CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Wancheng Zhao,Jiapeng Ma,Dong Tian,Baotao Kang,Fangquan Xia,Jing Cheng,Yajun Wu,Mengyao Wang,Gang Wu
ABSTRACT In order to reduce energy consumption in water electrolysis, it is of great importance to design active and stable electrocatalysts for hydrogen evolution reaction (HER) in alkaline solution, especially based on earth-abundant metal. Here we integrate carbon nanotubes (CNTs) and Ni-Ni(OH) 2 heterostructure multifunctional components to design a self-supported 3D CNTs-Ni-Ni(OH) 2 catalyst for HER by composite deposition and subsequent in-situ oxidation . In alkaline solution, this designed CNTs-Ni-Ni(OH) 2 catalyst exhibits 0 mV onset overpotential, and overpotentials of 65 mV and 109 mV at 10 and 50 mA/cm 2 respectively. Electrochemical measurements, characterizations, and simulation results attribute the outstanding performance to the incorporation of CNTs and heterostructure . CNTs induce the formation 3D catalytic surface, enhance electrochemical active surface area , and more importantly weaken the adsorption of H. Moreover, the formation of heterostructure, especially reversible Ni(OH) 2 , supplies active sites and adjusts the adsorption strength of H atom to an optimal value. CNTs and heterostructure synergistically facilitate water adsorption, promote water dissociation, and accelerate H 2 desorption. Significantly, integration of multifunctional components supplies a distinct strategy for development of cost-effective electrocatalyst with outstanding performance.
研究领域:
材料科学
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电化学
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催化
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纳米技术
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Suyu Kong,Meili Ding,Mengjiao Yu,Wei Rong,Yang Wang,Jianfeng Yao
Developing high-efficiency adsorbents with sufficient active species to remove phosphate from wastewater is still a significant and formidable challenge. Herein, a metal-ion modification strategy was developed to construct a series of lanthanum (La 3 + )-functionalized zirconium-based metal-organic frameworks containing different functional groups through a one-step solvothermal process. The investigations for the influence of functional groups of ligands on the resulting La species and the role of La(OH) 3 in the phosphate removal are the primary focuses of this research. Unlike the simple La doping in UiO-66, UiO-66-NH 2 and many previously reported MOF systems, La(OH) 3 was in situ formed during the preparation of La-functionalized UiO-66-OH, which was confirmed by powder X-ray diffraction. At room temperature, the optimized 0.5La-UiO-66-OH, with a molar ratio of La 3+ versus the total metal precursor of 0.5, exhibits a desirable adsorption capacity of 219.6 mg g −1 , exceeding those of UiO-66 (146.8 mg g −1 ), UiO-66-OH (158.9 mg g −1 ), and many reported adsorbents. Besides, reusability tests demonstrate that 0.5La-UiO-66-OH can maintain high adsorption performance (96 %) after five cycles and the practical usability of by 0.5La-UiO-66-OH is confirmed using real lake water. In-depth investigations (X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy) on mechanism unveiled that the adsorption of phosphate by 0.5La-UiO-66-OH involved a combined process of electrostatic attraction and ligand exchange. This research presents the first regulation of generating active La species within MOFs through subtle modification and provides valuable insights for wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Xingnian Duan,Jianmei Cen,Xiaoyu Qiu,Xixiang Liu
The development of high-performance and cost-effective electrocatalysts for oxygen evolution reactions (OER) is key to renewable energy conversion and storage technologies. In this paper, a hierarchical Co(OH) 2 -MoO 3 nanosheets with petal-like architecture was prepared by a simple one-step hydrothermal method using ZIF-67/NF as a precursor, and it was used as a direct electrocatalyst for OER. Notably, this petal-like Co(OH) 2 -MoO 3 /NF layered nanosheets not only prevent the agglomeration of nanostructured material , but also facilitate the complete penetration and diffusion of electrolyte. In addition, due to the strong electronic interaction between Co(OH) 2 and MoO 3 in the Co(OH) 2 -MoO 3 /NF system, Co(OH) 2 -MoO 3 /NF exhibits excellent electrocatalytic OER performance. It has a low overpotential of 273 mV at 10 mA cm −2 and excellent stability. This study provides a simple and effective strategy for the rational design and structural evolution of MOF-derived materials to achieve inexpensive and effective electrocatalysis.
