Shanghai Institute of Materials Genome

Shanghai, China

Shanghai Institute of Materials Genome

Shanghai, China
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Zhong H.,CAS Shanghai Institute of Ceramics | Zhong H.,University of Chinese Academy of Sciences | Wang Z.,CAS Shanghai Institute of Ceramics | Zhou H.,CAS Shanghai Institute of Ceramics | And 5 more authors.
Ceramics International | Year: 2017

In the present study, a novel liquid polycarbosilane (LPCS) with a ceramic yield as high as 83% was applied to develop 3D needle-punched Cf/SiC composites via polymer impregnation and pyrolysis process (PIP). The cross-link and ceramization processes of LPCS were studied in detail by FT-IR and TG-DSC; a compact ceramic was obtained when LPCS was firstly cured at 120 °C before pyrolysis. It was found that the LPCS-Cf/SiC composites possessed a higher density (2.13 g/cm3) than that of the PCS-Cf/SiC composites even though the PIP cycle for densification was obviously reduced, which means a higher densification efficiency. Logically, the LPCS-Cf/SiC composites exhibited superior mechanical properties. The shorter length and rougher surfaces of pulled-out fibers indicated the LPCS-Cf/SiC composites to possess a stronger bonding between matrix and PyC interphase compared with the PCS-Cf/SiC composites. © 2017 Elsevier Ltd and Techna Group S.r.l.


Fan H.-Q.,Shanghai University of Engineering Science | Xia D.-H.,Tianjin University | Li M.-C.,Shanghai University of Engineering Science | Li Q.,Shanghai University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2017

Self-assembled monolayers (SAMs) of 3-mercaptopropyltrimethoxysilane (PropS-SH) modified with La2O3 nanoparticles were investigated to evaluate the doping effect of La2O3 nanoparticles on PropS-SH silane film towards brass corrosion protection in NaCl solution. The results indicated that SAMs of PropS-SH modified with La2O3 nanoparticles presented improved barrier properties because La2O3 nanoparticles filled the holes of silane film, which in turn improved the density of silane film, thus enhanced the barrier properties of silane-metal interface. Further, part of La2O3 nanoparticles was transformed to lanthanum oxide hydroxide (LaOOH) by hydrolysis reaction, and the formed La compounds covered the cathode sites, giving rise to a blocking effect. © 2017 Elsevier B.V.


Li Q.,Shanghai University of Engineering Science | Li Q.,Shanghai University | Li Q.,Shanghai Institute of Materials Genome | Luo Q.,Shanghai University of Engineering Science | Gu Q.-F.,Australian Synchrotron
Journal of Materials Chemistry A | Year: 2017

In order to provide an efficient tool to explore alloy composition and processing conditions for Mg-based alloys with good hydriding/dehydriding (H/D) properties, investigation of the Mg-Ni-Nd-H quaternary system was carried out by experimental measurements and CALPHAD thermodynamic analysis combined with first-principles calculations. A new stable compound Nd16Mg96Ni12 with the space group of Cmc21 was identified in the Mg-Ni-Nd system by synchrotron powder X-ray diffraction (SR-PXRD). The phase equilibria and phase transformation related to Nd4Mg80Ni8, Nd16Mg96Ni12, NdMg5Ni and NdMg2Ni were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The formation enthalpies of these ternary compounds were calculated by the density functional theory. The existence of the quaternary hydrides NdMgNi4H4 and NdMg2Ni9H12 was taken into consideration. Based on the obtained thermodynamic description of the Mg-Ni-Nd-H system, the hydrogen storage capacities and pressure-composition-temperature (P-C-T) curves were predicted and two new ternary compounds Nd4Mg80Ni8 and Nd16Mg96Ni12 were designed as hydrogen storage alloys with excellent properties. Meanwhile, the H/D mechanism of the Mg-Ni-Nd alloy was revealed. © The Royal Society of Chemistry.


Shi L.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Shi L.,University of Chinese Academy of Sciences | Huang X.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Gu M.,CAS Hefei Key Laboratory of Materials for Energy Conversion | And 2 more authors.
Surface and Coatings Technology | Year: 2016

Ni/Ti/SKD/Ni (SKD: skutterudite) thermoelements were fabricated by spark plasma sintering and electroplating procedures. The interfacial stability was evaluated by long-term isothermal aging and multi-round thermal shock tests. The interfacial diffusion at Ni/SKD and Ni/Ti in the thermoelements during high temperature aging up to 15days was systematically studied by scanning electron microscopy with elemental distribution. The growth kinetics of the intermetallic compounds was analyzed, and the coefficients of the intermetallic compound growth rate were calculated. For the Ni/SKD interface, there was no inter-diffusion at temperatures below 200°C. However, three intermetallic compound layers for the Ti/Ni interface were confirmed to be TiNi3, TiNi and Ti2Ni sequentially from the Ni side to the Ti side at temperatures above 500°C, leading to an interfacial structure of Ti/Ti2Ni/TiNi/TiNi3/Ni. All interfaces maintained good bonding strength after long-term isothermal aging and multi-round thermal shock tests. The experimental data demonstrated that Ni is an ideal candidate as the electrode of skutterudite thermoelements at both the hot and cold sides. © 2015 Elsevier B.V.


