( ( Different catalysts ) ( ( ( ( require ( unequal overpotential ) ) ( for ( this ( reduction reaction ) ) ) ) ( to ( take place ) ) ) . ) )
(ROOT (S (NP (JJ Different) (NNS catalysts)) (VP (VBP require) (NP (JJ unequal) (NN overpotential)) (PP (IN for) (NP (DT this) (NN reduction) (NN reaction))) (S (VP (TO to) (VP (VB take) (NP (NN place)))))) (. .)))
Different catalysts require unequal overpotential for this reduction reaction to take place.
(ROOT (S (NP (NP (DT The) (NN difference)) (PP (IN between) (NP (NP (DT the) (JJ theoretical) (JJ half-reaction) (NN reduction) (NN potential)) (CC and) (NP (NP (DT the) (JJ actual) (NN voltage)) (VP (VBN required)))))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ overpotential))))) (. .)))