Fabricating Ti3C2 MXene cocatalyst supported NiAl-LDH/g-C3N4 ternary nanocomposite for stimulating solar photocatalytic H2 production
Fabricating Ti3C2 MXene cocatalyst supported NiAl-LDH/g-C3N4 ternary nanocomposite for stimulating solar photocatalytic H2 production
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DOI：
10.1016/j.jece.2022.108010
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发表时间：
2022-08-01
影响因子：
7.7
通讯作者：
Lim, Teik Thye
中科院分区：
文献类型：
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作者：
Almusattar, Wael;Tahir, Muhammad;Lim, Teik Thye
开发有效的纳米结构用于光催化产生H-2一直是广泛研究的焦点，旨在减轻相关的能源和环境问题。自然光合作用的内在动力可以通过构建基于Z方案的电荷转移异质结构来显着复制。在这项研究中，一个二维的Ti 3C 2 MXene支持NiAl-LDH/g-C3 N4异质结增加可见光下的光催化H（2）的生产已经在设计和制造方面进行了研究。采用改进的水热技术制备了NiAl-LDH/Ti 3C 2/g-C3 N4复合材料，考察了催化剂用量、牺牲剂和辐照时间等因素对复合材料性能的影响。NiAl-LDH/Ti_3C_2/g-C_3 N_4复合材料的光催化活性达到720 μ mol/g，分别是g-C_3 N_4、NiAl-LDH/g-C_3 N_4和Ti_3C_2/g-C_3 N_4的2、1.4和1.2倍。这种明显增强的活性是由于在Ti 3C 2 MXene存在下形成Z-方案异质结，其有助于最大化氧化/还原反应并促进光诱导电子-空穴对的分离和迁移。此外，使用三乙醇胺与100毫克催化剂负载，最高的H-2产率，由于更多的反应物附着在催化剂表面上，光扩散效应最小。发现层状复合材料的稳定层状结构、可切换性和高的界面接触面积对提高光催化制氢效率起着至关重要的作用。
The development of effective nanotextures for photocatalytic H-2 generation has been the focus of extensive study aimed to alleviate the associated energy and environmental problems. The intrinsic power of natural photosynthesis may be significantly replicated by constructing Z-scheme-based charge-transfer heterostructures. In this study, a two-dimensional Ti3C2 MXene supported NiAl-LDH/g-C3N4 heterojunction for increased photocatalytic H(2 )production under visible light has been examined in terms of design and fabrication. A modified hydrothermal technique was used to create a composite of NiAl-LDH/Ti3C2/g-C3N4 and the effect of variables including catalyst loading, sacrificial reagents, and irradiation time was investigated. The photocatalytic activity of NiAl-LDH/ Ti3C2/g-C3N4 composite for H-2 evolution reached to 720 mu mol/g, which is 2, 1.4, and 1.2 times greater than g-C3N4, NiAl-LDH/g-C3N4, and Ti3C2/g-C3N4 samples, respectively. This obvious augmented activity was due to the formation of Z-scheme heterojunctions which contributed to maximize oxidation/reduction reaction and facilitating separation and migration of photoinduced electron-hole pairs in the presence of Ti3C2 MXene. Furthermore, using Triethanolamine with 100 mg catalyst loading, highest H-2 yield was attained due to more attachment of reactants over the catalyst surface with minimum light diffusions effects. The stable layered structure, switchable property of layered composites and high interface contact area of the composite was discovered to play crucial roles in boosting the photocatalytic efficiency for H-2 production.