Neutralization Short-Circuiting with Weak Electrolytes Erodes the Efficiency of Bipolar Membranes
Journal Article
·
· ACS Applied Materials and Interfaces
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Massachusetts Institute of Technology
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Bipolar membranes (BPMs) are critical components of a variety of electrochemical energy technologies. Many electrochemical applications require the use of buffers to maintain stable, nonextreme pH environments, yet the impact of buffers or weak acids/bases on the electrochemical behavior of BPMs remains poorly understood. Here, our data for a cell containing weak electrolytes is consistent with internal pH gradients within the anion exchange membrane (AEM) or cation exchange membrane (CEM) component of the BPM that form via ionic short-circuiting processes at open-circuit. Short-circuiting results from the coupling of co-ion crossover and parasitic neutralization and leads to buffering of the bipolar interface. This phenomenon, which we term neutralization short-circuiting, serves to erode BPM efficiency by attenuating the open-circuit membrane voltage and introducing parasitic reverse bias currents associated with weak acid/base dissociation at the interface. These findings establish a mechanistic basis for the operation of BPM cells in the presence of weak acid/base electrolytes.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0021634
- OSTI ID:
- 1908675
- Alternate ID(s):
- OSTI ID: 1922035
- Journal Information:
- ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 3 Vol. 15; ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
acid and base chemistry
bipolar membranes
buffers
co-ion crossover
dissociation
electrolytes
ionic short-circuiting
membranes
neutralization short-circuiting
pH
parasitic neutralization
reverse bias polarization
weak acids/bases
weak electrolytes
acid and base chemistry
bipolar membranes
buffers
co-ion crossover
dissociation
electrolytes
ionic short-circuiting
membranes
neutralization short-circuiting
pH
parasitic neutralization
reverse bias polarization
weak acids/bases
weak electrolytes