It is known that the efficiency of the hydrogen evolution reaction (HER) can be promoted by the presence of proton relay groups neighboring a catalytic metal center. This work reports the synthesis of two new Co(III) corroles (2 and 3) with hangman proton relay groups for the electrocatalytic HER. When using trifluoroacetic acid (TFA) as a proton source, complexes 2 and 3 exhibited turnover frequencies (TOFs) of 219.36 s⁻¹ and 199.57 s⁻¹, respectively. The catalytic HER undergoes via the EECEC or EECC pathway (E: electron transfer; C: charge transfer) depending on the acidity and concentration of the proton source. Moreover, complex 2 and 3 also showed good HER activity in aqueous media with Faraday efficiencies (FEs) of 93.6% and 89.2% respectively.

中文翻译：

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Co(III) 与悬挂的酰胺基苯酚和酰胺基吡啶作为质子中继臂进行咔唑，以促进电催化析氢反应


众所周知，催化金属中心附近质子中继基团的存在可以提高析氢反应（HER）的效率。这项工作报道了两种新的 Co( III ) 咔咯化合物（ 2和3 ）与 Hangman 质子中继基团的合成，用于电催化 HER。当使用三氟乙酸（TFA）作为质子源时，配合物2和3的周转频率（TOF）分别为219.36 s ^-1和199.57 s ^-1 。催化 HER通过EECEC 或 EECC 途径（E：电子转移；C：电荷转移）进行，具体取决于质子源的酸度和浓度。此外，配合物2和3在水介质中也表现出良好的HER活性，法拉第效率（FE）分别为93.6%和89.2%。