Interior and Surface Synergistic Modifications Modulate the SnNb<sub>2</sub>O<sub>6</sub>/Ni-Doped ZnIn<sub>2</sub>S<sub>4</sub> S-Scheme Heterojunction for Efficient Photocatalytic H<sub>2</sub> Evolution
Chunxue Li, Xiaoteng Liu, Guixiang Ding, Pengwei Huo, Yan Yan, Yan Yan, Yongsheng Yan, Yongsheng Yan, Guangfu Liao
Abstract
Interior and surface synergistic modifications can endow the photocatalytic reaction with tuned photogenerated carrier flow at the atomic level. Herein, a new class of 2D/2D SnNb2O6/Ni-doped ZnIn2S4 (SNO/Ni-ZIS) S-scheme heterojunctions is synthesized by a simple hydrothermal strategy, which was used to evaluate the synergy between interior and surface modifications. Theoretical calculations show that the S-scheme heterojunction boosts the desorption of H atoms for rapid H2 evolution. As a result, 25% SNO/Ni0.4-ZIS exhibits significantly improved PHE activity under visible light, roughly 4.49 and 2.00 times stronger than that of single ZIS and Ni0.4-ZIS, respectively. In addition, 25% SNO/Ni0.4-ZIS also shows superior structural stability. This work provides advanced insight for developing high-performance S-scheme systems from photocatalyst design to mechanistic insight.