Abstract Photocatalytic reduction of CO2 to fuel offers an exciting opportunity for helping to solve current energy and global warming problems. Although a number of solar active catalysts have been reported, most of them suffer from low product yield, instability, and low quantum efficiency. Therefore, the design and fabrication of highly active photocatalysts remains an unmet challenge. In the current work we utilize hydrogen-doped, blue-colored reduced titania for photocatalytic conversion of CO2 into methane (CH4). The photocatalyst is obtained by exposure of TiO2 to NaBH4 at 350 °C for 0.5 h. Sensitized with Pt nanoparticles, the material promotes solar spectrum photoconversion of CO2 to CH4 with an apparent quantum yield of 12.40% and a time normalized CH4 generation rate of 80.35 μmol g−1 h−1, which to the best of our knowledge is a record for photocatalytic-based CO2 reduction. The material appears intrinsically stable, with no loss in sample performance over five 6 h cycles, with the sample heated in vacuum after each cycle.

中文翻译：

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缺陷诱导的二氧化钛纳米粒子的高度增强和稳定的活性用于太阳光驱动的 CO 2 还原为 CH 4

摘要 CO2 光催化还原为燃料为帮助解决当前的能源和全球变暖问题提供了一个令人兴奋的机会。尽管已经报道了许多太阳能活性催化剂，但它们中的大多数都存在产品收率低、不稳定性和量子效率低的问题。因此，高活性光催化剂的设计和制造仍然是一个未解决的挑战。在目前的工作中，我们利用掺氢、蓝色还原二氧化钛将 CO2 光催化转化为甲烷 (CH4)。光催化剂是通过将 TiO2 暴露于 NaBH4 在 350°C 下 0.5 小时获得的。用 Pt 纳米粒子敏化，该材料促进 CO2 到 CH4 的太阳光谱光转化，表观量子产率为 12.40%，时间归一化 CH4 生成率为 80.35 μmol g-1 h-1，据我们所知，这是基于光催化的 CO2 还原的记录。该材料看起来本质上是稳定的，在 5 个 6 小时循环内样品性能没有损失，每个循环后样品在真空中加热。