Science China Materials

http://link.springer.com/journal/40843

List of Papers (Total 357)

Recent advancements in metal organic framework based electrodes for supercapacitors

Metal organic frameworks (MOFs) are considered as very promising candidates to build electrodes for electrochemical energy storage devices such as lithium ion batteries, fuel cells and supercapacitors, due to their diverse structure, adjustable aperture, large specific surface area and abundant active sites. Supercapacitor has been widely investigated in the past decades. Of ...

Carbon skeleton doped with Co, N, S and P as efficient electrocatalyst for oxygen evolution reaction

A new strategy for the preparation of highly efficient catalyst used in oxygen evolution reaction (OER) in alkaline media was developed. A Co-containing carbonitride polymer network (CoCN) was selected as a structural-directing template and a hypercross-linked polymer containing S and P, which formed on CoCN skeleton in situ, was used as a cover. After calcination at 450°C for 2 h, ...

Self-healable wire-shaped supercapacitors with two twisted NiCo2O4 coated polyvinyl alcohol hydrogel fibers

Wire-shaped supercapacitors (SCs) possessing light-weight, good flexibility and weavability have caught much attention, but it is still a challenge to extend the lifespan of the devices with gradual aging due to the rough usage or external factors. Herein, we report a new stretchable and self-healable wire-shaped SC. In the typical process, two polyvinyl alcohol/potassium hydroxide ...

In vitro and in vivo cytocompatibility evaluation of biodegradable magnesium-based stents: a review

Biodegradable magnesium (Mg)-based vascular stents have been designed as temporary scaffolds to treat angiostenotic lesions for the maintenance of normal blood flow. Numerous studies have presented in vitro and in vivo tests for the evaluation of the safety and feasibility of Mg-based vascular stents and the related materials. Therein the cytocompatibility is a basic and important ...

Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

光学陶瓷是一种透明的特种陶瓷, 可兼备单晶的高稳定性和玻璃、 流体和其他非晶材料的大尺寸的优点, 是有潜力的激光增益介质. 因为对晶体尺寸和对称性有严格要求, 而且需要高温烧结过程, 只有少数无机非金属材料可用于制备光学陶瓷. 本文报道了一种由配位聚合物(或称金属——有机框架)组成的新型陶瓷. 通过简单地降低溶剂挥发速度, MAF-4(即SOD型二甲基咪唑锌, 也称ZIF-8)的纳米晶即可融合形成致密的陶瓷状块体, 甚至具有毫米级尺寸和高达84%可见光透过率. 该金属——有机光学陶瓷MOOC-1可以负载荧光染料sulforhodamine 640并保持其发光特性, 包括很高的量子产率63.6%和极低的放大自发辐射阈值31 μJ cm-2. 其他几种金属——有机框架的纳米晶也可以在类似条件下融合成陶瓷或光学陶瓷. 考虑到金属——有机框架的结构和功能多样性, ...

Graphene-templated synthesis of sandwich-like porous carbon nanosheets for efficient oxygen reduction reaction in both alkaline and acidic media

Developing low-cost, high-performance electrocatalysts for the oxygen reduction reaction (ORR) is crucial for implementation of fuel cells and metal-air batteries into practical applications. Graphene-based catalysts have been extensively investigated for ORR in alkaline electrolytes. However, their performance in acidic electrolytes still requires further improvement compared to ...

Science and technology in high-entropy alloys

As human improve their ability to fabricate materials, alloys have evolved from simple to complex compositions, accordingly improving functions and performances, promoting the advancements of human civilization. In recent years, high-entropy alloys (HEAs) have attracted tremendous attention in various fields. With multiple principal components, they inherently possess unique ...

Nano-structured red phosphorus/porous carbon as a superior anode for lithium and sodium-ion batteries

To enhance electrochemical performance of lithium or sodium-ion batteries (LIBs or NIBs), active materials are usually filled in porous conductive particles to produce anode composites. However, it is still challenging to achieve high performance anode composites with high specific capacity, excellent rate performance, high initial Coulombic efficiency (ICE) and long cycle life. ...

Spherical periodicity as structural homology of crystalline and amorphous states

It has been widely accepted that spherical periodicity generally dominates liquid and amorphous structure formation, where atoms tend to gather near spherically periodic shells according to Friedel oscillation. Here we revealed that the same order is just hidden in the atomic global packing modes of the crystalline phases relevant to bulk metallic glasses. Among the ...

Construct Fe2+ species and Au particles for significantly enhanced photoelectrochemical performance of α-Fe2O3 by ion implantation

Photoelectrochemical (PEC) water splitting is a promising approach to producing H2 and O2. Hematite (α-Fe2O3) is considered one of the most promising photoelectrodes for PEC water splitting, due to its good photochemical stability, non-toxicity, abundance in earth, and suitable bandgap (E g∼2.1 eV). However, the PEC water splitting efficiency of hematite is severely hampered by its ...

