APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Shanyong Chen,Shiyan Wang,Panpan Hao,Muhong Li,Yu Zhang,Jia Guo,Weiping Ding,Min Liu,Jinlan Wang,Xuefeng Guo
Development of high-performance and stable electrocatalysts for hydrogen evolution reaction (HER) is crucial for hydrogen economy. Inspired by hydrogen evolution behavior on hydrogenase enzyme, in which the azadithiolate bridging ligand of active center facilitates fast proton shuttling and catalytic turnover, here we present an efficient approach to enhance both HER kinetics and stability realizing on an IrNi@N,O-C catalyst with individual IrNi nanoparticle separately confined in N and O co-doped carbon (N,O-C) nanocage. Experimental and theoretical investigations indicate that the N,O-C nanocage provides proton-adsorbing functionality on raising H* coverage over IrNi active centers, resulting in much accelerated HER kinetics. The IrNi@N,O-C presents superior HER performances compared to all reported Ir-based catalysts, with overpotential of 22 mV at 100 mA cm −2 , ultrahigh mass activity of 9.82 A mg Ir −1 (−0.050 V vs. RHE) and outstanding durability of 200 h at large current density. This work affords fresh insights/strategies for design of high-performance electrocatalysts
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APL Materials
·
2024
·Vol. 12
·期 4
·
IF 5.3
Lin Jia,Wang Shuai,Jin Hua,Cui Shuyuan,Wang Rongwen,Yang Yihang,Huang Guimei,Wang Jinhuo
The preparation of ceramic materials with complex porous structures through photopolymerization-based 3D printing requires the development of stable and printable slurries. In this study, zirconium acetylacetonate was incorporated into the thiol vinyl organosilicon prepolymer to create a photosensitive Si–Zr–O–C slurry. Regarding the natural bone structures and the Tyson polygon principle, a gradient pore structure was designed and then printed using a digital light processing 3D printer. After printing, the effects of sintering temperatures on the phase composition and structure of Si–Zr–O–C ceramics were systematically investigated. Subsequently, a comparative analysis of structure and properties was performed on sintered samples with different zirconium acetylacetonate contents. The results revealed that the sample containing 30 wt. % zirconium acetylacetonate exhibited a higher compressive strength of 9.70 ± 0.28 MPa and a lower room temperature thermal conductivity of 0.528 W m −1 K −1 . This study confirmed the significant potential of using 3D printing technology to prepare Si–Zr–O–C precursor ceramics with a porous structure.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jinnuo Yang,Wenqiang Ai,Lingke Li,Shilong Dong,Jiahui Lv,Ruiqi Wang,Yang Liu,Lei Zu,Huiqin Lian
Sodium-ion batteries (SIBs) offer great viability for extensive energy storage due to their abundance, low cost, and excellent safety. In this study, we investigate the relationship between P–O–C bonds content and electrochemical performance of black phosphorus–hard carbon–carbon nanotubes (BP-HC-CNTs) composite anode. A series of composites are prepared via ball milling, in which the relative P–O–C bonds content is modulated by varying the HC to CNTs ratio, and the effect of different relative P–O–C bond contents on the electrochemical performance of the materials is systematically investigated. The findings indicate that tuning the HC to CNTs ratio alters the chemical bonding degree between phosphorus and carbon, specifically the P–O–C bond content, which positively correlates with enhanced electrochemical performance. Notably, the composite with the highest P–O–C content (36 %) exhibits superior performance compared to those with lower bond contents: The specific capacity is approximately 2.9 times higher after 600 cycles at 6.0 A g ⁻¹ , and after 2000 cycles at 15.0 A g ⁻¹ , it is about 5.7 times higher. These results demonstrate excellent rate capability and cycling stability. Therefore, we propose that adjusting the hard carbon/carbon nanotubes ratio effectively regulates P–O–C bonds formation, which is essential for improving interfacial stability and electrochemical kinetics.
