<li><b>Proton exchange membrane fuel cells (PEMFCs):</b> These are the most common type of fuel cell used in automotive applications. They operate at relatively low temperatures (around 80В°C) and have high power density.</li>
<h2>Challenges and Obstacles</h2>
<p>Developing the infrastructure to support water-powered vehicles would be a significant undertaking. This would involve establishing hydrogen production facilities, distribution networks, and refueling stations. The cost of building such infrastructure would be substantial.</p>
