SnO 2 Quantum Dots: Rational Design to Achieve Highly Reversible Conversion Reaction and Stable Capacities for Lithium and Sodium Storage

Small ◽  
2020 ◽  
Vol 16 (26) ◽  
pp. 2000681 ◽  
Author(s):  
Yong Cheng ◽  
Shaohua Wang ◽  
Lin Zhou ◽  
Limin Chang ◽  
Wanqiang Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rational Design ◽  
Conversion Reaction ◽  
Sodium Storage

Integrating SnS2 Quantum Dots with Nitrogen-Doped Ti3C2Tx MXene Nanosheets for Robust Sodium Storage Performance

2021 ◽  
Vol 4 (1) ◽  
pp. 846-854
Author(s):  
Jianfeng Ding ◽  
Cheng Tang ◽  
Guanjia Zhu ◽  
Weiwei Sun ◽  
Aijun Du ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Doped ◽  
Storage Performance ◽  
Sodium Storage

In situ SAXS probing the evolution of the precursors and onset of nucleation of ZnSe colloidal semiconductor quantum dots

2020 ◽  
Vol 56 (13) ◽  
pp. 2031-2034 ◽  
Author(s):  
Xiaoyu Hao ◽  
Meng Chen ◽  
LinXi Wang ◽  
Zhaopeng Cao ◽  
Yan Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Semiconductor Quantum Dots ◽  
Conversion Reaction ◽  
Colloidal Semiconductor ◽  
Nucleation Growth

The effect of diphenyl phosphine (HPPh2) on precursors conversion reaction and nucleation/growth of quantum dots (QDs) were in situ investigated by the combination of SAXS and UV-vis.

scholarly journals Nanostructured Electrode Enabling Fast and Fullyreversible MnO2-to-Mn2+ Conversion in Mild Buffered Aqueous Electrolytes

2020 ◽  
Author(s):  
Mickaël Mateos ◽  
Kenneth D. Harris ◽  
Benoit Limoges ◽  
Véronique Balland
Keyword(s):  
Rational Design ◽  
Coulombic Efficiency ◽  
Low Cost ◽  
Active Material ◽  
Rate Capability ◽  
Conversion Reaction ◽  
Design And Optimization ◽  
Aqueous Conditions ◽  
Comprehensive Framework ◽  
Aqueous Batteries

On account of their low-cost, earth abundance, eco-sustainability, and high theoretical charge storage capacity, MnO<sub>2</sub> cathodes have attracted a renewed interest in the development of rechargeable aqueous batteries. However, they currently suffer from limited gravimetric capacities when operating under the preferred mild aqueous conditions, which leads to lower performance as compared to similar devices operating in strongly acidic or basic conditions. Here, we demonstrate how to overcome this limitation by combining a well-defined 3D nanostructured conductive electrode, which ensures an efficient reversible MnO<sub>2</sub>-to-Mn<sup>2+</sup> conversion reaction, with a mild acid buffered electrolyte (pH 5). A reversible gravimetric capacity of 560 mA·h·g<sup>-1</sup> (close to the maximal theoretical capacity of 574 mA·h·g<sup>-1</sup> estimated from the MnO<sub>2</sub> average oxidation state of 3.86) was obtained over rates ranging from 1 to 10 A·g<sup>-1</sup>. The rate capability was also remarkable, demonstrating a capacity retention of 435 mA·h·g<sup>-1</sup> at a rate of 110 A·g<sup>-1</sup>. These good performances have been attributed to optimal regulation of the mass transport and electronic transfer between the three process actors, <i>i.e.</i> the 3D conductive scaffold, the MnO<sub>2</sub> active material filling it, and the soluble species involved in the reversible conversion reaction. Additionally, the high reversibility and cycling stability of this conversion reaction is demonstrated over 900 cycles with a Coulombic efficiency > 99.4 % at a rate of 44 A·g<sup>-1</sup>. Besides these good performances, also demonstrated in a Zn/MnO<sub>2</sub> cell configuration, we discuss the key parameters governing the efficiency of the MnO<sub>2</sub>-to-Mn<sup>2+</sup> conversion. Overall, the present study provides a comprehensive framework for the rational design and optimization of MnO<sub>2</sub> cathodes involved in rechargeable mild aqueous batteries.

Boosting sodium storage of mesoporous TiO2 nanostructure regulated by carbon quantum dots

2020 ◽  
Vol 31 (3) ◽  
pp. 897-902 ◽  
Author(s):  
Minghong Wu ◽  
Yanping Gao ◽  
Yu Hu ◽  
Bing Zhao ◽  
Haijiao Zhang
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Mesoporous Tio2 ◽  
Sodium Storage ◽  
Tio2 Nanostructure

scholarly journals III–V colloidal nanocrystals: control of covalent surfaces

2020 ◽  
Vol 11 (4) ◽  
pp. 913-922 ◽  
Author(s):  
Youngsik Kim ◽  
Jun Hyuk Chang ◽  
Hyekyoung Choi ◽  
Yong-Hyun Kim ◽  
Wan Ki Bae ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Energy ◽  
Surface Structure ◽  
Rational Design ◽  
Energy Levels ◽  
Colloidal Quantum Dots ◽  
Colloidal Nanocrystals ◽  
Energy Trap

Unveiling the atomistic surface structure of colloidal quantum dots may provide the route to rational design of highly performing III–V nanocrystals with control over energy levels position, surface energy, trap passivation, and heterojunction interface.

N-graphene motivated SnO2@SnS2 heterostructure quantum dots for high performance lithium/sodium storage

2019 ◽  
Vol 20 ◽  
pp. 225-233 ◽  
Author(s):  
Shifei Huang ◽  
Miao Wang ◽  
Peng Jia ◽  
Bo Wang ◽  
Jiujun Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Sodium Storage

Redox properties of CdSe and CdSe–ZnS quantum dots in solution

2010 ◽  
Vol 83 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Matteo Amelia ◽  
Tommaso Avellini ◽  
Simone Monaco ◽  
Stefania Impellizzeri ◽  
Ibrahim Yildiz ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photoinduced Electron Transfer ◽  
Rational Design ◽  
Redox Properties ◽  
Inorganic Nanoparticles ◽  
Structural Factors ◽  
Redox Potentials ◽  
Active Components ◽  
Cdse Core ◽  
Size Dependent

Semiconductor quantum dots (QDs) are inorganic nanoparticles which, because of their unique size-dependent electronic properties, are of high potential interest for the construction of functional nanodevices. Photoinduced electron transfer is a versatile mechanism used to implement light-induced functionalities in multicomponent (supra)molecular assemblies. Indeed, QDs can be employed as active components in new generations of these systems. The rational design of the latter, however, requires prior knowledge of the photo-physical properties and redox potentials of the nanocrystals. Here we discuss the results of recent systematic electrochemical investigations aimed at understanding the structural factors that regulate the redox properties of CdSe core and CdSe–ZnS core–shell QDs.

Sign in / Sign up

Export Citation Format

Share Document