Yi Yu

ShanghaiTech University

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Co-Authors

Wei Liu

ShanghaiTech University

Peidong Yang

Lawrence Berkeley National Laboratory

Xiangchen Hu

ShanghaiTech University

Letian Dou

Purdue University West Lafayette

Biao Yuan

University of Antwerp

Daqi Wang

Liaocheng University

Shaojie Chen

ShanghaiTech University

Shouwen Jin

Zhejiang A & F University

Wenbo Zhai

ShanghaiTech University

Zeyu Wang

Zhejiang Shuren University

Cooperative Institutions

Chinese Academy of Sciences

789

Institute of High Energy Physics

368

University of Chinese Academy of Sciences

354

University of Science and Technology of China

202

Tsinghua University

169

Southwest Jiaotong University

147

ShanghaiTech University

141

Peking University

131

Gansu Great Wall Electrical and Electronics Engineering Research Institute

130

Shanghai Jiao Tong University

119

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Electrocatalytic NiCo₂O₄ Nanofiber Arrays on Carbon Cloth for Flexible and High-Loading Lithium–Sulfur Batteries

Nano Letters (2021)

Shaojie Chen Jingxuan Zhang Zeyu Wang Lu Nie Xiangchen Hu

Lithium–sulfur batteries have ultrahigh theoretical energy densities, which makes them one of the most promising next-generation energy storage systems. However, it is still difficult to achieve large-scale commercialization because of the severe lithium polysulfide (LiPS) shuttle effect and low sulfur loading. Here, we report a flexible lithium–sulfur battery of a high sulfur loading with the assistance of NiCo2O4 nanofiber array grown carbon cloth. The NiCo2O4 nanofibers are ideal electrocatalysts for accelerating LiPS conversion kinetics through strong chemical interactions. Therefore, the composite cathode delivers a high specific capacity of 1280 mAh g–1 at 0.2 C with a sulfur loading of 3.5 mg cm–2, and it can maintain a high specific capacity of 660 mAh g–1 after 200 cycles, showing a good cycle stability. The "layer-by-layer" stacking strategy enables the Li–S battery with a high S loading of ∼9.0 mg cm–2 to deliver a high areal capacity of 8.9 mAh cm–2.

Polysulfide

Lithium–sulfur battery

Carbon fibers

10.1021/acs.nanolett.1c01422

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Citations (80)

Flexibility On-Demand: Multivariate 3D Covalent Organic Frameworks

Journal of the American Chemical Society (2023)

Meng Wang Tengwu Zeng Yi Yu Xun Wang Yingbo Zhao

Dynamic 3D covalent organic frameworks (dynaCOFs) have shown concerted structural transformation and responses upon adaptive guest adsorption. The multivariate (MTV) strategy incorporating multiple functionalities within a backbone is attractive for tuning the framework flexibility and dynamic responses. However, a major synthetic challenge arises from the different chemical reactivities of linkers usually resulting in phase separation. Here, we report a general synthetic protocol for making 3D MTV-COFs by balancing the linker reactivity and solvent polarity. Specifically, 15 crystalline and phase pure MTV-COF-300 isostructures are constructed by linking a tetrahedral unit with eight ditopic struts carrying various functional groups. We find that the electron-donating groups make the linker reactivity too low to allow the reaction to proceed fully, while the electron-withdrawing groups afford increased reactivity and hardly yield crystalline materials. To overcome the crystallization dilemma, the combination of polar aprotic with nonpolar solvents was used to improve the solubility of oligomers and slow the reaction kinetics in MTV-COF synthesis. We demonstrate the abilities of these MTV-COFs to tune gas dynamic behaviors and the separation of benzene and cyclohexane. These findings reveal the integration of multivariate functionalities into dynaCOFs with on-demand flexibility to achieve dynamic synergism in particular applications, outperforming their pure, monofunctional counterparts.

Reactivity

Linker

10.1021/jacs.3c11944

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Citations (19)

Adjustment of GDC layer microstructure and its influence on the electrochemical properties of microtubular SOFCs

Journal of the Ceramic Society of Japan (2015)

Karina Paciejewska Yi Yu Sascha K Uuml HN Andreas Weber Matthias Kleber

The development of a dense chemical reaction blocking layer (CRBL) for micro-tubular solid oxide fuel cells (SOFC) was the aim of this study. The electrochemical performance and stability of SOFCs were also investigated since they strongly depend on fabrication conditions for the electrolyte and CRBL layers. Slurries of two commercial Ce0.8Gd0.2O1.90 powders were prepared and deposited by dip coating onto micro-tubular SOFCs. The results indicate that the layer density and homogeneity are essentially determined by the width of particle size distribution (PSD) apart from the colloidal stability. Two methods were applied for achieving a narrow PSD additional to dispersion: grinding and centrifugation. Particles with a very narrow PSD obtained through centrifugation process could be sintered together even at 1300°C and a layer with a density close to 99% could be reached. In contrast, simple ultrasonic dispersion of powders diminished the distribution width insufficiently and gave porous layer. Impedance measurements showed clear relationship between GDC layer density and ohmic resistance of the cells which directly correlates to their performance with a power density 0.75 W/cm2 at 0.7 volt and OCV~1.06 V obtained at 850°C for the cells with the densest GDC layer.

