Synergistic enhancement of hydrogen production by ZIF-67(Co) derived Mo-Co-S modified g-C3N4/rGO photocatalyst
Synergistic enhancement of hydrogen production by ZIF-67(Co) derived Mo-Co-S modified g-C3N4/rGO photocatalyst
复制标题
ZIF-67(Co)衍生的Mo-Co-S修饰的g-C3N4/rGO光催化剂协同增强产氢
DOI：
10.1007/s10562-018-2593-z
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发表时间：
2019
影响因子：
2.8
通讯作者：
Zhiliang Jin
中科院分区：
文献类型：
--
作者：
Yongke Zhang;Zhiliang Jin
通过简单的水热反应并在管式炉中用氮气煅烧，成功制备了一种新型高活性 g-C3N4/rGO/Mo-Co-S。以硫代乙酰胺为硫源、ZIF-67(Co)为钴源、钼酸钠为钼源，通过高温水热反应和一步硫化成功制备了Mo-Co-S助催化剂。 g-C3N4/rGO纳米片和新型Mo-Co-S助催化剂为染料吸附提供了较大的空间，也为反应提供了更多的反应位点。它在 g-C3N4、rGO 和 Mo-Co-S 之间表现出协同效应，可实现非常高效的光催化制氢。在光照射下，EY染料充当光敏剂，拓宽了半导体的可见光吸收范围和吸收强度，形成光生电荷的有效分离。作为电子供体，TEOA可以被空穴氧化，从而消耗空穴，提高电荷分离效率。 g-C3N4/rGO/Mo-Co-S光催化剂在可见光照射下5小时最大析氢量达到约589μmol，是纯g-C3N4的23.5倍。高光电流响应、更快的电子转移速率常数（Ket= 1.36 × 109s−1）、短的荧光寿命（0.33 ns）以及较小的Rs（19.46 Ω）和Ret（59.67 Ω）共同加速了有效的空间电荷转移，从而提高了光催化产氢的活性。
A novel and high active g-C3N4/rGO/Mo–Co–S is successfully prepared by a simple hydrothermal reaction and calcination with nitrogen in a tube furnace. Using thioacetamide as the sulfur source, ZIF-67 (Co) as the cobalt source, and sodium molybdate as the molybdenum source, the Mo–Co–S co-catalyst is successfully prepared by high-temperature hydrothermal reaction and one-step sulfidation. The g-C3N4/rGO nanosheets and the new Mo–Co–S co-catalyst provide a large space for dye adsorption and also provide more reactive sites for the reaction. It exhibits synergistic effect between g-C3N4, rGO and Mo–Co–S on very high efficient photocatalytic hydrogen production. Under light irradiation, the EY dye acts as a photosensitizer, which broadens the visible light absorption range and absorption intensity of the semiconductor and forms an effective separation of the photogenerated charge. As an electron donor, TEOA can be oxidized by holes, thereby consuming holes and improving the efficiency of charge separation. The maximum amount of hydrogen evolution reaches about 589 μmol for 5 h over the g-C3N4/rGO/Mo–Co–S photocatalyst under visible light irradiation, which is 23.5 times higher than that of the pure g-C3N4. The high photocurrent response, the faster electron-transfer rate constant (Ket= 1.36 × 109s−1), the short fluorescence lifetime (0.33 ns) and the small Rs(19.46 Ω) and Ret(59.67 Ω) together accelerated the efficient spatial charges transfer, thereby increasing the photocatalytic activity of H2production.Graphical Abstract