Facile growth of novel morphology correlated Ag/Co-doped ZnO nanowire/flake-like composites for superior photoelectrochemical water splitting activity
- Authors
- Sreedhar, Adem; Reddy, I. Neelakanta; Ta, Qui Thanh Hoai; Namgung, Gitae; Cho, Eunbin; Noh, Jin-Seo
- Issue Date
- 15-Apr-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Films; Composites; Optical properties; ZnO; Electrodes
- Citation
- CERAMICS INTERNATIONAL, v.45, no.6, pp.6985 - 6993
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 45
- Number
- 6
- Start Page
- 6985
- End Page
- 6993
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1579
- DOI
- 10.1016/j.ceramint.2018.12.198
- ISSN
- 0272-8842
- Abstract
- In this paper, novel morphology correlation between silver nanowires (AgNWs) and cobalt (Co)-doped ZnO (Co-ZnO) flake-like thin films (nanowire/flake-like) has been proposed for enhanced photoelectrochemical (PEC) water splitting activity. Here in, high-quality AgNWs/Co-ZnO heterostructures enabled superior visible light water splitting activity compared to the pure ZnO and AgNWs/ZnO. To address the strategic effect of AgNWs coupling and transition metal (Co-2 at%) doping into the ZnO host lattice, we have carried out the X-ray diffraction, field emission scanning microscopy, X-ray photoelectron spectroscopy, UV-Vis transmittance, water contact angle and PEC analyses. In this way, PEC water splitting activity was mainly examined by linear sweep voltammetry (I-V), amperometric I-t and photoconversion efficiency (ii) studies. The experimental results provide clear evidence of morphology correlation between AgNWs and Co-ZnO flake-like structures for strong visible light absorption. Specifically, AgNWs/Co-ZnO composites exhibited significant enhancement in the photocurrent density (7.0 x 10(-4) A/cm(2)) than AgNWs/ZnO (3.2 x 10(-4) A/cm(2)) and pure ZnO (1.5 x 10(-6) A/cm(2)). As a result, detailed AgNWs/Co-ZnO geometry has great potential for photoconversion efficiency (0.73%). In a word, the merits of controllable AgNWs/Co-ZnO heterostructure are proposed to improve the visible light harvesting and charge carrier generation for energy conversion devices.
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