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Received October 26, 2020
Accepted January 26, 2021
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Engineering of cobalt oxide-integrated nitric acid-functionalized Zr-Fe2O3 nanocoral photoanodes for photoelectrochemical water splitting

Division of Biotechnology, Safety, Environment and Life Science Institute, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 54596, Korea 1Daegu Center, Korea Basic Science Institute, Daegu 41566, Korea 2Advanced Physics Laboratory, Department of Physics, Savitribai Phule Pune University, Pune-411007, India
mahadeomahadik@gmail.com
Korean Journal of Chemical Engineering, June 2021, 38(6), 1149-1160(12), 10.1007/s11814-021-0750-3
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Abstract

A strategy involving CoOx catalyst adsorption and acid treatment for modifying the surface properties of Zr-doped hematite nanocoral (NC) photoanodes has been proposed. Acid-treated Zr-Fe2O3 NCs exhibited a reduced electrode/electrolyte interface resistance and improved surface charge-injection efficiency. X-ray photoelectron spectroscopy data confirmed an increased number of hydroxy groups and the formation of Fe2+ sites on the surface of the acidtreated Zr-Fe2O3 NC, suggesting surface amendment. Furthermore, after surface amendment with a 1mM Co(OAc)2 solution, the CoOx encapsulated acid-treated Zr-Fe2O3 NC photoanode exhibited a photocurrent density of 1.83mA/ cm2 at 1.23 V vs. RHE, following a 200-mV cathodic shift in the photocurrent onset compared with the bare Zr-Fe2O3 NC. The experimental results indicated the efficacy of acid treatment and CoOx adsorption for reducing the surface state and enhancing the photoelectrochemical water-oxidation performance. The acid-treatment step in the CoOxencapsulated acid-treated Zr-Fe2O3 NC provided a CoOx catalyst adsorption bond and permitted the kinetics of the charge-transfer process. This synergistic strategy of acid treatment and CoOx adsorption for enhancing the PEC performance provides a reference for accelerating the charge separation for other photoelectrodes.

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