Cocreation of photogenerated electron and hole collectors on polymeric carbon nitride synergistically promotes carrier separation and reaction kinetics towards propelling photocatalytic hydrogen evolution

Jiaming Li; Jinlong Han; Xiyue Zou; Na Xu; Fang Gu; Nan Su; Chunmei Li; Hongjun Dong

doi:10.1016/j.jcis.2024.04.071

Cocreation of photogenerated electron and hole collectors on polymeric carbon nitride synergistically promotes carrier separation and reaction kinetics towards propelling photocatalytic hydrogen evolution

J Colloid Interface Sci. 2024 Aug:667:101-110. doi: 10.1016/j.jcis.2024.04.071. Epub 2024 Apr 12.

Authors

Jiaming Li¹, Jinlong Han², Xiyue Zou², Na Xu³, Fang Gu⁴, Nan Su², Chunmei Li², Hongjun Dong⁵

Affiliations

¹ College of Chemistry, Jilin Normal University, Siping 136000, PR China; Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
² Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
³ College of Chemistry, Jilin Normal University, Siping 136000, PR China. Electronic address: xuna8912@126.com.
⁴ School of Food Engineering, Harbin University of Commerce, Harbin 150028, PR China. Electronic address: gufangwell@126.com.
⁵ Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China. Electronic address: donghongjun6698@aliyun.com.

PMID: 38621332
DOI: 10.1016/j.jcis.2024.04.071

Abstract

It is a challenging issue for the creation of photogenerated carrier collectors on the photocatalyst to drive charge separation and promote reaction kinetics in the photocatalytic reaction. Herein, based on one-step dual-modulation strategy, IrO₂ nanodots are modified at the edge of polymeric carbon nitride (PCN) nanosheets and atomically dispersed Ir atoms are implanted in the skeleton of PCN to obtain a unique Ir-PCN/IrO₂ photocatalyst. IrO₂ nanodots and atomically dispersed Ir atoms act as hole and electron collectors to synergistically promote the carrier separation and reaction kinetics, respectively, thereby greatly improving the photocatalytic hydrogen evolution (PHE) performance. As a result, without adding additional cocatalyst, the PHE rate over the optimal Ir-PCN/IrO₂-2% sample reaches up to 1564.4 μmol h^-1 g^-1 under the visible light irradiation, with achieving an apparent quantum yield (AQY) of 15.7% at 420 nm.

Keywords: Dual-modulation strategy; Electron and hole collectors; Photocatalytic hydrogen evolution; Polymeric carbon nitride; Without additional cocatalysts.