| Author(s) |
Xingbo Liu, Cijie Liu, Dawei Zhang, Wei Li, Jamie Trindell, Keith King, Sean Bishop, Joshua Sugar, Anthony McDaniel, Andrew Smith, Peter Salinas, Eric Coker, Arielle Clauser, Joerg Neuefeind, Jingjing Yang, Hector De Santiago, Liang Ma, Yi Wang, Qiang Wang, Wenyuan Li, Qingsong Wang, Qingyuan Li, Hanchen Tian, Ha Ngoc Ngan Tran , Xuemei Li, Boyuan Xu, Brandon Robinson, Angela Deibel, Gregory Collins, Nhat Anh Thi Thieu , Jianli Hu, Yue Qi, Jian Luo |
| Abstract Scope |
High-entropy perovskite oxides (HEPO) have been studied as a new family of redox oxides for solar thermochemical hydrogen (STCH) production owing to their favorable thermodynamic properties. Here, we report a strategy of introducing A-site HEPO, (La1/6Pr1/6Nd1/6Gd1/6Sr1/6Ba1/6)MnO3 (LPNGSB_Mn), which shows desirable thermodynamic and kinetics properties, and excellent cycling durability. LPNGSB_Mn exhibits enhanced hydrogen production (~100 mmol moloxide–1) compared to LSM (~68) in 1-hour redox duration and high STCH and phase stability for 50 cycles. LPNGSB_Mn possesses moderate reduction enthalpy reduction (260–286 kJ (mol-O)−1), high reduction entropy (130–164 J (mol-O)−1 K–1), and fast surface oxygen exchange kinetics. All A-site cations do not show observable valence changes during the redox processes; however, STCH production correlates with the number of equimolarly mixed A-site elements. This research suggests a new A-site mixing strategy and a new class of A-site high-entropy perovskite oxides with a vast compositional space for tailoring properties for STCH. |