近日，瑞士洛桑联邦理工学院Xile Hu团队揭示了封装钴镍合金促进高温二氧化碳电还原。2025年5月14日出版的《自然》杂志发表了这项最新研究成果。

电化学将二氧化碳还原为化学品和燃料，为可再生能源储存和碳回收带来了巨大的前景。尽管固体氧化物电解槽中的高温CO₂电还原在工业上具有相关性，但目前的催化剂在高电流密度下的能效适中，寿命有限，在1 A cm^-2和800 °C或更高温度下，通常低于70%和200h。 

研究组开发了一种使用Sm₂O₃掺杂CeO₂的封装钴镍合金催化剂，在1 A cm^-2和的800 °C或更高温度下，其CO₂转化为CO的能效为90%，寿命超过2000 h。其对CO的选择性约为100%，单程收率达到90%。研究组表明，该催化剂的功效源于其独特的包封结构和优化的合金成分，同时能够增强CO₂吸附、适度CO吸附和抑制金属团聚。这项工作为高温反应催化剂的设计提供了一种有效的策略，克服了活性和稳定性之间的典型权衡，具有潜在的工业应用价值。

附：英文原文

Title: Encapsulated Co–Ni alloy boosts high-temperature CO2 electroreduction

Author: Ma, Wenchao, Morales-Vidal, Jordi, Tian, Jiaming, Liu, Meng-Ting, Jin, Seongmin, Ren, Wenhao, Taubmann, Julian, Chatzichristodoulou, Christodoulos, Luterbacher, Jeremy, Chen, Hao Ming, Lpez, Nria, Hu, Xile

Issue&Volume: 2025-05-14

Abstract: Electrochemical CO2 reduction into chemicals and fuels holds great promise for renewable energy storage and carbon recycling1,2,3. Although high-temperature CO2 electroreduction in solid oxide electrolysis cells is industrially relevant, current catalysts have modest energy efficiency and a limited lifetime at high current densities, generally below 70% and 200h, respectively, at 1Acm2 and temperatures of 800°C or higher4,5,6,7,8. Here we develop an encapsulated Co–Ni alloy catalyst using Sm2O3-doped CeO2 that exhibits an energy efficiency of 90% and a lifetime of more than 2,000h at 1Acm2 for high-temperature CO2-to-CO conversion at 800°C. Its selectivity towards CO is about 100%, and its single-pass yield reaches 90%. We show that the efficacy of our catalyst arises from its unique encapsulated structure and optimized alloy composition, which simultaneously enable enhanced CO2 adsorption, moderate CO adsorption and suppressed metal agglomeration. This work provides an efficient strategy for the design of catalysts for high-temperature reactions that overcomes the typical trade-off between activity and stability and has potential industrial applications.

DOI: 10.1038/s41586-025-08978-0

Source: https://www.nature.com/articles/s41586-025-08978-0