Autonomous Underwater Vehicles are very valuable tools in a great variety of marine related sectors that demand new capacities and improvements. These improvements go through increasing their endurance and, in this sense, the use of Direct Methanol Fuel Cells can be very interesting with an adequate CO₂ Treatment Method. This work investigates four CO₂ Treatment Methods for their application onboard Autonomous Underwater Vehicles powered by a Direct Methanol Fuel Cell-based power plant. The evaluation was carried out considering different working conditions defined by the fuel cell power, navigation depth and endurance. To rank the treatment methods, three Multi Criteria Decision Methods and eight selection criteria were used. The results show that direct disposal of CO₂ ejecting it outside the Autonomous Underwater Vehicle is the most adequate method for navigation depths up to 50 m. For deeper waters CO₂ storage embedded in an adsorbent material and CO₂ stored as a pressurized gas seem to be the best choices. In all cases, the results present a good stability against changes in the criteria weights vector.

在需要新能力和改进的各种海洋相关部门中，自主水下航行器是非常有价值的工具。这些改进是通过提高它们的耐用性来实现的，从这个意义上说，通过适当的 CO ₂处理方法使用直接甲醇燃料电池会非常有趣。这项工作调查了四种 CO ₂处理方法，它们在由直接甲醇燃料电池为基础的发电厂提供动力的自主水下航行器上的应用。评估是在考虑由燃料电池功率、导航深度和续航力定义的不同工作条件下进行的。为了对治疗方法进行排序，使用了三种多标准决策方法和八种选择标准。结果表明，直接处置 CO ₂将其喷射到自主水下航行器外是最适合导航深度达 50 m 的方法。对于较深水域CO ₂存储嵌入的吸附材料和CO ₂存储为加压气体似乎是最好的选择。在所有情况下，结果都表现出对标准权重向量变化的良好稳定性。