Interfacial growth of the optimal BiVO 4 nanoparticles onto self-assembled WO 3 nanoplates for efficient photoelectrochemical water splitting.

Autor: Kumbhar VS; School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongbuk, South Korea; Research Institute of Environmental Science & Technology, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, South Korea., Lee H; School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongbuk, South Korea; Research Institute of Environmental Science & Technology, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, South Korea., Lee J; School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongbuk, South Korea; Research Institute of Environmental Science & Technology, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, South Korea., Lee K; School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongbuk, South Korea; Research Institute of Environmental Science & Technology, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, South Korea. Electronic address: kiyoung@knu.ac.kr.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2019 Dec 01; Vol. 557, pp. 478-487. Date of Electronic Publication: 2019 Sep 11.
DOI: 10.1016/j.jcis.2019.09.037
Abstrakt: Photoelectrochemical water splitting is the most efficient green engineering approach to convert the sun light into hydrogen energy. The formation of high surface area core-shell heterojunction with enhanced light-harvesting efficiency, elevated charge separation, and transport are key parameters in achieving the ideal water splitting performance of the photoanode. Herein, we demonstrate a first green engineering interfacial growth of the BiVO 4 nanoparticles onto self-assembled WO 3 nanoplates forming WO 3 /BiVO 4 core-shell heterojunction for efficient PEC water splitting performance. The three different WO 3 nanostructures (nanoplates, nanobricks, and stacked nanosheets) were self-assembled on fluorine doped tin oxide glass substrates via hydrothermal route at various pH (0.8-1.2) of the solutions. In comparison to nanobricks and stacked nanosheets, WO 3 nanoplates displayed considerably elevated photocurrent density. Moreover, a simple and low cost green approach of modified chemical bath deposition technique was established for the optimal decoration of a BiVO 4 nanoparticles on vertically aligned WO 3 nanoplates. The boosted photoelectrochemical current density of 1.7 mA cm -2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination was achieved for the WO 3 /BiVO 4 heterojunction which can be attributed to a suitable band alignment for the efficient charge transfer from BiVO 4 to WO 3 , increased light harvesting capability of outer BiVO 4 layer, and high charge transfer efficiency of WO 3 nanoplates.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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