Liu R.,CAS Shanghai Institute of Ceramics | Qin Y.,CAS Shanghai Institute of Ceramics | Cheng N.,CAS Shanghai Institute of Ceramics | Zhang J.,CAS Shanghai Institute of Ceramics | And 4 more authors.
Inorganic Chemistry Frontiers | Year: 2016

Multiple degenerate band engineering has been established as an effective approach to maximize electrical transport in thermoelectric materials. A series of polycrystalline samples of chalcopyrite Cu1-x-δAgxInTe2 (x = 0-0.5, δ = 0.02-0.05) was synthesized, to achieve multiple degenerate bands. A pseudocubic structure is realized when x is around 0.2. As a result, the degenerate valence bands influence electrical transport significantly. In addition, the lattice thermal conductivity is significantly depressed in the solid solution due to the strong phonon scattering by strain-field fluctuations, since Ag substitution brings significant anharmonicity to the crystal structure. The highest ZT of 1.24 was obtained at the composition Cu0.75Ag0.2InTe2. This study provides an example how the pseudocubic crystal structure is applied to design and evaluate the TE properties in diamond-like compounds. Introduction to the international collaboration Scientific collaboration between the Shanghai Institute of Ceramics and the Institutes of the Max-Planck Society has a long history. In 2001, the Max-Planck Institute for Chemical Physics of Solids in Dresden and SIC CAS in Shanghai established research cooperation. At the beginning it was focused on the field of solid state chemistry, and later was extended to the studies on thermoelectric materials. Currently this cooperation is intensively realized by the research groups of Prof. Lidong Chen in Shanghai and Prof. Yuri Grin in Dresden. Several publications in journals like Inorganic Chemistry, Dalton Transactions and Chemistry of Materials, as well as numerous presentations in the national and international conferences present the results of the common studies. © 2016 the Partner Organisations.


Li P.,Guangxi Normal University | Li P.,CAS Shanghai Institute of Ceramics | Ma R.,CAS Shanghai Institute of Ceramics | Ma R.,Shanghai Institute of Materials Genome | And 13 more authors.
RSC Advances | Year: 2015

The production of efficient and low-cost electrocatalysts for the oxygen reduction reaction (ORR) is one of the key issues for the extensive commercialization of fuel cells. In this paper, we describe a facile one-pot hydrothermal synthesis route to in situ grow spinel NiFe2O4 nanoparticles onto the graphene nanosheets which were produced in advance by a scalable solvothermal reduction of chloromethane and metallic potassium. The resultant NiFe2O4/graphene nanohybrid exhibits superior electrocatalytic activity for the ORR to pure graphene nanosheets and unsupported NiFe2O4 nanoparticles, which mainly favours a desirable direct 4e- reaction pathway during the ORR process. Meanwhile, the NiFe2O4/graphene nanohybrid exhibits the outstanding long-term stability for the ORR, outperforming the commercial 20 wt% Pt/C based on the current-time chronoamperometric test. The excellent catalytic activity and stability of NiFe2O4/graphene nanohybrid are ascribed to the strong coupling and synergistic effect between NiFe2O4 nanoparticles and graphene nanosheets. © The Royal Society of Chemistry 2015.


Wang J.,CAS Shanghai Institute of Ceramics | Wang J.,Shanghai Institute of Materials Genome | Ma R.,CAS Shanghai Institute of Ceramics | Ma R.,Shanghai Institute of Materials Genome | And 4 more authors.
Journal of Materials Chemistry A | Year: 2015

A series of novel nitrogen-doped hierarchical carbon monoliths (NCMs) with macroporous scaffolds composed of interconnected mesoporous rods were prepared successfully by a facile nanocasting strategy in combination with pyrolysis in a NH3 atmosphere. After etching off the hard template, the resulting NCMs had large macroporosity (up to 37.4 mL g-1) as well as large specific surface areas (1100-1600 m2 g-1), mesopore volumes (1.4-1.9 mL g-1), and narrow mesopore size distributions (3.8 nm). The nitrogen contents of the NCMs decreased from 4.7 to 1.6 at% with increasing pyrolysis temperature from 650 to 1050 °C. The pyridinic and graphitic nitrogen groups are dominant among various nitrogen-containing groups in the NCMs. Combined with their relatively high nitrogen-doping and unique hierarchical porous textures, NCM-750 exhibited comparable catalytic activity but superior long-term durability and methanol tolerance to commercial Pt/C for oxygen reduction reaction (ORR) with a four-electron transfer pathway in alkaline media. These excellent properties in combination with good recyclability and stability make these NCMs among the most promising electrocatalysts reported so far for efficient ORR in practical applications. © The Royal Society of Chemistry 2015.


