  In the global pursuit of sustainable energy solutions, mitigating carbon
dioxide (CO2) emissions stands as a pivotal challenge. With escalating
atmospheric CO2 levels, the imperative of direct air capture (DAC) systems
becomes evident. Simultaneously, green hydrogen (GH) emerges as a pivotal
medium for renewable energy. Nevertheless, the substantial expenses associated
with these technologies impede widespread adoption, primarily due to
significant installation costs and underutilized operational advantages when
deployed independently. Integration through sector coupling enhances system
efficiency and sustainability, while shared power sources and energy storage
devices offer additional economic benefits. In this study, we assess the
economic viability of polymer electrolyte membrane electrolyzers versus
alkaline electrolyzers within the context of sector coupling. Our findings
indicate that combining GH production with solid DAC systems yields significant
economic advantages, with approximately a 10% improvement for PEM electrolyzers
and a 20% enhancement for alkaline electrolyzers. These results highlight a
substantial opportunity to improve the efficiency and economic viability of
renewable energy and green hydrogen initiatives, thereby facilitating the
broader adoption of cleaner technologies.
