Jump to main content
Jump to site search

Issue 30, 2013
Previous Article Next Article

Sunlight-driven Ag–AgCl1–xBrx photocatalysts: enhanced catalytic performances via continuous bandgap-tuning and morphology selection

Author affiliations

Abstract

The solid solution (SS) method is an effective way to design impactful photocatalysts, owing to its merit of continuous bandgap-tuning. A calcination, usually breaking the morphology of a material, has to be used to synthesize such catalysts, although the morphology is a critical issue affecting its catalytic behavior. It thus is strongly desired to construct SS-based catalysts with a shaped morphology. Here, we report that AgCl1–xBrx SS-based photocatalysts, Ag–AgCl1–xBrx, with a shaped morphology, can be produced via an ion-exchange between nanostructured Ag–AgCl and KBr. It is found that when sphere-like Ag–AgCl is employed as a precursor, the Ag–AgCl1–xBrx, maintains its morphology when x is in the range of 0–1. The bandgap, and the catalytic activities of these Ag–AgCl1–xBrx for the degradation of methyl orange, display a monotonic narrowing and a continuous enhancement, respectively, with the increase of x. In contrast, when cube-like Ag–AgCl is used as a precursor, the Ag–AgCl1–xBrx preserves its morphological features when x ≤ 0.5, while a morphology distortion is observed when x ≥ 0.75. Fascinatingly, although the bandgap of thus-constructed Ag–AgCl1–xBrx also exhibits a monotonic narrowing with the increase of x, they (x ≠ 0, 1) display enhanced catalytic activity compared with the two terminal materials, Ag–AgCl and Ag–AgBr, wherein Ag–AgCl0.5Br0.5, with a cube-like morphology, shows the highest catalytic performance. The synergistic effect of morphology selection and bandgap narrowing plays an important role for these intriguing new findings. Our work provides a unique forum for an optimized selection of SS-based photocatalysts in terms of morphology selection and bandgap-tuning.

Graphical abstract: Sunlight-driven Ag–AgCl1–xBrx photocatalysts: enhanced catalytic performances via continuous bandgap-tuning and morphology selection

Back to tab navigation

Supplementary files

Publication details

The article was received on 21 Apr 2013, accepted on 21 May 2013 and first published on 21 May 2013


Article type: Paper
DOI: 10.1039/C3CP51707A
Citation: Phys. Chem. Chem. Phys., 2013,15, 12709-12716
  •   Request permissions

    Sunlight-driven Ag–AgCl1–xBrx photocatalysts: enhanced catalytic performances via continuous bandgap-tuning and morphology selection

    M. Zhu, C. Chen, P. Chen, B. Lei, W. Ma and M. Liu, Phys. Chem. Chem. Phys., 2013, 15, 12709
    DOI: 10.1039/C3CP51707A

Search articles by author

Spotlight

Advertisements