Multifunctional hollow sandwich structure with many active sites for electronic transfer modulation and its application in energy storage and conversion

2019 ◽  
Vol 4 (5) ◽  
pp. 1211-1220 ◽  
Author(s):  
Wen Wang ◽  
Jixin Yao ◽  
Xueqin Zuo ◽  
Qun Yang ◽  
Mingzai Wu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Active Sites ◽  
Sandwich Structure ◽  
Low Cost ◽  
Energy Storage And Conversion ◽  
Electronic Transfer ◽  
Fundamental Mechanism

Revealing the fundamental mechanism of effective, low-cost multifunctional electrocatalysts based on a hollow sandwich structure is desirable for energy storage and conversion.

scholarly journals Review on Carbon/Polyaniline Hybrids: Design and Synthesis for Supercapacitor

Molecules ◽  
2019 ◽  
Vol 24 (12) ◽  
pp. 2263 ◽  
Author(s):  
Xiaoning Wang ◽  
Dan Wu ◽  
Xinhui Song ◽  
Wei Du ◽  
Xiangjin Zhao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Hybrid Materials ◽  
Active Sites ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Low Cost ◽  
Specific Capacity ◽  
Chemical Properties ◽  
Combine Carbon

Polyaniline has been widely used in high-performance pseudocapacitors, due to its low cost, easy synthesis, and high theoretical specific capacitance. However, the poor mechanical properties of polyaniline restrict its further development. Compared with polyaniline, functionalized carbon materials have excellent physical and chemical properties, such as porous structures, excellent specific surface area, good conductivity, and accessibility to active sites. However, it should not be neglected that the specific capacity of carbon materials is usually unsatisfactory. There is an effective strategy to combine carbon materials with polyaniline by a hybridization approach to achieve a positive synergistic effect. After that, the energy storage performance of carbon/polyaniline hybridization material has been significantly improved, making it a promising and important electrode material for supercapacitors. To date, significant progress has been made in the synthesis of various carbon/polyaniline binary composite electrode materials. In this review, the corresponding properties and applications of polyaniline and carbon hybrid materials in the energy storage field are briefly reviewed. According to the classification of different types of functionalized carbon materials, this article focuses on the recent progress in carbon/polyaniline hybrid materials, and further analyzes their corresponding properties to provide guidance for the design, synthesis, and component optimization for high-performance supercapacitors.

Storage of hydrogen and lithium in inorganic nanotubes and nanowires

2006 ◽  
Vol 21 (11) ◽  
pp. 2744-2757 ◽  
Author(s):  
Fangyi Cheng ◽  
Jun Chen
Keyword(s):  
Energy Storage ◽  
High Efficiency ◽  
Low Cost ◽  
High Surface ◽  
Rechargeable Batteries ◽  
Energy Storage And Conversion ◽  
Electrochemical Characteristics ◽  
Environmental Benefit ◽  
Lithium Storage ◽  
Inorganic Nanotubes

The search for cleaner and more efficient energy storage and conversion technologies has become an urgent task due to increasing environmental issues and limited energy resources. The aim of energy storage and conversion is to obtain energy with environmental benefit, high efficiency, and low cost (namely, maximum atomic and recycling economy). Progress has been made in the fields of hydrogen storage and rechargeable batteries. The emerging nanotechnology offers great opportunities to improve the performance of existing energy storage systems. Applying nanoscale materials to energy storage offers a higher capacity compared to the bulk counterparts due to the unique properties of nanomaterials such as high surface areas, large surface-to-volume atom ratio, and size-confinement effect. In particular, one- dimensional (1D) inorganic nanostructures like tubes and wires exhibit superior electrochemical characteristics because of the combined advantages of small size and 1D morphology. Hydrogen and lithium can be stored in different 1D nanostructures in various ways, including physical and/or chemical sorption, intercalation, and electrochemical reactions. This review highlights some of the latest progress with the studies of hydrogen and lithium storage in inorganic nanotubes and nanowires such as MoS2, WS2, TiS2, BN, TiO2, MnO2, V2O5, Fe2O3, Co3O4, NiO, and SnO2.

