Uniform-dispersed ZnS quantum dots loading on graphene as a promising anode for potassium-ion batteries

Cai

et al. 2023

ACS Appl. Nano Mater.

The choice of SiO 2 precursor plays an important role in designing and synthesizing specific nanostructured Si materials with improved Li-storage performance. Herein, various SiO 2 precursors are used to prepare nanostructured Si spheres via zincothermic reduction and their effects on the reduction process are systematically investigated. It is found that the size and structure of SiO 2 precursors have a significant effect on the zincothermic reduction process. Among various precursors, nano-SiO 2 and bio-SiO 2 (e.g., SiO 2 derived from rice husk (RH-SiO 2 ) and bamboo leaves (BL-SiO 2 )) are successfully reduced to Si spheres, while crystalline bulk SiO 2 (i.e., micro-SiO 2 ) cannot be reduced. The ease of zincothermic reduction of nano-and bio-SiO 2 is due to the high surface area of SiO 2 that allows sufficient and facile chlorination−reduction reactions. In addition, the hollow Si spheres prepared from nano-SiO 2 , RH-SiO 2 , and BL-SiO 2 are used as anode materials for lithium-ion batteries, all of which exhibit good electrochemical performances, delivering the specific discharge capacities of 947.6, 1130.7, and 1050 mAh g −1 over 300 cycles at 1 A g −1 , respectively. Overall, this work offers a deeper understanding of zincothermic reduction and demonstrates the broad applicability of zincothermic reduction for the preparation of nanostructured Si from a variety of Si sources.

Section: Resultsmentioning

confidence: 99%

Preparation of Hollow Nanostructured Si Spheres by Zincothermic Reduction of SiO₂ to Si for Lithium-Ion Batteries

Cai

et al. 2023

ACS Appl. Nano Mater.

“…A comparison of the electrochemical performance is significant and necessary to understand the operating mechanism and predict performance limitations of different types of anode materials. Therefore, we compared each category of representative battery-type anode materials in terms of specific capacity, rate capability, cyclic stability, working voltage, ICE, and electrolyte (Figure and Table ) (see refs − , − , , , , , , , , , , , , , − , − , − , , , , , , , , − , , , , , , and − ). Specifically, non-carbon-based intercalation-, surface-capacitive–intercalation-, and organic-type anode materials are attractive for their good cycle stability because they undergo minor volume changes during the K + insertion/extraction processes .…”

Section: Discussionmentioning

confidence: 99%

Recent Advances and Perspectives of Battery-Type Anode Materials for Potassium Ion Storage

et al. 2021

Potassium ion energy storage devices are competitive candidates for grid-scale energy storage applications owing to the abundancy and cost-effectiveness of potassium (K) resources, the low standard redox potential of K/K+, and the high ionic conductivity in K-salt-containing electrolytes. However, the sluggish reaction dynamics and poor structural instability of battery-type anodes caused by the insertion/extraction of large K+ ions inhibit the full potential of K ion energy storage systems. Extensive efforts have been devoted to the exploration of promising anode materials. This Review begins with a brief introduction of the operation principles and performance indicators of typical K ion energy storage systems and significant advances in different types of battery-type anode materials, including intercalation-, mixed surface-capacitive-/intercalation-, conversion-, alloy-, mixed conversion-/alloy-, and organic-type materials. Subsequently, host–guest relationships are discussed in correlation with the electrochemical properties, underlying mechanisms, and critical issues faced by each type of anode material concerning their implementation in K ion energy storage systems. Several promising optimization strategies to improve the K+ storage performance are highlighted. Finally, perspectives on future trends are provided, which are aimed at accelerating the development of K ion energy storage systems.

“…Qi et al. [ 286 ] reported a morphology‐controllable ZnS QDs loading on graphene. The growth of QDs can mitigate the volume effect of the anode and shorten the migration path of K ions.…”

Section: Semiconducting Qds For Energy Storagementioning

confidence: 99%

“…To date, this field is still in its early stages of exploration, and only a few anode materials with QDs (e.g., metal chalcogenides) for PIBs have been reported. Qi et al [286] reported a morphology-controllable ZnS QDs loading on graphene. The growth of QDs can mitigate the volume effect of the anode and shorten the migration path of K ions.…”

Section: Alkali-metal Ion Batteriesmentioning

confidence: 99%

Semiconducting Quantum Dots for Energy Conversion and Storage

Huang

2023

Adv Funct Materials

Semiconducting quantum dots (QDs) have received huge attention for energy conversion and storage due to their unique characteristics, such as quantum size effect, multiple exciton generation effect, large surface‐to‐volume ratio, high density of active sites, and so on. However, the holistic and systematic understanding of the energy conversion and storage mechanism centering on QDs in specific application is still lacking. Herein, a comprehensive introduction of these extraordinary 0D materials, e.g., metal oxide, metal dichalcogenide, metal halides, multinary oxides, and nonmetal QDs, is presented. It starts with the synthetic strategies and unique properties of QDs. Highlights are focused on the rational design and development of advanced QDs‐based materials for the various applications in energy‐related fields, including photocatalytic H2 production, photocatalytic CO2 reduction, photocatalytic N2 reduction, electrocatalytic H2 evolution, electrocatalytic CO2 reduction, electrocatalytic N2 fixation, electrocatalytic O2 evolution, electrocatalytic O2 reduction, solar cells, metal‐ion batteries, lithium–sulfur batteries, metal–air batteries, and supercapacitors. At last, challenges and perspectives of semiconducting QDs for energy conversion and storage are detailedly proposed.