Energy storage and hydrogen production by proton conducting solid oxide electrolysis cells with a novel heterogeneous design
Energy storage and hydrogen production by proton conducting solid oxide electrolysis cells with a novel heterogeneous design
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DOI：
10.1016/j.enconman.2020.113044
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发表时间：
2020-08-15
影响因子：
10.4
通讯作者：
Tao, Zetian
中科院分区：
文献类型：
--
作者：
Lei, Libin;Zhang, Jihao;Tao, Zetian
质子导电固体氧化物电解电池是一种很有前途的储能和制氢技术。然而，由于空气电极侧的恶劣潮湿条件，电解电池的稳定性仍然是一个问题。此外，在实际应用之前，能源效率还需要进一步提高。在这项工作中，考虑到稳定性和能量效率，提出了一种新的质子传导固体氧化物电解电池的异质设计。在这种异质设计中，既可以利用质子导电材料的优点，又可以同步规避质子导电材料的缺点，从而提高电解电池的稳定性和效率。在以钇锆共掺杂的铈钡-镍为燃料电极材料，掺杂钇锆酸钡为电解质材料的电解电池中，通过实验和模型验证了异质设计的可行性和优越性。实验结果表明，与传统的均匀设计相比，该设计能有效地提高掺钇锆酸钡电解质的质子电导率(在873 K时从0.88 × 10(-3) S cm（-1）提高到2.13 × 10(-3) S cm(-1))，并能略微提高电解质的离子输运数（在873 K时从0.941提高到0.964），从而获得更好的电化学性能。采用这种设计的电解电池也表现出良好的稳定性。仿真结果表明，该设计提高了电解电池的法拉第效率和能量效率。这些令人印象深刻的结果表明，异质设计是高性能高效质子传导固体氧化物电解电池的合理设计。
The proton-conducting solid oxide electrolysis cell is a promising technology for energy storage and hydrogen production. However, because of the aggressive humid condition in the air electrode side, the stability of electrolysis cells is still a concern. In addition, the energy efficiency needs further improvement before its practical application. In this work, considering both stability and energy efficiency, a novel heterogeneous design is proposed for proton-conducting solid oxide electrolysis cells. In this heterogeneous design, the merits of proton-conducting materials can be taken advantage of and the drawbacks of proton-conducting materials can be circumvented synchronously, resulting in better stability and higher efficiency of electrolysis cells. The feasibility and advantages of the heterogeneous design are demonstrated in electrolysis cells with yttrium and zirconium co-doped barium cerate-nickel as the fuel electrode material and yttrium-doped barium zirconate as the electrolyte material by experiment and modeling. The experimental results demonstrate that compared with the conventional homogeneous design, this novel design can efficiently improve the proton conductivity of the yttrium-doped barium zirconate electrolyte (from 0.88 x 10(-3) S cm(-1) to 2.13 x 10(-3) S cm(-1) at 873 K) and slightly improve the ionic transport number of the electrolyte (from 0.941 to 0.964 at 873 K), resulting in better electrochemical performance. The electrolysis cells with this design also show good stability. Moreover, the simulation results show that the faradaic efficiency and energy efficiency of electrolysis cells are improved by applying this novel design. These impressive results demonstrate that heterogeneous design is a rational design for high-performance and efficient proton-conducting solid oxide electrolysis cell.