用于光化学和电化学应用的 g-C3N4/Co 纳米复合材料的三维纳米结构,ACS Applied Nano Materials

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用于光化学和电化学应用的 g-C3N4/Co 纳米复合材料的三维纳米结构
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-08-11 , DOI: 10.1021/acsanm.2c02755
Xingshuai Ji ₁ , Baogang Xu ₁ , Hongyu Zhang ₁ , Xiang Xia ₁ , Kang Ji ₁ , Alicja Szymska ₂ , Katarzyna Matras-Postolek ₂ , Ping Yang ₁

Affiliation

在高温热聚合过程中引入钴离子以制备图形氮化碳（gC ₃ N ₄）和Co复合材料。Co离子诱导的界面工程导致复合样品的形态以及光和电化学性能的变化。Co-gC ₃ N ₄复合样品分别在 680 和 750 °C 下显示出优异的薄纳米片和纳米管形态。作为分离中心，界面处的 Co-N 键促进了电荷的转移并改善了光催化性能。因此，Co-gC ₃ N ₄复合纳米片显示出最好的光催化性能，罗丹明B的最大降解速率常数达到0.126 min ^-1，是纯gC ₃ N ₄纳米片的9.7倍。相比之下，具有Co纳米颗粒的Co-gC ₃ N ₄复合纳米管有效地增强了析氢反应。在电流密度为10 mA cm ^-2的情况下，Co-gC ₃ N ₄复合纳米管的过电位为249 mV，Tafel斜率为80 mV dec ^-1。此外，Co-gC ₃ N ₄复合纳米管显示出作为超级电容器的高充放电容量。该结果提供了一种构建 gC ₃ N ₄基光和电催化剂的方法，用于各种光和电化学应用，包括有机污染物的光催化降解、电催化析氢反应和超级电容器。

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Dimensional Nanoarchitectonics of g-C3N4/Co Nanocomposites for Photo- and Electro-Chemical Applications

Cobalt ions were introduced during thermal polymerization at high temperature to prepare graphic carbon nitride (g-C₃N₄) and Co composites. The interface engineering induced by Co ions resulted in the variation of morphology as well as photo- and electro-chemical performance of the composite samples. Co-g-C₃N₄ composite samples revealed superior thin-nanosheet and nanotube morphologies at 680 and 750 °C, respectively. As separation centers, Co–N bonds at the interface promoted the transfer of charges and improved photocatalytic properties. Thus, the Co-g-C₃N₄ composite nanosheets revealed the best photocatalytic performance, in which the maximum degradation rate constant of rhodamine B reached to 0.126 min^–1, which was 9.7 times of that of pure g-C₃N₄ nanosheets. In contrast, the Co-g-C₃N₄ composite nanotubes with Co nanoparticles effectively enhanced the hydrogen evolution reaction. In the case of a current density of 10 mA cm^–2, the overpotential of the Co-g-C₃N₄ composite nanotubes was 249 mV and the Tafel slope was 80 mV dec^–1. In addition, the Co-g-C₃N₄ composite nanotubes revealed high charge–discharge capacity as a supercapacitor. This result provided a method for building g-C₃N₄-based photo- and electro-catalysts for various photo- and electro-chemical applications including photocatalytic degradation of organic pollutants, electrocatalytic hydrogen evolution reaction, and supercapacitors.

更新日期：2022-08-11

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