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Author

Wang Yang

Bio: Wang Yang is an academic researcher from Yanshan University. The author has contributed to research in topics: Supercapacitor & Carbon. The author has an hindex of 13, co-authored 20 publications receiving 1019 citations.

Papers
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Journal ArticleDOI
Wang Yang1, Wu Yang1, Lina Kong1, Ailing Song1, Xiujuan Qin1, Guangjie Shao1 
01 Feb 2018-Carbon
TL;DR: In this article, three-dimensional hierarchical porous carbons (P-3DHPCs) have been synthesized by direct pyrolysis of mixture containing glucose, manganese nitrate and sodium hypophosphite without any hard templates.

272 citations

Journal ArticleDOI
Wang Yang1, Wu Yang1, Fei Ding, Lin Sang, Zhipeng Ma1, Guangjie Shao1 
01 Jan 2017-Carbon
TL;DR: In this paper, the ultrathin porous carbon shell with the thickness of about 10nm has been fabricated by a facile method using sodium citrate as carbon precursor without any activation.

222 citations

Journal ArticleDOI
Wu Yang1, Wang Yang1, Ailing Song1, Gang Sun1, Guangjie Shao1 
TL;DR: Novel 3D interconnected porous carbon nanosheets/carbon nanotubes (denoted as PC/CNT) as a polysulfide reservoir are synthesized by a simple one-pot pyrolysis method, exhibiting outstanding electrochemical performance.
Abstract: Carbon materials have attracted considerable attention as the hosts for lithium-sulfur batteries, especially the 3D structural carbon matrix. Herein, novel 3D interconnected porous carbon nanosheets/carbon nanotubes (denoted as PC/CNT) as a polysulfide reservoir are synthesized by a simple one-pot pyrolysis method. In the designed hybrid carbon matrix, porous carbon nanosheets exhibit hierarchical porous structures for high sulfur loading and effectively strengthen the physical confinement to trap soluble polysulfides, while carbon nanotubes provide a highly robust conductive pathway which can facilitate electron transport and maintain structural integrity. Moreover, the 3D interconnected structure combining 1D carbon nanotubes and 2D porous carbon nanosheets is beneficial for rapid electrical/ionic transport and favorable electrolyte infiltration. As a result, the S-PC/CNT composite exhibits outstanding electrochemical performance, with a high active-sulfur utilization, high specific capacity (1485.4, 1300.3 and 1138 mA h g-1 at 0.5, 1 and 2 C, respectively), superior cycling stability (only 0.1% capacity decay per cycle over 400 cycles at 2 C) and excellent rate capability (the reversible capacity of 749 mA h g-1 even at 4 C).

146 citations

Journal ArticleDOI
Wang Yang1, Wu Yang1, Ailing Song1, Lijun Gao1, Li Su1, Guangjie Shao1 
TL;DR: In this paper, the synthesis of porous carbon with hierarchical pore structure and uniform nitrogen-sulfur-oxygen doping was reported, which showed good electrochemical performance when employed as supercapacitor electrode.

105 citations

Journal ArticleDOI
Wu Yang1, Wang Yang1, Ailing Song1, Lijun Gao1, Gang Sun1, Guangjie Shao1 
TL;DR: In this article, a surface protective layer of polypyrrole can be formed on the sulfur cathode, which not only acts as a conductive agent to provide an effective electron conduction path but also acts as an absorbing agent and barrier layer suppressing the diffusion of polysulfide intermediates.

95 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors reviewed the thermal risk of commercial electrolytes and the development of safer electrolytes, and provided a reference for the design of next generation of electrolytes.

