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Based on these , a general model using the slit / cylindrical NL - DFT approach is proposed for the estimation of the specific capacitance of sp ( 2 ) carbon materials , which offers a simple but reliable method to predict the capacitance performance of these materials , thus speeding up the design and screening of the materials for high - performance supercapacitor and other surface area related devices .
 Chemical: carbon
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: carbon