Power density

10.2109/jcersj2.123.171

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Citations (7)

CCDC 1044446: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Xingjun Gao Yuting Zhang Qianqian Xie Weiqiang Xu Shouwen Jin

10.5517/ccdc.csd.cc141ttt

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Citations (0)

Structures of eleven organic acid-base adducts from 2-aminobenzothiazole/2-aminothiazole and acidic compounds

Journal of Molecular Structure (2021)

Xingjun Gao Yuting Zhang Qianqian Xie Weiqiang Xu Shouwen Jin

10.1016/j.molstruc.2021.130340

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Citations (12)

CCDC 1057763: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

Xingjun Gao Yuting Zhang Qianqian Xie Weiqiang Xu Shouwen Jin

10.5517/ccdc.csd.cc14hpdq

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Citations (0)

Self-Assembled Pt-Cofe Layered Double Hydroxides for Efficient Alkaline Water/Seawater Splitting by Spontaneous Redox Synthesis

SSRN Electronic Journal (2022)

Jin Wu Zhiwei Nie Renjie Xie Xiangchen Hu Yi Yu

The development of high-performance, low-cost and large-scale water/seawater splitting bifunctional electrocatalysts still faces huge challenges. Here, we deliver a novel and simple spontaneous redox synthesis strategy to fabricate a self-supported Pt-CoFe(II) layered double hydroxide (LDH) electrocatalyst. The three-dimensional porous structure of the catalyst and the synergistic effect of Pt clusters and CoFe hydroxides jointly contribute to its excellent catalytic activity and enhanced chemical stability. Specifically, in 1 M KOH, the overpotentials for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) of Pt-CoFe(II) LDH at 10 mA cm -2 are 214 mV and 15 mV, respectively. The catalysts are stable for at least 40 hours at high current densities of 100 and 500 mA cm -2 . Compared with previously reported electrocatalysts, Pt-CoFe(II) LDHs || Pt-CoFe(II) LDHs overall water (seawater) electrolyzers only require 1.634 (1.651) and 1.798 (1.858) V to reach 100 and 500 mA cm -2 in 1 M KOH water (seawater) electrolyte, confirming the superior catalytic activity of the self-supported Pt-CoFe(II) layered double hydroxide electrocatalysts. This study provides a novel and simple synthesis strategy to prepare advanced water/seawater splitting electrocatalysts, which is highly relevant for commercial applications.

Layered double hydroxides

10.2139/ssrn.4024917

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Citations (4)

Recent advancements in metal–organic frameworks for green applications

Green Energy & Environment (2020)

Chongxiong Duan Yi Yu Jing Xiao Yuanyuan Li Pengfei Yang

A series of environmental and energy issues, such as global warming, water pollution, acid rain, and energy shortage, have to be settled urgently. Metal–organic frameworks (MOFs) are compounds consisting of metal ions or clusters coordinated to organic ligands, which show great promise for alleviating or mitigating these challenges owing to their outstanding physical and chemical properties. In this review, we summarize the recent advances of MOFs in the fields of green applications, including carbon capture, harmful gas removal, sewage treatment, and green energy storage. In addition, the challenges and prospects of the large-scale commercialized use of MOFs in handling environmental issues are also discussed.

Economic shortage

Environmental Pollution

10.1016/j.gee.2020.04.006

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Citations (135)

Aromaticity of Hückel and Möbius Topologies Involved in Conformation Conversion of Macrocyclic [32]Octaphyrin(1.0.1.0.1.0.1.0): Refined Evidence from Multiple Visual Criteria

The Journal of Physical Chemistry C (2019)

Zeyu Liu Tian Lu Shugui Hua Yi Yu

A comprehensive investigation of the aromaticity control process of expanded porphyrins was carried out using a variety of visual criteria for the first time. The results show that the indicators based on magnetic property can be used to inspect the global aromaticity of [32]octaphyrins(1.0.1.0.1.0.1.0), whereas the methods according to electronic (de)localization are more suitable for the assessment of local aromaticity. The quasiplanar Hückel molecules with 32 π-electrons are shown to be distinctly antiaromatic, which follows the conventional 4n antiaromaticity Hückel's rule. The distortion of the molecular skeleton leads to weakening of π-conjugation in macrocycles, making the single-sided Möbius topologies with the same number of π-electron exhibit weak aromaticity. The seriously twisted figure-eight Hückel species are proved to be almost nonaromatic. These results agree well with our previous conclusions on aromaticity characteristic of the same system deduced from some numerical indexes. It is suggested necessary to extract evidence from multiple visual indicators for systematical analysis of the molecular aromaticity.

Antiaromaticity

Annulene

10.1021/acs.jpcc.9b06302

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Citations (44)

Revealing Solid Properties of High-energy-density Molecular Cocrystals from the Cooperation of Hydrogen Bonding and Molecular Polarizability

Scientific Reports (2019)

Lei Zhang Sheng-Li Jiang Yi Yu Jun Chen

In the domain of high-energy-density materials, the understanding to physico-chemical properties has long been primarily based on molecular structures whereas the crystal packing effect that significantly affects solid properties has been seldom involved. Herewith we predict the solid properties of six novel energetic cocrystals by taking into account of the crystal packing effect using a quantum chemistry method. We discover that the hydrogen bonding causes an increase in the molecular polarizability and their cooperation significantly changes the solid-state nature of the cocrystals compared to the pristine crystal and the gas counterparts. For example, stabilizing the multi-component molecular association by increasing the binding energy by 19-41% over the pristine crystals, improving the detonation performance by 5-10% and reducing the sensitivity to external stimuli compared to their pure crystal or gas counterparts. Therefore, the solid nature of the cocrystal is not a simple combination of the pure crystalline properties of its components and the heterogeneous molecular coupling effects must be considered to design improved functional cocrystals.

Cocrystal

Molecular solid

Crystal (programming language)

Crystal Engineering

Energy density

10.1038/s41598-018-37500-y

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Citations (22)