Interfacial Engineering of Bi 19 Br 3 S 27 Nanowires Promotes Metallic Photocatalytic CO 2 Reduction Activity under Near-Infrared Light Irradiation

Developing highly efficient photocatalysts to utilize solar radiation for converting CO 2 into solar fuels is of great importance for energy sustainability and carbon neutralization. Herein, through an alkali-etching-introduced interface reconstruction strategy, a nanowire photocatalyst denoted as V–Bi 19 Br 3 S 27, with rich Br and S dual-vacancies and surface Bi–O bonding introduced significant near-infrared (NIR) light response, has been developed. The as-obtained V–Bi 19 Br 3 S 27 nanowires exhibit a highly efficient metallic photocatalytic reduction property for converting CO 2 into CH 3 OH when excited solely under NIR light irradiation. Free of any cocatalyst and sacrificial agent, metallic defective V–Bi 19 Br 3 S 27 shows 2.3-fold higher CH 3 OH generation than Bi 19 Br 3 S 27 nanowires. The detailed interfacial structure evolution and reaction mechanism have been carefully illustrated down to the atomic scale. This work provides a unique interfacial engineering strategy for developing high-performance sulfur-based NIR photocatalysts for photon reducing CO 2 into alcohol for achieving high-value solar fuel chemicals, which paves the way for efficiently using the solar radiation energy extending to the NIR range to achieve the carbon neutralization goal.