In this work, Ni modified porous In₂O₃ photocatalysts were synthesized by a facile precipitation approach and used for photocatalytic reduction of CO₂ into renewable fuels. A series of characterization techniques including XRD, SEM, TEM/HRTEM, PL spectrum, UV–vis DRS, and CV were performed to investigate the crystal structure, morphology, optical and electronic property of catalysts. The results showed that doping of Ni in the lattice of In₂O₃ obviously decreased the crystal size, narrowed band gap and improved visible light absorption capability. Meanwhile, the strength and amount of adsorbed CO₂ species were greatly enhanced after the doping of Ni due to the increase of active sites. As a result, Ni doped In₂O₃ samples show much higher photocatalytic activity for CO₂ reduction compared to undoped one. With optimal Ni doping amount, the highest production rates of H₂, CO and CH₄ were 27.8, 20.8 and 66.2 $\text{μ}\text{m}\text{o}\text{l}\bullet g_{cat}^{-1}\bullet {\text{h}}^{-1}$, respectively, which was about 4.9, 2.7 and 3.1 times higher than undoped In₂O₃, respectively. This work provides insights on designing and synthesizing highly active photocatalysts for solar fuel production.

在这项工作中，Ni 修饰的多孔 In ₂ O ₃光催化剂通过简便的沉淀方法合成，并用于将 CO ₂光催化还原为可再生燃料。使用XRD、SEM、TEM/HRTEM、PL光谱、UV-vis DRS和CV等一系列表征技术来研究催化剂的晶体结构、形貌、光学和电子性质。结果表明，在In ₂ O ₃晶格中掺杂Ni明显减小了晶体尺寸，缩小了带隙，提高了可见光吸收能力。同时，吸附CO ₂的强度和量由于活性位点的增加，Ni掺杂后物种大大增强。因此，与未掺杂的样品相比，Ni 掺杂的 In ₂ O ₃样品显示出更高的 CO ₂还原光催化活性。在最佳Ni掺杂量下，H ₂、CO和CH ₄的最高产率分别为27.8、20.8和66.2$\text{μ}\text{米}\text{○}\text{升}\bullet G_{C\mathrm{一种}吨}^{——1}\bullet {\text{H}}^{——1}$分别比未掺杂的 In ₂ O ₃高约 4.9、2.7 和 3.1 倍。这项工作为设计和合成用于太阳能燃料生产的高活性光催化剂提供了见解。