Junwei Sha

Tianjin University | tju · School of Materials Science and Engineering

Constructing a 3D composite Li metal anode (LMA) along with the engineering of artificial solid electrolyte interphase (SEI) is a promising strategy for achieving dendrite-free Li deposition and high cycling stability. The nanostructure of artificial SEI is closely related to the performance of the LMA. Herein, the self-grown process and morphology...

The marked Mg segregation at grain boundaries (GBs) in nanocrystalline Al alloys usually contributes additional GB segregation strengthening. To gain a further understanding of this phenomenon, molecular dynamics simulations were conducted to reveal the Mg segregation behavior at Al Σ9 (221)[11¯0\documentclass[12pt]{minimal} \usepackage{amsmath} \u...

This work delivers an in-depth investigation about the effect of Zn segregation on the properties of Al GBs. The Zn segregation behavior at 11 representative GBs in Al and the resultant GB properties were systematically revealed in the atomic and electronic levels via first-principles calculations. It is found that Zn atom has a moderate driving fo...

Bimetallic doping is widely used to enhance the oxygen evolution reaction (OER) activity of layered transition metal oxyhydroxides. However, the synergistic enhancement effect of different doping elements on the intrinsic OER activity is still obscure. In this study, the FeNi-codoped cobalt oxyhydroxide (CoOOH) as OER electrocatalyst was prepared s...

As widely used protective materials, the application of Al foams is still limited by their low intrinsic mechanical properties caused by the brittleness of struts. The introduction of Mg is recently demonstrated effective to improve the mechanical performance of Al foams; however, the mechanism of Mg modification is still not clear. In this work, A...

High energy density lithium-oxygen battery (LOB) is currently regraded as a promising candidate for next-generation power system. However, the dendrite and instability issues of Li metal anode lead to its poor cyclic stability and low energy density. In this work, lithiophilic Al2O3 seeds induced rigid carbon nanotube arrays (CNTA)/three-dimensiona...

In this chapter, powder metallurgy templates methods and additive manufacturing procedures to synthesize three‐dimensional graphene and its composites will be introduced systematically. The influence factors affecting the structure, quality, and performance of the final three‐dimensional graphene will also be analyzed in detail. The application of...

The construction and application of traditional high-strength 7075 aluminum alloy (Al7075) through selective laser melting (SLM) are currently restricted by the serious hot cracking phenomenon. To address this critical issue, in this study, Si is employed to assist the SLM printing of high-strength Al7075. The laser energy density during SLM is opt...

Single-atom catalysts (SACs) have demonstrated catalytic efficacy toward lithium polysulfide conversion in Li-S batteries. However, achieving high-density M-Nx sites with rational design by a simple method is still challenging to date. Herein, an ultrathin porous 3D carbon-supported single-atom catalyst (SACo/NDC) is synthesized with a salt-templat...

Silicon (Si) has a significant influence on the cellular structure and microstructure of the Aluminum (Al) foams, which in turn will notably affect their mechanical responses. In the present work, the Al‐Si foams are fabricated via a novel powder metallurgy foaming approaches with multiple Si contents to investigate the role of Si concentrations on...

Organic molecules with various functional groups have been implemented to engineer the surface and grain boundary of perovskite, and improve the efficiency and stability of perovskite solar cells (PSCs). However, there is a lack of systematic comparison and comprehensive understanding about the intrinsic effect of various functional groups on the p...

Constructing sodium-ion battery anodes with efficient ion/electron transport and high cycling stability is significantly promising for applications but still remains challenging. Here, “three-in-one” multi-level design is performed to develop a carbon-coated phosphorous-doped MoS2 anchored on carbon nanotube paper (P-MoS2@C/CNTP). The Na⁺ diffusion...

The structural deterioration caused by the relatively weak out-of-plane bending stiffness and the chemically-active edge area of graphene limits its outperformance in strengthening for Al matrix composites (AMCs). Introducing one-dimensional (1D) carbon nanotubes (CNTs) to graphene/metal system is one of the promised strategies to complement the we...

Designing heterogeneous structures is a promising pathway for overcoming the trade-off between strength and toughness in metal matrix composites (MMCs). Herein, we report an innovative strategy for fabricating graphene nanosheet-Cu reinforced Al matrix (GNS-Cu/Al) composites with heterogeneous structure. This strategy involves the consolidation of...

