Monopolar membrane-assisted acid-alkaline amphoteric water electrolysis towards efficient hydrogen generation

Song Xue, Ru Liu, Yadi Cheng, Sebastian Watzele, Xiangju Song, Mengke Liu, Yajing Zhang, Guanghu He, Oded Nir, Minghua Huang, Heqing Jiang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Monopolar membrane-assisted electrolyzers enable water electrolysis using acid-alkali asymmetric electrolytes. However, understanding how such an electrolyzer works remains a significant challenge. By assessing the concentration-polarization state in membranes, measuring the ion concentration change in electrolytes, and determining the corresponding transmembrane resistance, we reveal that this electrolyzer can prevent the negative effect of the water dissociation process. The electrolyzer functions by the chemical potential gradient between the asymmetric electrolytes. Briefly, the delta in pH between asymmetric electrolytes significantly modifies the reversible hydrogen electrode potential at both electrolyte compartments and electrodes, and therefore decreases the required external potential. Notably, the unavoidable ion diffusion slightly reduces this positive effect. The electrolyzer performance depends on the membrane property, working temperature, electrolyte compositions as well as electrocatalysts. When adopted with state-of-the-art electrocatalysts, this electrolyzer achieves an industrially relevant current density of 200 mA cm−2 at a cell voltage of only 1.39 V, outperforming most conventional water electrolyzers, and to the best of our knowledge also those fed by asymmetric electrolytes. Overall, this work highlights the promise of coupling chemical potential energy and electrical energy for hydrogen production, which provides a new strategy to lower the potential for driving water splitting.

Original languageEnglish
Article number232561
JournalJournal of Power Sources
Volume557
DOIs
StatePublished - 15 Feb 2023

Keywords

  • Asymmetric electrolytes
  • Cation-/Anion-exchange membranes
  • Chemical potential
  • Hydrogen production
  • Water electrolysis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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