efficiency of urea electrolysis. The amorphous Rh(OH) 3 structure provides a higher density of active sites and greater catalytic surface exposure, while the synergistic interaction between Rh(OH) 3 and NiMn-LDH improves both electrical conductivity and catalytic performance. The catalyst of NiMn-LDH@Rh(OH) 3 –3 requires only 1.29 V overpotential to achieve a current density of 10 mA cm −2 in a 1.0 M KOH and 0.33 M urea solution, surpassing other catalysts. Furthermore, it demonstrates remarkable stability with minimal potential increase during 48-hour chronopotentiometric tests at 100 mA cm −2 . This work making the developed strategy promising for the rational design of highly active electrocatalysts for green hydrogen production and the treatment of urea-rich wastewater.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanmeng Cai,Guangyuan Zhao,Qing Yuan,Jinsheng Zhao
Layered double hydroxides (LDHs) have been recognized as prospective two-dimensional capacitive deionization (CDI) faradaic materials for Cl - capture, offering tunable interlayer distance, high anion exchange capacity, and reversible ion intercalation/deintercalation ability. However, the self-stacking tendency, poor electrical conductivity, and undesired stability of LDHs nanosheets severely impede ion migration and active sites accessibility, leading to unsatisfactory CDI performance. Herein, we present an elaborately designed three-dimensional sandwich structural composite N-doped porous carbon spheres/NiMn-layered double hydroxide/MXene (NPC/NiMn-LDH/MXene) to efficiently capture Cl - as the CDI anode. In this assembly, MXene not only ensures excellent electrical conductivity for rapid ion transfer but also serves as a robust substrate for the uniform dispersion of NiMn-LDH nanosheets. Moreover, NiMn-LDH effectively inhibits the agglomeration of MXene and provides substantial storage capacity for ion accommodation. The conductive intermedium NPC establishes interconnected conductive channels, enriching accessible charge transport pathways, resulting in an accelerated ion diffusion kinetics. Accordingly, the NPC/NiMn-LDH/MXene electrode demonstrated predominant specific capacitance (265 F g - 1 ), lower ion transfer resistance, and an optimized Cl - diffusion coefficient (7.95 × 10 -17 cm 2 s −1 ). In an asymmetrical CDI cell assembly, the NPC/NiMn-LDH/MXene//NPC cell delivered outstanding Cl - removal capacity (43.5 mg g −1 ), swift salt removal rate (12.5 mg g −1 min −1 ), efficient energy utilization (0.183 kWh kg −1 -NaCl), and remarkable cyclic adsorption/desorption stability (89.6 % retention rate). Additionally, density functional theory (DFT) calculations validated that the sandwich construction of NPC/NiMn-LDH/MXene facilitated interfacial charge transfer from NPC and MXene to NiMn-LDH, accelerated ion transfer rate, and reduced ion migration energy, resulting in accessible ion diffusion kinetics and smooth Cl - shuttle. This unique approach enriches ion transfer pathways by leveraging the distinctive structural characteristics of faradaic materials, providing valuable insights for further developments in CDI technology.
