Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 18
·9049-9057
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IF 11.301
Qifeng Yang,Peng Jin,Bing Liu,Liang Zhao,Jiahao Cai,Zhan Wei,Shouwei Zuo,Jing Zhang,Lai Feng
Encapsulating metallic nanoparticles (NPs) with a graphitic carbon shell is a promising strategy to achieve highly efficient and stable electrocatalysts for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and electrochemical overall water splitting (OWS). This work presents a simple and facile synthesis of graphitic carbon coated NixRuy alloys. The optimized catalyst (e-Ni0.6Ru0.4@C) displays an ultrafine morphology and outstanding HER and OER activities in alkaline media, which are among the best reported so far for various carbon-based electrocatalysts. Remarkably, the e-Ni0.6Ru0.4@C‖e-Ni0.6Ru0.4@C pair needs a low cell voltage of 1.51/1.62 V for driving OWS to reach 10/100 mA cm−2, far outperforming the benchmark electrode pair Pt/C‖RuO2. As expected, this carbon-based catalyst also exhibits superior durability as compared to that of precious catalysts. The experimental evidence combined with density functional theory (DFT) computations thus demonstrates for the first time that minor Ru alloying enables not only the morphological modulation but also the fine electronic modification of the catalyst, which both facilitate the overall electrochemical reactions on the carbon shell surface. Thus, our results may further shed light on how to design and optimize carbon-based electrocatalysts to achieve enhanced catalytic performance for OWS.
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
Molecular Catalysis
·
2025
·
IF 4.9
Xinping Wu,Mengting Liu,Hongyao Zhao,Danhong Shang,Yanyun Wang,Feng Zeng,Jialing Shen,Jianming Pan,Xiang Liu,Yiyan Song,Fu Yang
Widespread industrial application of bisphenol A (BPA) has produced large amounts of contaminated wastewater, and its accumulation in the environment has threatened human health. In this study, MnOOH nanorods were deposited with the polydopamine layer containing incorporated Co precursor, which was derived to obtain carbon shell confined Co 3 O 4 onto Mn 2 O 3 nanorods. The controlled calcination temperature was optimized to improve the active state of metal species. Carbon shells mediate the electronic interactions between Co 3 O 4 and Mn 2 O 3 , triggering more Co(II/III) redox cycles and an enhanced fraction of Mn(III) along with more oxygen vacancies in Mn 2 O 3 . In addition, more pyridinic N species were generated in the carbon shell of Mn@C/Co-600, affording better affinity to the polar contaminants and peroxymonosulfate (PMS). Therefore, these characters in Mn@C/Co-600 caused the accelerated reaction cycles in the PMS activation and BPA degradation. Compared with other catalysts, Mn@C/Co-600 showed the highest degradation efficiency of bisphenol A (BPA) with the rate constant of 0.827 min −1 , which was up to 30 times higher than that of Mn@C/Co-Cl-600 (0.027 min −1 ). The anions interference effect on BPA degradation follows the order of Cl − (0.925 min −1 )
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 44
·17988-17997
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IF 5.101
Yi Lu,Jiang-ping Tu,Chang-dong Gu,Xiu-li Wang,Scott X. Mao
Nickel phosphide (Ni2P) hollow spheres were facilely prepared via an organic-phase strategy using nickel(II) acetylacetonate as a metal precursor, trioctylphosphine as a phosphorus source, and octyl ether as solvent. A core/shell-structured Ni2P@C nanocomposite was grown in situ by employing oleylamine and 1-octadecene as capping agent and solvent, respectively, and the hollow Ni2P spheres were homogeneously wrapped by an amorphous carbon shell. The reversible capacity of the Ni2P@C nanocomposite after 50 cycles is 435 mAh g−1 at 0.1 C and 303 mAh g−1 at 0.5 C, respectively, much higher than that of Ni2P (184.2 mAh g−1 at 0.1 C and 123 mAh g−1 at 0.5 C). These improvements are attributed to the carbon shell, which can enhance the conductivity of Ni2P, suppress the aggregation of active particles, and increase their structure stability during cycling.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Hui Ning,Xiaoshan Wang,Wenhang Wang,Qinhu Mao,Zhongxue Yang,Qingshan Zhao,Yan Song,Mingbo Wu
