氧化还原
假电容
磷
石墨烯
材料科学
化学工程
电容
无机化学
黑磷
电极
化学
纳米技术
超级电容器
物理化学
光电子学
冶金
工程类
作者
Puritut Nakhanivej,Xu Yu,Sul Ki Park,Soo Jeong Kim,Jin‐Yong Hong,Hae Jin Kim,Wonki Lee,Jun Yeon Hwang,Ji Ho Yang,Christopher Wolverton,Jing Kong,Manish Chhowalla,Ho Seok Park
出处
期刊:Nature Materials
[Springer Nature]
日期:2018-12-10
卷期号:18 (2): 156-162
被引量:207
标识
DOI:10.1038/s41563-018-0230-2
摘要
Bulk and two-dimensional black phosphorus are considered to be promising battery materials due to their high theoretical capacities of 2,600 mAh g−1. However, their rate and cycling capabilities are limited by the intrinsic (de-)alloying mechanism. Here, we demonstrate a unique surface redox molecular-level mechanism of P sites on oxidized black phosphorus nanosheets that are strongly coupled with graphene via strong interlayer bonding. These redox-active sites of the oxidized black phosphorus are confined at the amorphorized heterointerface, revealing truly reversible pseudocapacitance (99% of total stored charge at 2,000 mV s−1). Moreover, oxidized black-phosphorus-based electrodes exhibit a capacitance of 478 F g–1 (four times greater than black phosphorus) with a rate capability of ~72% (compared to 21.2% for black phosphorus) and retention of ~91% over 50,000 cycles. In situ spectroelectrochemical and theoretical analyses reveal a reversible change in the surface electronic structure and chemical environment of the surface-exposed P redox sites. Black phosphorus is being considered for energy storage but its rate and cycling capabilities are limited by intrinsic (de-)alloying. Molecular-level surface redox sites on oxidized black phosphorus can now be coupled with graphene via strong interlayer bonding.
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