Fully anhydrous HCl electrolysis using polybenzimidazole membranes

Likit-anurak, Kris; White, Rosemary E.; Murdock, Laura; Benicewicz, Brian C.; Shimpalee, Sirivatch; Meekins, Benjamin H.

doi:10.1016/j.ijhydene.2022.06.039

Cited by 5 publications

(10 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In an acidic environment, the membrane area-specific resistance (ASR) of Nafion increases with increasing acid concentration . Para-PBI membranes, on the other hand, are known to exhibit decreasing membrane resistance with increasing cell temperature, even in the presence of high acid concentration. , The temperature in this study was limited to 50 °C to avoid acid evaporation and issues with material corrosion.…”

Section: Resultsmentioning

confidence: 99%

“…PBI membranes are high-temperature PEMs which have high acid resistance and require no external humidity to conduct protons. We previously demonstrated direct electrolysis of anhydrous HCl with single pass conversion of ≥90% . Stability of the para-PBI membrane was confirmed by a particularly harsh experimentautoclaving the membrane at ∼150 °C for 2 weeks in the presence of both HCl and Cl 2 .…”

Section: Introductionmentioning

confidence: 95%

“…We previously demonstrated direct electrolysis of anhydrous HCl with single pass conversion of ≥90%. 28 Stability of the para-PBI membrane was confirmed by a particularly harsh experi-ment�autoclaving the membrane at ∼150 °C for 2 weeks in the presence of both HCl and Cl 2 . Postexperiment characterization found that the physical properties of the membrane were unchanged, demonstrating the resilience of the para-PBI membrane against chemical dissolution.…”

Section: ■ Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Polybenzimidazole Membranes as Nafion Replacement in Aqueous HCl Electrolyzers

Likit-anurak

Karki

Howard

et al. 2023

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

We demonstrate the use of para-polybenzimidazole (PBI) membranes as replacements for Nafion membranes in aqueous HCl oxygen-depolarized electrolyzers. Both para-PBI and densified para-PBI membranes reduce the cell voltage needed at 0.5 A cm–2 by ≥100 mV. We examine the effect of HCl(aq) flow rate, back-pressure, electrolyzer temperature, and, for the densified para-PBI membranes, H3PO4 swell time on electrolyzer performance. Increased proton conductivity, measured as reduced area-specific membrane resistance, is identified as the primary mechanism to explain the improved performance of the electrolyzer.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: ■ Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Polybenzimidazole Membranes as Nafion Replacement in Aqueous HCl Electrolyzers

Likit-anurak

Karki

Howard

et al. 2023

ACS Appl. Energy Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…107,108 Theoretically, feeding gaseous HCl could improve the throughput and enhance electrolyzer performance by reducing mass diffusion constraints. 17 However, there were concerns with corrosion and post-process separation. In addition, Nafion membranes require to be hydrated to retain their proton conductivity, making a wholly anhydrous system up until this point practically unachievable.…”

Section: Advances In Cer-orr Coupled Hcl Electrolysismentioning

confidence: 99%

“…In order to tackle with both the issues, i.e., recycling of waste industrial HCl as well as cost-effective large scale production of chlorine, the most viable and greener approach could be HCl electrolysis. [17][18][19] The recycling of chlorine from HCl via the electrochemical approach was explored long ago at the industrial level since 1960s with the development of the Bayer-Uhde-Hochst process utilizing aqueous HCl as a reactor feed. 11 But this process has certain problems associated with it.…”

Section: Introductionmentioning

confidence: 99%