To develop photocatalysts with desirable compositions and structures for improving the efficiency and selectivity of CO₂ conversion to CH₄ under mild conditions is of great importance. Here, we design an effective photocatalyst of bimetal (Ag/Pd) nanoalloys supported on nitrogen-doped TiO₂ nanosheet for CO₂ conversion. Such a novel photocatalyst combines multiple advantages of abundant Ti³⁺ ions, oxygen vacancies, and substitutional nitrogen that are favorable for catalyzing CO₂ reduction. It was found that CO₂ could be efficiently transformed to CH₄ under mild conditions, i.e., in aqueous solution and at atmospheric pressure and room temperature. The maximum production rate of CH₄ can reach 79.0 μmol g^–1 h^–1. Moreover, the Ag/Pd bimetals supported on N-doped TiO₂ nanosheet exhibit high selectivity to CH₄. The as-synthesized photocatalyst can be well recycled for CO₂ reduction.

中文翻译：

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光催化CO ₂转化至CH ₄通过支持对n型掺杂的TiO银/钯双金属₂纳米片

开发具有期望的组成和结构以提高在温和条件下将CO ₂转化为CH ₄的效率和选择性的光催化剂是非常重要的。在这里，我们设计了一种负载在氮掺杂的TiO ₂纳米片上的双金属（Ag / Pd）纳米合金的有效光催化剂，用于CO ₂转化。这种新颖的光催化剂结合了丰富的Ti ³⁺离子，氧空位和取代氮的多种优点，这些优点有利于催化CO ₂还原。发现CO ₂可以有效地转化为CH ₄在温和的条件下，即在水溶液中，在大气压和室温下。CH ₄的最大生产率可以达到79.0μmolg ^–1 h ^–1。而且，负载在N掺杂的TiO ₂纳米片上的Ag / Pd双金属对CH ₄表现出高选择性。合成后的光催化剂可以很好地回收用于减少CO ₂。