Chen Xi, Yu Na, Song Yufei, Liu Tong, Xu Hengyue, Guan Daqin, Li Zheng, Huang Wei-Hsiang, Shao Zongping, Ciucci Francesco, Ni Meng
Department of Building and Real Estate, Research Institute for Sustainable Urban Development (RISUD) and Research Institute for Smart Energy (RISE), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China.
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, 999077, China.
Adv Mater. 2024 Aug;36(32):e2403998. doi: 10.1002/adma.202403998. Epub 2024 Jun 4.
Reversible protonic ceramic electrochemical cells (R-PCECs) offer the potential for high-efficiency power generation and green hydrogen production at intermediate temperatures. However, the commercial viability of R-PCECs is hampered by the sluggish kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) within conventional air electrodes operating at reduced temperatures. To address this challenge, this work introduces a novel approach based on the simultaneous optimization of bulk-phase metal-oxygen bonds and in-situ formation of a metal oxide nano-catalyst surface modification. This strategy is designed to expedite the ORR/OER electrocatalytic activity of air electrodes exhibiting triple (O, H, e) conductivity. Specifically, this engineered air electrode nanocomposite-Ba(CoFeZrY)NiFO demonstrates remarkable ORR/OER catalytic activity and exceptional durability in R-PCECs. This is evidenced by significantly improved peak power density from 626 to 996 mW cm and highly stable reversibility over a 100-h cycling period. This research offers a rational design strategy to achieve high-performance R-PCEC air electrodes with superior operational activity and stability for efficient and sustainable energy conversion and storage.
可逆质子陶瓷电化学电池（R-PCECs）为中温下的高效发电和绿色制氢提供了潜力。然而，在低温运行的传统空气电极中，氧还原反应（ORR）和析氧反应（OER）的缓慢动力学阻碍了R-PCECs的商业可行性。为应对这一挑战，本工作引入了一种基于同时优化体相金属-氧键和原位形成金属氧化物纳米催化剂表面改性的新方法。该策略旨在加快具有三重（O、H、e）传导性的空气电极的ORR/OER电催化活性。具体而言，这种工程化的空气电极纳米复合材料-Ba(CoFeZrY)NiFO在R-PCECs中表现出显著的ORR/OER催化活性和出色的耐久性。这体现在峰值功率密度从626显著提高到996 mW/cm²，以及在100小时循环周期内具有高度稳定的可逆性。本研究提供了一种合理的设计策略，以实现具有卓越运行活性和稳定性的高性能R-PCEC空气电极，用于高效和可持续的能量转换与存储。
