The complex [Co(CR)Br₂]⁺, where CR is the redox-active macrocycle 2,12-dimethyl-3,7,11,17-tetraazabicyclo-[11.3.1]-heptadeca-1(17),2,11,13,15-pentaene, is known as an electrocatalyst for the reduction of aqueous nitrite (NO₂^–). Here, we report that buffer induces a catalytic wave for NO₂^– reduction at a significantly more anodic potential than under unbuffered conditions. In addition, buffer increases the rate of electrocatalysis. This enhanced electrocatalytic activity is enabled by a number of buffering agents, with 3-(N-morpholino)propanesulfonic acid showing the largest catalytic current. In addition to the greater catalytic activity, buffering agents influence the selectivity of the reduction products, as well as catalyst longevity.

中文翻译：

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缓冲液诱导的电催化亚硝酸盐还原：对催化速率和产物选择性的影响


配合物 [Co(CR)Br ₂ ] ⁺ ，其中 CR 是氧化还原活性大环 2,12-二甲基-3,7,11,17-四氮杂双环-[11.3 .1]-heptadeca-1(17),2,11,13,15-pentaene，被称为用于还原含水亚硝酸盐（NO ₂ ^– ）的电催化剂。在这里，我们报告缓冲液在比无缓冲条件下明显更高的阳极电位下诱导 NO ₂ ^– 还原的催化波。此外，缓冲液提高了电催化速率。这种增强的电催化活性是通过多种缓冲剂实现的，其中 3-(N-吗啉代)丙磺酸显示出最大的催化电流。除了更高的催化活性之外，缓冲剂还影响还原产物的选择性以及催化剂的寿命。