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Issue
Korean Journal of Chemical Engineering,
Vol.38, No.6, 1149-1160, 2021
Engineering of cobalt oxide-integrated nitric acid-functionalized Zr-Fe2O3 nanocoral photoanodes for photoelectrochemical water splitting
Hwang JB, Kim SR, Chae WS, Pathan HM, Mahadik MA, Jang JS
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.
Keywords: CoOx Adsorption; Nitric Acid Treatment; Zr-doped Hematite Nanocorals; Photoelectrochemical Water Oxidation
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