Performance improvement of organic phototransistors by using polystyrene microspheres

Organic phototransistors (OPTs) have been intensively studied in recent years due to the combined advantages of phototransistors and organic semiconductors (OSCs). However, the electrical performance of OPTs is largely limited by OSCs themselves, posing a challenge to further improve the performance of the devices. Preparing nano/micro-structures of OSCs is considered as an ...

An Ostwald ripening route towards Ni-rich layered cathode material with cobalt-rich surface for lithium ion battery

An Ostwald ripening-based route is proposed to prepare Ni-rich layered cathodes with Co-rich surface for lithium-ion batteries (LIBs). Commercially available Ni0.8Co0.1 Mn0.1(OH)2 and spray pyrolysis derived porous Co3O4 are used as mixed precursors. During the lithiation reaction process under high-temperature, the porous Co3O4 microspheres scatter primary particles and ...

Constructing CdS/Cd/doped TiO2 Z-scheme type visible light photocatalyst for H2 production

Constructing Z-scheme type photocatalyst is an efficient way to improve the charge separation efficiency and enhance the photocatalytic activity. In this report, the Cd:TiO2 nanoparticles are prepared via the sol-gel route and employed as a starting material. When it was reduced by NaBH4 at 300°C, the surface oxygen vacancies were produced and Cd2+ was reduced into metal Cd0 ...

Advancements in three-dimensional titanium alloy mesh scaffolds fabricated by electron beam melting for biomedical devices: mechanical and biological aspects

We elucidate here the process-structure-property relationships in three-dimensional (3D) implantable titanium alloy biomaterials processed by electron beam melting (EBM) that is based on the principle of additive manufacturing. The conventional methods for processing of biomedical devices including freeze casting and sintering are limited because of the difficulties in adaptation ...

Ni(OH)2 nanoflakes supported on 3D hierarchically nanoporous gold/Ni foam as superior electrodes for supercapacitors

The increasing demand for portable electronic devices and hybrid electric vehicles stimulates the development of supercapacitors as an advanced energy storage system. Here, we demonstrate a binder-free nickel hydroxide@nanoporous gold/Ni foam (Ni(OH)2@NPG/Ni foam) electrode for high-performance supercapacitors, which is prepared by a facile three-step fabrication route including ...

Atypical BiOCl/Bi2S3 hetero-structures exhibiting remarkable photo-catalyst response

We demonstrate the fabrication of BiOCl/Bi2S3 which is well defined at a large scale. The BiOCl/Bi2S3 heterostructures exhibit an enhanced photo-catalytic degradation of methyl orange (MO) compared to BiOCl and Bi2S3, attributed to the interface between Bi2S3 and BiOCl, which effectively separate the photo-induced electron-hole pairs and suppress their recombination.

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

Graphitized nanocarbon materials can be an ideal catalyst support for heterogeneous catalytic systems. Their unique physical and chemical properties, such as large surface area, high adsorption capacity, excellent thermal and mechanical stability, outstanding electronic properties, and tunable porosity, allow the anchoring and dispersion of the active metals. Therefore, currently ...

Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6AI-4V alloy

The superplastic forming of Ti alloy welds has great application prospects in producing integrated components. However, the nugget zone (NZ) of the Ti alloy welds, produced by fusion welding or conventional friction stir welding (FSW), consists of lamellar microstructure, which exhibits either low superplasticity or high superplastic temperautre and low strain rate. As a result, ...

Layered double hydroxides with larger interlayer distance for enhanced pseudocapacitance

The interlayer space of the layered materials is not always the electrochemical active area for contributing to the pseudocapacitive process. To our knowledge, few efforts have been devoted to investigating the effect of interlayer distance of layered double hydroxides (LDHs) on pseudocapacitors. Here, we obtained the CoAl—LDH with different interlayer distance via the reaction in ...

Electron transport layer driven to improve the open-circuit voltage of CH3NH3PbI3 planar perovskite solar cells

Suitable electron transport layers are essential for high performance planar perovskite heterojunction solar cells. Here, we use ZnO electron transport layer sputtered under oxygen-rich atmosphere at room temperature to decrease the hydroxide and then suppress decomposition of perovskite films. The perovskite films with improved crystallinity and morphology are achieved. Besides, ...

Composite structural modeling and tensile mechanical behavior of graphene reinforced metal matrix composites

Owing to its distinguished mechanical stiffness and strength, graphene has become an ideal reinforcing material in kinds of composite materials. In this work, the graphene (reduced graphene oxide) reinforced aluminum (Al) matrix composites were fabricated by flaky powder metallurgy. Tensile tests of pure Al matrix and graphene/Al composites with bioinspired layered structures are ...