ORCID Profile
0000-0002-1793-7380
Current Organisation
Tongji University
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Publisher: Wiley
Date: 25-04-2022
Abstract: Developing zero‐strain electrode materials with high capacity is crucial for lithium‐ion batteries (LIBs). Here, a new zero‐strain composite material made of ultrasmall Si nanodots (NDs) within metal organic framework‐derived nanoreactors (Si NDs⊂MDN) through a novel space‐confined catalytic strategy is reported. The unique Si NDs⊂MDN anode features a low strain ( %) and a high theoretical lithium storage capacity (1524 mAh g ‐1 ) which far surpasses the traditional single‐crystal counterparts that suffer from a low capacity delivery. The zero‐strain property is evidenced by substantial characterizations including ex/in situ transmission electron microscopy and mechanical simulations. The Si NDs⊂MDN exhibits superior cycling stability and high reversible capacity (1327 mAh g ‐1 at 0.1 A g ‐1 after 100 cycles) in half‐cells and high energy density (366 Wh kg ‐1 after 300 cycles) in a full cell. This study reports a new catalog of zero‐strain electrode material with significantly improved capacity beyond the traditional single‐crystal zero‐strain materials.
Publisher: Elsevier BV
Date: 05-2018
Publisher: Wiley
Date: 21-01-2020
Abstract: Incorporating nanoscale Si into a carbon matrix with high dispersity is desirable for the preparation of lithium-ion batteries (LIBs) but remains challenging. A space-confined catalytic strategy is proposed for direct superassembly of Si nanodots within a carbon (Si NDs⊂C) framework by copyrolysis of triphenyltin hydride (TPT) and diphenylsilane (DPS), where Sn atomic clusters created from TPT pyrolysis serve as the catalyst for DPS pyrolysis and Si catalytic growth. The use of Sn atomic cluster catalysts alters the reaction pathway to avoid SiC generation and enable formation of Si NDs with reduced dimensions. A typical Si NDs⊂C framework demonstrates a remarkable comprehensive performance comparable to other Si-based high-performance half LIBs, and higher energy densities compared to commercial full LIBs, as a consequence of the high dispersity of Si NDs with low lithiation stress. Supported by mechanic simulations, this study paves the way for construction of Si/C composites suitable for applications in future energy technologies.
Publisher: Springer Science and Business Media LLC
Date: 08-05-2017
Publisher: Wiley
Date: 10-03-2021
Publisher: Wiley
Date: 08-2018
Publisher: American Chemical Society (ACS)
Date: 11-11-2019
Publisher: American Chemical Society (ACS)
Date: 08-08-2016
Abstract: Semiconductor nanowires that have been extensively studied are typically in a crystalline phase. Much less studied are amorphous semiconductor nanowires due to the difficulty for their synthesis, despite a set of characteristics desirable for photoelectric devices, such as higher surface area, higher surface activity, and higher light harvesting. In this work of combined experiment and computation, taking Zn2GeO4 (ZGO) as an ex le, we propose a site-specific heteroatom substitution strategy through a solution-phase ions-alternative-deposition route to prepare amorphous/crystalline Si-incorporated ZGO nanowires with tunable band structures. The substitution of Si atoms for the Zn or Ge atoms distorts the bonding network to a different extent, leading to the formation of amorphous Zn1.7Si0.3GeO4 (ZSGO) or crystalline Zn2(GeO4)0.88(SiO4)0.12 (ZGSO) nanowires, respectively, with different bandgaps. The amorphous ZSGO nanowire arrays exhibit significantly enhanced performance in photoelectrochemical water splitting, such as higher and more stable photocurrent, and faster photoresponse and recovery, relative to crystalline ZGSO and ZGO nanowires in this work, as well as ZGO photocatalysts reported previously. The remarkable performance highlights the advantages of the ZSGO amorphous nanowires for photoelectric devices, such as higher light harvesting capability, faster charge separation, lower charge recombination, and higher surface catalytic activity.
Publisher: Wiley
Date: 02-07-2020
Publisher: American Chemical Society (ACS)
Date: 10-04-2015
Abstract: Noble metals are well-known for their surface plasmon resonance effect that enables strong light absorption typically in the visible regions for gold and silver. However, unlike semiconductors, noble metals are commonly considered incapable of catalyzing reactions via photogenerated electron-hole pairs due to their continuous energy band structures. So far, photonically activated catalytic system based on pure noble metal nanostructures has seldom been reported. Here, we report the development of three different novel plasmonic Au superstructures comprised of Au nanoparticles, multiple-twinned nanoparticles and nanoworms assembling on the surfaces of SiO2 nanospheres respectively via a well-designed synthetic strategy. It is found that these novel Au superstructures show enhanced broadband visible-light absorption due to the plasmon resonance coupling within the superstructures, and thus can effectively focus the energy of photon fluxes to generate much more excited hot electrons and holes for promoting catalytic reactions. Accordingly, these Au superstructures exhibit significantly visible-light-enhanced catalytic efficiency (up to ∼264% enhancement) for the commercial reaction of p-nitrophenol reduction.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02182K
Abstract: Novel strawberry-like Au nanostar-encrusted ZnO mesocrystals have been synthesized through a one-pot additive-free strategy with extraordinary sensing performance towards H 2 S.