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
Journal of the Australian Ceramic Society
·
2024
·
IF 1.8
Lin Jia,Wang Shuai,Yang Yihang,Huang Guimei,Wang Jinhuo
In this study, Zr-modified Si-O-C precursor ceramics were prepared using three-dimensional (3D) printing. Ceramic sintering was completed by printing four precursors containing different zirconium acetylacetone contents. Comparative analysis was conducted on the ceramic yield, size shrinkage, mechanical properties, and microstructure. The results showed that the ceramic yield and size shrinkage of the four samples were increased with the increasing zirconium acetylacetone contents. The sample containing 30 wt% zirconium acetylacetone exhibited good compressive performance, with a compressive strength of 50.2 ± 0.6 MPa. Cracks were observed on the surface of samples containing 40 wt% zirconium acetylacetone, while those containing 10, 20, and 30 wt% zirconium acetylacetone were relatively intact. Therefore, a stable Si-Zr-O-C precursor ceramic with good mechanical properties, which can be used for 3D printing, was obtained.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 25
·9789-9796
·
IF 8.262
Xihui Nan,Chaofeng Liu,Changkun Zhang,Wenda Ma,Kan Wang,Zhuoyu Li,Guozhong Cao
V2(PO4)O/C is a promising new anode material for lithium ion batteries with excellent electrochemical properties, synthesized by a facile one pot hydrothermal method, followed by a two-step calcination process. The composite can deliver a reversible capacity of 445 mA h g−1, 409 mA h g−1 and 382 mA h g−1 at 1.0, 1.5 and 2.0 A g−1. The capacity retentions of V2(PO4)O/C cycled at 1 and 5 A g−1 for 200 cycles are 90% and 80%, respectively. The excellent electrochemical properties are mainly attributed to the following three factors: (1) face-sharing [VO6] octahedral arrays endow the crystal with a high intrinsic electronic conductivity; (2) the good lithium ion diffusion coefficient of the material contributes for reducing electrochemical and concentration polarization in the charge–discharge process; and (3) porous microstructure and nanoscale particles not only permit effective contact between the electrolyte and active material, but also provide more space to accommodate volume change during the discharge/charge processes. The results in this study provide convincing evidence that V2(PO4)O/C has significant research value for future practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17644-17651
·
IF 3.201
Shaobo Li,Tao Zhu,Lichun Dong,Mingdong Dong
Heteroatom doping has been demonstrated to be an effective way to tune the properties of nanomaterials including chemical reactivity and electronic and optical performance. In this study, rGO/g-C3N4 and boron doped rGO/g-C3N4 (B-rGO/g-C3N4) nanocomposites were fabricated via a rapid plasma treatment method, and their photocatalytic performance under visible light radiation was examined. The results showed that the photocatalytic efficiency of B-rGO/g-C3N4 for rhodamine B degradation can be 50% higher than that of rGO/g-C3N4 at an optimum rGO loading of 5 wt%. XPS and FTIR analyses indicated the enhanced C–O–C covalent bonding between rGO and g-C3N4 in B-rGO/g-C3N4, and the optical characterization demonstrated that it could further improve the separation of the photo-generated chargers and narrow the bandgap of the nanocomposite. This work provides an idea that boron doping could be an effective way to promote the chemical interaction between different components in composite materials, which is important in designing and developing new functional nanomaterials.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Song,Hanqing Zhao,Jianqi Ye,Mengmeng Kang,Siyu Miao,Zhong Li
Ti–O–C channels for ultrafast sodium storage were constructed in N/S-co-doped TiO2–C nanofibers, which deliver a high rate performance of 181.9 mAh g–1 at 5 A g–1 after 3000 cycles. The existence of Ti–O–C bonds at the interface of TiO2–C phases was revealed by synchrotron radiation X-ray absorption spectra. Based on this, first-principles calculations further verified the low energy barrier for Na+ insertion/extraction in the Ti–O–C channels formed by the intimately integrated graphite layer with TiO2 near the surface. In addition, surface defects induced by heteroatoms accelerate the Na+ mass transfer through the pathway from the carbon surface to the Ti–O–C channel.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Su Wang,Qifang Sun,Chen Li,Dongge Wang,Yue Ma,Hongzhou Zhang,Xixi Shi,Lianqi Zhang,Dawei Song
Given the high combustion or explosion potential of liquid electrolyte, polymer electrolytes have attracted intensive attention due to high safety, compatible interface and flexible processability. However, the related low ionic mobility remains an issue for related wide application. Herein, a crosslinked polymer electrolyte (abbreviated as PMEP) comprising abundant oxygen-contained groups (C-O-C/C=O) is developed. With the crosslinking agent of ethoxylated trimethylolpropane triacrylate (ETPTA), a high transference number ( t Li + =0.69) is obtained since C-O/C=O are conducive to the transfer of Li ions. Specifically, C=O group exists in individual monomers in order to be applicable to high voltage cathode, therefore, a criss-cross network containing abundant sites conducive to ion transport is constructed and rapid ion transfer as well as enhanced mechanical strength can be realized even in high potential system. With the coordination effect of C-O and C=O, PMEP exhibits rapid Li ion transfer and a wide electrochemical stability window of 5.1 V. As for Li//Li symmetrical cell, a stable voltage profile with slight polarization of 60 mV is displayed for over 550 h at 1 mA cm −2 . After assembled with LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode, a high discharge specific capacity of 190.6 mAh g −1 is delivered and the capacity retention reaches 86 % at 0.1C for 100 cycles. This work provides a promising method for designing high-performance polymer electrolytes for lithium metal batteries.
