Asset Details
Do you wish to reserve the book?
KxCy phase induced expanded interlayer in ultra‐thin carbon toward full potassium‐ion capacitors
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
KxCy phase induced expanded interlayer in ultra‐thin carbon toward full potassium‐ion capacitors
Do you wish to request the book?
KxCy phase induced expanded interlayer in ultra‐thin carbon toward full potassium‐ion capacitors
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
KxCy phase induced expanded interlayer in ultra‐thin carbon toward full potassium‐ion capacitors
2022
Overview
Carbonaceous materials have been regarded as highly promising anode candidates for potassium storage with their cost‐effectiveness and environmental benignity. However, low specific capacity and difficulty in large‐scale synthesis largely hinder their further development. Herein, a thermal‐induced potassium–carbon alloy phase (KxCy) with the expanded interlayer spacing strategy is first put forward. Through in situ high‐temperature X‐ray diffraction, a K2C2 phase is evoked by thermal energy during the in‐situ carbonization process of carbon quantum dots intermediate derived from potassium‐containing precursors, whereas no lithium or sodium–carbon alloy phase is observed from lithium/sodium‐containing precursors. The as‐obtained ultra‐thin carbon nanosheets achieve adjustable layer spacing, preparation in bulk, delivering reversible potassium storage of 403.4 mAh g−1 at 100 mA g−1 and 161.2 mAh g−1 even at 5.0 A g−1, which is one of the most impressive K‐storage performances reported so far with great potential application. Furthermore, the assembled potassium‐ion hybrid capacitor by combining the impressive CFMs‐900 anode with the three‐dimensional framework‐activated carbon delivers a high energy‐power density of 251.7 Wh kg−1 at 250 W kg−1 with long‐term stability. This study opens a scalable avenue to realize the expanded interlayer spacing, which can be extended to other multicarboxyl potassium salts and can provide approach for the design of high‐performance carbon anode materials for potassium storage.
A thermal‐induced KxCy with an expanded interlayer spacing strategy is first proposed in this manuscript, which enables highly reversible potassium‐storage capability with superior long‐term cycling stability. In situ high‐temperature X‐ray diffraction and high‐resolution transmission electron microscopy techniques have been utilized to demonstrate the existence of the K2C2 phase and the evoked carbon expanded interlayer, which successfully validates the feasibility of the offered strategy.
