This study reported a hierarchically ordered porous Ni-based cathode of a solid oxide electrolysis cell to realise stable CO₂ electrolysis without the need of safe gas. The Ni/(Y₂O₃)_0.08(ZrO₂)_0.92 (YSZ) cathode support has a microchannel structure, which enabled efficient catalyst delivery to the reaction zone between the cathode and the electrolyte and resulted in facilitated gas diffusion through straight channels instead of the tortuous pores intrinsic to conventional porous electrodes. A catalyst network covering a Ni/YSZ scaffold reduced electrode polarisation resistance, prevented carbon formation and suppressed Ni oxidation. The facilitated gas diffusion diminished or eliminated concentration polarisation and carbon formation due to CO accumulation in the reaction zone. The novel hierarchical structure enables stable CO₂ electrolysis over conventional Ni-based cathodes with low capital and operational costs.

中文翻译：

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分层排列的多孔镍基阴极支撑的固体氧化物电解槽，可在没有安全气体的情况下稳定地进行CO ₂电解

这项研究报告了固体氧化物电解槽的分层有序多孔镍基阴极，可在不需要安全气体的情况下实现稳定的CO ₂电解。Ni /（Y ₂ O ₃）_0.08（ZrO ₂）_0.92（YSZ）阴极载体具有微通道结构，能够将催化剂有效地输送到阴极和电解质之间的反应区，并导致气体通过直通道而不是常规多孔电极固有的曲折孔扩散。覆盖Ni / YSZ支架的催化剂网络降低了电极的极化电阻，防止了碳的形成并抑制了Ni的氧化。由于CO在反应区中的积累，促进的气体扩散减少或消除了浓度极化和碳的形成。新颖的分层结构能够以较低的投资和运营成本在传统的镍基阴极上实现稳定的CO ₂电解。