scholarly journals Ultrathin Ti3C2Tx (MXene) Nanosheet-Wrapped NiSe2 Octahedral Crystal for Enhanced Supercapacitor Performance and Synergetic Electrocatalytic Water Splitting

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Hanmei Jiang ◽  
Zegao Wang ◽  
Qian Yang ◽  
Luxi Tan ◽  
Lichun Dong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Active Sites ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Interfacial Interaction ◽  
Energy Storage And Conversion ◽  
Excellent Electrochemical Performance ◽  
Strong Interfacial Interaction ◽  
Supercapacitor Performance ◽  
Metal Selenides

Abstract Metal selenides, such as NiSe2, have exhibited great potentials as multifunctional materials for energy storage and conversation. However, the utilization of pure NiSe2 as electrode materials is limited by its poor cycling stability, low electrical conductivity, and insufficient electrochemically active sites. To remedy these defects, herein, a novel NiSe2/Ti3C2Tx hybrid with strong interfacial interaction and electrical properties is fabricated, by wrapping NiSe2 octahedral crystal with ultrathin Ti3C2Tx MXene nanosheet. The NiSe2/Ti3C2Tx hybrid exhibits excellent electrochemical performance, with a high specific capacitance of 531.2 F g−1 at 1 A g−1 for supercapacitor, low overpotential of 200 mV at 10 mA g−1, and small Tafel slope of 37.7 mV dec−1 for hydrogen evolution reaction (HER). Furthermore, greater cycling stabilities for NiSe2/Ti3C2Tx hybrid in both supercapacitor and HER have also been achieved. These significant improvements compared with unmodified NiSe2 should be owing to the strong interfacial interaction between NiSe2 octahedral crystal and Ti3C2Tx MXene, which provides enhanced conductivity, fast charge transfer as well as abundant active sites, and highlight the promising potentials in combinations of MXene with metal selenides for multifunctional applications such as energy storage and conversion.

Accurately Metal-Modulated Bimetallic Metal-Organic Frameworks as an Advanced Trifunctional Electrocatalyst

2021 ◽  
Author(s):  
Xin Chen ◽  
Bing Shao ◽  
Meng-Juan Tang ◽  
Xing-Lu He ◽  
Fujie Yang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
Energy Storage And Conversion ◽  
Efficient Integration ◽  
Metal Organic ◽  
Catalytic Active Sites

To fabricate an efficient integration of multifunctional electrocatalysts for energy storage and conversion is still a great challenge, due to the difficulty to precisely identify and regulate catalytic active sites....

High-Potential Pseudocapacitive Energy Storage System: Iron-Based Polyferric Sulfate Electrolyte and Partially Sacrificial Graphite Electrode

2021 ◽  
Vol 13 (3) ◽  
pp. 490-496
Author(s):  
Wei Pan ◽  
Mu Zhang ◽  
Wenyi Tang ◽  
Yanyan Man ◽  
Kunfeng Chen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Active Sites ◽  
Graphite Electrode ◽  
Low Cost ◽  
Storage System ◽  
Energy Storage System ◽  
High Energy ◽  
Sulfate Electrolyte ◽  
High Area ◽  
Different Characteristics

Tremendous research works including nanofabrication techniques and crystal defect preparation approaches have been applied to enhance the capacitance of bulk materials. However, a comprehensive understanding of active sites in the reaction process is an enigma for all researchers. This work reported an environmentally friendly system with a basic polymerized ferric sulfate (BPFS) electrolyte and electroactive graphite electrode, which achieved high area capacitance and showed the different characteristics of active sites. This enhanced energy storage system shows the evidence that carbon materials are electrochemically activated as a result that active groups could react with iron groups in aqueous solutions. A high area specific capacitance of 12 F cm-2(1255 F g-1) is obtained in a mixed BPFS at 5 mV s-1 in a potential window of 2.1 V in a three-electrode cell. In an aqueous solution capacitor, a capacity of 4.8 F cm-2 at 30 mA from 0 V to 1.5 V is achieved at room temperature. It has the potential to develop a low-cost, high energy storage, and high safety system, which can be a lead-acid battery substitute.

