Abstract
In this work, a novel polyoxometalate template-based strategy was applied to construct the bi-metal-doped CdS photocatalysts. NiMo6 polyoxometalate template precursor was applied for the preparation of Ni, Mo co-doped CdS photocatalysts (NiMo-CdS). The structures of the materials were explored by XRD, SEM, HRTEM, HAADF, element mapping, XPS, Raman spectrum and UV-vis DRS. Moreover, the results of the UV-vis spectrum showed that NiMo-CdS exhibited an enhanced performance on light absorption. The results of photocatalytic hydrogen evolution from water splitting demonstrated that the NiMo-CdS showed higher efficiency on hydrogen evolution than noble-metal Pt-doped CdS. The reason could be ascribed to the enhanced light absorption ability and charge separation after Ni and Mo were introduced, which could also act as co-catalysts. The apparent quantum yield (AQY) efficiency could reach 42% at 365 nm. This work proposed a novel and inexpensive method to synthesize the bi-metal (Ni, Mo) decorated CdS photocatalysts for efficient hydrogen evolution from water splitting.
Highlights
Photocatalytic water splitting has been proposed since Honda and Fujishima first reported it in1972 [1]
The crystalline structure of Ni and Mo species was still uncertain from the above X-ray diffraction (XRD) patterns, and hereafter, identified by X-ray photoelectron spectrum (XPS) measurements that will be discussed later
The morphology characterizations of x%(NiMo6 )@CdS-24 h were investigated by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) as depicted in Figures 2a–i and 3a–g, respectively
Summary
Photocatalytic water splitting has been proposed since Honda and Fujishima first reported it in. Afterward, it ignited a majority of interests in photocatalytic water splitting for hydrogen production. Past decades have witnessed the development of photocatalysis on the materials and the intrinsic mechanisms [2,3,4,5]. TiO2 was regarded as one of the most traditional materials [6,7,8]. The limitations constrained its application since it could only absorb the UV-light that occupied only 4% of the full arc solar spectrum. It was urgent to explore the novel materials which could absorb the irradiation light from a wide range, like visible light, or even infrared light
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