Promoting Selective Generation of Formic Acid from CO<sub>2</sub> Using Mn(bpy)(CO)<sub>3</sub>Br as Electrocatalyst and Triethylamine/Isopropanol as Additives
作者:Monica R. Madsen、Magnus H. Rønne、Marvin Heuschen、Dusanka Golo、Mårten S. G. Ahlquist、Troels Skrydstrup、Steen U. Pedersen、Kim Daasbjerg
DOI:10.1021/jacs.1c10805
日期:2021.12.8
Urgent solutions are needed to efficiently convert the greenhouse gas CO2 into higher-value products. In this work, fac-Mn(bpy)(CO)3Br (bpy = 2,2′-bipyridine) is employed as electrocatalyst in reductive CO2 conversion. It is shown that product selectivity can be shifted from CO toward HCOOH using appropriate additives, i.e., Et3N along with iPrOH. A crucial aspect of the strategy is to outrun the dimer-generating
需要紧急解决方案来有效地将温室气体 CO 2转化为更高价值的产品。在这项工作中,fac -Mn(bpy)(CO) 3 Br(bpy = 2,2'-联吡啶)用作还原 CO 2转化的电催化剂。结果表明,使用适当的添加剂,即 Et 3 N 和i PrOH ,可以将产物选择性从 CO 转变为 HCOOH 。该策略的一个关键方面是超越涉及fac -Mn(bpy)(CO) 3 Br 和 [Mn(bpy)(CO) 3 ] -的产生二聚体的亲子反应而是生产锰氢化物中间体。优选地,这是在第一次还原波中完成的,以便能够在低至 260 mV 的过电位和 59 ± 1% 的法拉第效率下形成 HCOOH。后者可以在 560 mV 的过电位下增加到 71 ± 3%,使用 2 M 浓度的 Et 3 N 和i PrOH。胺添加剂的性质对产品选择性至关重要,因为如果 Et 3 N 被 Et 2 NH取代,HCOOH 形成的法拉第效率会降低至