Low-cost and high safe manganese-based aqueous battery for grid energy storage and conversion

2019 ◽  
Vol 64 (23) ◽  
pp. 1780-1787 ◽  
Author(s):  
Jianhang Huang ◽  
Zhaowei Guo ◽  
Xiaoli Dong ◽  
Duan Bin ◽  
Yonggang Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Low Cost ◽  
Energy Storage And Conversion ◽  
Aqueous Battery

“Cooking” Hierarchically Porous Carbons with Phenolic Molecules and Zinc Salts

2021 ◽  
Author(s):  
Le-Le Zhang ◽  
Lei Tong ◽  
Yanwei Ding ◽  
Lin-Wei Chen ◽  
Yuxia Bai ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heterogeneous Catalysis ◽  
Mass Transport ◽  
Active Sites ◽  
Energy Storage And Conversion ◽  
Porous Carbons ◽  
Hierarchically Porous ◽  
Zinc Salts

Hierarchically porous carbons (HPCs) with multimodal pore systems have structural advantages of exposuring active sites and promoting mass transport for applications in heterogeneous catalysis, energy storage, and conversion. Here, we...

Electrochemically active sites inside crystalline porous materials for energy storage and conversion

2020 ◽  
Vol 49 (8) ◽  
pp. 2378-2407 ◽  
Author(s):  
Lingjun Kong ◽  
Ming Zhong ◽  
Wei Shuang ◽  
Yunhua Xu ◽  
Xian-He Bu
Keyword(s):  
Energy Storage ◽  
Porous Materials ◽  
Active Sites ◽  
Rational Design ◽  
Electrochemical Energy Storage ◽  
Energy Storage And Conversion ◽  
Electrochemically Active ◽  
Electrochemical Energy

This review provides references for the preparation of electroactive CPMs via rational design and modulation of active sites and the space around them, and their application in electrochemical energy storage and conversion systems.

scholarly journals Research Progress on Applications of Polyaniline (PANI) for Electrochemical Energy Storage and Conversion

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 548 ◽  
Author(s):  
Zhihua Li ◽  
Liangjun Gong
Keyword(s):  
Fuel Cells ◽  
Energy Storage ◽  
Composite Structures ◽  
Active Sites ◽  
Carbon Materials ◽  
Rechargeable Batteries ◽  
Electrochemical Energy Storage ◽  
Research Progress ◽  
Energy Storage And Conversion ◽  
Electrochemical Energy

Conducting polyaniline (PANI) with high conductivity, ease of synthesis, high flexibility, low cost, environmental friendliness and unique redox properties has been extensively applied in electrochemical energy storage and conversion technologies including supercapacitors, rechargeable batteries and fuel cells. Pure PANI exhibits inferior stability as supercapacitive electrode, and can not meet the ever-increasing demand for more stable molecular structure, higher power/energy density and more N-active sites. The combination of PANI and other active materials like carbon materials, metal compounds and other conducting polymers (CPs) can make up for these disadvantages as supercapacitive electrode. As for rechargeable batteries and fuel cells, recent research related to PANI mainly focus on PANI modified composite electrodes and supported composite electrocatalysts respectively. In various PANI based composite structures, PANI usually acts as a conductive layer and network, and the resultant PANI based composites with various unique structures have demonstrated superior electrochemical performance in supercapacitors, rechargeable batteries and fuel cells due to the synergistic effect. Additionally, PANI derived N-doped carbon materials also have been widely used as metal-free electrocatalysts for fuel cells, which is also involved in this review. In the end, we give a brief outline of future advances and research directions on PANI.

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