Issue 3, 2022

Robust charge carrier engineering via plasmonic effect and conjugated Π-framework on Au loaded ZnCr-LDH/RGO photocatalyst towards H2 and H2O2 production

Abstract

In the present investigation, we examined the water and oxygen reduction ability of ZnCr-layered double hydroxide decorated with Au nanoparticles and reduced graphene oxide, prepared via in situ crystallization and photoreduction method. The fabricated Au@LDH/RGO composite was well characterized by different analytical instruments like PXRD, FTIR, Raman, XPS, EDX, FESEM, and TEM, suggesting strong interaction between the components of the ternary hybrid. Further, the Au@LDH/RGO catalyst shows the best hydrogen evolution reaction (HER), i.e., 918.76 μmol/2 h (no. evolved H2 gas is 4.9903 × 1015 cm−2 s−1) with an ACE of 10.5% and excellent reusability up to 8 h with little change in activity. Additionally, the ternary nanohybrid depicts robust photocatalytic O2 reduction reaction performance, i.e., 24.3 μmol/2 h of H2O2 (SCC = 0.23%), which goes via a superoxide radical mechanism as confirmed through tracing experiments. The observed high photocatalytic activity is attributed to the synergetic effect of both plasmonic Au nanoparticles and conjugated Π-skeleton of RGO, which resulted in high charge carrier density and reduction of the recombination process. This observation is well justified by Mott–Schottky, EIS, PL, and photocurrent measurements. Further, the HER performance was also tested under different hole scavengers to figure out their effect. The SPR effect of Au and conjugated cyclic carbon network of RGO plays a pivotal part in improving the H2 and H2O2 generation ability of LDH under visible light illumination.

Graphical abstract: Robust charge carrier engineering via plasmonic effect and conjugated Π-framework on Au loaded ZnCr-LDH/RGO photocatalyst towards H2 and H2O2 production

Supplementary files

Article information

Article type
Research Article
Submitted
10 Oct 2021
Accepted
03 Dec 2021
First published
07 Jan 2022

Inorg. Chem. Front., 2022,9, 559-576

Robust charge carrier engineering via plasmonic effect and conjugated Π-framework on Au loaded ZnCr-LDH/RGO photocatalyst towards H2 and H2O2 production

S. Mansingh, D. P. Sahoo, L. Paramanik, M. Sahoo and K. Parida, Inorg. Chem. Front., 2022, 9, 559 DOI: 10.1039/D1QI01284C

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