Electroreduction of carbon dioxide (CO 2 ) to ethylene (C 2 H 4 ) is one of the most feasible approaches to reduce the carbon emissions and enhance carbon dioxide utilization , whereas the lack of efficient catalysts impedes the scale application. Cuprous oxide (Cu 2 O) is a promising catalyst for the formation of C 2 H 4 but with unsatisfied selectivity and stability. Herein, we prepared Cu 2 O/nitrogen-doped carbon shell (Cu 2 O/NCS) composite and employed it in the production of C 2 H 4 from CO 2 electroreduction. The ultra-thin NCS with graphene-like structure was prepared from petroleum asphalt by template method . The cubic Cu 2 O nanocrystals are uniformly dispersed on the surface of NCS with ca. 150 nm diameters. Cu 2 O/NCS loaded on glass carbon electrode showed a high faradaic efficiency of C 2 H 4 (24.7%) at −1.3 V ( vs . reversible hydrogen electrode) as well as remarkable stability. The excellent performance of Cu 2 O/NCS is attributed to the high dispersion of cubic Cu 2 O nanocrystals and the abundant pyridinic-N moieties in NCS. This work provides a new strategy to improve the selectivity and durability of Cu 2 O for production C 2 H 4 from electrocatalytic CO 2 reduction by fabricating composites with nitrogen-doped carbon materials.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Min Zhao,Dong-Lin Zhao,Hui-Xian Yang,Xin-Yao Han,Ya-Jing Duan,Xin-Min Tian,Wen-Jie Meng
Germanium-based materials are considered to be an alternative material for high energy density lithium-ion battery anodes due to their superior theoretical capacity. However, the severe volume expansion during the lithium insertion and the easily agglomerated tendency of Ge nanoparticles become the key obstacles to the stable cycle and capacity retention of Ge anodes. Herein, we designed a double-layered protective structure in which the cubic hollow Ge@C hybrids are uniformly dispersed on reduced graphene oxide sheets (Ge@C-rGO) through conventional dopamine-coated precursor and subsequent carbothermal reduction processes. In the synthesized Ge@C-rGO hybrids, the large-area rGO sheets cooperate with the amorphous carbon layer to accommodate and buffer the volume expansion of Ge particles, and to ensure that the Ge nanoparticles are in a separated state to the utmost extent. The Ge@C-rGO electrode which is employed in lithium-ion battery owns the reversible capacities of 1183 mAh·g −1 at the specific current of 100 mA g −1 and 710 mAh·g −1 at 1 A g −1 for 200 cycles. In addition, it exhibited good cycle stability, rate reversibility and electronic conductivity, and is a potential anode material with high performance and long-cycle capability.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6626-6636
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IF 2.047
Huang Jiajie,Li Xiaoyue,Jiang Shiqi,Liu Cheng,Lu Mixue,Yang Yefeng
Cobalt diselenide (CoSe 2 ) has stimulated increasing research interest in the field of sodium-ion batteries (SIBs) because of its relatively high theoretical capacity and affordable cost. Nevertheless, its sodium storage performance and practical application are largely hampered by inferior electrical conductivity, severe volumetric variation, and pulverization during the repeated cycling process. In this work, we report the fabrication of hybrid spheres of Fe-doped CoSe 2 embedded in a carbon shell (denoted as Fe-CoSe 2 /C), which uses a facile solvothermal and subsequent carbonization/selenization approach. The carbon shell produced from the precursor of CoFe-glycerate (CoFe-Gly) effectively enhances the electrical conductivity and mitigates the structural stress, while the modulated doping of certain amounts of Fe in CoSe 2 facilitates the transfer of electrons and the diffusion of ions in the composite. As a result, the optimal Fe-CoSe 2 /C-2 electrode exhibits good rate performance (388 mAh g −1 at 5 A g −1 ) and outstanding cycling durability (501 mAh g −1 at 1 A g −1 after 500 cycles, retention of 93.5%), suggesting the great potential of Fe-CoSe 2 /C hybrid spheres to serve as promising anode materials for high-performance SIBs. Graphical Abstract
