Photocatalytic water splitting to produce hydrogen is one of the important ways to solve energy crisis. Most transition metal sulfide semiconductors which have wide optical band gap are impractical for long wavelength visible light driven water splitting. Therefore, modulation of broad band gap has become a significant strategy and a huge challenge to achieve efficient catalyst for photocatalytic water splitting. Here, we report the synthesis of a ternary photocatalyst MnS/CoS₂/CDs applied for long wavelength visible-light-driven water splitting without the requirement for any sacrificial agents. The optimal MnS/CoS₂/CDs nanocomposite (CoMn-S/CDs) as an effective photocatalyst exhibits excellent photocatalytic activity with H₂ evolution rate of 0.421 μmol/h and O₂ evolution rate of about 0.051 μmol/h under visible light irradiation (420 nm ≤ λ ≤ 700 nm) when the concentration of CDs is 0.039 g_CDs/g_catalyst. In particular, the H₂ evolution rate is 0.076 μmol/h and O₂ evolution rate is about 0.010 μmol/h at λ = 535 nm while the H₂ evolution rate is 0.024 μmol/h and O₂ evolution rate is about 0.004 μmol/h at λ = 630 nm. The efficient photocatalytic activity may attribute to the synergistic effect of the ternary sturctures, in which MnS is the major component for photocatalysis, addition of CoS₂ component enables the photocatalyst to capture light of wider range and CDs provide reduction sites.

光催化分解水产生氢气是解决能源危机的重要途径之一。对于长波长可见光驱动的水分解，大多数具有宽光学带隙的过渡金属硫化物半导体是不切实际的。因此，宽带隙的调节已成为实现用于光催化水分解的有效催化剂的重要策略和巨大挑战。在这里，我们报告三元光催化剂MnS / CoS ₂ / CDs的合成，用于长波长可见光驱动的水分解，无需任何牺牲剂。最佳MnS / CoS ₂ / CDs纳米复合材料（CoMn-S / CDs）作为有效的光催化剂，对H ₂表现出优异的光催化活性当CDs浓度为0.039 g _CDs / g_催化剂时，在可见光（420nm≤λ≤700nm）照射下，析出速率为0.421μmol/ h，O ₂析出速率为0.051μmol/ h 。特别地，将H ₂生成速率为0.076微摩尔/小时和O ₂生成速率为约0.010微摩尔/小时在λ= 535nm处而H ₂生成速率为0.024微摩尔/小时和O ₂生成速率为约0.004微摩尔/ λ= 630 nm时的h。有效的光催化活性可能归因于三元结构的协同效应，其中MnS是光催化的主要成分，添加了CoS ₂ 组分使光催化剂能够捕获更宽范围的光，而CD则提供了还原位点。