To address the issues of “shuttle effect” of soluble polysulfides and sluggish redox kinetics in the cathodes of lithium-sulfur batteries, the acceleration of the polysulfides conversion via electrocatalysis is a promising solution. As a common electrocatalyst, the catalytic ability of two dimensional (2D) MoS2 is considerably diminished due to agg...

This study presents the results of quasi-static compressive tests of aluminum (Al) foam-filled tubes (A-FFTs) and Carbon Nanotubes (CNTs)/Al composite foam-filled tubes (C-FFTs) prepared by in-situ filling space-holder method. The effects of processing parameters and interface interaction between foam fillers and tubes on mechanical properties and...

In aprotic lithium-oxygen batteries (LOBs), it is hard to simultaneously achieve both high specific capacity and good reversibility with the insulating solid Li2O2 formed via traditional surface or solution route. Tuning the structure of Li2O2 to construct a large-area amorphous film on the surfaces of catalysts is expected to break the above perfo...

The interface doping with transition metal elements (TM = Ti, Cr, Co, Ni) has been experimentally proved to be an effective pathway to improve the weak interface bonding of graphene/copper (Gr/Cu) composites. In this paper, the microscopic influencing mechanism of TM doping on the interface interaction and mechanical properties of Gr/Cu was investi...

Three-dimensional bi-functional modular graphene network (3D bmG) is developed by using metal powder assisted soluble salt templates method. The 3D bmG contains two kinds of modules with different functions: the 3D graphene catalyzed by Ni powder (3D bmG-n) and the 3D graphene grown on NaCl crystals (3D bmG-s). The 3D bmG-n with high crystallizatio...

Achieving uniform reinforcement dispersion and strong interfacial bonding remains challenging to increase the strengthening efficiency in advanced metal matrix composites (MMCs). In this work, we report the prominent strengthening efficiency in graphene nanosheet reinforced Al matrix (GNS/Al) composites fabricated via hybrid deformation combining h...

In this work, few-layered MoS2 (FLM) nanosheet-reinforced Al matrix composites are developed through powder metallurgy and hot extrusion. The microstructure, mechanical properties, and strengthening mechanisms have been systematically investigated. It is found that Al12Mo and Al2S3 can be formed in-situ during the sintering process, resulting in th...

The integrity and regularity of pore morphology play an important role in determining the mechanical properties of the metallic foam materials. The conventional methods on refining pore morphology are mainly focused on the optimization of fabrication techniques, however, they are usually inconvenient and complicated. Recently, incorporating nano re...

W atoms/clusters are employed to in situ assist the development of layered vertically aligned carbon nanotube arrays (VACNTs) through hot-filament-assisted chemical vapor deposition (HFCVD) with liquid binary Fe3O4/AlO x catalysts. The hot W filament was utilized to in situ evaporate atomic W and form W clusters on Fe catalysts, which have a strong...

Metal oxide/carbon materials composites (MOx/C) are broadly used as electrodes in energy storage devices. However, their capacity under high rates is limited due to the sluggish ion/electron transportation during faradaic reactions. In this work, carbon nanotube carpets (CC)/Fe2O3 nanoparticles covered with bud-liked carbon layer (CC/Fe2O3@b-C) is...

It is of great significance for the development of hydrogen energy to explore efficient, stable, and resource-rich non-precious metal eletrocatalysts instead of precious metal eletrocatalysts for hydrogen evolution reaction (HER). In this work, we in-situ synthesized the MoS2/Co9S8 heterostructure by synthesizing MoS2@Co9S8 nanosheets on the carbon...

Low photothermal conversion efficiency restricts the antibacterial application of photothermal materials. In this work, two-dimensional carbon nanosheets (2D C) were prepared and decorated with Cu nanoparticles (2D C/Cu) by using a simple soluble salt template method combined with ultrasonic exfoliation. The photothermal conversion efficiency of 2D...

The preparation of electrode materials with high performance is of great significance to the practical application of supercapacitors. Here, O-doped NiCoP (ONiCoP) electrode material with porous nanoneedle structure was synthesized in-situ on carbon cloth by hydrothermal process and subsequent phosphorization treatment with high mass loading of 5.0...

Temperature changes caused by thermal effects greatly impact the performance of lithium-ion batteries. It is necessary to figure out the source of heat to assist battery thermal management, and to predict the battery temperature in order to warn the abnormal situation. Herein, this work demonstrate a series of data-driven approaches to analyze the...

