A series of Rh₂(II,II) complexes were shown to electrocatalytically reduce CO₂ to HCOOH. Electrochemical and spectroelectrochemical studies reveal a correlation between catalytic selectivity and efficiency with the steric bulk at the axial sites afforded by the bridging ligands. Mechanistic studies point to the presence of a Rh₂(II,I)–H hydride as a key intermediate in the catalytic cycle.

中文翻译：

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铱配合物作为将CO2还原为HCOOH的电催化剂：位阻对选择性的作用

一系列Rh ₂（II，II）配合物被证明可以将CO ₂电催化还原为HCOOH。电化学和光谱电化学研究揭示了桥联配体所提供的轴向位点处的催化选择性与效率之间的相关性。机理研究指出，Rh ₂（II，I）–H氢化物的存在是催化循环中的关键中间体。