Shen Yonglong

Zhengzhou University | zzu · School of Material Science and Engineering

As one of particular 2D transition metal dichalcogenide materials, the outstanding properties of MoS2 enable the promising formation of superior homo or heterojunction solar cells. However, in the process of introducing oxygen treatment to modify the interface defects of MoS2/Si solar cells, or modulate the Fermi level of MoS2 films, a thin layer o...

The photovoltaic performances of n-i-p or inverted p-i-n BaSi 2 homojunction solar cells are limited by the parasitic high light absorption of n-BaSi 2 or p-BaSi 2 window layer. In this work, diverse electron transport materials (ETMs) and hole transport materials (HTMs) are employed instead of BaSi 2 as window layers to promote the performances of...

Exfoliation of bulk molybdenum disulfide (MoS2) into few-layered nanosheets is achieved with the assistance of zero-valent transition metal (Co0, Ni0, Cu0) intercalation. The as-prepared MoS2 nanosheets are characterized to consist of 1T- and 2H-phases with an enhanced electrocatalytic hydrogen evolution reaction (HER) activity. This work provides...

Sodium‐carbon dioxide (Na‐CO 2 ) batteries are regarded as promising energy storage technologies because of their impressive theoretical energy density and CO 2 reutilization, but their practical applications are restricted by uncontrollable sodium dendrite growth and poor electrochemical kinetics of CO 2 cathode. Constructing suitable multifunctio...

The main bottleneck against industrial utilization of sodium‐ion batteries (SIBs) is the lack of high‐capacity electrodes to rival those of the benchmark lithium‐ion batteries (LIBs). Here in this work, we have developed an economical method for in situ fabrication of nanocomposites made of crystalline few‐layer graphene sheets loaded with ultrafin...

While sulphide solid electrolytes such as Na11Sn2PS12 can allow fast transport of Na+ ions, their utilization in solid sodium ion batteries is rather unsuccessful since they are not electrochemically compatible to both high‐voltage cathodes and sodium metal anode. In this work, we devise an effective approach towards realizing solid sodium ion batt...

It is of great importance to develop high‐capacity electrodes for sodium‐ion batteries (SIBs) using low‐cost and abundant materials, so as to deliver a sustainable technology as alternative to the established lithium‐ion batteries (LIBs). Here, a facile ball milling process to fabricate high‐capacity SIB anode is devised, with large amount of amorp...

There is growing production for lithium‐ion batteries (LIBs) to satisfy the booming development renewable energy storage systems. Meanwhile, amounts of spent LIBs have been generated and will become more soon. Therefore, the proper disposal of these spent LIBs is of significant importance. Graphite is the dominant anode in most commercial LIBs. Thi...

Alkali metal–CO2 batteries, which combine CO2 recycling with energy conversion and storage, are a promising way to address the energy crisis and global warming. Unfortunately, the limited cycle life, poor reversibility, and low energy efficiency of these batteries have hindered their commercialization. Li–CO2 battery systems have been intensively r...

While caesium lead bromide (CsPbBr 3) is promising for highly stable perovskite solar cells (PSCs), the usual solution-based methods require tedious multistep spin coating processes, which imposes a practical barrier against scaling up to large areas for industrial exploitation. Although sequential vapour deposition (SVD) can meet commercial requir...

Lead‐free Cs2AgBiBr6 double perovskite has received widespread attention because of its non‐toxicity and high thermal stability. However, intrinsic bromide ion (Br–) migration limits continuous operation of Cs2AgBiBr6‐based perovskite solar cells (PSCs). Herein, an operational and simple strategy is carried out to improve the power conversion effic...

Rechargeablezinc–airbatteries(ZABs)haveattractedgreatinterestsfor emergingenergyapplications.Nevertheless,oneofthemajorbottleneckslies inthefabricationofbifunctionalcatalystswithhighelectrochemicalactivity, highstability,lowcost,andfreeofpreciousandraremetals.Herein,a high-performancemetal-freebifunctionalcatalystissynthesizedinasingle stepbyregula...

Perovskite solar cells (PSCs) have become a promising research direction in photovoltaic field, where the evolution of the transparent conductive oxides (TCOs) electrodes, a vital part of photovoltaic devices, has played a distinctive role in their development. To date, the indium tin oxide (ITO) and fluorine-doped tin oxide (FTO) have been widely...

Recent advances in heterojunction and interfacial engineering of perovskite solar cells (PSCs) have enabled great progress in developing highly efficient and stable devices. Nevertheless, the effect of halide choice on the formation mechanism, crystallography and photoelectric properties of the low-dimensional phase still requires further detailed...

Solution‐processed metal halide perovskites have the advantages of a tunable bandgap, excellent charge transport properties, and suitable exciton binding energy. They therefore emerge as promising semiconductors for efficient perovskite solar cells (PSCs) and bright perovskite light‐emitting diodes (PLEDs). In addition, these devices possess a simi...

Two-dimensional (2D) ferromagnetic semiconductors that combine ferromagnetic order with desirable physical attributes could find transformative applications in atomically-thin magneto-optical and magnetoelectric devices. The mainstream strategies of creating magnetic moments in 2D materials are introducing charge carriers. Here we introduce a CO2-i...

