Phosphorous is a mysterious element that has different allotropes. white phosphorus, red phosphorus, black phosphorus, and a less significant violet phosphorous. Black phosphorus is the thermodynamically stable allotrope of phosphorous under ambient conditions. What is interesting about BP is that it has a layered structure and therefore it can be exfoliated into 2D monolayers that resemble graphene structure.
Amin Rabei Baboukani and his co-workers developed an interesting approach for large scale production of 2D BP. They have used bipolar electrochemistry, by applying a high voltage to generate electrochemical reactions between two feeding electrodes while a conductive bipolar electrode is placed between them. The difference in the electric potential between the solution and the bipolar electrode drives the redox reactions on the cathodic and anodic poles.
The exfoliated BP structure resulting from this method is monolayer and the sheets show low defect concentrations. While this methodology opens up a new window for different applications, here Mr. Rabei Baboukani and co-workers have used the 2D BP monolayers for high-performance energy storage applications. Based on their experiments the capacitance of their 2D BP monolayers is superior to most of the 2D materials-based devices such as MXene, 2D MnO2, graphene or graphene oxide
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