Low-cost and effective cocatalyst Ni2O3 was loaded on SrTiO3 (STO) via a simple one-step hydrothermal method. The Ni2O3 / SrTiO3 ( m ) photocatalysts were systematically characterized and applied to visible-light-driven CO2 reduction to investigate their photocatalytic activity. The series of the Ni2O3-modified SrTiO3 photocatalysts presented an improved photocatalytic activity and stability. Here, the N5.4STO ( m ) catalyst showed the best photocatalytic activity, with CO and CH4 yielding up to 11.57 and 1.51 μmol / g, respectively, under visible-light irradiation of 3 h, which were 3.15 and 14.84 times higher than that of pure STO(m), respectively. Based on the characterization and experimental results, the enhanced photocatalytic activity might be attributed to the following reasons: (1) Ni2O3 well dispersed on SrTiO3 served as CO2 attachment sites; (2) the modification of Ni2O3 could red shift the absorption edge and broaden the visible-light response ability; and (3) Ni2O3 nanoparticles act as electron traps to capture photogenerated electrons, effectively blocking the recombination of electron–hole pairs. The work offers important insights into the design of non-noble metal oxide cocatalyst modified photocatalysts for electron capture and photoreduction.

中文翻译：

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Ni2O3 改性 SrTiO3 增强可见光光催化 CO2 还原活性

通过简单的一步水热法将低成本且有效的助催化剂 Ni2O3 负载到 SrTiO3 (STO) 上。对 Ni2O3 / SrTiO3 ( m ) 光催化剂进行了系统表征，并将其应用于可见光驱动的 CO2 还原，以研究它们的光催化活性。Ni2O3 修饰的 SrTiO3 系列光催化剂表现出更高的光催化活性和稳定性。其中，N5.4STO(m)催化剂表现出最好的光催化活性，可见光照射3 h后CO和CH4的产率分别达到11.57和1.51 μmol/g，分别是该催化剂的3.15和14.84倍。纯STO（m），分别。根据表征和实验结果，增强的光催化活性可能归因于以下原因：(1) Ni2O3 很好地分散在 SrTiO3 上，作为 CO2 的附着位点；(2) Ni2O3的改性可以使吸收边红移，拓宽可见光响应能力；(3) Ni2O3 纳米粒子作为电子陷阱捕获光生电子，有效阻止电子-空穴对的复合。这项工作为设计用于电子捕获和光还原的非贵金属氧化物助催化剂改性光催化剂提供了重要的见解。