Introduction of magnetism in large-area monolayer graphene has captured much attention in the graphene community, owing to the potential applications in transistors, magnetic memory, spintronic devices, and so on. Here, we use graphene nanoribbons (GNRs) as reinforcing rebar to in situ reinforce large-area graphene, where the edges of graphene nano...

Performance of a mechanical buffer can be significantly improved by strengthening the materials and optimizing its structure. Manufacturing of high-strength and light-weight foam-filled tubes (FFTs) has been proved to be an ingenious strategy. In this work, the in situ grown carbon nanotubes (CNTs) were used to reinforce aluminum (Al) foams. The FF...

The advanced Zn-ion hybrid supercapacitors (ZHSs) is an advanced energy storage system with high energy/power density. However, the development of cathode with high-performance is still in challenge. Herein, N, O co-doped hierarchical porous carbon (HPC) integrated with carbon cloth (CC) was fabricated as a promising cathode for aqueous ZHS, which...

ReS2 has been considered as an emerging transition metal dichalcogenides (TMDs) material for sodium-ion batteries (SIBs). However, its electrochemical performance is severely limited by the structural aggregation and damage during deep charge-discharge. Here, a new 1D TiO2@ReS2 core-shell structure is reported for boosting the stable performance as...

In this paper, two types of the foam-filled tubes (FFTs), including O-FFTs and T6-FFTs, were prepared by directly inserting Al foams (AFs) into 6061-O Al alloy empty tubes (O-ETs) and 6061-T6 Al alloy empty tubes (T6-ETs), respectively. Quasi-static compression tests of studied specimens were carried out using an environmental chamber under the tem...

NiFe materials have been favored for electrocatalysis because of their high activity and high stability in oxygen evolution reaction (OER). However, achieving high hydrogen evolution reaction (HER) properties remains challenging. Herein, NiFe layered double hydroxide (NiFe LDH) was prepared by one-step hydrothermal method. The N-modified NiFe LDH e...

Hydrogen evolution reaction (HER) activities of WS2 can be improved by doping exotic atom to increase active sites on base plane and narrow the bandgap. However, most of these catalysts of exotic atom doped WS2 are composed of semiconductor and the electronegativity between atoms is similar, which do harm to tuning bandgap with a wide range and dec...

The compression‐compression fatigue performance of carbon nanotube (CNT) reinforced aluminium matrix composite foams (AMCFs) were investigated. The ε‐N curves of AMCFs are composed of three stages (the elastic, strain hardening, and rapid accumulation stages), while the fatigue strain of AMCFs accumulates very rapidly in stage III compared with Al...

Developing efficient and low-cost electrocatalysts for hydrogen evolution reaction (HER) is important in clean energy systems. Non-noble transition metals are the most promising candidates for the replacement of conventional Pt group catalysts of HER. However, most non-noble metals show poor HER activity due to the intrinsic electronic structures....

A free-standing covalently bonded CNTs/graphene foam (LPM-3D rebar GF) is developed by using an in-situ loose powder metallurgy templates method for high-performance dendrite-free Li metal anodes. The LPM-3D rebar GF possesses a macroporous structure with interconnected porous pipelines. The homogeneously dispersed CNTs can induce an in-situ growth...

Three-dimensional interconnected carbon networks (3DCNs) materials have the advantages of large specific surface area, high porosity, and high electronic and ionic conductivity. Especially, 3DCNs can combine with other nanomaterials to achieve the synergistic effect in numerous applications, such as energy storage, catalysis, and structural enginee...

The electrode materials play a vital role in the electrochemical energy storage devices and many efforts have been devoted to explore the optimized high-performance electrode materials. 3D porous carbon materials and their composites have attracted significant attentions as the advanced electrode materials. In this review, we firstly summarize the...

A series of NiCo2P-based electrocatalysts, which were wrapped by CeO2 whose oxygen vacancies (VO) are partially filled with phosphorus atoms (named as NiCo2P x /P x FVo-CeO2, where x refers to the consumption of NaH2PO2·H2O), have been fabricated to improve the electrocatalytic reactivity of NiCo2P toward hydrogen evolution in alkaline solution. In...

The controllable design of composition and structure makes incorporating reinforcements to be a promising way to fabricate aluminum (Al) composite foams. In this work, graphene nanosheets (GNSs) decorated with copper (Cu) nanoparticles reinforced Al composite foams are successfully synthesized via shift-speed ball-milling and space-holder method. T...

