Facile synthesis of Co2(OH)3Cl/cobalt carbide/reduced graphene oxide composites for enhanced dye-sensitized photocatalytic H2 evolution,Sustainable Energy & Fuels

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Facile synthesis of Co2(OH)3Cl/cobalt carbide/reduced graphene oxide composites for enhanced dye-sensitized photocatalytic H2 evolution
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-10-23 , DOI: 10.1039/d0se01347a
Weiying Zhang _{1,

2,

3,

4} , Yanli Zou _{1,

2,

3,

4} , Xiang Mei _{1,

2,

3,

4} , Yuexiang Li _{1,

2,

3,

4} , Shaoqin Peng _{1,

2,

3,

4} , Junying Xu _{1,

2,

3,

4}

Affiliation

Photocatalytic H₂ evolution from water splitting using catalysts has proven to be a promising strategy. In photocatalytic H₂ evolution, a hydrogen evolution cocatalyst is necessary. The cocatalyst should be inexpensive and efficient. In this work, a hollow Co₂(OH)₃Cl/cobalt carbide/reduced graphene oxide (RGO) composite was fabricated as a cocatalyst via the one-step thermal treatment at low temperature (300 °C and 350 °C) of CoCl₂/graphene oxide (GO). Cobalt carbide was formed based on the strong interaction between GO and Co²⁺. GO not only provides the carbon source for cobalt carbide, but also acts as a soft template of a hollow structure and promotes the distribution of active species. The obtained sample exhibits a much higher dye-sensitized photocatalytic H₂ evolution activity than the catalysts prepared at high temperature (500 °C and 600 °C), which mainly consist of CoO/Co/cobalt carbide/RGO. This enhanced activity is ascribed to the formation of highly dispersed cobalt carbide and Co₂(OH)₃Cl, the effective electron transfer between them, and the ability of Co₂(OH)₃Cl to efficiently convey electrons from excited dye molecules. The highest apparent quantum yield of dye-sensitized photocatalytic H₂ evolution obtained using our catalyst was 28.3% at 420 nm. The possible mechanism is also discussed.

中文翻译：

轻松合成Co2（OH）3Cl /碳化钴/还原氧化石墨烯复合材料以增强染料敏化光催化H2的释放

使用催化剂由水分解产生的光催化H ₂事实证明是一种有前途的策略。在光催化的H ₂析出中，氢析出助催化剂是必需的。助催化剂应廉价且有效。在这项工作中，通过CoCl的低温（300°C和350°C）一步热处理，制备了空心Co ₂（OH）₃ Cl /碳化钴/还原氧化石墨烯（RGO）复合材料作为助催化剂。₂ /氧化石墨烯（GO）。基于GO和Co ²⁺之间的强相互作用形成了碳化钴。GO不仅为碳化钴提供了碳源，而且还充当空心结构的软模板并促进了活性物质的分布。所得样品比主要由CoO / Co /碳化钴/ RGO组成的高温（500°C和600°C）制备的催化剂具有更高的染料敏化光催化H ₂放出活性。这种增强的活性归因于高度分散的碳化钴和Co ₂（OH）₃ Cl的形成，它们之间的有效电子转移以及Co ₂（OH）₃ Cl有效地从激发的染料分子传递电子的能力。染料敏化光催化H ₂的最高表观量子产率使用我们的催化剂在420 nm处的放出率为28.3％。还讨论了可能的机制。

更新日期：2020-11-03

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