Relating Alkaline Stability to the Structure of Quaternary Phosphonium Cations

Hai Long, Bryan Pivovar, Bingzi Zhang, Robert Kaspar, Junhua Wang, Shuang Gu, Zhongbin Zhuang, Yushan Yan

Research output: Contribution to journalArticlepeer-review

12 Scopus Citations


Alkali-stable quaternary phosphonium (QP) is a type of cationic group for hydroxide exchange membranes (HEMs). To elucidate the relationship between structure and alkaline stability, we investigated the kinetics and degradation mechanism of a series of QP cations by both experiment and computation, and established a semi-empirical formula based on the Taft equation to directly estimate alkaline stability of QP cations from the 31P NMR chemical shift δ and the steric substituent constant Es, facilitating the search for QP cations with improved alkaline stability.

Original languageAmerican English
Pages (from-to)26640-26645
Number of pages6
JournalRSC Advances
Issue number47
StatePublished - 2018

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-2C00-72259


  • chemical shift
  • chemical stability
  • degradation
  • positive ions


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