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UiO-66-NH2 Metal-Organic Frameworks with Embedded MoS2 Nanoflakes for Visible-Light-Mediated H2 and O2 Evolution.
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-07-06 , DOI: 10.1021/acs.inorgchem.0c01030
Satyabrata Subudhi 1 , Gayatri Swain 1 , Suraj Prakash Tripathy 1 , Kulamani Parida 1
Affiliation  

Hydrogen evolution from water splitting by means of a photocatalytic approach is an ideal future energy source and free of fossil reserves, in contrary photocatalytic O2 evolution remains a bottleneck due to high over potential and low efficiency. For reasonable use of solar light, photocatalysts must be sufficiently stable and efficient toward harvesting of sunlight from both theoretical and practical viewpoints. In this regard, here we have prepared MoS2-modified UiO-66-NH2 MOF through a facile hydrothermal technique and evaluated its efficiency toward photocatalytic H2 and O2 evolution by water splitting in the presence of sacrificial agents. A couple of similar type of analyses have been studied previously; however, this analysis represents a diverse scientific approach on the basis of interfacial contact toward reveal the actual potential of nanoflakes MoS2 as well as UiO-66-NH2. In this regard the as-synthesized photocatalyst was well-characterized by XRD, FTIR, UV–vis diffuse reflectance spectra, FESEM, HRTEM, XPS, and BET analysis techniques, which provide sufficient evidence toward successful synthesis of the pristine materials and efficacious anchorage of MoS2 on the active surface of UiO-66-NH2 by the ionic interaction between Zr–O and S/Mo. Among the synthesized photocatalysts (3 wt %) MoS2/UiO-66-NH2 shows the optimum outcome toward H2 and O2 evolution, i.e., 512.9 μmol/h (4.37 times greater than bare UiO-66-NH2) and 263.6 μmol/h (4.25 and 11.32 times greater than bare UiO-66-NH2 and MoS2, respectively). The superior performance obtained by the composite is due to the synergistic effect of pristine UiO-66-NH2 and MoS2 which proceeds through a type-II interband alignment for the facile channelization of excitons. This investigation will bestow a beneficial blue-print to construct challenging photocatalysts and to find out the paramount performance toward photocatalytic water redox reaction.

中文翻译:

具有嵌入式MoS2纳米薄片的UiO-66-NH2金属有机框架,用于可见光介导的H2和O2的演化。

通过光催化方法将水分解产生的氢气是一种理想的未来能源,并且没有化石储量,相反,由于高电势和低效率,光催化O 2的释放仍然是瓶颈。为了合理地使用太阳光,从理论和实践的角度来看,光催化剂必须足够稳定和有效地防止太阳光的收集。在这方面,这里我们通过简便的水热技术制备了MoS 2改性的UiO-66-NH 2 MOF,并评估了其对光催化H 2和O 2的效率。在牺牲剂的存在下通过水分解产生的进化。先前已经研究了几种类似类型的分析。然而,该分析代表了基于界面接触的多种科学方法,旨在揭示纳米薄片MoS 2以及UiO-66-NH 2的实际潜力。在这方面,通过XRD,FTIR,UV-vis漫反射光谱,FESEM,HRTEM,XPS和BET分析技术,可以很好地表征合成后的光催化剂,这为成功合成原始材料和有效的锚固提供了充分的证据。通过Zr–O与S / Mo之间的离子相互作用,UiO-66-NH 2活性表面上的MoS 2。在合成的光催化剂(3 wt%)中2 / UiO-66-NH 2对H 2和O 2的释放显示出最佳结果,即512.9μmol/ h(比裸UiO-66-NH 2高4.37倍)和263.6μmol/ h(比4.25和11.32倍大)分别比裸露的UiO-66-NH 2和MoS 2高)。复合材料获得的优异性能归因于原始UiO-66-NH 2和MoS 2的协同作用,该作用通过II型带间排列进行,以实现激子的便捷通道化。这项研究将为构建具有挑战性的光催化剂并找出对光催化水氧化还原反应至关重要的性能提供有益的蓝图。
更新日期:2020-07-20
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