Molecular Catalysis
·
2025
·
IF 4.9
Hanyu Xu,Jianjun Pu,Xu Zou,Qian Li,Jiawen Zhou,Hongchuan Ye,Ning Li,Rong Peng,Xingyan Liu,Youzhou He,Jinhang Dai,Siping Wei
The advancement of alkaline water electrolysis relies on creating efficient, durable, and affordable electrocatalysts for the oxygen evolution reaction (OER). Here, we reported a heterostructured CoFe/a-NiFe LDH catalyst that integrates amorphous NiFe layered double hydroxide (LDH) with crystalline CoFe LDH through interface engineering. The CoFe/a-NiFe LDH catalyst achieved superior activity with an overpotential of 265 mV at 100 mA·cm −2 , which outperformed the commercial RuO 2 . It also demonstrated rapid kinetics with a Tafel slope of 38.8 mV·dec −1 . The synergistic coupling between the crystalline domains and amorphous regions minimized charge transfer resistance while maximizing electrochemically accessible sites. Remarkably, the catalyst showed outstanding durability, operating consistently for 220 h at demanding current densities of 100 mA·cm −2 . This work established amorphous-crystalline interface engineering as a powerful strategy for designing high-performance water oxidation electrocatalysts.
研究领域:
材料科学
·
电化学
·
能量转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2015
·Vol. 10
·期 3
·630-636
·
IF 4.587
Lihua Yao,Ding Wei,Dongpeng Yan,Changwen Hu
Graphical Flower power : Hierarchical flower-like CdZnS@LDH microarchitectures were obtained by hydrothermal synthesis and exhibited enhanced visible-light-driven photocatalytic H 2 production compared with pristine CdZnS microspheres. The development of new semiconductor photocatalysts toward splitting water has supplied a promising way to obtain sustainable and clean hydrogen energy. Herein, CdZnS@layered double hydroxide (LDH) composites with a hierarchical flower-like microstructure have been fabricated with the aid of ZnCr–LDH nanosheets as templates. XRD, SEM and HRTEM show that the ZnCr–LDH nanosheets are uniformly dispersed within the composites. The surface of the hierarchical structures is rough and composed of numerous nanocrystals of CdZnS. The HRTEM images indicate that the surface of CdZnS nanocrystals is mainly composed of the (111) plane. Moreover, the visible-light-driven H 2 production performance of the CdZnS in the presence and absence of ZnCr–LDH nanosheets has been measured. The results show that ZnCr–LDH nanosheets play an important role in the hierarchical morphology and photocatalytic activity of the as-prepared samples. In the water-splitting process, the visible-light-driven H 2 -production rate of hierarchical flower-like CdZnS@LDH is 4.03 times and nearly 10 times higher than that of pristine CdZnS microsphere and pure commercial CdS, respectively. Therefore, this work not only achieves enhanced catalytic performance of the CdZnS by the introduction of ZnCr–LDH nanosheets, but also supplies an insight into the relationship between the hierarchical morphology and the semiconductor photocatalytic activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2024
·
IF 3.4
Yu Sun,Jinxing Mi,Liang Li,Shuxiu Yu,Shixiong Yuan,Guimin Wang,Jianjun Chen,Junhua Li
The unique ability of Cu + to enhance C-C coupling makes it important in the field of CO 2 reduction reaction (CO 2 RR) over Cu-based catalyst, while Cu + is very prone to deactivation. Hereby, we propose a simple and feasible stabilization strategy to stabilize Cu + species through reducing Cu-Mg-Al hydrotalcite by adding ascorbic acid, which owns stable product selectivity in a span of 6 h at −0.95 V vs.RHE. Characterization results show that the excellent stability is promoted by the heterostructure of Cu 2 O and hydrotalcite with retained Cu + species, which derives from Cu 2 O and slow down the rapid reduction of Cu + to Cu 0 .
