Wyniki wyszukiwania dla: Zhenyuan Ji

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Rational Design of High‐Performance Electrodes Based on Ferric Oxide Nanosheets Deposited on Reduced Graphene Oxide for Advanced Hybrid Supercapacitors

Zhenyuan Ji, Lizhi Chen, Guanxiang Tang, Jiali Zhong, więcej

Small > 20 > 15 > n/a - n/a

The core strategy for constructing ultra‐high‐performance hybrid supercapacitors is the design of reasonable and effective electrode materials. Herein, a facile solvothermal‐calcination strategy is developed to deposit the phosphate‐functionalized Fe₂O₃ (P‐Fe₂O₃) nanosheets on the reduced graphene oxide (rGO) framework. Benefiting from the superior conductivity of rGO and the high conductivity and...

artykuł

Nitrogen‐Doped Carbon Dots Modified Fe–Co Sulfide Nanosheets as High‐Efficiency Electrocatalysts toward Oxygen Evolution Reaction

Lei Wu, Hanli Qin, Zhenyuan Ji, Hu Zhou, więcej

Small > 20 > 4 > n/a - n/a

Developing high‐efficiency and stable oxygen evolution reaction (OER) electrocatalysts is an imperative requirement to produce green and clean hydrogen energy. In this work, the FeCoS_y/NCDs composite with nitrogen‐doped carbon dots (NCDs) modified Fe–Co sulfide (FeCoS_y) nanosheets is prepared by using a facile and mild one‐pot solvothermal method. Benefiting from the low crystallinity and the synergistic...

artykuł

Facile Synthesis of Medium‐Entropy Metal Sulfides as High‐Efficiency Electrocatalysts toward Oxygen Evolution Reaction

Lei Wu, Xiaoping Shen, Zhenyuan Ji, Jiaren Yuan, więcej

Advanced Functional Materials > 33 > 3 > n/a - n/a

Developing highly efficient and durable electrocatalysts toward oxygen evolution reaction (OER) is an urgent demand to produce clean hydrogen energy. In this study, a series of medium‐entropy metal sulfides (MEMS) of (NiFeCoX)₃S₄ (where X = Mn, Cr, Zn) are synthesized by a facile one‐pot solvothermal strategy using molecular precursors. Benefiting from the multiple‐metal synergistic effect and the...

artykuł

NiFe‐NiFe₂O₄/rGO composites: Controlled preparation and superior lithium storage properties

Huaiyang Chen, Xiaoping Shen, Keqiang Xu, Yao Chen, więcej

Journal of the American Ceramic Society > 104 > 12 > 6696 - 6708

Binary transition‐metal oxides with spinel structure have great potential as advanced anode materials for lithium‐ion batteries (LIBs). Herein, NiFe‐NiFe₂O₄/ reduced graphene oxide (rGO) composites are obtained via a facile cyanometallic framework precursor strategy to improve the lithium storage performance of NiFe₂O₄. In the composites, NiFe‐NiFe₂O₄ nanoparticles with adjustable mass ratios of NiFe...

artykuł

Construction of rGO‐Encapsulated Co₃O₄‐CoFe₂O₄ Composites with a Double‐Buffer Structure for High‐Performance Lithium Storage

Keqiang Xu, Xiaoping Shen, Chunsen Song, Huaiyang Chen, więcej

Small > 17 > 34 > n/a - n/a

Transition metal oxides (TMOs) are promising anode materials for next‐generation lithium‐ion batteries (LIBs). Nevertheless, their poor electronic and ionic conductivity as well as huge volume change leads to low capacity release and rapid capacity decay. Herein, a reduced graphene oxide (rGO)‐encapsulated TMOs strategy is developed to address the above problems. The Co₃O₄‐CoFe₂O₄@rGO composites with...

artykuł

Flexible and stretchable polyaniline supercapacitor with a high rate capability

Zhixuan Huang, Zhenyuan Ji, Yuping Feng, Panpan Wang, więcej

Polymer International > 70 > 4 > 437 - 442

Flexible electronics are currently highly favored because of their promising applications in flexible displays, artificial electronic skin, wearable devices etc. Exploiting flexible energy storage systems, which are supercapacitors, that have a decent electrochemical performance as well as flexibility and stretchability is essential to promote the development of flexible electronic products. In this...

