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Heterogeneous Kinetics of Thiourea Electro‐Catalytic Oxidation Reactions on Palladium Surface in Aqueous Medium
Author(s) -
Shabik Md. Fazle,
Begum Humayra,
Rahman Mohammed M.,
Marwani Hadi M.,
Hasnat Mohammad A.
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202001016
Subject(s) - chemistry , cyclic voltammetry , catalysis , electrochemistry , thiourea , reaction rate constant , palladium , kinetics , adsorption , analytical chemistry (journal) , inorganic chemistry , charge transfer coefficient , catalytic oxidation , electrode potential , electrode , organic chemistry , physics , quantum mechanics
The electrochemical behaviors of thiourea (TU) oxidation have been studied at Palladium (Pd) electrode in the acidic medium by recording cyclic voltammograms (CVs). The influence of pH was investigated in the pH range of 1.0 to 9.0. Facilitated adsorption of TU on electrode surface results in enhanced catalytic response in acidic medium and maximum electro‐catalytic response was found at pH∼3.0. Chronoamperometric (CA) experiment determined this oxidation as 1e ‐ transfer process and the variation of TU concentration reveals a 1st order kinetics. In the CV responses, the large value of peak separation ( ▵E p >380 mV) calculated by the variation of scan rate indicates that oxidation of TU is an irreversible process. With the aid of convolution potential sweep voltammetry (CPSV), the standard rate constant ( k °) for the reaction was found to be 7.1×10 −4 cm/s and the formal potential constant ( E°′ ) was evaluated to be ∼0.37 V vs Ag/AgCl (sat. KCl). The value of transfer coefficient ( α ) was found to vary from 0.74 to 0.40 with applied potential ( E ). From the potential dependent variation of transfer coefficient ( α ) and activation energy (▵G ≠ ), it was concluded that the overall electrochemical oxidation of TU follows a stepwise mechanism at lower potential (<0.40) V and a concerted one at relatively higher potential (>0.40) V. The FTIR analysis of the product after oxidation of TU molecules confirmed the appearance of a new sharp band near 530 cm −1 due to the formation of S−S bonds suggesting formation of formamidine disulfide (FD) ions.