A hybrid CoOOH-rGO/Fe2O3 photoanode with spatial charge separation and charge transfer for efficient photoelectrochemical water oxidation

Chong, Ruifeng; Wang, Zhenzhen; Lv, Jiaqi; Rong, Jiayue; Zhang, Ling; Jia, Yushuai; Wang, Li; Chang, Zhixian; Wang, Xiang

doi:10.1016/j.jcat.2021.05.006

Title: A hybrid CoOOH-rGO/Fe₂O₃ photoanode with spatial charge separation and charge transfer for efficient photoelectrochemical water oxidation

Journal Article · Wed May 19 00:00:00 EDT 2021 · Journal of Catalysis

DOI:https://doi.org/10.1016/j.jcat.2021.05.006· OSTI ID:1863316

^[1]; Wang, Zhenzhen ^[1]; Lv, Jiaqi ^[1]; Rong, Jiayue ^[1]; Zhang, Ling ^[1];

^[2]; Wang, Li ^[1]; Chang, Zhixian ^[1]; Wang, Xiang ^[3]

Henan Univ., Kaifeng (China). Henan Joint International Research Laboratory of Environmental Pollution Control Materials, Henan Provincial Engineering Research Center of Green Anticorrosion Technology for Magnesium Alloys
Jiangxi Normal Univ., Nanchang (China). Inst. of Advanced Materials
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

As a promising photoanode for photoelectrochemical (PEC) water oxidation, hematite (Fe₂O₃) still suffers from poor charge mobility and serious charges recombination and sluggish surface oxygen evolution kinetics. Herein, a hybrid photoanode of cobalt (oxy)hydroxide coupled with reduced graphene oxide modified Fe₂O₃ (CoOOH-rGO/Fe₂O₃) is well crafted by a facile hydrothermal synthesis with a chelation-mediated in-situ growth method. Morphology characterizations indicate rGO forms the internal network among isolated Fe₂O₃ and CoOOH nanosheets distribute on the terminal of Fe₂O₃, forming a spatial separated nanostructure. The resultant CoOOH-rGO/Fe₂O₃ exhibits an obviously reduced onset potential of ca. 150 mV and a significantly enhanced photocurrent density of 2.56 mA cm^-2 at 1.23 V, which is ca. 3.3 times higher than that of bare Fe₂O₃. Especially, the functions of rGO and CoOOH are studied by using electrochemical impedance spectroscopy, open circuit potentials and intensity modulated photocurrent spectroscopy. It is found rGO act as conductive network which facilitates the electron transfer from Fe₂O₃ to the substrate, while CoOOH evidently passivate the surface states of Fe₂O₃, improve charge separation and provide catalytic active sites for water oxidation. Additionally, the spatial charge separation and charge transfer caused by CoOOH and rGO are responsible for the enhanced PEC performance of water oxidation. The rational design and the facile fabrication strategy exhibit great potential to be used for other PEC system with great efficiency.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Natural Sciences Foundation of China (NSFC)zx

Grant/Contract Number:: AC05-00OR22725; U2004195; 51502078

OSTI ID:: 1863316

Journal Information:: Journal of Catalysis, Vol. 399, Issue 1; ISSN 0021-9517

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Hematite
Photoelectrochemical water oxidation
Charge transfer
Charge separation

Title: A hybrid CoOOH-rGO/Fe2O3 photoanode with spatial charge separation and charge transfer for efficient photoelectrochemical water oxidation

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Title: A hybrid CoOOH-rGO/Fe₂O₃ photoanode with spatial charge separation and charge transfer for efficient photoelectrochemical water oxidation