@article {1139,
	title = {Electrode optimization for efficient hydrogen production using an SO2-depolarized electrolysis cell},
	journal = {International Journal of Hydrogen Energy},
	volume = {47},
	year = {2022},
	pages = {14180-14185},
	abstract = {The hybrid sulfur (HyS) cycle offers an alternative route to hydrogen and sulfuric acid production using the SO2-depolarized electrolysis (SDE) cell. This work reports the most efficient SDE operation to date at high sulfuric acid concentrations (\~{}60~wt\%) achieved through the optimization of operating conditions and cell components. We observed that open porosity in the porous transport media (PTM) plays a significant role in SDE performance as it enables efficient acid removal from the catalyst layer. The combination of membrane electrode assembly (MEA) components, such as Sulfonated Diels Alder Poly (phenylene) (SDAPP) membranes and electrodes prepared using SGL 29BC PTM, and operating conditions (103.4 kPagauge at 125~{\textdegree}C) yielded electrolysis potentials <700~mV at 500~mA/cm2 and acid concentrations >60~wt\%.},
	keywords = {Catalysis, electrolysis, High pressure, Hybrid sulfur cycle, Hydrogen generation, Sulfur dioxide},
	issn = {0360-3199},
	doi = {https://doi.org/10.1016/j.ijhydene.2022.02.166},
	url = {https://www.sciencedirect.com/science/article/pii/S0360319922007807},
	author = {H{\'e}ctor R. Col{\'o}n-Mercado and Scott A. Mauger and Maximilian B. Gorensek and Cy H. Fujimoto and Aaron A. Lando and Prabhu Ganesan and Benjamin H. Meekins and Noah D. Meeks}
}
@article {1141,
	title = {High-performance SO2-depolarized electrolysis cell using advanced polymer electrolyte membranes},
	journal = {International Journal of Hydrogen Energy},
	volume = {47},
	year = {2022},
	pages = {57-68},
	abstract = {Three different proton conducting polymeric membrane materials (Nafion{\textregistered} 115, Nafion{\textregistered} 212, and sulfonated Diels-Alder polyphenylene [SDAPP]) were evaluated for use in SO2-depolarized electrolyzers for the production of hydrogen via the hybrid sulfur cycle. Their performance was measured using different water feed strategies to minimize overpotential losses while maintaining high product acid concentration. Both thin membranes (Nafion{\textregistered} 212 and SDAPP) showed performance superior to that of the thicker Nafion{\textregistered} 115. The SDAPP membrane electrode assembly (MEA) performed well at higher acid concentrations, maintaining low ohmic and kinetic overpotentials. Finally, short-term (100-h) stability tests under constant current conditions showed minimal degradation for the SDAPP and Nafion{\textregistered} 212 MEAs. SDAPP MEA performance approached the targets needed to make the hybrid sulfur cycle a competitive process for hydrogen production (product acid concentration >=65~wt\% H2SO4 at~<=~0.6-V cell potential and >=0.5 A-cm-2 current density).},
	keywords = {Hybrid sulfur (HyS) process, Hydrogen production, Sulfonated diels-alder polyphenylene (SDAPP), Sulfur dioxide-depolarized electrolyzer (SDE), Sulfuric acid production},
	issn = {0360-3199},
	doi = {https://doi.org/10.1016/j.ijhydene.2021.10.019},
	url = {https://www.sciencedirect.com/science/article/pii/S0360319921039343},
	author = {H{\'e}ctor R. Col{\'o}n-Mercado and Maximilian B. Gorensek and Cy H. Fujimoto and Aaron A. Lando and Benjamin H. Meekins}
}
