Hollow carbon microtubes from kapok fiber: structural evolution and energy storage performance

2018 ◽  
Vol 2 (2) ◽  
pp. 455-465 ◽  
Author(s):  
Yufang Cao ◽  
Lijing Xie ◽  
Guohua Sun ◽  
Fangyuan Su ◽  
Qing-Qiang Kong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Structural Evolution ◽  
Organic Electrolyte ◽  
Kapok Fiber ◽  
Storage Performance ◽  
Hollow Carbon ◽  
Co Doped

The N–P co-doped hollow carbon microtubules derived from kapok exhibited an excellent capability in the organic electrolyte systems.

Thermochemical energy storage performance of Al2O3/CeO2 co-doped CaO-based material under high carbonation pressure

2020 ◽  
Vol 263 ◽  
pp. 114650 ◽  
Author(s):  
Hao Sun ◽  
Yingjie Li ◽  
Xianyao Yan ◽  
Jianli Zhao ◽  
Zeyan Wang
Keyword(s):  
Energy Storage ◽  
Storage Performance ◽  
Co Doped

scholarly journals Effect of KOH on the Energy Storage Performance of Molasses-Based Phosphorus and Nitrogen Co-Doped Carbon

Electrochem ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 29-41
Author(s):  
Iris Denmark ◽  
Samantha Macchi ◽  
Fumiya Watanabe ◽  
Tito Viswanathan ◽  
Noureen Siraj
Keyword(s):  
Energy Storage ◽  
Specific Capacitance ◽  
Current Density ◽  
High Current Density ◽  
Chemical Activation ◽  
Renewable Resource ◽  
Surface Functionality ◽  
Storage Performance ◽  
Cost Efficient ◽  
Co Doped

In this study, we have evaluated the effect of potassium hydroxide (KOH) on the energy storage performance of metal-free carbon-based materials prepared from molasses. Molasses are a renewable-resource biomass and economical by-product of sugar refinement, used here as a carbon precursor. Two co-doped carbon materials using molasses were synthesized via a time and cost-efficient microwave carbonization process, with ammonium polyphosphate as a phosphorus and nitrogen doping agent. The phosphorus and nitrogen co-doped carbon (PNDC) samples were prepared in the presence and absence of a chemical activating agent (KOH), to study the role of chemical activation on PNDCs. Physical characterizations were performed to gain insight into the composition, pore size and topographical data of each material. Electrochemical characterization via cyclic voltammetry in 1 M sulfuric acid (H2SO4) as well as in 6 M KOH as electrolytes, revealed high current density and specific capacitance for the chemically activated material (PNDC2) compared to one without chemical activation (PNDC1). The capacitance value of 244 F/g in KOH electrolyte was obtained with PNDC2. It is concluded that addition of KOH prior to carbonization increases the surface functionality, which significantly enhances the electrochemical properties of the PNDC material such as current density, stability, and specific capacitance.

Hierarchical Co-doped SnS2@Ni(OH)2 double-shell crystalline structure on carbon cloth with gradient pore distribution for superior capacitance

CrystEngComm ◽  
2020 ◽  
Vol 22 (30) ◽  
pp. 5067-5072
Author(s):  
Kuan Deng ◽  
Feifei Wang ◽  
Wen Tian ◽  
Zhufeng Hu ◽  
Hualian Zhang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Transfer Rate ◽  
Pore Distribution ◽  
Carbon Cloth ◽  
Ion Transfer ◽  
Storage Performance ◽  
Aligned Arrays ◽  
Nanosheet Arrays ◽  
Vertically Aligned ◽  
Co Doped

Hierarchical Co-doped SnS2@Ni(OH)2 double-shell nanosheet arrays are coated on carbon cloth, the vertically aligned arrays with gradient pore distribution can facilitate the charge/ion transfer rate, thus improve the energy storage performance.

Giant electro-strain and enhanced energy storage performance of (Y0.5Ta0.5)4+ co-doped 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3 lead-free ceramics

2020 ◽  
Vol 46 (1) ◽  
pp. 281-288 ◽  
Author(s):  
Benben Yan ◽  
Huiqing Fan ◽  
Chao Wang ◽  
Mingchang Zhang ◽  
Arun Kumar Yadav ◽  
...  
Keyword(s):  
Energy Storage ◽  
Lead Free ◽  
Storage Performance ◽  
Lead Free Ceramics ◽  
Co Doped

Tunable Carbon Surface from Mono- to Multi-Metallic Single Atoms

2020 ◽  
Author(s):  
Weihong Lai ◽  
Heng Wang ◽  
Quan jiang ◽  
Zichao Yan ◽  
Hanwen Liu ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Structural Evolution ◽  
Charge Compensation ◽  
Catalytic Reactions ◽  
Single Atom ◽  
Carbon Surface ◽  
Hydrogen Electrode ◽  
Single Atoms ◽  
Mass Activity ◽  
Co Doped

<p>Herein, we develop a non-selective charge compensation strategy to prepare multi-single-atom doped carbon (MSAC) in which a sodium p-toluenesulfonate (PTS-Na) doped polypyrrole (S-PPy) polymer is designed to anchor discretionary mixtures of multiple metal cations, including iron (Fe<sup>3+</sup>), cobalt (Co<sup>3+</sup>), ruthenium (Ru<sup>3+</sup>), palladium (Pd<sup>2+</sup>), indium (In<sup>3+</sup>), iridium (Ir<sup>2+</sup>), and platinum (Pt<sup>2+</sup>) . As illustrated in Figure 1, the carbon surface can be tuned with different level of compositional complexities, including unary Pt<sub>1</sub>@NC, binary (MSAC-2, (PtFe)<sub>1</sub>@NC), ternary (MSAC-3, (PtFeIr)<sub>1</sub>@NC), quaternary (MSAC-4, (PtFeIrRu)<sub>1</sub>@NC), quinary (MSAC-5, (PtFeIrRuCo)<sub>1</sub>@NC), senary (MSAC-6, (PtFeIrRuCoPd)<sub>1</sub>@NC), and septenary (MSAC-7, (PtFeIrRuCoPdIn)<sub>1</sub>@NC) samples. The structural evolution of carbon surface dictates the activities of both ORR and HER. The senary MSAC-6 achieves the ORR mass activity of 18.1 A·mg<sub>metal</sub><sup>-1</sup> at 0.9 V (Vs reversible hydrogen electrode (RHE)) over 30K cycles, which is 164 times higher than that of commercial Pt/C. The quaternary MSAC-4 presented a comparable HER catalytic capability with that of Pt/C. These results indicate that the highly complexed carbon surface can enhance its ability over general electrochemical catalytic reactions. The mechanisms regarding of the ORR and HER activities of the alternated carbon surface are also theoretically and experimentally investigated in this work, showing that the synergistic effects amongst the co-doped atoms can activate or inactivate certain single-atom sites.</p>

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