Preparation of double-layered Co−Ci/NiFeOOH co-catalyst for highly meliorated PEC performance in water splitting

Xingsheng Hu; Yan Li; Xinxin Wei; Lei Wang; Houde She; Jingwei Huang; Qizhao Wang

Advanced Powder Materials (Jul 2022)

Preparation of double-layered Co−Ci/NiFeOOH co-catalyst for highly meliorated PEC performance in water splitting

Xingsheng Hu,
Yan Li,
Xinxin Wei,
Lei Wang,
Houde She,
Jingwei Huang,
Qizhao Wang

Affiliations

Xingsheng Hu: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
Yan Li: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
Xinxin Wei: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
Lei Wang: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
Houde She: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
Jingwei Huang: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
Qizhao Wang: Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China; School of Environmental Science and Engineering, Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of Education, Chang'an University, Xi'an 710054, China; Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, Tianjin 300384, China; Corresponding author. Gansu International Scientific and Technological Cooperation Base of Water–Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.

Journal volume & issue: Vol. 1, no. 3
p. 100024

Abstract

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The cobalt−carbonate (CoCi)/NiFeOOH double-layer co-catalyst was prepared on bismuth vanadate (BiVO4). Compared with the same type of electrode (Co−Pi/NiFeOOH/BiVO4 and Co−Sil/NiFeOOH/BiVO4), the photoelectrochemical (PEC) performance of the composite electrode presents the most excellent performance. The Co−Ci/NiFeOOH/BiVO4 electrode prepared by photoelectric deposition (PED) achieves a photocurrent density of 4.1 mA/cm2 at 1.23 V vs RHE, and the applied bias photon-current efficiency (ABPE) is up to 0.95%. In addition, with the help of the equivalent circuit fitting in electrochemical impedance spectroscopy (EIS), the charge transfer resistance (Rct) of Co−Ci/NiFeOOH/BiVO4 is only 108.9 Ω, which is 16% that of BiVO4. The enhanced PEC performance of Co−Ci/NiFeOOH/BiVO4 in the double-layer cocatalyst system is attributed to the outstanding advantages of Co−Ci cocatalyst in oxygen vacancy defects, superior to other cobalt-based catalysts in promoting charge transfer and improving the kinetics of water oxidation. This makes Co−Ci co-catalyst become one of the favorable competitors in the field of photoelectric catalysis.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

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