8463
Functioning , ring-shaped EDLC devices were manufactured in a single , multi-material operation comprising symmetric activated carbon electrodes in a 1Μ potassium hydroxide ( KOH ) electrolyte hydrogel .
 manufactured, multi-material, carbon, hydroxide, electrolyte
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 manufactured, multi-material, carbon, hydroxide, electrolyte