研究领域:
材料科学
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能源化学
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电催化
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产品关联
DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 88
·85367-85373
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IF 3.289
Wenle Ma,Li Wang,Junying Xue,Hongtao Cui
Usually, monolayer-stated nanosheets of hydroxides have to be prepared by a multiple step layer-exfoliation processe, following “bottom-up” mechanism. The related preparative procedure is quite exhaustive and low yielding. In this work, α-Ni(OH)2 monolayer nanosheets were successfully synthesized in pure ethanol solution with a high yield using NaOH as a precipitant, based on a facile one-step “bottom-up” strategy. It was proposed that the water-deficient environment in ethanol solution could not provide adequate water molecules for the formation of hydrogen bond to link the layers, resulting in monolayer formation. Due to the large interface between the monolayer and electrolyte, the obtained monolayer nanosheets presented high electrochemical performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
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2025
·
IF 3.2
Lei Yuan,Yuanzhen Liu,Zhenyu Zhu,Na Xin,Liwei Zhang,Chunming Xu
We introduce Co(OH)₂/Ni₂Co (PO₄)₂ composite nanomaterials, synthesized via hydrothermal synthesis, as potential high-stability cathode materials for hybrid supercapacitors (HSCs). Structural characterization tests, such as XRD, SEM, HRTEM, and XPS, revealed the subtleties of the morphology, structure, and composition of these nanostructures. The electrode material exhibits an ultra-high capacitance of 2131.2 F g −1 at 1 A g −1 . When combined with activated carbon (AC), the resulting HSC exhibits a high capacitance of 123.2 F g −1 and remarkable cycle life, with 94.6 % capacitance retention after 12,000 cycles. The device achieves an energy density of 39.5 Wh kg −1 at 750 W kg −1 . This study meticulously details the synthesis, structural characterization, and extensive electrochemical analysis, culminating in their effective application in HSCs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yang Liu,Hailong Feng,Weiyi Li,Xueping Wang,Guoxiang Huang,Longxia Wang,Xingqiu Li,Yuxing Xie,Chenglu Liang
Catalysts in-situ reconstructed from transition metal sulfides for oxygen evolution reaction (OER) have been regarded as potential alternatives for the noble metal catalysts . Intriguingly, it was found that the self-optimized SO 4 2− @Cu doped Co(OH) 2 catalyst was reconstructed from bimetallic sulfide of CuCo 2 S 4 . During the OER process, the copper was partially leached and meantime doped into the in-situ generated Co(OH) 2 with SO 4 2− adsorption, while only oxides were discovered in counterparts of mono-metal sulfides. As a result, the SO 4 2− @Cu doped Co(OH) 2 catalyst exhibited superior OER performances, with low overpotentials of 211/272 mV to achieve the current densities of 10/100 mA cm −2 , exceeding the counterparts reconstructed from mono-metal sulfides. Experimental and theoretical results suggested that the in situ generated Cu doped Co(OH) 2 possessed thin and loosely layered structure with expanded lattice spacing (lattice spacing expanded from 0.28 nm to 0.46 nm) due to the SO 4 2− adsorption, making the intermediates more accessible to the active centers. In addition, the catalyst surface changed from hydrophobicity to super hydrophilicity , which greatly accelerated the mass transfer. This work indicated that the in-situ reconstruction process was greatly influenced by the interactions between metal sites and sulfide species, directly influencing the OER performances of the reconstructed catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 21
·4870
·
IF 3.057
Xiao Li,Jun Li,Ying Zhang,Peng Zhao,Ruyan Lei,Baige Yuan,Manman Xia