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Intrinsic Structure Modification of Electrode Materials for Aqueous Metal‐Ion and Metal‐Air Batteries

Wei Ling, Hua Wang, Zhe Chen, Zhenyuan Ji, więcej

Advanced Functional Materials > 31 > 5 > n/a - n/a

In consideration of low cost, simple operation, safe reliability, and environmental benignity, aqueous rechargeable batteries (ARBs) have attracted great interest among portable electronic devices, energy storage, and power source batteries. As the key components of ARBs, the electrode materials lead to a crucial effect for the overall battery properties, such as working voltage, electrocatalytic...

artykuł

Incorporation of Fe/Co species on carbon: A facile strategy for boosting oxygen evolution

Yinan Yu, Yuanjun Liu, Suxiao Ju, Xiaoping Shen, więcej

Inorganic Chemistry Communications > 2020 > 111 > C

Scaling up new transition metal-based oxygen evolution catalysts for practical applications is still hindered by the complex synthesis route. In this study, in situ formation of electrocatalytic active species is simply achieved with a mixture ink composed of Nafion binder, commercially available acetylene black, and Fe ³⁺ /Co ²⁺ ions. In this route, energy-intensive material preparation steps or...

artykuł

Chitosan-assisted synthesis of wearable textile electrodes for high-performance electrochemical energy storage

Xiaomei He, Peng Song, Xiaoping Shen, Yiming Sun, więcej

Cellulose > 2019 > 26 > 17 > 9349-9359

Through a facile “dipping and drying” process, reduced graphene oxide, here simply referred to as “graphene”, was successfully coated onto a commercial textile substrate, resulting in a high-performance supercapacitor electrode with excellent flexibility and stretchability. With the assistance of difunctional chitosan (for dispersing and gluing), a high graphene loading amount of 5.5 mg cm⁻² was achieved...

artykuł

Nickel@Nitrogen‐Doped Carbon@MoS₂ Nanosheets: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

Sayyar Ali Shah, Xiaoping Shen, Minghua Xie, Guoxing Zhu, więcej

Small > 15 > 9 > n/a - n/a

Developing cheap, abundant, and easily available electrocatalysts to drive the hydrogen evolution reaction (HER) at small overpotentials is an urgent demand of hydrogen production from water splitting. Molybdenum disulfide (MoS₂) based composites have emerged as competitive electrocatalysts for HER in recent years. Herein, nickel@nitrogen‐doped carbon@MoS₂ nanosheets (Ni@NC@MoS₂) hybrid sub‐microspheres...

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Nitrogen-doped carbon dots modified dibismuth tetraoxide microrods: A direct Z-scheme photocatalyst with excellent visible-light photocatalytic performance

Xiaoyang Yue, Xuli Miao, Zhenyuan Ji, Xiaoping Shen, więcej

Journal of Colloid and Interface Science > 2018 > 531 > C > 473-482

O₂⁻ and direct h⁺ oxidation play important roles in the degradation process, and based on the experimental result a direct Z-scheme photocatalytic mechanism is proposed. This study suggests that the as-prepared m-Bi₂O₄/NCDs composite is a promising photocatalyst for environmental remediation.

artykuł

Cellulose-derived nitrogen-doped hierarchically porous carbon for high-performance supercapacitors

Peng Song, XiaoPing Shen, XiaoMei He, KaiHui Feng, więcej

Cellulose > 2019 > 26 > 2 > 1195-1208

Heteroatom-doped porous carbon materials are one of the most promising electrodes for high-performance supercapacitors. However, the development of a simple, green and low-cost strategy for their preparation is still highly challenging. In this study, we reported a simple and sustainable preparation of nitrogen-doped hierarchically porous carbon (NHPC) by using cellulose as raw materials. A NaOH/urea...

artykuł

An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO₂ Hollow Microspheres

Miaomiao Liu, Zhenyuan Ji, Xiaoping Shen, Hu Zhou, więcej

European Journal of Inorganic Chemistry > 2018 > 35 > 3952 - 3959

Transition metal oxides (TMO) are promising candidates for low‐cost and high‐efficiency catalysts for the hydrogen evolution reaction (HER). However, the low conductivity and severe agglomeration of catalyst particles hinder their practical application. Herein, we report an effective HER electrocatalyst of 3D‐rGO‐CeO₂ with three‐dimensional reduced graphene oxide (3D‐rGO) decorated with CeO₂ hollow...

