Shun Shi

Bio: Shun Shi is an academic researcher from Sichuan University. The author has contributed to research in topics: Materials science & Spintronics. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.

Lithiophilic Interphase Porous Buffer Layer toward Uniform Nucleation in Lithium Metal Anodes

Abstract: Lithium metal batteries are highly desired for durable and high‐power energy storage devices due to high theoretical capacity and lowest redox potential. Nevertheless, high activity of Li, large volume change, and Li dendrite formation during cycling severely hinder their further application. Herein, an inventive Cu collector decorated with holey MoO2‐Mo3N2 heterojunction nanobelts‐coated reductive graphene oxide (G‐MoO2‐Mo3N2, GMM) for high‐performance Li metal batteries is reported. The collector features synergistic functions of remarkable lithiophilicity, a built‐in electric field formed by splendid interfacial contact, and dense lithiophilic‐enriched solid electrolyte interphase layer. They facilitate robust charge transfer and ionic diffusion, and meliorate inhomogenous Li‐ion flux for inhibiting the growth of dendrites. In addition, the incorporation of flexible graphene layer enhances the structural integrity and electron transport kinetics. Remarkably, it is demonstrated that GMM significantly enhances Coulombic efficiency of ≈99.5% over 1566 cycles (0.5 mA cm−2/0.5 mAh cm−2). Furthermore, excellent cycling and rate capability of full cells with the GMM@Cu anode and high areal loading of LiFePO4 cathode (22.2 mg cm−2) are also realized. This work illustrates the superiority of synergetic design of lithiophilic sites plus electron transport kinetics for the current collector of Li‐metal anode to seek the high energy density.

Broadband and high-performance SnS2/FePS3/graphene van der Waals heterojunction photodetector

Abstract: Two-dimensional materials and their heterojunctions have received extensive attention in fundamental and applied research of photonics, electronics, and spintronics. Herein, we stacked SnS2, FePS3, and graphene (Gr) nanosheets into SnS2/FePS3/Gr van der Waals heterojunction, which exhibits broadband photoresponse from an ultraviolet region (405 nm) to an infrared region (850 nm) in atmosphere at room temperature. It was found that the dominated carrier of SnS2/FePS3 and SnS2/FePS3/Gr hererojunction was different in the electrical transport. The photoresponsivity of SnS2/FePS3/Gr heterojunction was about two orders of magnitude higher than that of SnS2 and FePS3 and SnS2/FePS3 heterojunction. The response time of SnS2/FePS3/Gr heterojunction was slightly shorter than that of SnS2/FePS3 heterojunction and two orders of magnitude shorter than that of SnS2 and FePS3 under the 450 nm laser. The high responsivity and short response time of SnS2/FePS3/Gr heterojunction should be attributed to the type II band alignment and short channel distance in the vertical direction where electrons and holes can be separated and transit fast. Our result offered an opportunity for realization of the high-performance and broadband photodetector.

Size Regulation of Polydopamine Nanoparticles by Boronic Acid and Lewis Base.

Abstract: Size regulation of polydopamine nanoparticles (PDA NPs) is vital to melanin-inspired materials. The general strategy usually focuses on tuning of the reaction parameters which could affect the dopamine (DA) monomer polymerization process, such as pH, temperature, monomer concentration, etc. The reaction between boronic acids and catechols to form boronic esters has been widely applied in many fields, but little attention has been paid in the size regulation of PDA NPs. Here, we speculated the fine size regulation of PDA NPs can be directly achieved by using boronic acids and Lewis base molecules. It was found that these issues could indeed significantly affect the stability of the boronic esters formed by boronic acids and DA, which may further inhibit the monomer polymerization kinetics and tune the particle size of the resulting PDA NPs. We also found that the several intrinsic properties of PDA NPs such as the free radical scavenging ability, UV spectral absorption, photothermal behaviour and structural color were all changed with the particle size. We believe that this work could provide new opportunities for fabricating melanin-inspired PDA NPs with well controlled size and properties. This article is protected by copyright. All rights reserved.

Recent advances in flexible and wearable sensors for monitoring chemical molecules

Abstract: In recent years, real-time health management has been received increasing attention, benefiting from the rapid development of flexible and wearable devices. Conventionally, flexible and wearable devices were used in collecting...