Ni(OH)2derived from an MOF template was synthesized as an electrode material for supercapacitors. The electrochemical performance of the electrode was adjusted by effectively regulating the morphology of Ni(OH)2. The evolution of electrochemical performance of the electrode with morphology of Ni(OH)2was highlighted in detail, based on which honeycomb-like Ni(OH)2was successfully synthesized, and endowed the electrode with outstanding electrochemical performance. For the three-electrode testing system, honeycomb-like Ni(OH)2exhibited a very high specific capacitance (1865 F·g−1at 1 A·g−1, 1550 F·g−1at 5 mV·s−1). Moreover, it also presented an excellent rate capability and cycling stability, due to 59.46 % of the initial value (1 A·g−1) being retained at 10 A·g−1, and 172% of initial value (first circle at 50 mV·s−1) being retained after 20,000 cycles. With respect to the assembled hybrid supercapacitor, honeycomb-like Ni(OH)2also displayed superior electrochemical performance, with a high energy density (83.9 Wh·kg−1at a power density of 374.8 W·kg−1). The outstanding electrochemical performance of Ni(OH)2should be attributed to its unique honeycomb-like structure, with a very high specific surface area, which greatly accelerates the transformation and diffusion of active ions.Keywords:honeycomb-like structure;Ni-MOF;Ni(OH)2;electrode material;supercapacitor
研究领域:
材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 12
·6772-6783
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IF 1.938
Hou Xiaoshuo,Yang Ming,Yu Hui,Yang Ying,Li Dan,Dong Xiangting
In this work, a 3D Z-scheme photocatalyst Ag/AgBr/Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (Ag/AgBr/ZVO) was synthesized by a hydrothermal method, and a subsequent surface deposition-optical reduction technique. The prepared flower-like Ag/AgBr/ZVO was characterized by scanning election microscopy (SEM), x-ray powder diffraction (XRD), x-ray photoelectron spectroscopy (XPS), UV-vis spectrophotometry, N 2 adsorption-desorption isotherm based on Brunauer-Emmett-Teller (BET) theory, and electrochemical tests. The photocatalytic degradation performance of the catalyst was investigated by the degradation of methylene blue (MB) dye by visible light irradiation. Compared with bare Zn 3 V 2 O 7 (OH) 2 ·2H 2 O (ZVO) nanoflowers, the photocatalytic effect of the 3D Z-scheme heterojunction Ag/AgBr/ZVO was significantly enhanced. The catalyst of 2h-Ag/AgBr/ZVO exhibited the strongest photocatalytic activity, of which the MB degradation rate is about 98.8% in 100 min, which was about five times that of pure ZVO. The increase in the photodegradation rate is ascribed to the accelerated interface charge-transfer process, the faster photogenerated carrier separation rate and the enhancement of visible light absorption. In view of the trapping of the reaction intermediate and the electron spin resonance (ESR) measurement, we propose a possible Z-scheme photocatalytic mechanism. This improved visible-light response likely originates from a synergistic effect of the different components. This work offered an ideal method for producing stable, efficient, and recyclable photocatalysts suitable for use in the visible light range.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Energy Storage
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2024
·
IF 8.9
Jing Sun,Jing Li,Yuanyuan Liu,Kaihua Liu,Meiri Wang,Hongtao Cui
Ni(OH) 2 is a typical battery-type material with high theoretical specific capacity. Its two inherent disadvantages, namely slow electrochemical dynamics and extremely poor cycling life, have become stumbling blocks for its application in supercapacitors (SCs). The hitherto slow advancement in the electrochemical performance of Ni(OH) 2 implies a misunderstanding of its electrochemical mechanism and inappropriate building strategies of the structure. In this work, we build a structure of porous carbon-confined α-Ni(OH) 2 using Mg-MOF-74 as a sacrificial template. The carbon matrix acts as the conductive network and the porous substrate for self-healing the damaged structure caused by the dissolution-precipitation of α-Ni(OH) 2 and suppressing the dissolution-recrystallization behavior of β-Ni(OH) 2 transformed from α-Ni(OH) 2 . Due to the thin sheet morphology and the retention of this morphology throughout cycling, the porous carbon-confined Ni(OH) 2 demonstrates excellent high-rate performance, and an ultra-long cycling life comparable to the carbon materials of electrical double layer capacitors (EDLCs). The assembled SCs also exhibit a high power density of 10.8 kW kg −1 and an energy density of 40.9 Wh kg −1 . The positive result in this work may offer a promising strategy for obtaining SCs with both high energy and power densities.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Fubao Gong,Jun Shen,Runhua Gao,Xiong Xie,Xiong Luo
