Surfaces and Interfaces
·
2025
·
IF 6.3
Yiwen Chen,Jun Guo,Buming Chen
NiFe LDH exhibits excellent OER performance due to its unique layered structure. However, the limited density of active sites in NiFe LDH hinders further enhancement of OER performance. By introducing surface oxygen defects to modulate the surface functional groups and interfacial active sites of LDHs, the electrocatalytic reaction kinetics are effectively optimized. The introduced oxygen vacancies increase the interface active sites of the NiFe LDH catalysts, thereby improving the interfacial reaction rate and optimizing the catalytic performance. In this work, sulfate-intercalated NiFe 0.3 LDH with abundant oxygen vacancies was synthesized by a co-precipitation method. The abundant oxygen vacancy defects resulted in a reduction in long-range atomic order and crystallinity, leading to the formation of a crystal/amorphous structure. This structural modification optimized the mass transport process during OER, enhanced the electronic configurations of Ni and Fe, and improved their synergistic interactions, thereby increasing the catalytic activity. At a current density of 10 mA cm -2 , a low overpotential of 230 mV and a Tafel slope of 50.7 mV dec ‑1 were achieved. Furthermore, after 40 h of continuous cycling, the overpotential of the NiFe0.3 LDH sample exhibited minimal change. This work provides new insights into the rational synthesis of high-performance OER catalysts with vacancy defects using the co-precipitation method.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhimin Li,Guanhui Chen,Shuqi Gou,Xiaofang Deng,Zhongai Hu,Xiaoquan Lu
The quasi-solid-state flexible supercapacitor has been successfully built by freezing-thawing method and in-situ polymerization. The high redox activity nickel-iron layered double hydroxide (NiFe-LDH) provides certain pseudocapacitance, interacts with high conductivity reduced graphene oxide (RGO), and avoids the activity structural collapse and agglomeration. Polyvinyl alcohol (PVA) serves as a flexible framework with uniform cross-linking between the components, facilitated by the presence of abundant hydrogen bonds. Polypyrrole (PPy) is further polymerized in-situ into PVA/RGO/NiFe-LDH to improve its electrochemical performance and flexibility. The PVA/RGO/NiFe-LDH 0.40 /PPy hydrogel electrodes exhibit a high area specific capacitance of 729 mF/cm 2 at 1 mA/cm 2 . The elongation at break of the electrodes is up to 749 %, which reflects excellent tensile properties. The quasi-solid-state flexible supercapacitor has been built using PVA/H 2 SO 4 as the gel electrolyte and PVA/RGO/NiFe-LDH 0.40 /PPy as the electrodes. The device exhibits a high energy density of 15.9 µWh/cm 2 at a power density of 0.19 mW/cm 2 and the capacitance retention of 96.7 % after 10,000 charge-discharge cycles.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Gaimei Gao,Mingyu Dou,Xiaojie Liu,Erkang Liu,Zixian Wang,Guang Yang,Hua Yang,Wenning Yang,Dacheng Li,Jianmin Dou
The development of photocatalysts with non-noble metals and the effective separation of photoexcited carriers is a significant strategy for accelerating surface reaction kinetics and promoting water splitting to produce H 2 . Herein, an exquisite core-shell NiFe-LDH@ZnIn 2 S 4 heterojunction photocatalyst was constructed by in situ decoration of ultrathin ZnIn 2 S 4 nanosheets on the surface of the flower-like NiFe-LDH microsphere . The synthesized 3D hierarchical NiFe@ZIS-25 composite exhibits enhanced photocatalytic H 2 evolution activity, reaching 9.12 mmol·h -1 ·g -1 , which is 2.52-fold higher than pure ZnIn 2 S 4 . The significant improvement in H 2 evolution performance could be attributed to the hierarchical core-shell structure of the NiFe@ZIS-25 photocatalyst, which enhanced the light capture ability. In addition, the interfacial coupling effect of ZnIn 2 S 4 and NiFe-LDH is beneficial to the migration of carriers. More importantly, the construction of Z-scheme heterojunction efficiently promotes the fast translation of photogenerated carriers while preserving a stronger reduction potential to achieve H 2 evolution. This work elucidates a rational strategy to develop efficient photocatalysts with hierarchical core-shell structures for water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ruikai Wang,Zhichao Hao,Haiyan Li,Chenghui Xia,Bohua Dong,Lixin Cao
Optimizing the interfacial action of photoanode for photoelectrochemical (PEC) behavior to facilitate charge transport is essential for enhancing solar-to-fuel efficiency. Herein, a typical CuWO 4 /NiFe-LDH/Ag photoanode was reported and an alternative pathway for charge transfer in the PEC process through surface states mechanism was elucidated. In particular, the layer double hydroxides (NiFe-LDH) acted as charge-transfer agents to facilitate the transfer of photogenerated carriers; while the surface plasmon resonance (SPR) effect of the Ag provided hot electrons, which increased the carrier concentration and promoted the charge separation. The influence of presence of surface states on the PEC process was systematically illustrated. Experimental results indicated that the optimized CuWO 4 /NiFe-LDH/Ag photoanode displayed a photocurrent that was more than an order of magnitude larger than that of the pure CuWO 4 (increasing from 0.30 mA cm −2 to 1.45 mA cm −2 at 1.23 V vs. RHE), accompanied by favorable electrochemical impedance and stability (maintaining 92.4%). Importantly, increasing the available filled surface states could be beneficial in enhancing the PEC behavior. This work provided additional insights into photoanode charge transport in PEC processes.