While argyrodite sulfides are getting more and more attraction as highly promising solid‐state electrolytes (SSEs) for solid batteries, they also suffer from the typical sulfide setbacks such as poor electrochemical compatibility with Li anode and high voltage cathodes and as well as serious sensitivity to humid air, which hinders their practical a...

The unprecedented advancement in power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) has rendered them a promising game‐changer in photovoltaics. However, unsatisfactory environmental stability and high manufacturing cost of window electrodes are bottlenecks impeding their commercialization. Here, a strategy is introduced to addre...

2D heterostructures offer a great opportunity in seeking high-performing energy storage materials; however, performance ceiling exists, limited by their van-der-Waals (vdW) interactions. Here, we explore a novel 2D, amorphous MoO3-x (aMoO3-x) on Ti3C2-MXene, non-vdW heterostructure via a facile synthesis route. Density functional theory computation...

All‐inorganic CsPbBr3 based perovskite solar cells (PSCs) have attracted great attention because of their high chemical and thermal stabilities in ambient air. However, the short‐circuit current density (Jsc) of CsPbBr3 based PSCs is inadequate under solar illumination because of the wide bandgap, inefficient charge extraction and recombination los...

Heteroatom doped graphene materials are considered as promising anode for high performance Sodium‐ion batteries (SIBs). Defective and porous structure especially with large specific surface area is generally considered as a feasible strategy to boost reaction kinetics, however, the unwanted side reaction at the anode hinder the practical applicatio...

Understanding the fundamental properties of buried interfaces in perovskite photovoltaics is of paramount importance to the enhancement of device efficiency and stability. Nevertheless, accessing buried interfaces poses a sizeable challenge because of their non‐exposed feature. Herein, the mystery of the buried interface in full device stacks is de...

Objective: Motor imagery (MI) electroencephalography (EEG) classification is regarded as a promising technology for brain--computer interface (BCI) systems, which help people to communicate with the outside world using neural activities. However, decoding human intent accurately is a challenging task because of its small signal-to-noise ratio and...

Motor imagery (MI) electroencephalography (EEG) classification is an important part of the brain-computer interface (BCI), allowing people with mobility problems to communicate with the outside world via assistive devices. However, EEG decoding is a challenging task because of its complexity, dynamic nature, and low signal-to-noise ratio. Designing...

The scalability processing of all functional layers in perovskite solar cells (PSCs) is one of the critical challenges in the commercialization of perovskite photovoltaic technology. In response to this issue, a large-area and high-quality gallium-doped tin oxide (Ga-SnO x ) thin film is deposited by direct current magnetron sputtering and applied...

Efficient solar‐driven photocatalysts for hydrogen (H2) evolution have attracted significant attention in addressing serious energy security concerns. However, the photocatalytic activity for H2 evolution is usually hindered by rapid charge recombination and nonideal trapping during the water splitting process. Herein, hierarchical three‐dimensiona...

Nitrogen-doped vertical graphene (NVG) nanosheets have attracted enormous attention as promising metal-free electrochemical catalysts for the oxygen reduction reaction (ORR). However, the conventional synthesis of NVG nanosheets by plasma enhanced chemical vapor deposition (PECVD) suffers from high costs caused by high temperature and a complex pro...

X-ray detectors currently employed in dosimetry suffer from a number of drawbacks including the inability to conform to curved surfaces and being limited to smaller dimensions due to available crystal sizes. In this study, a hybrid X-ray detector (HXD) has been developed which offers real-time response with added advantages of being highly sensitiv...

Vertically aligned carbon nanotubes (VACNTs) present an exciting avenue for nanoelectronics due to their predetermined orientation and exceptional transport capabilities along the tube length, with the potential to be employed in a variety of optoelectronic applications. However, growth of VACNTs using conventional chemical vapor deposition (CVD) m...

N-doped graphene (NGr) incorporated with 2H-MoS2 and 1T-MoS2 (NGr/2H(1T)-MoS2) composites have been explored as anode materials for Li/K-ions batteries (LIBs/PIBs), however, the electrochemical mechanisms of their performance have not been well probed. In this work, we use first-principles calculations to investigate the atomic mechanisms associate...

In article number 2000854, Yonglong Shen, Guosheng Shao, and co‐workers propose a large‐area deposition of structurally tuned vertically standing graphene (VSG) using a scalable high‐flux plasma enhanced chemical vapor deposition (HPECVD) system. The generated energetic electrons in high‐flux plasma boost the reaction kinetics of the growth process...

Vertically standing graphene (VSG) films have demonstrated various appealing functionalities on the basis of excellent electrical/thermal conductivity and electrochemical/catalytic properties, owing to their unique morphology, preferable orientation of the basal planes, and adequate defects as effective catalytic sites. Most fabrication processes f...

Polar oxides (POs) with array structures are widely utilized to enhance the performance of sulfur cathode. However, the array structures with extensive open spaces are not able to trap as much lithium polysulfide species (LPSs) as closed structures, thus seriously limiting their sulfur loading capacities. Consequently, it is highly desirable to ide...