A novel organic–inorganic Mg(OH) 2 /silane surface layer has been developed for corrosion protection of AZ31 magnesium alloy. The results of electrochemical impedance spectroscopy (EIS), the immersion tests, Fourier-transform infrared spectroscopy (FTIR) and sellotape tests showed that the Mg(OH) 2 /silane-based composite surface layer possessed excellent corrosion resistance and very good adhesion due to the formation of Si–O–Mg bond between Mg(OH) 2 layer and silane layer. Electrochemical impedance spectroscopy tests results indicated that for the long-term corrosion protection of AZ31 the increase of the curing temperature improved the impedance of the composited layer when the curing temperature was lower than 130 °С. However, the impedance of the composited layer deceased when the curing temperature was more than 130 °С due to the carbonization of the silane layer.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Yi Wu,Anqi He,Da Li,Limin Yang,Yizhuang Xu,Yukihiro Ozaki,Isao Noda
This study investigates single-crystal structures of Lu3+/erythritol and nine rare earth–glycerol complexes, revealing deprotonation of normally inert OH groups via μ2-bridging (so-called DIOμ2 phenomenon). The pH drops upon alditol addition correlate with the deprotonation extent, showing increased deprotonation with decreasing lanthanide ionic radius (lanthanide contraction) and exceptionally high deprotonation for Sc3+. In all the rare earth/alditol complexes with the DIOμ2 phenomenon, two μ2-bridges merge into an M2O2 cluster (M is a rare earth ion) that is not very stable due to the Coulombic repulsion between two M3+ and between two O–. To stabilize the M2O2 cluster, the formation of more auxiliary five- and six-membered chelating rings between rare earth ions and alditol ligands is needed. Increment of the number of auxiliary five- and six-membered chelating rings favors the DIOμ2 reaction. This is the reason why the DIOμ2 reaction shows a progressively enhanced tendency when the alditol ligands change from myo-inositol to glycerol to erythritol and galactitol. The reaction is endothermic, as an increased temperature enhances deprotonation. The above results may be useful in the rational design of catalysts that efficiently activate inert OH bonds and facilitate related chemical processes.
研究领域:
无机化学
·
配位化学
·
晶体学
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物理化学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Peiyun Zhou,Haokun Pan,Guangtong Hai,Xiang Liu,Xiubing Huang,Ge Wang
In this work, nickel foam supported CeO 2 -modified CoBDC (BDC stands for terephthalic acid linker) metal-organic frameworks (NF/CoBDC@CeO 2 ) are prepared by hydrothermal and subsequent impregnation methods, which can be further transformed to NF/CoOOH@CeO 2 by reconstruction during the electrocatalytic test. The obtained NF/CoOOH@CeO 2 exhibits excellent performance in electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) because the introduction of CeO 2 can optimize the electronic structure of the heterointerface and accelerate the accumulation of *OH. It requires only a potential of 1.290 V RHE to provide a current density of 50 mA cm −2 in 1.0 M KOH + 50 mM HMF, which is 222 mV lower than that required in 1.0 M KOH (1.512 V RHE ). In addition, density-functional theory calculation results demonstrate that CeO 2 biases the electrons to the CoOOH side at the heterointerface and promotes the adsorption of *OH and *HMF on the catalyst surface, which lower the reaction energy barrier and facilitate the electrocatalytic oxidation process.
研究领域:
材料科学
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电化学
·
理论计算
✓ 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）