研究领域:
材料科学
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环境工程
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Jing Qian,Juan Yang,Yuanyuan Zhang,Ting Zeng,Qijin Wan,Nianjun Yang
Development of sensitive, selective, and facile electrochemical analytical approaches to monitor tryptophan in different samples is of high significance. For such approaches, efficient electrodes play the key role. Herein, a NiMn-layered double hydroxide (LDH)@poly- l -lysine (PLL) composite has been prepared through in-situ electro-polymerization and further utilized to monitor tryptophan in medicament and biological systems. The as-synthesized NiMn-LDH@PLL composite is highly stable and features a flower-like morphology. It is found that the electron transfer rate of NiMn-LDH@PLL is greatly improved due to the introduction of PLL. The existing Lewis acid—base interaction between LDH and PLL contributes to the increase of unsaturated metal sites and endows this heterojunction composite with high electrocatalytic activity . Especially, the NiMn-LDH (2:1)@PLL composite displays much improved electrochemical response toward tryptophan sensing. This is due to reasonable balance between the outstanding electrocatalytic ability of nickel and the conductivity improvement caused by manganese species. On the other hand, the coordination promotion between NiMn-LDH and PLL is also conducive to improve the sensitivity of electrochemical response. The fabricated sensor exhibits wide linear response in the concentration ranges of 0.1–40 μM and 40–130 μM for tryptophan detection, along with a low detection limit of 52.7 nM. It further displays a high anti-interference ability for tryptophan monitoring even in the presence of other coexistent amino acids and small-sized biological molecules. This study provides a new way to employ LDHs as brilliant sensing platform to ensemble electrochemical sensors for the monitoring of biomolecules.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 17
·9546-9554
·
IF 11.9
Dongyan Gao,Renning Liu,Dandan Han,Pengcheng Xu,Ping Wang,Yen Wei
Engineering hierarchical heterostructure materials has been recognised as a challenging but prepossessing strategy for developing hybrid supercapacitors. Thus, a Ni–Co PBA derived 3D/1D heterostructure NiO/NiCo2O4 based layered double hydroxide on carbon cloth (CC/NiO/NiCo2O4/NiMn-LDH) as a battery-type electrode was successfully designed via a controllable hydrothermal method. The 3D Ni–Co PBA nanocubes served as scaffolds, providing more space for the nickel-cobalt precursors to grow and then calcine to form a continuous conductive layer of 3D/1D CC/NiO/NiCo2O4. Subsequently, 2D ultrathin NiMn-LDH nanosheets were uniformly anchored on 3D/1D NiO/NiCo2O4, resulting in a unique hierarchical structure that effectively addressed the restacking issue and dead volume of NiMn-LDH, contributing to increased charge and electron transport rates, which promoted the reaction kinetics. Benefiting from abundant interfaces with the open channels of the nanoarchitecture, the CC/NiO/NiCo2O4/NiMn-LDH electrode showed an exceptional specific capacity of 1593.0 C g−1 at 1 A g−1 and a desirable rate performance of 92.9% at a current density of 8 A g−1. Surprisingly, HSC devices can achieve an ideal specific energy of 44.28 W h kg−1 at a specific power of 108.22 W kg−1 with 97.59% cycling durability after 10 000 consecutive charge/discharge cycles. These remarkable properties indicate that the designed novel hierarchical heterostructure electrode has great potential for broad applications in electrochemical energy storage systems.
研究领域:
材料科学
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能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ying Xue,Xilong Liu,Leiyun Han,Zhengjie Xie,Liangyu Liu,Yixin Li,Yingjie Hua,Chongtai Wang,Xudong Zhao,Xiaoyang Liu