The compression-compression fatigue properties of open-cell Al foams fabricated by space-holder method with different porosities were investigated. The ε–N curves of the Al foams show two types based on the stress levels (k). The first type shows a three-stages for low stress level (k < 0.9), while the second type only presents stage I and stage II...

Conductive epoxy composites are of great interest due to their applications in electronics. They are usually made by mixing powdered conductive fillers with epoxy. But the conductivity of the composite is limited by the low filler content because increasing filler content causes processing difficulties and reduces the mechanical properties of the e...

Traditional laminated metal matrix composites are confined to two-component system of pure metal matrix and its reinforcement. To achieve further improvement of the applied mechanical properties, in this work, the soft phase of laminated composites was enhanced by alloying with Cu. The synergistic effect of Cu on phases of both soft and hard includ...

Uniformly dispersed carbon nanotubes (CNTs) reinforced aluminum (Al) alloy matrix composite foams were successfully fabricated by the combination of in-situ chemical vapor deposition and powder metallurgy using titanium hydride as a blowing agent. The effects of CNTs on the pore structure were systematically studied. The results showed that compare...

Electrochemical reduction of CO2 provides an opportunity to reach a carbon‐neutral energy recycling regime, in which CO2 emissions from fuel use are collected and converted back to fuels. The reduction of CO2 to CO is the first step toward the synthesis of more complex carbon‐based fuels and chemicals. Therefore, understanding this step is crucial...

A hybrid of graphene nanoribbons (GNRs) interlacing hollow NiCoO2 (G-HNCO) nanocages in a size range of 300~500 nm with rough surface is synthesized by a chemical etching Cu2O templates and followed by GNR interlacing process. The G-HNCO showed high electrochemical performance of oxygen evolution reaction (OER), which exhibited small onset potentia...

The rapidly increasing serious energy crisis and environmental degradation are stimulating the rapid development of photocatalysis and rechargeable lithium/sodium ion batteries. In particular, the MoS2/TiO2 based nanocomposites have shown great potential and been widely studied in both areas of photocatalysis and rechargeable lithium/sodium ion bat...

A three-dimensional sponge of graphene nanoribbons crosslinked by Fe3O4 nanoparticles (NPs), which is denoted as 3D Fe3O4@GNRs, is synthesized in a simple reflux way. In this hybrid, GNRs with open and active edges are used as building blocks while Fe3O4 NPs are employed not only as anode materials but as a crosslink agent to weld GNRs at the joins...

Graphene nanosheets (GNS) have attracted lots of attention as an ideal reinforcement in Al matrix composites. However, there are still challenges limiting the performance of the composites, such as the homogenous distribution of GNS in Al matrices, the structural integrity of GNS after ball-milling, and the interfacial bonding between GNS and Al ma...

Electrically splitting water to H2 and O2 is a preferred method for energy storage as long as no CO2 is emitted during the supplied electrical input. Here we report a laser induced graphene (LIG) process to fabricate efficient catalytic electrodes on opposing faces of a plastic sheet, for the generation of both H2 and O2. The high porosity and elec...

Germanium is a promising anode for lithium ion batteries (LIB) because of its potential rate capability and high theoretical specific capacity. Here we demonstrate a seamlessly connected graphene and carbon nanotube (GCNT) hybrid that serves as an integral current collector for a Ge anode. A vertically aligned CNT (VA-CNT) forest grown on graphene...

The cathodic oxygen reduction reaction (ORR) is essential in the electrochemical energy conversion of fuel cells. Here, through the NH3 atmosphere annealing of a graphene oxide (GO) precursor containing trace amounts of Ru, we have synthesized atomically dispersed Ru on nitrogen-doped graphene that performs as an electrocatalyst for the ORR in acid...

An automated metal powder three-dimensional (3D) printing method for in situ synthesis of free-standing 3D graphene foams (GFs) was successfully modeled by manually placing a mixture of Ni and sucrose onto a platform, and then using a commercial CO2 laser to convert the Ni/sucrose mixture into 3D GFs. The sucrose acted as the solid carbon source fo...

The drive for significant advancement in battery capacity and energy density inspired a revisit to the use of Li metal anode. We report the use of a seamless graphene-carbon nanotube (GCNT) electrode to reversibly store Li metal with complete dendrite formation suppression. The GCNT-Li capacity of 3351 mAh g(-1)GCNT-Li approaches that of bare Li me...

