Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, School of Physics, Nanjing University, Nanjing 210093, P. R. China.
Nanoscale. 2017 Jul 6;9(26):9065-9070. doi: 10.1039/c7nr03238b.
Two-dimensional MoS nanosheets were in situ grown on TiO nanosheets to form two-dimensional (2D) hybrid nanojunctions, with which MoS nanosheets compactly contact with TiO to increase the interfacial area. MoS was identified as a promising cost-effective substitute for noble metal cocatalysts such as Pt, Au, and Ag, and shows superior activity and selectivity for reducing CO to CHOH in aqueous solution to these metal cocatalysts under UV-vis light irradiation. The photo-luminescence (PL) spectra and transient time-resolved PL decay measurements reveal that the fast electron transfer from TiO to MoS can minimize charge recombination losses to improve the conversion efficiency of photoreduction. It reveals that Mo-terminated edges of MoS nanosheets possess the metallic character and a high d-electron density, and the Mo cation sites may benefit the stabilization of CHO intermediates via electrostatic attraction to enhance the CHOH formation from the reduction of CO in aqueous solution.
二维 MoS 纳米片原位生长在 TiO 纳米片上，形成二维（2D）混合纳结，其中 MoS 纳米片与 TiO 紧密接触，增加了界面面积。MoS 被认为是一种很有前途的、具有成本效益的替代贵金属共催化剂的材料，如 Pt、Au 和 Ag，并且在紫外可见光照射下，它在水溶液中将 CO 还原为 CHOH 的活性和选择性均优于这些金属共催化剂。光致发光（PL）光谱和瞬态时间分辨 PL 衰减测量表明，从 TiO 到 MoS 的快速电子转移可以最小化电荷复合损失，从而提高光还原的转化效率。这表明 MoS 纳米片的 Mo 端边缘具有金属特性和高 d 电子密度，Mo 阳离子位点可能通过静电吸引有利于 CHO 中间体的稳定，从而增强水溶液中 CO 还原生成 CHOH。