The present study successfully synthesized NiCo 2 S 4 nanotubes@NiMn-LDH nanosheets core-shell hybrid structure on Ni foam through a controllable three-step facile hydrothermal method , the NiMn-layered double hydroxides (LDHs) nanosheets with unlike thicknesses adhere to the outer layer of NiCo 2 S 4 nanotubes by adjusting the heating time of hydrothermal reaction. The optimized NiCo 2 S 4 @NiMn-LDH electrode was able to transmit a high specific capacity of 822.64 C g −1 (4.36 C cm −2 ) at a high current density of 50 mA cm −2 , and maintained 92.7% of its initial specific capacity after 5000 cycles at a current density of 50 mA cm −2 when 2 M KOH was used as the electrolyte. Furthermore, an asymmetric supercapacitor (ASC) device fabricated with NiCo 2 S 4 @NiMn-LDH as the positive electrode and activated carbon (AC) as the negative electrode, and it achieved a maximal energy density of 53.10 W h kg −1 at a power density of 370.82 W kg −1 also maintained 94.3% retention of the initial specific capacitance after 10,000 cycles at a high current density of 20 mA cm −2 . With the excellent electrochemical properties , the as-prepared core-shell structured NiCo 2 S 4 @NiMn-LDH hybrid arrays have extraordinary application potential in the energy storage field.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 32
·12168-12176
·
IF 4.052
Hanchun Xia,Geng Li,Haoran Cai,Xiaolong Li,Peiheng Sun,Peijia Wang,Jiajie Huang,Liang Wang,Desuo Zhang,Yefeng Yang,Jie Xiong
The development of flexible energy storage devices for portable and wearable electronics has aroused increasing interest. In this work, three-dimensional hierarchical NiCo2O4@NiMn-LDH nanowire/nanosheet arrays have been successfully fabricated on carbon cloth through a facile hydrothermal and calcination synthetic method. Benefiting from the sophisticated hybrid nanoarchitectures with desirable structure and components, the optimized NiCo2O4@NiMn-LDH hybrid electrode is found to deliver a remarkable specific capacity of 278 mA h g−1 at 2 mA cm−2 and a good rate capability of 89.1% retention at 20 mA cm−2. Detailed analysis of the reaction kinetics for the hybrid electrode clearly indicates the dominant diffusion-controlled contribution to the total capacity. In addition, a flexible solid-state hybrid supercapacitor is assembled by taking NiCo2O4@NiMn-LDH and activated carbon as the cathode and anode, respectively, which manifests a maximum energy density of 47 W h kg−1 at a power density of 357 W kg−1 as well as an excellent long-term cycling stability (95.6% retention after 5000 cycles over 8 mA cm−2). Our work demonstrates the great potential of this core/shell hybrid nanostructure as an advanced battery-type electrode for high-performance flexible energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ghazala Maqsood,Muhammad Sohail Asghar,Bushra Shakoor,Muneerah Alomar,Muhammad Atif Ali,Yi E,Tao Mei,Muhammad Sultan Irshad,Xianbao Wang
Interfacial solar steam generation (ISSG) is severely limited by excessive salt accumulation and inefficient water movement. To overcome this, a hydratable skeleton is engineered through in-situ polymerization of polypyrrole (PPy) onto a NiMn-layered double hydroxide (LDH) for balanced water transport and effective salt-resistance without deterring the evaporation flux. The oxidation of Mn 2+ → Mn 3+ in the LDH matrix and shielding of PPy polymeric network (NiMn-LDH/PPy) endows stable, rapid hydration pathways for confined ion channels for salt rejection. The evaporator exhibits broadband light absorption (∼89 %), and achieves a high evaporation flux of 1.90 kg m −2 h −1 using seawater (3.5 wt%) under 1 kW m −2 solar intensity, maintained even after 20 cycles with greater flux retention. The hydratable skeleton's unique structure enables localized heat management (36.6 °C) and in-situ salt-ion dissociation (1.5 g NaCl completely rejected in 2 h), preventing crystallization. The structural optimization for effective heat mass transfer validates its structural stability under different humidity and environmental temperatures. The evaporation performance has been examined under natural conditions during different weather conditions, i.e., winter (1.76 kg m −2 h −1 ), and summer (1.82 kg m −2 h −1 ), in the same geographical location. This work provides a robust, process-engineered solution for durable solar desalination.