Publisher: Wiley
Date: 21-06-2017
Abstract: The realization of antipulverization electrode structures, especially using low‐carbon‐content anode materials, is crucial for developing high‐energy and long‐life lithium‐ion batteries (LIBs) however, this technology remains challenging. This study shows that SnO 2 triple‐shelled hollow superstructures (TSHSs) with a low carbon content (4.83%) constructed by layer‐by‐layer assembly of various nanostructure units can withstand a huge volume expansion of ≈231.8% and deliver a high reversible capacity of 1099 mAh g −1 even after 1450 cycles. These values represent the best comprehensive performance in SnO 2 ‐based anodes to date. Mechanics simulations and in situ transmission electron microscopy suggest that the TSHSs enable a self‐synergistic structure‐preservation behavior upon lithiation/delithiation, protecting the superstructures from collapse and guaranteeing the electrode structural integrity during long‐term cycling. Specifically, the outer shells during lithiation processes are fully lithiated, preventing the overlithiation and the collapse of the inner shells in turn, in delithiation processes, the underlithiated inner shells work as robust cores to support the huge volume contraction of the outer shells meanwhile, the middle shells with abundant pores offer sufficient space to accommodate the volume change from the outer shell during both lithiation and delithiation. This study opens a new avenue in the development of high‐performance LIBs for practical energy applications.
Publisher: Wiley
Date: 31-07-2022
Abstract: Single‐atom catalysts (SACs) show high catalytic efficiency in accelerating conversion of lithium polysulfides (LiPS), and are thus promising for suppressing the shuttle effect observed in lithium−sulfur batteries (LSBs) however, single‐atom catalytic sites with low content of catalysts largely restrict their catalytic effect. Herein, a CoP cluster supported by a N‐doped carbon matrix (CoP cluster/NC) with atomic‐level dispersion and an ultrahigh content (25.5 wt.%) of Co atoms is fabricated via an in situ low‐temperature phosphorization strategy and employed as a dual‐atom‐site catalyst for catalyzing LiPS conversion. The CoP cluster/NC with abundant unsaturated CoP coordination provides dual‐atom sites of Co and P to dynamically adsorb/desorb sulfur species and Li + ions, respectively, synergistically promoting the conversion of LiPS. The dual‐atom‐site catalytic mechanism is evidenced by substantial characterizations including X‐ray absorption fine structure measurements and density functional theory calculations. Consequently, the S@CoP cluster/NC cathode shows superior cycling and rate performance. Even at a high sulfur loading of 6.2 mg cm −2 , a high areal capacity of 6.5 mAh cm −2 that surpasses most commercial lithium–ion batteries can be achieved. This study opens a new avenue in the development of advanced catalysts with new catalytic mechanisms for high‐performance LSBs.
Publisher: Elsevier BV
Date: 04-2018
Publisher: American Chemical Society (ACS)
Date: 09-04-2020
Publisher: Springer Science and Business Media LLC
Date: 26-03-2019
DOI: 10.1038/S41467-019-09384-7
Abstract: The intercalation strategy has become crucial for 2D layered materials to achieve desirable properties, however, the intercalated guests are often limited to metal ions or small molecules. Here, we develop a simple, mild and efficient polymer-direct-intercalation strategy that different polymers (polyethyleneimine and polyethylene glycol) can directly intercalate into the MoS 2 interlayers, forming MoS 2 -polymer composites and interlayer-expanded MoS 2 /carbon heteroaerogels after carbonization. The polymer-direct-intercalation behavior has been investigated by substantial characterizations and molecular dynamic calculations. The resulting composite heteroaerogels possess 3D conductive MoS 2 /C frameworks, expanded MoS 2 interlayers (0.98 nm), high MoS 2 contents (up to 74%) and high Mo valence (+6), beneficial to fast and stable charge transport and enhanced pseudocapacitive energy storage. Consequently, the typical MoS 2 /N-doped carbon heteroaerogels exhibit outstanding supercapacitor performance, such as ultrahigh capacitance, remarkable rate capability and excellent cycling stability. This study offers a new intercalation strategy which may be generally applicable to 2D materials for promising energy applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR08999F
Abstract: Interfacial bridge bonds (Ti–S–Co) have been found and proposed, which can strengthen the electrode–electrocatalyst integrity and boost the HER.
Publisher: American Chemical Society (ACS)
Date: 12-12-2016
DOI: 10.1021/JACS.6B10782
Abstract: High-power sodium-ion batteries (SIBs) with long-term cycling attract increasing attention for large-scale energy storage. However, traditional SIBs toward practical applications still suffer from low rate capability and poor cycle induced by pulverization and amorphorization of anodes at high rate (over 5 C) during the fast ion insertion/extraction process. The present work demonstrates a robust strategy for a variety of (Sb-C, Bi-C, Sn-C, Ge-C, Sb-Bi-C) freestanding metal-carbon framework thin films via a space-confined superassembly (SCSA) strategy. The sodium-ion battery employing the Sb-C framework exhibits an unprecedented performance with a high specific capacity of 246 mAh g
Location: Germany
No related grants have been discovered for Jinhu Yang.