“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...

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....

Achieving high-powered Zn/air fuel cell through N and S co-doped hierarchically porous carbons with tunable active-sites as oxygen electrocatalysts

2017 ◽  
Vol 365 ◽  
pp. 348-353 ◽  
Author(s):  
Qiaowei Tang ◽  
Luming Wang ◽  
Mingjie Wu ◽  
Nengneng Xu ◽  
Lei Jiang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Active Sites ◽  
Porous Carbons ◽  
Hierarchically Porous ◽  
Co Doped

scholarly journals A Facile Route to Synthesis of Hierarchically Porous Carbon via Micelle System for Bifunctional Electrochemical Application

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaojian Hou ◽  
Yi Song ◽  
Yueju Zhao ◽  
Wenxiu Li ◽  
Zanwu Guo ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Active Sites ◽  
Mesoporous Structure ◽  
Pluronic F127 ◽  
Polymerization Process ◽  
Energy Storage And Conversion ◽  
Scale Production ◽  
Metallic Oxide ◽  
Hierarchically Porous ◽  
Micelle System

Well-ordered hierarchically porous carbon (HPC) nanomaterials have been successfully synthesized by a facile, efficient, and fast heated-evaporation induced self-assembly (HISA) method. A micelle system was employed as the template by using the HISA method for the first time, which possessed great potential in the large-scale production of HPC materials. Various surfactants, including triblock copolymer Pluronic F127, P123, F108, and cationic CTAB, were used in the polymerization process as templates to reveal the relationship between the structure of surfactants and architecture of the as-prepared HPCs. Transmission electron microscopy (TEM), X-ray diffraction (XRD), Nitrogen adsorption, and Fourier transform infrared (FTIR) measurements were conducted to investigate the morphology, structure, and components of HPCs, which further confirmed the well-ordered and uniform mesoporous structure. The as-prepared HPC sample with F127 possessed the largest specific surface area, suitable pore size, and well-ordered mesoporous structure, resulting in better electrochemical performance as electrodes in the fields of energy storage and conversion system. Doped with the metallic oxide MnO2, the MnO2/HPC composites presented the outstanding electrochemical activity in supercapacitor with a high specific capacitance of 531.2 F g−1 at 1 A g−1 and excellent cycling performance with little capacity fading, even after 5,000 cycles. Moreover, the obtained sample could also be applied in the fields of oxygen reduction reaction (ORR) for its abundant active sites and regulate architecture. This versatile approach makes the mass industrial production of HPC materials possible in electrochemical applications through a facile and fast route.

scholarly journals Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yang Li ◽  
Wang Yang ◽  
Wu Yang ◽  
Ziqi Wang ◽  
Jianhua Rong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Functional Groups ◽  
Active Sites ◽  
High Energy ◽  
High Energy Density ◽  
Porous Surface ◽  
Hierarchically Porous ◽  
Hybrid Supercapacitors ◽  
Fibrous Carbon ◽  
Adsorption Desorption

AbstractAqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional groups. Hierarchically porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage, but also optimizes ion transport kinetics. Consequently, the cathodes show a high gravimetric capacity of 156 mAh g−1, superior rate capability (79 mAh g−1 with a very short charge/discharge time of 14 s) and exceptional cycling stability. Meanwhile, hierarchical pore structure and suitable surface functional groups of the cathodes endow ZHSs with a high energy density of 127 Wh kg−1, a high power density of 15.3 kW kg−1 and good anti-self-discharge performance. Mechanism investigation reveals that ZHS electrochemistry involves cation adsorption/desorption and Zn4SO4(OH)6·5H2O formation/dissolution at low voltage and anion adsorption/desorption at high voltage on carbon cathodes. The roles of these reactions in energy storage of ZHSs are elucidated. This work not only paves a way for high-performance cathode materials of ZHSs, but also provides a deeper understanding of ZHS electrochemistry.

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.

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