研究领域:
材料科学
·
能源科学
·
环境工程
·
纳米技术
·
物理化学
·
可持续发展技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hongchao Ma,Yan Chen,Xinyue Wang,Guowen Wang,Yinghuan Fu,Xinghui Liu
Photoelectrocatalytic (PEC) degradation of refractory antibiotics has attracted great interest in recent years, thereinto, the selection and design of efficient catalysts is particularly pivotal. With the in-depth study of semiconductor materials, the composite electrodes which can inhibit the recombination between electrons and holes have made significant progress in the field of PEC. Herein, the Co 3 O 4 @NiMn-LDH photoanode with stratified core-shell heterostructure was prepared and its removal process of sulfamethoxazole (SMX) was evaluated. The study showed that the constructed heterostructures had the following advantages: (i) the nutrient transporting arteries of Co 3 O 4 nanoneedle acted as charge transport channels to promote the induced charge migration and separation; (ii) The petal-like NiMn-LDH nanosheets were significantly adjustable and had excellent charge storage capabilities, which could remarkably collect solar energy leading to more active species; (iii) the pollutants could be gathered on the “spider network” surface of Co 3 O 4 @NiMn-LDH by electrostatic adsorption proved by DFT calculations, which was conducive to electrolyte penetration and utilization of the active site. The optimized Co 3 O 4 @NiMn-LDH-3.00 catalyst showed excellent PEC degradation activity and stability for SMX (initial removal rate of 98.00 %, removal rate of 75.12 % after five cycles). Based on the energy band matching and morphology construction proposed in this study, this unique layered core-shell heterostructure could be expected to achieve excellent PEC performance through synergistic effects.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
电化学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shunfa Zhou,Songlei Lv,Jiawei Shi,Li Zhang,Jing Li,Weiwei Cai
Due to its low equilibrium potential, urea oxidation reaction (UOR) is an advantageous alternative to the conventional anodic water oxidation reaction (OER) for energy-saving hydrogen production. Developing energy- and time-saving methods to synthesize active and stable UOR catalysts is significant. Herein, we present a simple and time-efficient method for the direct growth of defect-rich few-layered NiMn-layered double hydroxide (NiMn-LDH) nanosheets on nickel foam at ambient temperature and pressure. The defect-rich, few-layered structure exposes numerous active sites, promoting the formation of high-oxidation state Ni species at low overpotentials. Additionally, the introduction of Mn facilitates Ni oxidation and stabilizes in-situ formed NiOOH species. The optimized f-NiMn-LDH catalyst exhibits compelling UOR activity, requiring only 1.310/1.330/1.387 V for 10/100/400 mA cm −2 UOR, respectively. When used directly in urea-assisted hydrogen production, it achieves a low cell voltage of 1.436 V for a high current density of 100 mA cm −2 , representing a substantial 249 mV reduction compared to water electrolysis. This work offers a simple strategy for preparing high-performance electrocatalysts for energy-efficient hydrogen production via urea-assisted water splitting.
研究领域:
材料科学
·
电化学
·
能源转化与储存
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Yiteng Zhang,Liping Yang,Hui Zhu,Xueyan Xue,Ruiqiang Huo,Nan Xue,Chulei Zhao,Rui Sheng,Jiao Yin
Amorphous electrode materials offer distinct advantages for supercapacitor applications, yet the influence of crystallinity on their electrochemical performance remains underexplored. Here, we introduce a simple potentiostatic oxidation approach to fine-tune the crystallinity of NiMn layered double hydroxide (LDH) and systematically assess its charge-storage behavior under identical conditions. The NiMn-LDH grown on carbon cloth was subjected to potentiostatic oxidation via a standard three-electrode assembly bathed in 2 M KOH solution. The potentiostatic oxidation increased the Mn 4+ content, which altered the crystal structure of NiMn-LDH and reduced its crystallinity. With oxidation times from 0 to 1200 s, crystallinity decreased steadily, reaching an optimal state at 900 s (denoted O-900s). The O-900s electrode provides a notable specific capacity of 206.3 mAh g −1 at 1 A g −1 and retains 79.9% of that value after 4000 cycles. Additionally, the assembled asymmetric supercapacitor device exhibits an energy density of 30.1 Wh kg −1 at a power density of 775 W kg −1 . Our work delivers a robust framework for tuning crystallinity to optimize NiMn-LDH electrodes and advance high-performance supercapacitor design.
研究领域:
材料科学
·
电化学
·
能量存储
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纳米材料
·
超级电容器
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）