Considering the influence of carbon dioxide (CO₂) on global warming, an all-solution approach is presented here to fabricate nanocrystalline film of the ternary chalcopyrite for the photoelectrochemical CO₂ reduction. High-purity nanocrystalline catalysts CuGaS₂, Cu(Ga,Bi)S_2, and Cu(Ga,In)S₂ were obtained by a facile and fast spray method using a molecular ink. Those semiconductors were evaluated in the photoelectrocatalytic CO₂ reduction under illumination of 1 Sun (100 mW cm⁻²) applying potentials from − 0.3 V to − 0.7 V vs Ag/AgCl. Methanol was identified as the major product, furthermore, 2 C and 3 C compounds were also identified. Despite the interesting results, doping with In and Bi caused the formation of defects in the absorber layer, probably inducing recombination mechanisms, thus, affecting the stability and the performance of the photocathode in the CO₂ reduction. Meanwhile, Mo/CuGaS₂/CdS/TiO₂ photocathode showed promising stability and reproducibility for CO₂ reduction under illumination (100 mW cm⁻²) for 240 min at − 0.7 V.

考虑到二氧化碳 (CO ₂ ) 对全球变暖的影响，本文提出了一种全解决方案来制备用于光电化学 CO ₂还原的三元黄铜矿纳米晶薄膜。高纯度纳米晶催化剂CuGaS ₂、Cu(Ga,Bi)S ₂和Cu(Ga,In)S ₂使用分子墨水通过简便快速的喷涂法获得。那些半导体在光电催化CO进行评价₂下1太阳（100mW的厘米的照度降低^-2) 施加从 - 0.3 V 到 - 0.7 V vs Ag/AgCl 的电位。甲醇被确定为主要产物，此外，还确定了 2 C 和 3 C 化合物。尽管有有趣的结果，但掺杂 In 和 Bi 会导致吸收层中形成缺陷，可能会诱导复合机制，从而影响光阴极在 CO ₂还原中的稳定性和性能。同时，Mo/CuGaS ₂ /CdS/TiO ₂光电阴极在 - 0.7 V 条件下（100 mW cm -2 ）照射下（100 mW cm ^-2）240 min表现出良好的CO _{2还原稳定性和重现性。}