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Developing hierarchical CdS/NiO hollow heterogeneous architectures for boosting photocatalytic hydrogen generation

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Abstract

The hierarchical binary CdS/NiO hollow heterogeneous architectures (HHAs) with p-n heterojunction are constructed by a facile microwave-assisted wet chemical process for high-efficient photocatalytic hydrogen evolution reaction (HER) from water. The asdesigned CdS/NiO HHAs are composed of hexagonal n-type CdS nanoparticles with a size in the range of 20–40 nm attaching to cubic p-type NiO hollow microspheres (HMSs) which are aggregates of porous nanoplates with a thickness of about 20 nm. The photocatalytic water splitting over CdS/NiO HHAs is significantly increased under simulated solar irradiation, among which the most active sample of CdS/NiO-3 (the mass ratio of CdS to NiO is 1:3) exhibits the fastest photocatalytic HER rate of 1.77 mmol·g−1·h−1, being 16.2 times than that of pure CdS. The boosted photocatalytic HER could be attributed to the synergistic effect on the proportional p-n heterojunction with special hierarchical hollow and porous morphology, an enhancement of visible light absorption, and an improvement of photoinduced charge separation as well as the photo-stability given by the composite heterojunction. This work shows a viable strategy to design the heterojunction with special morphology for the efficient hydrogen generation by water splitting utilizing solar energy.

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Acknowledgments

The authors thank the financial supports from the National Natural Science Foundation of China (Nos. 21978298, U1862117, and 91534123), the Open Foundation of Anhui Province Key Laboratory of Advanced Building Materials (No. JZCL002KF), the Natural Science Foundation of Anhui Province (No. 1808085MB40), the Key Projects of Research and Development Program of Anhui Provence (No. 201904bll020040), the Major Program of Science and Technology Foundation of Anhui Province (No. 201903a05020044), the Natural Science Foundation of Anhui Province Educational Committee (No. KJ2019A0773), and the Doctoral Foundation of Anhui Jianzhu University (Nos. 2019QDZ65 and 2019QDZ23).

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  1. School of Energy Materials and Chemical Engineering, Hefei University, Hefei, 230601, China

    Chonghai Deng, Fan Ye, Tao Wang, Xiaohui Ling, Lulu Peng & Qiang Dong

  2. Anhui Province Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, 230601, China

    Hong Yu, Kangzhe Ding & Hanmei Hu

  3. The Future Lab, Tsinghua University, Beijing, 100084, China

    Huirong Le

  4. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Yongsheng Han

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Deng, C., Ye, F., Wang, T. et al. Developing hierarchical CdS/NiO hollow heterogeneous architectures for boosting photocatalytic hydrogen generation. Nano Res. 15, 2003–2012 (2022). https://doi.org/10.1007/s12274-021-3960-4

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