Feng Desheng, Zhu Zhonghua, Li Dan, Li Mengran
Department of Chemical Engineering, the University of Melbourne, Melbourne, 3010, Australia.
School of Chemical Engineering, The University of Queensland, Brisbane, 4072, Australia.
Nanoscale. 2025 May 9;17(18):11133-11151. doi: 10.1039/d4nr05513f.
Protonic ceramic fuel cells offer a promising route to effectively generate electricity from various fuels at reduced temperatures. However, the viability of this technology is impeded by the sluggish kinetics of the oxygen reduction reaction at the cathode. Recently, triple ionic-electronic conductors have shown their promise as cathode materials with improved catalytic activity because of their enhanced mixed electron and ionic conductivities that can maximise the active sites for the reaction. This review examines the transport mechanism of holes, oxygen ions, and protons within triple ionic-electronic conductors. This review highlights the equilibrium among these charge carriers and their requirement for specific cationic environments to facilitate rapid transport. As a result, triple ionic-electronic conductors need to balance the transport of these charges to realise optimum oxygen reduction reaction activity. The review further identifies the transport of oxygen ions or protons as the current limiting factor in triple ionic-electronic conductors. This review concludes by emphasizing the importance of understanding the role of ionic transport in the oxygen reduction reaction to enhance the performance of triple ionic-electronic conductors.
质子陶瓷燃料电池为在较低温度下有效利用各种燃料发电提供了一条很有前景的途径。然而，该技术的可行性受到阴极氧还原反应动力学迟缓的阻碍。最近，三离子电子导体因其增强的混合电子和离子传导性而有望成为具有更高催化活性的阴极材料，这种传导性可以使反应的活性位点最大化。本综述研究了三离子电子导体中空穴、氧离子和质子的传输机制。本综述强调了这些电荷载流子之间的平衡以及它们对促进快速传输的特定阳离子环境的需求。因此，三离子电子导体需要平衡这些电荷的传输，以实现最佳的氧还原反应活性。该综述进一步确定了氧离子或质子的传输是三离子电子导体中的电流限制因素。本综述最后强调了理解离子传输在氧还原反应中的作用对于提高三离子电子导体性能的重要性。
