一步法合成Bi_(5)O_(7)I用于极低温CO_(2)电还原

One-step synthesized Bi_(5)O_(7)I for extremely low-temperature CO_(2) electroreduction

电催化二氧化碳还原反应(CO_(2)RR)不仅可以推动实现碳达峰和碳中和,还可以实现火星的原位资源利用。考虑到火星地表温度在-50℃左右,同时富含大量的CO_(2)和固体水,有望在火星上利用CO_(2)RR制备含碳燃料,然而,用于CO,RR的非贵金属催化剂的大规模制备及极低温CO_(2)RR性能研究等问题亟待解决。本文采用了一种简单的一步超声合成法,实现了针尖状Bi_(5)O_(7)I的大规模制备,Bi_(5)O_(7)I催化剂在室温下表现了对甲酸盐的高选择性以及大电流密度将Bi_(5)O_(7)I作为阴极组装的电解池,可在-50℃下工作,甲酸盐的选择性大于90%.此外,由Bi_(5)O_(7)I组装的Zn-CO_(2)电池在-50℃下能稳定循环14h.该工作不仅为大批量合成Bi_(5)O_(7)I提供了一种简单且温和的方法,而且探究了CO_(2)RR在极低温环境下的适应性.

Electrocatalytic CO_(2) reduction reaction(CO_(2)RR)could not only facilitate carbon peaking and carbon neutrality,but also realize the in-situ utilization of Mars resources[1–3].As known,Mars is rich in CO_(2)(content of 96%in the atmosphere)and solid water,which are expected to be converted into carbonaceous fuels through the electrochemical CO_(2) reduction technology[4–6].In theory,the electrolysis of CO_(2) on Mars could solve the problem of long-distance resources transportation through in-situ conversion/utilization of extraterrestrial resources,presenting great potentials to support the human survival on Mars(Fig.1a)[7,8].However,the electrocatalytic CO_(2) conversion technology in extraterrestrial space needs to overcome two key challenges:effi-cient and scalable electrode catalysts[9]and extremely environmental adaptability of electrolysis reactions.Most of the synthetic routes involve high-temperature reactions and/or solvothermal reactions.Their disadvantages of low yield and large consumption of additives still exist.Keeping above in mind,it is anticipated to realize the scalable synthesis of non-noble-metal catalysts for CO_(2)RR.