Here we show that a versatile binary catalyst solution of Fe3O4/AlOx nanoparticles enables homogeneous growth of single to few-walled carbon nanotube (CNT) carpets from three-dimensional carbon-based substrates, moving past existing two-dimensional limited growth methods. The binary catalyst is composed of amorphous AlOx nanoclusters over Fe3O4 cry...

Free-standing robust three-dimensional (3D) rebar graphene foams (GFs) were developed by a powder metallurgy template method with multi-walled carbon nanotubes (MWCNTs) as a reinforcing bar, sintered Ni skeletons as a template and catalyst, and sucrose as a solid carbon source. As a reinforcement and bridge between different graphene sheets and car...

A three-dimensional (3D) interconnected graphene nanoribbons (GNRs) framework wrapping double nanoshells of SnO2@TiO2 was synthesized by a simple but effective method. The nanoshell of TiO2 anchored on the surface of SnO2 nanoshell with hollow core to restrict large volume expansion, then GNRs wrapped and interlaced double nanoshells of SnO2@TiO2 t...

Three-dimensional (3D) reduced graphene oxide (rGO) anchored carbon-coated Fe2O3 core-shell nanoparticles (Fe2O3@C-rGO) has been developed successfully through a simple one-pot hydrothermal process followed by a further annealing treatment. The 3D Fe2O3@C-rGO nanocomposite consists of carbon-coated Fe2O3 nanoparticle clusters (Fe2O3@C) and rGO nano...

Large-area graphene has emerged as a promising material for use in flexible and transparent electronics due to its flexibility and optical and electronic properties. The anchoring of transition metal nanoparticles on large-area single-layer graphene is still a challenge. Here we report an in situ preparation of carbon nano-onion-encapsulated Fe nan...

A high-quality micro-sized ultrathin single-crystalline anatase TiO2 nanosheets (MS-TiO2) with exposed {001} facets were synthesized by a facile and low-cost two-step process that combines a graphene oxide (GO)-assisted hydrothermal method with calcination. Both GO and HF play an important role in the formation of well dispersed MS-TiO2. As a novel...

A simple and scalable method which combines traditional powder metallurgy and chemical vapor deposition is developed for the synthesis of mesoporous free-standing 3D graphene foams. The powder metallurgy templates for 3D graphene foams (PMT-GFs) consists of particle-like carbon shells which are connected by multi-layered graphene that shows high sp...

A free-standing Fe3O4/rebar graphene (FRG) composite film was obtained through solvothermal method. The microstructure, phases, electrochemical performance of the composite used as anode in lithium ion battery have been characterized by SEM, TEM, XRD, Raman, FT-IR and electrochemical measurements. In rebar graphene (RG), the single-wall carbon nano...

{010}-Oriented flower-like Bi2WO6 with high adsorptivity and photoactivity was prepared via a hydrothermal method without any additives under neutral environment. The anisotropic flower-like Bi2WO6 shows greatly enhanced adsorptivity and photoactivity compared with isotropic particle Bi2WO6 as well as most of other forms of Bi2WO6. The superior ads...

The rare earth scandium (Sc) as a microalloying element has attracted an increasing interest in aluminum alloys for achieving excellent mechanical properties. Combining with zirconium, high strength and low price Al–Sc alloys are expected. The effects of Sc and Zr on the grain refinement, recrystallization resistance and precipitation hardening wer...

A chain-like carbon nanostructure, which we call as carbon nano-chains (CNCs), was synthesized through chemical vapor deposition (CVD). The influence of growth conditions (such as growth temperature, time and gas ratio) during CVD process on the carbon structures and the growth mechanism of the CNCs were investigated. To explore the potential appli...

A high-quality ultrathin anatase TiO2 nanosheet (ANT)/reduced graphene oxide (RGO) composite is successfully prepared by a simple one-step hydrothermal synthetic route. The unique 2-D integrative features and mesoporous characteristic of the ultrathin ATN/RGO composite with a large surface area and outstanding stability are very favorable for lithi...

Two kinds of TiO2 with novel structures, interpenetrating anatase TiO2 tablets (IP-TiO2), and overlapping anatase TiO2 nanosheets (OL-TiO2) with exposed {0 0 1} facets, are synthesized. The graphene oxide (GO) supported ultrathin TiO2 nanosheets (OL-TiO2/GO) is also prepared by one-pot hydrothermal method. The microscopic feature, morphology, phase...