A General Electrodeposition Strategy for Fabricating Ultrathin Nickel Cobalt Phosphate Nanosheets with Ultrahigh Capacity and Rate Performance
| Autor: | Yazhou Xu, Jun Huang, Licheng Tan, Yushuai Xiong, Yiwang Chen, Li Wang, Lingfang Chen, Kai Yuan, Zhongyou Peng |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Supercapacitor
Materials science Fabrication General Engineering General Physics and Astronomy Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst Electrochemistry Phosphate 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Electrode General Materials Science 0210 nano-technology Cobalt phosphate Nanosheet |
| Zdroj: | ACS Nano. 14:14201-14211 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.0c07326 |
| Popis: | Transition-metal phosphates/phosphides possess promising theoretical electrochemical characteristics and exhibit great potential in advanced supercapacitors. Unfortunately, limited by the processing techniques and overall structure, their specific capacity and rate performance are still unsatisfactory. Herein, we report the fabrication of transition-metal phosphate electrodes with an ultrathin sheetlike array structure by one-step electrodeposition at room temperature. As a proof-of-concept, a transition-metal phosphate member of NiCo(HPO4)2·3H2O with an ultrathin nanosheet structure (thickness ∼2.3 nm) was synthesized and investigated. The as-prepared NiCo(HPO4)2·3H2O electrode showcases an ultrahigh specific capacity of 1768.5 C g-1 at 2 A g-1 (the highest value for transition-metal phosphates/phosphides reported to date), superb rate performance of 1144.8 C g-1 at 100 A g-1, and excellent electrochemical stability. Moreover, the transition-metal phosphate nanosheet array can be uniformly deposited on various conductive substrates, demonstrating the generality of our strategy. Therefore, this simple electrodeposition strategy provides an opportunity to fabricate ultrathin transition-metal phosphate nanosheet materials that can be used for energy storage/conversion, electrocatalysis, and other electrochemical energy-related devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|