In a collaborative effort between researchers from the China–UK Low Carbon College at Shanghai Jiao Tong University, the Energy Institute at University College London, and the School of Mechanical Engineering at Shanghai Jiao Tong University, a groundbreaking study has introduced an innovative solid oxide fuel cell (SOFC) system powered by ammonia (NH3) for all-electric ships. Published in Frontiers in Energy, the research aims to revolutionize ship propulsion by offering a highly efficient and environmentally friendly approach to address the pressing need for decarbonization in the shipping industry. The study focuses on the technical challenges of NH3 fuel SOFC ship power systems, such as slow hydrogen production, low efficiency, and limited space. To overcome these obstacles, the researchers developed a ribbed catalytic-combustion integrated ammonia cracker (IAC) that enables rapid hydrogen production, essential for efficient NH3 decomposition into high-concentration H2. The system's design ensures adaptability to various sailing conditions and has been validated through a 2 kW prototype experimental rig. With a target ship in mind, the NH3-fueled SOFC system boasts a rated power of 96 kW and an outstanding electrical efficiency of 60.13%, meeting the requirements for rated cruising conditions. The IAC, measuring 1.1 meters in length, achieves complete NH3 decomposition within a mere 2.94 seconds, marking significant reductions in cracking time and required cabin space. By adjusting the circulation ratio (CR) and ammonia-oxygen ratio (A/O) under high-load voyage conditions, the system's efficiency can be further optimized. Experimental results demonstrate the system's efficiency, with NH3 cracking H2 reaching 100% at 656 °C, producing 2.045 kW of power with an efficiency of approximately 58.66%. The low noise level of 58.6 dB and near-zero concentrations of CO2, NO, and SO2 in the flue gas underscore the minimal environmental impact of the system. This research not only signifies a technical milestone in NH3-fueled SOFC power systems for ships but also plays a crucial role in supporting the shipping industry's shift towards sustainable, clean energy solutions. The findings hold the potential to significantly reduce ocean carbon emissions, in line with global initiatives to combat climate change. With its innovative IAC and efficient SOFC system, this technology paves the way for a greener, decarbonized future in shipping.