Tian Lin, Chen Hongyu, Lu Xinhua, Liu Dongsheng, Cheng Wenjing, Liu Yuanyuan, Li Jing, Li Zhao
School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China; University and College Key Lab of Natural Product Chemistry and Application in Xinjiang, School of Chemistry and Environmental Science, Yili Normal University, Yining 835000, China; Key Laboratory of Pollutant Chemistry and Environmental Treatment, School of Chemistry and Environmental Science, Yili Normal University, Yining 835000, China.
School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
J Colloid Interface Sci. 2022 Dec 15;628(Pt A):663-672. doi: 10.1016/j.jcis.2022.07.125. Epub 2022 Jul 22.
Solar-assisted electrocatalytic oxygen evolution reaction (OER) plays a key role in energy conversion and storage technology. Herein, we provide the novel design and synthesis of an advanced category of CeO/CoS heterostructures, which combines the local photothermal effect (LPTE) action of CeO and the photoelectric effect CoS to boost OER. Interestingly, the hollow framework, rich heterointerface, coupled local photothermal effect and photoelectric effect equip CeO/CoS with remarkably excellent electrocatalytic OER performance. As a result, the optimized CeO/CoS-6 only needs an overpotential of 283 mV to reach 10 mA cm as well as a smaller Tafel slop of 33.2 mV dec, outperforming the RuO catalyst (323 mA @ 10 mA cm). Upon combination of experimental data and mechanistic study, it is revealed that the enhanced OER performance is primarily ascribed to the photo-induced local thermal. partly resulting from photoelectric effect, where the photogenerated electron flow from CeO to CoS can photogenerated holes in CeO to boost water oxidation. This work is extremely expected to offer a novel avenue for the rational design and fabrication of outstanding OER electrocatalysts upon LPTE.
太阳能辅助电催化析氧反应（OER）在能量转换和存储技术中起着关键作用。在此，我们提供了一种新型的CeO/CoS异质结构的设计与合成，它结合了CeO的局域光热效应（LPTE）作用和CoS的光电效应来促进OER。有趣的是，中空框架、丰富的异质界面、耦合的局域光热效应和光电效应使CeO/CoS具有非常优异的电催化OER性能。结果，优化后的CeO/CoS-6在达到10 mA cm时仅需283 mV的过电位以及33.2 mV dec的较小塔菲尔斜率，优于RuO催化剂（在10 mA cm时为323 mV）。结合实验数据和机理研究表明，OER性能的增强主要归因于光诱导局部热效应，部分源于光电效应，其中从CeO流向CoS的光生电子可在CeO中产生光生空穴以促进水氧化。这项工作极有望为基于LPTE合理设计和制备优异的OER电催化剂提供一条新途径。
