화학공학소재연구정보센터
Journal of the Electrochemical Society, Vol.166, No.8, G61-G66, 2019
Observation of Bis-(3-sulfopropyl) Disulfide (SPS) Breakdown at the Cu Cathode and Insoluble Anode under Open-Circuit, Unpowered Closed-Circuit, and Electrolysis Conditions
Understanding additive breakdowns under operating conditions is highly needed for designing robust, high-efficiency Cu electroplating systems. In this study, the decomposition of bis-(3-sulfopropyl) disulfide (SPS) was examined in the membrane electroplating cell where the cathode and anode are separated. With an open circuit, the SPS was split into Cu(I) MPS- at the cathode via the chemical reaction with Cu+, followed by oxidation to 1,3-propane disulfonate (PDS). No chemical reactions take place at the insoluble anode. With an unpowered closed-circuit, SPS at the cathode and the insoluble anode were simultaneously broken down at an equal rate because of the formation of Cu+ at the anode by a galvanic proportionate reaction. With current flowing, SPS in the catholyte was consumed via the reaction with Cu+ as well as by incorporation, while that in the anolyte was decomposed via anodic oxidation. (C) 2019 The Electrochemical Society.