Revealing molecular-level surface redox sites of controllably oxidized black phosphorus nanosheets

Title
Revealing molecular-level surface redox sites of controllably oxidized black phosphorus nanosheets
Authors
황준연이원기Puritu NakhanivejXu Yu박슬기김수홍진용김해진양지윤Chris WolvertonJing KongManish Chhowalla박호석
Keywords
Black phosphorus
Issue Date
2019-02
Publisher
Nature materials
Citation
VOL 18-162
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/69064
ISSN
1476-1122
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KIST Publication > Article
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