Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (6): 1079-1086.DOI: 10.1016/S1872-2067(17)62820-1

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La1-xCaxMn1-yAlyO3 perovskites as efficient catalysts for two-step thermochemical water splitting in conjunction with exceptional hydrogen yields

Lulu Wanga, Mohammad Al-Mamuna, Porun Liua, Yun Wanga, Hua Gui Yangb, Huijun Zhaoa,c   

  1. a. Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD 4222, Australia;
    b. Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;
    c. Centre for Environmental and Energy Nanomaterials, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China
  • Received:2017-02-17 Revised:2017-03-19 Online:2017-06-18 Published:2017-06-08
  • Supported by:

    This work was supported by the Australian Research Council (FT120100913) and the National Natural Science Foundation of China (51372248, 51432009)

Abstract:

Solar-driven thermochemical water splitting represents one efficient route to the generation of H2 as a clean and renewable fuel. Due to their outstanding catalytic abilities and promising solar fuel production capacities, perovskite-type redox catalysts have attracted significant attention in this regard. In the present study, the perovskite series La1-xCaxMn1-yAlyO3 (x, y = 0.2, 0.4, 0.6, or 0.8) was fabricated using a modified Pechini method and comprehensively investigated to determine the applicability of these materials to solar H2 production via two-step thermochemical water splitting. The thermochemical redox behaviors of these perovskites were optimized by doping at either the A (Ca) or B (Al) sites over a broad range of substitution values, from 0.2 to 0.8. Through this doping, a highly efficient perovskite (La0.6Ca0.4Mn0.6Al0.4O3) was developed, which yielded a remarkable H2 production rate of 429 μmol/g during two-step thermochemical H2O splitting, going between 1400 and 1000 ℃. Moreover, the performance of the optimized perovskite was found to be eight times higher than that of the benchmark catalyst CeO2 under the same experimental conditions. Furthermore, these perovskites also showed impressive catalytic stability during two-step thermochemical cycling tests. These newly developed La1-xCaxMn1-yAlyO3 redox catalysts appear to have great potential for future practical applications in thermochemical solar fuel production.

Key words: Two-step thermochemical route, Water splitting, Solar fuel, Perovskite-type redox catalyst, Hydrogen production