Robust Anode‐Supported Cells with Fast Oxygen Release Channels for Efficient and Stable CO2 Electrolysis at Ultrahigh Current Densities

• DOI: 10.1002/smll.202007211
• Publication Date: 2021-01-20T14:15:08Z
• Authors: Tianpei Li; Tengpeng Wang; Tao Wei; Xun Hu; Zhengmao Ye; Zhi Wang; Dehua Dong; Bin Chen; Huanting Wang; Zongping Shao
• Keywords: Oxygen evolution

Abstract High‐temperature electrolysis using solid oxide cells (SOECs) provides a promising way for the storage of renewable energy into chemical fuels. During past, nickel‐based cathode‐supported thin‐film electrolyte configuration was widely adopted. However, such suffer from serious challenge anode delamination at high currents due to enormous gaseous oxygen formation anode‐electrolyte interface with insufficient adhesion caused by low sintering temperatures ensuring porosity and cathode pulverization because potential nickel redox reaction. Here, authors propose, fabricate, test asymmetric thick anode‐supported SOECs firm graded gas diffusion channel realizing efficient stable ultrahigh currents. Such specially structured allows co‐sintering support form strong while suppressing sintering. The mixed oxygen‐ion electron conducting structure fast release pathway, large surface evolution reaction, excellent depositing nanocatalysts, further improve activity. As result, as‐prepared demonstrate both performance, comparable or even higher than state‐of‐the‐art SOECs, outstanding stability record current density 2.5 A cm −2 .