An Mn-complex supported on multi-walled carbon nanotubes (MWCNTs) has been reported to be a superior catalyst for CO₂ reduction to CO, where the carbon support strongly influences the catalytic activity, enabling operation at a low overpotential. Here, the effects of various carbon supports on the activity of a Mn-complex catalyst were investigated. Among the various carbon supports, which included carbon black and MWCNTs, carbon nanohorns (CNHs) were the best support for enhancing the catalytic activity of the Mn-complex toward CO₂ reduction. This enhancement was attributed to the CNHs’ high specific surface area and hydrophobic nature. For solar-driven CO₂ reduction to CO, the Mn-complex catalyst supported on CNHs was series-connected to Ni-doped β-FeOOH as a water oxidation catalyst via a Si solar cell; a solar-to-CO conversion efficiency of 3.3±0.4% was achieved in a single-compartment reactor.

中文翻译：

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碳纳米角支持太阳能驱动的 CO2 在全地球丰富系统中由 Mn 络合物催化还原为 CO

据报道，负载在多壁碳纳米管 (MWCNT) 上的 Mn 络合物是将 CO ₂还原为 CO的优良催化剂，其中碳载体强烈影响催化活性，从而能够在低过电位下运行。在这里，研究了各种碳载体对 Mn 络合物催化剂活性的影响。在包括炭黑和 MWCNTs 在内的各种碳载体中，碳纳米角 (CNHs) 是提高 Mn 配合物对 CO ₂还原的催化活性的最佳载体。这种增强归因于 CNH 的高比表面积和疏水性。对于太阳能驱动的 CO ₂还原为 CO，负载在 CNHs 上的 Mn 络合物催化剂通过 Si 太阳能电池串联连接到 Ni 掺杂的 β-FeOOH 作为水氧化催化剂；在单室反应器中实现了 3.3±0.4% 的太阳能到 CO 的转化效率。