研究领域:
材料科学
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能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 41
·28583-28589
·
IF 3.9
Jie Zhang,Donggang Guo
The development of highly active and robust OER catalysts is the key to address the constraints on the efficiency of electrocatalytic water splitting technology. Herein, CoNi-pristine was synthesized by a simple hydrothermal method, further phosphorylation treatment and construction of heterojunctions to synthesize efficient oxygen evolution catalysts. The OER catalytic performance of the material was greatly enhanced by the advantages of proper self-supporting 3D morphology, formation of heterogeneous interfaces and the synergistic effect of CoNiP and NiFe LDH. In 1 M KOH, CoNiP@NiFe LDH/NF only requires an overpotential of 207 mV to reach a current density of 10 mA cm−2 and operates at high current densities for more than 120 h without significant decay. It provides assistance for the rational design of interface-engineered heterostructures based on the synthesis of OER catalysts with high catalytic activity.
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
Energy Material Advances
·
2023
·
IF 12.9
Yingying Hao,Chen Qiao,Shuping Zhang,Yibin Zhu,Lei Ji,Chuanbao Cao,Jiatao Zhang
Active site exposure and intrinsic catalytic performance are considered important aspects of oxygen evolution reaction catalyst design. In this work, the coordination capacity of tributylphosphine is utilized to construct cationic vacancy defects on NiFe-LDH nanosheets. As-prepared defective NiFe-LDH nanosheets show not only the optimization of the exposure ability of the active site but also the intrinsic catalytic capacity is improved by construction of cationic vacancy defect to tune local electronic structure. The x-ray photoelectron spectroscopy results revealed that after reconstruction of the prepared d-NiFe-LDH, high-valence Ni and Fe can stably appear on the surface of the material. The presence of high-valence Ni and Fe is considered to be the main reason to improve the intrinsic catalytic capacity of catalysts. Finally, d-NiFe-LDH nanosheets show excellent catalytic performance (η10 = 243 mV) and remarkable long-term stability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 35
·16625-16640
·
IF 3.553
Zhang Zewu,Zhou Jiamin,Wei Hanlin,Dai Yifan,Li Shijia,Shi Haojun,Xu Gang
Abstract Efficient design and preparation of cost-effective and binder-free bifunctional electrocatalysts to accelerate the hydrogen and oxygen evolution reaction (HER and OER) are critical for overall water splitting. In this work, 3D hierarchical NiFe-LDH/FeCoS 2 /CFC electrodes were synthesized for the first time. The carboxyl groups derived from acid treating promote the homogeneously coated FeCoS 2 on CFC, giving rise to the strongly coupled FeCoS 2 /CFC hybrid. The NiFe-LDH exhibited the vertical growth feature on the FeCoS 2 /CFC composite, which can efficiently expose the active edges sites. Due to unique structure and synergistic effect between the components, the NiFe-LDH/FeCoS 2 /CFC exhibits significant electrocatalytic activity and stability under alkaline environments, with overpotentials of 190 and 308 mV to achieve 10 mA cm −2 for OER and HER, respectively, providing it as a promising electrocatalyst for water splitting reaction. In addition, we deeply studied the synergistic catalytic mechanism of NiFe-LDH/FeCoS 2 /CFC, explaining the reasons leading to the improved catalytic performance of HER and OER. Graphic abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xinzhu Wen
It is crucial for the storage and conversion of hydrogen energy to substitute the low theoretical potential of urea oxidation reaction (UOR) for the high theoretical potential of anodic water electrolysis (oxygen evolution reaction (OER)). In this paper, it puts forward a brief and scalable strategy, so as to synthesize a novel bifunctional nickel-iron layered double hydroxide and multi-walled carbon nanotube composites supported on Ni foam, represented as NiFe-LDH/MWCNTs/NF. Electrochemical measurements demonstrate that NiFe-LDH/MWCNTs/NF is able to realize an efficient electrocatalysis for UOR. During this process, merely a potential of 1.335 V is needed at 10 mA cm −2 , which can be taken to replace OER, thus reducing overpotential in H 2 -production as well as power consumption . In addition, NiFe-LDH/MWCNTs/NF also exhibits electro-defense electrocatalytic efficiency to achieve the reaction of hydrogen evolving process, which provides a low overpotential of 98 mV at 10 mA cm −2 . To further prove it, all-water-urea electrolysis measurement is carried out in 1 M KOH and 0.5 M Urea with NiFe-LDH/MWCNTs/NF as cathode and anode respectively. NiFe-LDH/MWCNTs/NF||NiFe-LDH/MWCNTs/NF electrode manages to provide 10 mA cm −2 at a voltage of merely 1.507 V, 156 mV lower than that of water splitting, which proves its commercial viability in energy-saving hydrogen production .