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 3
·1547-1559
·
IF 12.732
Ran Liu,Gaiping Du,Bin Liao,Weixin Xiao,Zhenguo An,Jingjie Zhang
Due to their multiple dissipation mechanisms, low density and easily tailored impedance matching, heterogeneous hollow structures are promising candidates for microwave absorbents towards wideband absorption and lightweight design. In this work, a new type of hollow microspheres with a porous carbon shell embedded with crystalline FeCo alloy nanoparticles have been prepared via a stepwise spray drying–calcination strategy. The effects of both the FeCo/C molar ratio and the calcination temperature on the structure and property of the porous hollow microspheres (PHMs) have been studied. It is found that the effective absorption bandwidth of the as-prepared FeCo/C PHMs surpassed 7.44 GHz at a matching thickness of 2.64 mm, which covers the full Ku-band. Moreover, with an elevated calcination temperature, high microwave absorbing performance can be achieved at a much reduced matching thickness. A probable absorbing mechanism has been proposed involving the synergistic effect of the hollow interior, the porous shell structure, and the electric and magnetic dissipation due to the coexistence of carbon and magnetic metals. This work opens a new pathway to synthesize microwave absorbents with a heterogeneous hollow structure, and may shed some light on the design and controlled preparation of other hollow structures with various shell compositions.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Yu Jiang,Qian Wang,Sisi Tian,Zhenhua Luo,Dong Wang,Yun Bai,Wu Lu,Tong Zhao
A novel NaF phase change microcapsule with a carbon shell (NaF@C microcapsule) was prepared by a simple approach. The carbon shell was synthesized by carbonization of a resole-type phenolic resin shell, which was encapsulated onto the surface of NaF particles by a simple phase separation process induced by tetraethoxysilane. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis were used to characterize the morphology, composition, crystal phase, and thermal properties of the microcapsules. The size of the NaF@C microcapsule was 3–5 μm with a core–shell structure. DSC results showed that the melting point of the prepared NaF@C microcapsule was 988 °C, and the enthalpy value was 192 J/g. The prepared NaF@C microcapsules retained the powder morphology after 30 times of heat treatment at 1100 °C, with no NaF leakage detected, and the micromorphology remained stable, presenting good thermal stability. The NaF@C microcapsules can be used in the fields of thermal protection and thermal management in extreme high-temperature environments such as aerospace and solar energy.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Min Jiang,Rui Dong,Hanxiao Liao,Yong Liu,Yuan Wang,Pengfei Tan,Jun Pan
Rational fabrication of an electrocatalyst with excellent stability, conductivity, and activity is urgently demanded for oxygen evolution reaction (OER). In this work, Ru-regulated hierarchical CoFe/CoFe 2 O 4 nanoparticles with graphitic carbon shells were successfully fabricated via self-assembling and vapor reduction strategies. Our investigation uncovers high concentrations of octahedral Co 3+ sites in electrocatalysts can be triumphantly acquired via moderate Ru doping, which could give rise to excellent electrocatalytic activities during OER. In addition, the design of CoFe alloys and graphitic carbon shells can compensate for the weak conductivity of cobalt ferrites. Based on the intrinsic stability, improved conductivity and activity, the as-prepared electrocatalyst yields a low overpotential of 237 mV at 10 mA cm −2 and a small Tafel slope of 47 mV dec −1 in 1.0 M KOH electrolyte, exhibiting outstanding electrocatalytic activities for OER.