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Guoxin Ding,Chenfeng Sun,Meiyi Wang,Yuexiang Hu,Guojun Cheng,Jun Liu
The 2D nanomaterial has been widely used in the field of electromagnetic wave absorption because of its high specific surface area and special electrical properties. In this work, three 2D materials were integrated to form a unique ternary composite with Ti 3 C 2 T x MXene as the substrate, RGO as the intercalator with additional components, and CoFe-LDH loaded on the MXene/RGO surface. The interfacial and dipole polarizations were notably enhanced due to the abundant formation of heterogeneous interfaces between the three 2D materials and their corresponding abundant functional groups and defects, and the space between the 2D lamellae enabled multiple reflections of electromagnetic waves. Compared with pure MXene, the MXene/RGO/CoFe-LDH composites exhibited excellent electromagnetic wave absorption performance due to the synergy of multiple loss mechanisms, resulting in the best reflection loss value of −58.9 dB at 13.12 GHz.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 5
·951
·
IF 4.2
Tingxia Wang,Xu Zhang,Xiaojiao Yu,Junpeng Li,Kai Wang,Jinfen Niu
A bifunctional electrocatalyst with high efficiency and low costs for overall water splitting is critical to achieving a green hydrogen economy and coping with the energy crisis. However, developing robust electrocatalysts still faces huge challenges, owing to unsatisfactory electron transfer and inherent activity. Herein, NiFe LDH/NiS2/VS2heterojunctions have been designed as freestanding bifunctional electrocatalysts to split water, exhibiting enhanced electron transfer and abundant catalytic sites. The optimum NiFe LDH/NiS2/VS2electrocatalyst exhibits a small overpotential of 380 mV at 10 mA cm−2for overall water splitting and superior electrocatalytic performance in both hydrogen and oxygen evolution reactions (HER/OER). Specifically, the electrocatalyst requires overpotentials of 76 and 286 mV at 10 mA cm−2for HER and OER, respectively, in alkaline electrolytes, which originate from the synergistic interaction among the facilitated electron transfer and increasingly exposed active sites due to the modulation of interfaces and construction of heterojunctions.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 25
·e202304989
·
IF 1.9
Ying Chen,Zhangyi Lv,Jinqiu Yuan,Mingchun Bi,Yuning Liang
Graphical ZIF-67 nanocubes (ZIF-67 NCs) had been etched to produce small amounts of cross-linked Co-LDH-1 while preserving the cubic structure, which provided sufficient quantities of cobalt ions. The catalytic activity of OER has been enhanced by the cubic-structured LDH, which leads to a significantly lower overpotential in alkaline media and a calculated lower activation energy Ea. To address the substantial energy needs of the quickly evolving modern civilization, efforts are still needed to provide sustainable renewable energy sources. The electrocatalytic Oxygen evolution reaction (OER) is one of the essential technologies used in the various hydrogen production techniques. ZIF-67 nanocubes (ZIF-67 NCs) were synthesized in an aqueous solution and used as sacrificial templates. Cobalt nitrate hexahydrate was added under water bath conditions, resulting in the evolution of numerous small layered layers of cobalt hydroxide. This ultimately led to the formation of multilayered, three-dimensionally crosslinked Co-LDH with a porous networked cubic morphology. Hydrolysis of Co 2+ at different concentrations produces different degrees of weak acidic environments, and the loose LDH on the cubic structure of the best catalyst, Co-LDH-1, exposes more active cobalt sites for the OER, which results in a high electrochemically active surface area, with an overpotential of 354 mV and a Tafel slope of 79.06 mV dec −1 at a current density of 10 mA cm −2 , and good stability and low activation under alkaline condition also has good stability and low activation energy. It provides us an easy and practical plan for logically creating ZIF-derived hydroxide materials, leading to the development of affordable and effective electrocatalysts.
研究领域:
材料科学
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电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yunxia Luo,Yongping Luo,Chao Liu,Wenzhen Qin,Yuhua Dai,Yu Xie,Xiu Wang,Jiansheng Zhang
Plumbing and devising photocatalysts for high photocatalytic hydrogen production is still a major challenge. In this study, the NiAl-LDH/Mn 0.5 Cd 0.5 S heterostructure composites are prepared by hydrothermal method. When the loading weight of NiAl-LDH is 20 wt%, NiAl-LDH/Mn 0.5 Cd 0. 5S composites has the excellent ability to separate photogenerated charge carriers under visible light. Meantime, the NiAl-LDH/Mn 0.5 Cd 0.5 S composites possess prominent photocatalytic hydrogen production rates of 55.9 mmol·h −1 ·g −1 , which is 7.5 times of pure Mn 0.5 Cd 0.5 S and 25 times of NiAl-LDH. According to the data, the photocatalytic mechanism of electron-holes movement over NiAl-LDH/Mn 0.5 Cd 0.5 S composites is unlocked. This work offers a reference for designing novel heterojunction for photocatalytic production of H 2 .
