8777
Sponge - like porous Ni ( OH ) ( 2 ) - NiF ( 2 ) composite ( PNC ) film was successfully synthesized by the anodization of nickel in a NH ( 4 ) F and H ( 3 ) PO ( 4 ) containing electrolyte .
 Ni ( OH ) ( 2 ), NiF ( 2 ), nickel, NH ( 4 ) F, H ( 3 ) PO ( 4 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ni ( OH ) ( 2 ), NiF ( 2 ), nickel, NH ( 4 ) F, H ( 3 ) PO ( 4 )