artykuł

Protein-derived nitrogen-doped hierarchically porous carbon as electrode material for supercapacitors

Peng Song, Xiaoping Shen, Wenfeng He, Lirong Kong, więcej

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 14 > 12206- 12215

This study aimed at developing supercapacitor electrode materials from textile industry waste, thereby mediating waste disposal problem through reuse. Through a simple two-step process, nitrogen-doped hierarchically porous carbons (NHPC) derived from sericin, a waste protein, were synthesized and used for electrochemical capacitors for the first time. The as-prepared NHPC with a specific surface area...

artykuł

Belt-like nickel hydroxide carbonate/reduced graphene oxide hybrids: Synthesis and performance as supercapacitor electrodes

Chunyan Xi, Guoxing Zhu, Yuanjun Liu, Xiaoping Shen, więcej

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2018 > 538 > C > 748-756

Supercapacitors with superior performance and long cycling ability are attractive for the next-generation energy storage devices. Herein, an unique hybrid of nickel hydroxide carbonate nanobelts densely and strongly anchored on reduced graphene oxide nanosheets (HC/RGO) has been designed and synthesized through a facile hydrothermal approach. The as-prepared HC/RGO composites display a nearly two-dimensional...

artykuł

Three-dimensional N-doped graphene/polyaniline composite foam for high performance supercapacitors

Jun Zhu, Lirong Kong, Xiaoping Shen, Quanrun Chen, więcej

Applied Surface Science > 2018 > 428 > C > 348-355

Three-dimensional (3D) graphene aerogel and its composite with interconnected pores have aroused continuous interests in energy storage field owning to its large surface area and hierarchical pore structure. Herein, we reported the preparation of 3D nitrogen-doped graphene/polyaniline (N-GE/PANI) composite foam for supercapacitive material with greatly improved electrochemical performance. The 3D...

artykuł

One-step thermal synthesis of nickel nanoparticles modified graphene sheets for enzymeless glucose detection

Zhenyuan Ji, Yuqin Wang, Qiang Yu, Xiaoping Shen, więcej

Journal of Colloid and Interface Science > 2017 > 506 > C > 678-684

The development of accurate, reliable and low cost devices for glucose detection is one of the most important scientific and technological hotspots. In this study, we proposed a unique one-step thermal synthesis strategy to synthesize nickel (Ni) nanoparticles modified graphene (GE) sheets by using metal-oleate complex as the precursor and sodium sulfate as a template. With the assistance of sodium...

artykuł

Research on micro-Doppler feature of spatial target

Zhenyuan Ji, Encheng Hu, Yun Zhang, Hongyan Jin

EURASIP Journal on Wireless Communications and Networking > 2017 > 2017 > 1 > 1-9

The micro-Doppler (m-D) effect which is also called micro-motion effect is a kind of physical phenomenon, which is often produced in ISAR imaging of space targets. When the space target has a micro-Doppler effect, it will produce frequency modulation for the radar echo and cause serious interference to ISAR imaging of the target. In this paper, the micro-spin model is modeled, and the echo of micro-spin...

artykuł

g-C3N4/AgBr nanocomposite decorated with carbon dots as a highly efficient visible-light-driven photocatalyst

Xuli Miao, Zhenyuan Ji, Jiajia Wu, Xiaoping Shen, więcej

Journal of Colloid and Interface Science > 2017 > 502 > C > 24-32

Visible-light-driven photocatalysis as a green technology has attracted intense interest due to its potential applications in environmental remediation. However, the poor visible light utilization and low electron-hole separation efficiency of photocatalysts largely limited their practical application. In this work, a new ternary visible-light driven photocatalyst of g-C₃N₄/CDs/AgBr has been prepared...

artykuł

Ionic Liquid Templated Porous Boron-Doped Graphitic Carbon Nitride Nanosheet Electrode for High-Performance Supercapacitor

Lirong Kong, Quanrun Chen, Xiaoping Shen, Chao Xia, więcej

Electrochimica Acta > 2017 > 245 > C > 249-258

Two dimensional heteroatoms-doped graphitic carbon electrode materials could exhibit better capacitive properties than undoped carbon materials. However, since the configuration and the content of the heteroatoms as well as their porous structure are difficult to control, the improvement of their energy storage performance is limited. Here, we report a hierarchically porous boron-doped graphitic carbon...

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