研究领域:
能源材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Fengzhan Si,Yan Zhang,Yue Liang,Xiaomin Kang,Jianwen Liu,Xian-Zhu Fu,Jing-Li Luo
Water decomposition is the most promising system for developing renewable energy, but the sluggish kinetics of the oxygen evolution reaction (OER) is the key limiting factor. Recently, inorganic nanomaterials have been widely used as an effective catalyst for the stimulation of OER kinetics, for which the subsequent dispersion and the current collector are essential. We present a three-dimensional NiFe-layered double hydroxide (NiFe-LDH) synthesized by electrochemical corrosion , with increased electrochemical performance for electrocatalytic water splitting. Electrochemical measurements reveal that the NiFe-LDH has a lower Tafel slope of 46 mVˑdec −1 compared with the NiFe foam. The resulting electrode had a current density of 50 mAˑcm −2 and a remarkably low overpotential of 150 mV. Theoretical calculations and experimental observations showed and explained NiFe-LDH-90 electrode has high alkaline medium endurance, implying excellent OER electrocatalytic activity . The produced composite is expected to bring new insights into the design of foam electrocatalyst materials for OER.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Junjun Lv,Linmeng Wang,Rushuo Li,Kaiyue Zhang,Danfeng Zhao,Yaqiong Li,Xiangjun Li,Xiubing Huang,Ge Wang
The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property of the oxygen evolution reaction (OER). Herein, we synthesize a kind of nickel foam (NF)-supported electrocatalyst composed of a one-dimensional Co3O4 nanowire as the core and a two-dimensional NiFe-LDH nanosheet as the shell (denoted as NiFe-60/Co3O4@NF). Fluorine is introduced into the precursor Co(OH)F of Co3O4, which results in improved thermal stability and significantly increased regularly distributed oxygen vacancies, while the electrochemically deposited NiFe-LDH nanosheets possess a crystalline/amorphous hybrid structure. As a result, the hetero-interface mainly constituting Ni species from NiFe-LDH and Co3O4 from Co(OH)F contributes to the interaction between Co and Fe species and facilitates the electron transfer. Simultaneously, the interaction between oxygen vacancies in Co3O4 and coordinatively unsaturated Fe species in the amorphous area in NiFe-LDH is also determined, finally completing the electron backtracking. Benefiting from these factors, only low overpotentials of 221 and 257 mV are required to deliver the current densities of 100 and 500 mA cm–2, respectively, with a quite small Tafel slope of 34.6 mV dec–1 during OER for the well-designed NiFe-60/Co3O4@NF electrocatalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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
CRYSTENGCOMM
·
2023
·
IF 3.1
Yujie Jia,Shuhan Jiang,Qianchen Ou,Yanan Liu,Jian Zhang,Yangjie Zhou,Yuan Lian,Hongmei Wang
NiFe-LDH/g-C3N4 (LDH/CN) heterostructures with different amounts of NiFe-LDH (LDH) were prepared by a hydrothermal method and characterized using different experimental techniques. Their photocatalytic properties were investigated using the degradation of tetracycline hydrochloride (TC) and the production of hydrogen from water splitting. Experimental results showed that the hydrogen production rate (780.5 μmol g−1 h−1) was 2.29 times that of pristine CN, and the TC removal rate (76.3%) of 1.8LDH/CN was 3.71 times that of CN. According to the detailed study of the structural, optical, and photoelectrochemical properties, a type II charge transfer mechanism was proposed to explain the improved photocatalytic performance of LDH/CN.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）