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 10
·13396-13408
·
IF 2.478
Zhao Guoqing,Zou Jiao,Liu Lukai,Hu Jun,Yu Jingang,Jiao Feipeng
Direct fixation of nitrogen (N 2 ) to ammonia (NH 3 ) under ambient conditions via photocatalysts is a promising method to relieve the pressure of energy shortage, where chemisorptions of torpid nitrogen and delivery of photoproduced electrons to N≡N bond are recognized technical limitations. In this work, we have developed the catalysts of NiFe-LDH-derived sulfides microspheres ([NiFe]S) with excellent photocatalytic activity for reduction of N 2 to NH 3 . Excitingly, the NH 3 generation rates of [NiFe]S catalysts reached up to 111.83 μmol · L −1 · h −1 under visible light irradiation in water, which were 10.35 times than that of NiFe-LDH microspheres. The reason was due to the higher photo-induced carrier separation and transmission efficiency of [NiFe]S microspheres. In addition, the possible photocatalytic mechanism was proposed. This new work could guide the design of efficient catalysts and open up the application of metal sulfides in photocatalytic N 2 fixation.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Wang,Guicai Lv,Cheng Wang
Hydrogen production by electrochemical overall water splitting is considered as a clean and renewable approach for greener energy. However, the efficiency of water electrolysis suffers from the sluggish kinetics and high overpotential of OER. Although NiFe LDH is regarded as a promising OER catalyst, it faces the problem of poor conductivity, resulting in the limitations of HER performance. Herein, a hybrid nano-architecture of CoNiN@NiFe LDH as a bifunctional electrocatalyst for overall water splitting is fabricated via in-situ electrochemically assembling hierarchical NiFe LDH nanosheets on the surface of CoNiN. CoNiN@NiFe LDH shows excellent activities for OER with the overpotentials of 227 and 291 mV to deliver the current densities of 10 and 100 mA cm −2 , respectively. Moreover, an alkaline electrolyzer with CoNiN@NiFe LDH as anode and cathode requires a cell voltage of 1.63 V to achieve 10 mA cm −2 . In addition, the excellent stability with 100 h towards overall water splitting outperforms most transition metal-based bifunctional electrocatalysts. The superior performance is attributed to the abundant active sites, the strong electronic interaction, and the corresponding metal (oxy)hydroxides species generated by in situ surface reconstruction and phase transformation.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 8
·1-8
·
IF 2.7
Cui Hongshan,Hu Lifang,Zhu Jichao,Wang Liping,He Jie
Ethyl mercaptan is a typical volatile pollutant with strong irritating odor and very low olfactory threshold. A small amount of exhaust emissions will cause a very bad impact on the surrounding environment and human health. A novel Fe 2 O 3 -loaded ZnTi-layered double hydroxide (Fe 2 O 3 –ZnTi-LDH) photocatalytic material was prepared by hydrothermal method. The physical and chemical properties of Fe 2 O 3 –ZnTi-LDH and its corresponding precursors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (ATR, FT-IR), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption–desorption measurements, Ultraviolet–visible diffuse reflection spectrum (UV–vis DRS), and Mott–Schottky (MS) method. The photocatalytic performance of the material is evaluated under a static condition. The results show that the uniform distribution of Fe 2 O 3 on ZnTi-LDH improves the photocatalytic efficiency of the Fe 2 O 3 –ZnTi-LDH. At the same time, the interaction between the Fe 2 O 3 and the ZnTi-LDHs further enhances the catalytic stability of the Fe 2 O 3 –ZnTi-LDH. The results also show a significant synergistic effect between Fe 2 O 3 and ZnTi-LDH. Fe 2 O 3 –ZnTi-LDH provides a new catalyst structure for photocatalytic conversion of ethyl mercaptan and a new research idea for the treatment of ethyl mercaptan.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 11
·117501
·
IF 3.721
Ziyin Yang,Xiao Bai,Chengcheng Qi
NiCo layered double hydroxide (NiCo-LDH) was explored as electrocatalyst for nonenzymatic detection of H2O2, in which NiCo-LDH with different morphologies were synthesized through a hydrothermal method, and then acid-etched NiCo-LDH (E-NiCo-LDH) was obtained via an acid-base reaction. The morphology, composition and structure were characterized by transmission electron microscopy and X-ray diffraction. Electrochemical measurements reveal that E-NiCo-LDH exhibits an excellent electrocatalytic activity toward H2O2 oxidation and the sensor based on E-NiCo-LDH is able to detect H2O2 in a linear range of 2.0 μM to 1.1 mM with a high sensitivity of 728.6 μA mM−1 cm−2 and a low detection limit of 0.2 μM (S/N = 3). This indicated that E-NiCo-LDH is a promising material for electrochemical sensing of H2O2.
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jia Li,Wentao Liu,Yang Li,Zhi Liu,Yang Liu
A series of hierarchical flower-like CdS/carbon quantum dots/NiAl-LDH (CCL) photocatalyst have been successfully prepared to achieve efficient conversion of CO 2 -to-CO via a simple yet effective hydrothermal method. In the CCL, interspersed-CQDs not only increase the number of reactive sites but also reduce inner electronic impedance with the assistance of light reflecting-scattering effect. This significantly improves electron migration efficiency and inhibits the recombination of photoinduced electron-holes pairs. Without any sacrificial agent or photosensitizer, the sample of CCL-1 exhibits the highest CO evolution rate of 7.04 μmol·g −1 ·h −1 in water under simulated sunlight illumination with a large specific surface area (129.15 m 2 g −1 ) and an appropriate CQDs content of 15.2 wt%, which is 12.8- and 11.2-fold higher than those of pristine LDH, pure CdS, and many previously reported LDH-based counterparts. A type-Ⅱ interfacial charge transfer mechanism is proposed, where electrons migrate rapidly from CdS to LDH with highly-interspersed CQDs as unhindered electron conduction bridges. The present work outlines a simple and controllable LDH-based heterojunction, which give rise to superior photocatalytic activity for CO 2 photoreduction.
研究领域:
材料科学
·
环境科学
✓ 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）