Wang L.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Wang L.,University of Chinese Academy of Sciences | Yao Q.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Bi H.,CAS Hefei Key Laboratory of Materials for Energy Conversion | And 4 more authors.
Journal of Materials Chemistry A | Year: 2015

Polyaniline (PANI)/graphene (GP) thermoelectric (TE) composite films were prepared by a combination of in situ polymerization and a solution process. It was found that there existed a large number of graphene-polyaniline nano-interfaces in the composite films with graphene nanoplates aligned in the PANI matrix in the direction parallel to the substrate. SEM, TEM, Raman, XPS and UV-Vis analyses indicated that polyaniline coated on the surface of graphene by the strong π-π conjugation interactions during in situ polymerization, and then the PANI molecular chains were expanded by the chemical interactions between polyaniline and solution. Both the in situ polymerization process and solution process contributed to the uniform dispersion of graphene in the PANI matrix, which not only increased the number of graphene-polyaniline nano-interfaces in the composite, but also strengthened the π-π conjugation interactions between graphene and polyaniline, resulting in more ordered regions forming in the composite films. Consequently, the Seebeck coefficient of the composite films was remarkably improved and higher than the values calculated based on the series-connected two-component mixture model. The optimal electrical conductivity and Seebeck coefficient of the composite with 48 wt% graphene reached 814 S cm-1 and 26 μV K-1, respectively, resulting in a maximum power factor of 55 μW m-1 K-2, which is the highest value among the reported polymer/graphene composite TE materials. This journal is © The Royal Society of Chemistry 2015.


Wang L.,CAS Shanghai Institute of Ceramics | Wang L.,University of Chinese Academy of Sciences | Yao Q.,CAS Shanghai Institute of Ceramics | Qu S.,CAS Shanghai Institute of Ceramics | And 4 more authors.
Organic Electronics: physics, materials, applications | Year: 2016

Single-walled carbon nanotubes (SWNTs) have emerged as one of the leading additives for improving the thermoelectric properties of organic materials due to their unique structure and excellent electronic transport properties. However, since as-grown SWNTs possess different chirality, it is of high interest to determine the influence of electronic type of SWNTs on the thermoelectric properties of SWNTs/PANI composite films. Herein, we utilized metallic SWNTs (SWNT-M) and semiconducting SWNTs (SWNT-S) to prepare SWNTs/PANI composite films and studied their thermoelectric properties, respectively. Experimentally, the maximum thermoelectric power factor reached 51 μW m−1 K−2 for the 19 wt% SWNT-S/PANI composite films, while that value was only 16 μW m−1 K−2 for the 19 wt% SWNT-M/PANI composite films. The better power factor of SWNT-S/PANI composite films may be attributed to the more significantly enhanced Seebeck coefficient resulting from the effective energy filtering effect at the interfaces between SWNT-S and PANI. Our results reveal the influence of electronic type of SWNTs on the thermoelectric properties of composites, which will drive ongoing efforts to utilize SWNTs as fillers in nanocomposites for optimal thermoelectric properties. © 2016


Zong P.-A.,CAS Shanghai Institute of Ceramics | Zong P.-A.,University of Chinese Academy of Sciences | Chen X.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Zhu Y.,Hefei University of Technology | And 4 more authors.
Journal of Materials Chemistry A | Year: 2015

Nanostructures and nano-composites have been shown to be effective in depressing the lattice thermal conductivity and improving the performance of thermoelectric materials. However, ZT enhancement by nano-particle dispersion is limited only to a restricted level due to the difficulty in increasing the particle contents while maintaining a uniform and narrow size distribution. In the present work, YbyCo4Sb12-based nano-composites with reduced graphene oxide (rGO) layers of several nanometers intercalated on the grain boundary matrix forming a 3D network have been prepared through a simple in situ reduction approach using graphene oxide (GO) as the precursor. The 3D-rGO network wrapping architecture dramatically reduced the lattice thermal conductivity due to enhanced interparticle and intraparticle phonon scattering effects, and simultaneously enhanced the Seebeck coefficient due to the energy filtering effect of the grain boundary semiconductive rGO layer with nanometer thickness. The maximum ZT value of 1.51 was achieved for the Yb0.27Co4Sb12/rGO (0.72 vol%) composite at 850 K, outperforming all single-filled skutterudites and their nanocomposites ever reported. © 2015 The Royal Society of Chemistry.

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