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Tailoring the properties of oxygenated graphene with different oxidation degrees for noble-metal-free photocatalytic hydrogen evolution
Catalysis Today ( IF 5.3 ) Pub Date : 2018-04-12 , DOI: 10.1016/j.cattod.2018.04.009
Lutfi K. Putri , Boon-Junn Ng , Kok Hong Tan , Fang Sheng Lim , Wee-Jun Ong , Wei Sea Chang , Siang-Piao Chai

This present work demonstrates the integration of oxygen atoms into the graphene matrix to develop graphene oxide (GO) with tailored oxidation degrees which render them as photoactive materials for hydrogen (H2) evolution. GO photocatalysts derived from the modified Hummer’s method can endow tunable optical and electronic properties by varying the oxidation level into three increasing degrees GO-0.33, GO-0.47 and GO-0.53. Absorption spectroscopy revealed the increasing band gap of GO with respect to increasing oxygen contents and XRD, Raman and AFM studies revealed transformation in properties with increasing degree of oxygenated graphene. As opposed to graphite or graphene which is not photoresponsive, all GO samples exhibited photocatalytic activity towards H2 generation in sacrificial systems containing 0.1 M Na2S/Na2SO3. Among the studied samples, GO with intermediate O/C ratio of 0.47 (GO-0.47) exhibited the highest H2 photoactivity of 1104.3 μmolg−1h−1 after of light irradiation, owing to the presence of optimal oxygen loading content in GO. The study reveals that mere chemical modification by oxygen groups on the graphene can confer photocatalytic properties whose activity is further adjustable by modification in the oxygen level.



中文翻译:

量身定制不同氧化度的氧化石墨烯的无贵金属光催化制氢性能

这项工作证明了氧原子整合到石墨烯基体中,可以开发出具有特定氧化度的氧化石墨烯(GO),从而使其成为氢(H 2)释放的光敏材料。源自改良的Hummer方法的GO光催化剂可通过将氧化程度更改为三个递增程度GO-0.33,GO-0.47和GO-0.53而赋予可调节的光学和电子性质。吸收光谱表明,GO的带隙随氧气含量的增加而增加,XRD,拉曼和AFM研究表明,随着氧化石墨烯程度的增加,性能发生了转变。与不具有光响应性的石墨或石墨烯相反,所有GO样品均表现出对H 2的光催化活性。含有0.1 M Na 2 S / Na 2 SO 3的牺牲体系中的生成。在研究的样品中,由于GO中存在最佳的氧含量,中等O / C比为0.47的GO(GO-0.47)在光照射后表现出最高的H 2光活性为1104.3μmolg- 1 h -1。研究表明,仅通过石墨烯上的氧基团进行化学修饰即可赋予光催化性能,其活性可通过氧含量的修饰进一步调节。

更新日期:2018-04-12
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