Layer-structured transition-metal disulfides are considered as promising anode materials for sodium ion batteries (SIBs). However, large volume change over charge-discharge cycles is behind a major problem for mechanical failure, leading to low capacity, poor rate and cycling performance. In this work, we devise a one-step solvothermal method to co...

All-solid-state batteries (ASSB) with lithium anode have attracted ever-increasing attention towards developing safer batteries with high energy densities. While great advancement has been achieved in developing solid electrolytes (SE) with superb ionic conductivity rivalling that of the current liquid technology, it has yet been very difficult in...

A heterostructure of crystallized MoO2/amorphous MoO3-x was constructed via reduction of crystalline MoO3 by Mo metal via a hydrothermal method. The heterostructure possesses an excellent photothermal conversion performance (61.5%). Abstract The heterostructure of crystallized MoO2/amorphous MoO3-x was firstly constructed via reduction of crystall...

Polymeric carbon nitrides (PCN) are promising photocatalysts and electrocatalysts for water oxidation, as they are environmentally benign materials with an adjustable structure and facilely synthesized from inexpensive and abundant starting materials. In this minireview, we examine the state-of-the-art strategies in tailoring PCN for efficient phot...

The one-step hydroalkylation of benzene to cyclohexylbenzene (CHB) was usually performed on the bifunctional metal/zeolite catalysts, and the tuning of acid/metal site balance by introducing more acid sites to metal sites in the catalysts is of great significance. Most of the current studies didn’t find effective approaches to improve the acid/meta...

Electrode materials with rationally designed architecture are crucial to achieve high-performance supercapacitors. However, there is still a great challenge for integrating the features of large accessible surface areas, fast electron/ion transport kinetics and favorable mechanical flexibility within a single electrode. Herein, we propose a facile...

Great efforts have been devoted to delafossite CuFeO2 for exploring its potential application in solar energy conversion. In this study, the structural, band gap, photoelectrochemical properties of pure and Ni doped delafossite CuFeO2 powders synthesized by hydrothermal method were investigated. XRD patterns confirm the formation of a majority of 3...

Two‐dimensional amorphous semiconductor (2DAS) monolayers can be regarded as a new phase of 2D monolayers materials and will serve as a promising field for the various electronic and optoelectronic applications. Here, together with the first‐principles calculations within density functional theory, we experimentally demonstrate that the 2DAS MoO3‐x...

Solid electrolytes based on theoretically identified double anti-perovskite phases Li6OSI2 were successfully synthesized. Experimental characterization supported theoretical prediction that S substitution of O leads to stabilization of the double anti-perovskite structure and lattice softening to significantly enhance ionic conductivity, so that th...

Monolayer MoTe2, with the narrowest direct bandgap of ≈1.1 eV among Mo‐ and W‐based transition metal dichalcogenides, has attracted increasing attention as a promising candidate for applications in novel near‐infrared electronics and optoelectronics. Realizing 2D lateral growth is an essential prerequisite for uniform thickness and property control...

Molybdenum sulfide (MoS 2 ) has attracted great interest as a promising non-precious-metal catalyst candidate to replace the precious-metal Pt catalysts for the hydrogen evolution reaction (HER). Nevertheless, the catalytic efficiency of MoS 2 is significantly restricted by its density of catalytic active sites and inert basal plane. In this work,...

High light absorption material BaSi2 based heterojunction and homojunctin solar cells were simulated with the program AMPS (analysis of microelectronic and photonic structures)-1D in order to thoroughly understand the mechanism for further improvement in conversion efficiency. Simulation results demonstrated that p⁺-Si/n-BaSi2 heterojunction solar...

Delafossite CuFeO2-x thin films were fabricated on quartz substrate using radio-frequency sputtering deposition under low O2 flow ratios from 9% to 0% at room temperature. The as-deposited films were in amorphous phase and crystallized into rhombohedral 3R (R3m) delafossite structure after post annealing at 900°C for 2 h in flowing N2 atmosphere. S...

Solid electrolyte with superb Li+ conductivity is key to enable safe and high-performance all-solid lithium ion batteries free of safety issues associated with flammable organic liquid electrolyte. Systematic experimental work has been carried out to follow up our recent theoretical prediction that superb ionic conductivity could be achieved throug...

n-MoS2/p-Si heterojunction solar cells were simulated by using Analysis of Microelectronic and Photonic Structures (AMPS-1D) software. In order to fundamentally understand the mechanism of such kind of cells, the effects of electron affinity, band gap and thickness for MoS2, as well as the donor concentration in Si layer on the devices performance...

The effects of electron and hole transport layer with the electrode work function on perovskite solar cells with the interface defects were simulated by using analysis of microelectronic and photonic structures-one-dimensional (AMPS-1D) software. The simulation results suggest that TiO2 electron transport layer provides best device performance with...

CuO thin films with different levels of compositional deviation from the 50:50 stoichiometry have been fabricated using radio-frequency (RF) sputtering deposition wherein the sputtering gases consisted of varied fractions of oxygen and argon. The microstructures of the thin films were characterised by combining a series of advanced methods includin...