( ( ( ( Electrochemical ( redox reactions ) ) , ) ( Half ( cell reactions ) ) ) . )
(ROOT (NP (NP (NNP Electrochemical) (NN redox) (NNS reactions)) (, ,) (NP (NN Half) (NN cell) (NNS reactions)) (. .)))
Electrochemical redox reactions, Half cell reactions.
(ROOT (S (NP (DT A) (JJ voltaic) (NN cell)) (VP (VBZ generates) (NP (DT an) (JJ electric) (NN current)) (PP (IN through) (NP (NP (DT a) (NN reaction)) (VP (VBN known) (PP (IN as) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (JJ spontaneous) (NN redox))))))) (. .)))