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
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 11
·15174-15181
·
IF 4.672
Yang Liu,Xuesong Cai,Dinggui Chen,Yan Qin,Yuan Chen,Jinxiang Chen,Chenglu Liang
Summary The large-scale applications of energy storage system via lithium-ion batteries (LIBs) put forward demands for high capacity, high safety, and low cost of materials. Covalent organic polymers have attracted extensive attention because of their high capacity, flexible structural design, high safety, abundance, and low cost. Here, 2,3,5,6-tetraamino-p-benzoquinone and hexaketocyclohexane octahydrate were chosen as monomers to construct the covalent organic framework (TH-COF) cathode materials with active C=O and C=N groups. The TH-COF was further composed with reduced graphene oxide (rGO) and the prepared TH-COF/rGO cathode provided a capacity of 135 mAh g −1 after 600 cycles at 1 C current density. In addition, after 100 cycles, the cathode delivered capacities of 118 and 73 mAh g −1 at the high current densities of 5 C and 20 C, respectively, displaying superior rate performances. The TH-COF/rGO electrode exhibited high capacity and stability, making it a promising cathode material for the next generation LIBs.
研究领域:
材料科学
·
能量存储
·
电化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 3
·2211335
·
IF 19.924
Lingbo Liu,Ling Lei,Keni Zeng,Kangbing Wu,Nianjun Yang
Red phosphorus (RP) is a promising electrochemical sensing material owing to its abundant surface groups and reactive sites. In this study, a sodium dodecyl sulfate-assisted phosphorus-amine approach is employed to tune surface chemistry of RP nanoparticles. During the transition of the polyphosphorus-amine anion to RP, the cleavage of P O P bond and the formation of P O C bond are monitored by in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy. The formed P O C bonds that are originated from the P O reactive sites are theoretically revealed with the density functional theory calculations, charge density difference, and X-ray photoelectron spectroscopy. The energies of optimized aromatic and aliphatic P O C bonds are −2.51 and −2.65 eV, respectively. To explore electrochemical sensing applications, RP nanoparticles are in situ grown on single-walled carbon nanotube (SWCNT). Such a stable RP/SWCNT suspension is applied to fabricate the RP/SWCNT integrated arrays via a template-filtration method. Such an array is efficient for sensitive and selective monitoring of p-phenylenediamine on hair dyes. This study provides insights into surface chemistry of RP, its roles in electrochemical sensing applications, and an approach to produce high-performance RP sensors at large scales.
研究领域:
材料科学
·
电化学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Tingting Dai,Xuesong Li,Liying Wang,Xijia Yang,Yang Gao,Qixian Zhang,Wei Lü
Ni-Co-O material is the most representative polymetallic compound and has exhibited excellent energy storage properties. However, the high cost of composite restricts the practical application of Ni-Co-O material. In this paper, a simple and low-cost method is used to grow Ni-Co-O/C nanoarrays directly on a conductive matrix. The results show that the three-dimensional nanoflower-like Ni-Co-O/C composite has better electrochemical performance than that of the nanosheet Co-O/C binary composite. This microstructure provides a shorter path for electron transport, making the material high electron transport efficiency. The specific capacitance of Ni-Co-O/C/AC asymmetric supercapacitor can reach 128.75 mF cm −2 at 2 mA cm −2 . Under the condition of 20 mA cm −2 , after 4000 cycles of charge and discharge, the capacitance retention rate is maintained at 99.8 %. This 3D flower-like structure not only helps provide an open framework and rapid ion diffusion, but also exposes more active sites and enhances charge storage performance. Ni-Co-O/C calcined in nitrogen shows more abundant defect structure and larger specific surface area, which is further conducive to Ni-Co-O/C electrodes to expose more active sites and enhance the rapid diffusion and reaction of electrolyte ions .
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
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xin Guo,Zhijia Sun,Hao Ge,Qin Zhao,Tingting Shang,Yang Tian,Xi-Ming Song
Nanocomposites of manganese oxides and carbonaceous materials with strong interfacial connection hold extraordinary potential as high-performance electrode materials for energy storage devices. However, the interfacial interaction between manganese oxides and carbon has not been sufficient elucidated despite it may affect the chemical composition and morphology of the electrode materials and thus impact on the electrochemical performance. Herein, through regulating the amount of oxygen-containing functional groups on the surface of multi-walled carbon nanotubes (MWCNTs), a series of MnO x /MWCNTs nanocomposites with different compositions and morphologies are successfully synthesized. The Mn–O–C bonds, which can act as an ultrafast electron transfer path, are formed in the MnO x /MWCNTs nanocomposites. The influence of the amount and type of oxygen-containing functional groups in MWCNTs on the formation of Mn–O–C bonds, the composition and morphology of the nanocomposites is revealed clearly. The nanocomposite with the highest number of Mn–O–C bonds in the prepared MnO x /MWCNTs, which feature a structure with the binary manganese oxides (38% MnO 2 and 62% Mn 3 O 4 ) nanosheets growing vertically and uniformly on the oxidized MWCNTs, give the best electrochemical properties with high capacity (1353.2 mAh g −1 at 0.1 A g −1 ), outstanding rate capability (384.9 mAh g −1 at 20 A g −1 ), and durable long-term cyclability (1000 cycles with 70% retention at 2 A g −1 ). The quantitative kinetic analysis indicates that over 60% of the charge storage is pseudocapacitive. The distinct interfacial design strategy presents a new route to synthesis transition metal oxides/carbon hybrids with efficient energy storage and conversion.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）