Direct carbon solid oxide fuel cells (DC-SOFCs) are recognized as an efficient energy conversion device. With regard to their operation mechanism, the reverse Boudouard reaction rate is the crucial factor influencing cell performance. In this work, a new-type catalyst derived from industrial barium slag (BS) was first developed to enhance the reverse Boudouard reaction and DC-SOFC performance. The chemical composition and micro-morphologies of BS and barium slag-derived catalyst (BSC) were characterized in detail. The superiorities of BS and BSC were reflected in the enhanced DC-SOFC performance and high fuel utilization. The single cell fueled by BSC-loaded carbon yielded the best output of 249 mW cm⁻² at 850 °C. This result was comparable to the 266 mW cm⁻² output of a hydrogen-fueled SOFC due to the superior catalytic activity of metallic catalysts toward carbon gasification. The advantage of the BSC was also observed in the durable operation of the corresponding DC-SOFCs, which lasted for 36.2 h at 50 mA with the fuel utilization of 29.0%. This work provides a new channel for green and efficient utilization of BS and other industrial residues, and a novel option to the development of energy conversion technology.

直接碳固体氧化物燃料电池（DC-SOFCs）被认为是一种高效的能量转换装置。就其运行机理而言，反向布杜尔反应速率是影响电池性能的关键因素。在这项工作中，首次开发了一种源自工业钡渣 (BS) 的新型催化剂，以增强反向 Boudouard 反应和 DC-SOFC 性能。详细表征了BS和钡渣衍生催化剂（BSC）的化学成分和微观形貌。BS和BSC的优势体现在增强的DC-SOFC性能和高燃料利用率上。由负载 BSC 的碳提供燃料的单电池 在 850°C 下产生了 249 mW cm ^-2的最佳输出。该结果与 266 mW cm ^-2由于金属催化剂对碳气化具有优异的催化活性，因此可以输出以氢为燃料的 SOFC。BSC 的优势还体现在相应 DC-SOFC 的持久运行中，在 50 mA 下可持续运行 36.2 小时，燃料利用率为 29.0%。该工作为BS等工业残留物的绿色高效利用提供了新的途径，为能源转换技术的发展提供了新的选择。