441 citations

Journal ArticleDOI
TL;DR: In this paper, a review of hierarchical porous carbons for supercapacitors is presented, where the authors introduce different pore types and define hierarchical porous structures, followed by discussion and exemplification of major synthesis strategies.
Abstract: Carbon materials, owing to their excellent electrical conductivity, tailorability, inexpensiveness and versatility, have been extensively studied as electrode materials for supercapacitors. The capacitance of carbon-based supercapacitor electrodes has remained at a mediocre level between 100 and 200 F g−1 for decades. Until recently, a new family of carbon materials termed hierarchical porous carbons has pushed the capacitance to new benchmark values beyond 300 F g−1, and has revitalized the exploration of carbon materials for supercapacitors. Hierarchical porous carbons contain different scales of pores (from micropores to macropores) inter-connected together and assembled in hierarchical patterns. Experimental studies coupled with theoretical investigations have elucidated that the presence of micropores is responsible for offering a large surface area to enhance charge storage capability, whilst mesopores, macropores and the hierarchical structure improve electrolyte infiltration and facilitate ion diffusion. This review will start by introducing different pore types and the definition of hierarchical porous structures, followed by discussion and exemplification of major synthesis strategies. In addition, recent molecular-level understanding of the relationship between pore size, functionalities inside pores, pore spatial distribution and capacitive performance is presented. Finally, challenges and future opportunities associated with hierarchical porous carbons for supercapacitors are discussed.

419 citations

Journal ArticleDOI
TL;DR: Metrics for the evaluation of lithium batteries are discussed, based on which the regulating role of CNTs and graphene in Li-ion and Li-S batteries is comprehensively considered from fundamental electrochemical reactions to electrode structure and integral cell design.
Abstract: The ever-increasing demands for batteries with high energy densities to power the portable electronics with increased power consumption and to advance vehicle electrification and grid energy storage have propelled lithium battery technology to a position of tremendous importance. Carbon nanotubes (CNTs) and graphene, known with many appealing properties, are investigated intensely for improving the performance of lithium-ion (Li-ion) and lithium-sulfur (Li-S) batteries. However, a general and objective understanding of their actual role in Li-ion and Li-S batteries is lacking. It is recognized that CNTs and graphene are not appropriate active lithium storage materials, but are more like a regulator: they do not electrochemically react with lithium ions and electrons, but serve to regulate the lithium storage behavior of a specific electroactive material and increase the range of applications of a lithium battery. First, metrics for the evaluation of lithium batteries are discussed, based on which the regulating role of CNTs and graphene in Li-ion and Li-S batteries is comprehensively considered from fundamental electrochemical reactions to electrode structure and integral cell design. Finally, perspectives on how CNTs and graphene can further contribute to the development of lithium batteries are presented.

393 citations

Journal ArticleDOI
TL;DR: Some answers are provided to the question "How and why anchoring metal nanoparticles, clusters, or single atoms on carbon materials for catalysis?", and some important effects in catalysis inherent to the presence of a carbon-type support are described.
Abstract: The support plays an important role for supported metal catalysts by positioning itself as a macromolecular ligand, which conditions the nature of the active site and contributes indirectly but also sometimes directly to the reactivity. Metal species such as nanoparticles, clusters, or single atoms can be deposited on carbon materials for various catalytic reactions. All the carbon materials used as catalyst support constitute a large family of compounds that can vary both at textural and at structural levels. Today, the recent developments of well-controlled synthesis methodologies, advanced characterization techniques, and modeling tools allow one to correlate the relationships between metal/support/reactant at the molecular level. Based on these considerations, in this Review article, we wish to provide some answers to the question "How and why anchoring metal nanoparticles, clusters, or single atoms on carbon materials for catalysis?". To do this, we will rely on both experimental and theoretical studies. We will first analyze what sites are available on the surface of a carbon support for the anchoring of the active phase. Then, we will describe some important effects in catalysis inherent to the presence of a carbon-type support (metal-support interaction, confinement, spillover, and surface functional group effects). These effects will be commented on by putting into perspective catalytic results obtained in numerous reactions of thermal catalysis, electrocatalysis, or photocatalysis.

371 citations

Journal ArticleDOI
TL;DR: In this paper, the typical applications of computational chemistry in Li-S battery studies, correlating to characterization techniques, such as X-ray diffraction, infra-red & Raman spectra, X -ray absorption spectroscopy, binding energy, and nuclear magnetic resonance, are reviewed.

367 citations