Influence of the electrolyte conductivity on the critical current density and the breakdown voltage  

作　　者：Hae-Kyun Park Dong-Hyuk Park Bum-Jin Chung 

机构地区：[1]Department of Nuclear Engineering Kyung Hee University,1732 Deogyeong-daero,Giheung-gu,Yongin-si,Gyeonggi-do 17104,Korea

出　　处：《Chinese Journal of Chemical Engineering》2023年第7期169-175,共7页中国化学工程学报（英文版）

基　　金：sponsored by the Korean Ministry of Science and ICT(MSIT);supported by nuclear Research&Development program grant funded by the National Research Foundation(NRF)(2021M2D1A1084838)。

摘　　要：The work investigates influence of the electrolyte conductivity on the onset of partial contact glow discharge electrolysis(CGDE)in a water electrolysis.Critical current density(CCD)and breakdown voltage were measured together with in situ observation of hydrogen bubble behavior,whose influence has not been focused on.For a fixed current during normal electrolysis,hydrogen coalescence adjacent to cathode surface was invigorated at a lower conductivity.Photographic analyses elucidated the hydrogen coalescence characteristics by quantifying size and population of detached hydrogen bubbles.The CCD increased about 104% within given range of conductivity(11.50-127.48 mS·cm^(-1))due to impaired bubble coalescence,which delays hydrogen film formation on the cathode.Meanwhile,decreasing trend of breakdown voltage was measured with increased conductivity showing maximum drop of 74%.It is concluded that onset of partial CGDE is directly affected by hydrodynamic bubble behaviors,whereas the electrolyte conductivity affects the bubble formation characteristics adjacent to cathode electrode.

关 键 词：Water electrolysis Critical current density Breakdown voltage Electrolyte conductivity Hydrogen bubble behavior 

分 类 号：TQ116.21[化学工程—无机化工]