Solar-energy-driven photoreduction of CO₂ to hydrocarbon fuels is an interesting and challenging topic, which generally requires photocatalysts with the capability to capture and photoreduce CO₂ simultaneously. Herein, we demonstrate that a N,O,P-containing covalent organic polymer (NOP-COP) prepared via condensation of hexachlorocyclotriphosphazene with barbituric acid can capture CO₂ and further photocatalyze its reduction to CH₄ under visible-light irradiation. The characterization information indicates that the incorporation of phosphorus in the skeleton of NOP-COP promoted the absorption of visible light and improved the lifetime of the photoinduced carriers. As a result, NOP-COP exhibited enhanced efficiency for photoreduction of CO₂ compared with the N,O-containing polymer, affording CH₄ as the sole carbonaceous product with a rate of 22.5 μmol g_cat^–1 h^–1 and selectivity over 90%. This work provides insight into designing and fabricating polymeric photocatalysts for CO₂ photoreduction to fuels.

中文翻译：

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含N，O，P的共价有机聚合物亚微球在可见光驱动下将CO ₂还原为CH ₄

太阳能驱动的将CO ₂光催化还原为烃类燃料是一个有趣且具有挑战性的主题，这通常需要具有同时捕获和光还原CO ₂的能力的光催化剂。本文中，我们证明通过六氯环三磷腈与巴比妥酸缩合制备的含N，O，P的共价有机聚合物（NOP-COP）可以捕获CO ₂并进一步光催化将其还原为CH ₄在可见光照射下。表征信息表明，在NOP-COP的骨架中掺入磷促进了可见光的吸收并延长了光诱导载流子的寿命。结果，与含N，O的聚合物相比，NOP-COP表现出了更高的CO _2光还原效率，提供了CH ₄作为唯一的碳质产物，速率为22.5μmolg _cat ^–1 h ^–1，选择性超过90 ％。这项工作为设计和制造用于将CO ₂光还原为燃料的聚合物光催化剂提供了见识。