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
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 28
·285402
·
IF 3.551
X T Zhang,Y F Yuan,M Zhu,G C Cai,Z W Tong,Z Y Yang
Low electronic conductivity and large volume variation result in inferior lithium storage performance of ZnO. To overcome these shortcomings of ZnO, herein ZnO nanoparticles are encapsulated in resorcinol–formaldehyde resin-derived hard carbon and then further assembled into a 3-dimensional mesoporous framework structure using a polyvinyl pyrrolidone-derived soft carbon network. The synthesis methods include the polymerization of resorcinol–formaldehyde resin and a polyvinyl pyrrolidone-boiling method. ZnO@dual carbon has af large specific surface area (153.7 m2 g−1) and high porosity. It exhibits excellent cycling performance and high rate capability. After 350 cycles at 500 mA g−1, the ZnO@dual carbon still delivers a discharge capacity of 701 mAh g−1 while the actual discharge capacity of ZnO reaches 950.9 mAh g−1. At 2 A g−1, ZnO@dual carbon delivers the average discharge capacity of 469.6 mAh g−1. The electrochemical performance of ZnO@dual carbon is remarkably superior to those of ZnO@single carbon, pure carbon and pure ZnO nanoparticles, demonstrating the superiority of the dual carbon-assembly structure. This composite structure greatly improves the structural stability of ZnO, enhances its electron conductivity and overall electron transport capacity; which facilitates electrolyte penetration and Li ion diffusion, leading to improved cycling stability and good rate capability.
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
CARBON
·
2018
·
IF 7.082
Zhiwei Li,Hongyu Mi,Lang Liu,Zhengyu Bai,Jinping Zhang,Qing Zhang,Jieshan Qiu
Core-shell hybrid precursors (ZIF-8/ PP -SiO 2 ) engineered by zeoliticimidazolate framework (ZIF-8) depositing on the polyelectrolyte-decorated silica ( PP -SiO 2 ) are successfully transformed into unusual N-rich hollow carbon shell frameworks (NHCSFs) with adjustable physicochemical properties by the layer-by-layer assembly, interface engineering and subsequent carbonization , which is the first example that systematically elucidates the formation and structure-property correlation of unique three-dimensional (3D) carbon frameworks. The optimal NHCSF-3 displays superior performance with high capacitance approaching 253.6 F g −1 at 1 A g −1 , excellent rate capability delivering 79% capacitance retention after a 50-fold increase of the rate, and long lifetime (92.1% retention for 20000 cycles). The studies on alkaline and neutral NHCSF-3//NHCSF-3 supercapacitors demonstrate that the latter with high voltage up to 1.6 V using a Na 2 SO 4 electrolyte can deliver high energy density of 13.3 Wh kg −1 . The distinctly enhanced performance illustrates that, except for the factors such as morphology, surface area, pore volume , and N-doping level, hierarchical porosity also significantly boosts electrochemical properties of the materials because of providing efficient charge/mass transport. Overall, this research provides an efficient platform for precisely modulating the structure of MOF-based carbons to develop multifunctional hollow architectures for satisfying enormous demands in upcoming energy devices.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hui Li,Jiao Peng,Zhenyu Wu,Xiaolin Liu,Peng Liu,Baobao Chang,Xianyou Wang
SiO x -based anode materials (0 < x < 2) have been regarded as an appealing candidate for anode material of commercial Lithium-ion batteries accounting for their ultrahigh theoretical capacity and low cost. However, its large-scale applications have been hampered by the serious volume expansion during repeated cycles, low intrinsic conductivity and unsatisfactory initial Coulombic efficiencies. Herein, to address these inherent deficiencies, a hierarchical SiO x -based anode with double-layer coatings of Sn inner layer and N-doped carbon outer shell is elaborately designed by a facile two-step hydrolysis process and polymer coating technology . Benefiting from the “synergistic effect” between Sn and SiO x at different working potentials and a well-designed double-layer coating structure, the resultant SiO x /C@Sn@NC anode displays excellent electrochemical properties, including an enhanced initial Coulomb efficiency (73.3%) efficiency, higher reversible capacity (991 mAh g −1 ) and superior long lifespan. Moreover, comprehensive characterization based on the reaction kinetics and structural stability proved that such enhanced ICE and cycling stability of anode material stem from its unique double-layer coating structure and multiple active components, which can significantly improve the diffusion of ion and charge transport, stabilize solid-electrolyte interphase (SEI) layer and absorb the expansion stress of electrode. Therefore, this study provides an efficient and feasible strategy to overcome the limitations of high-capacity SiO x -based anode materials via hybridization design with various active components and a double-layer coating strategy.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）