Journal
DALTON TRANSACTIONS
Volume 50, Issue 43, Pages 15551-15557Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt02303a
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Funding
- Natural Science Foundation of China [51572106, 21773086, 21870063]
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In this study, an NiFeSx-decorated Ti-Fe2O3 photoanode was synthesized using a simple electrodeposition method, leading to improved photocurrent density and onset potential. The true effects of NiFeSx as a cocatalyst for enhancing PEC performance were analyzed using surface photovoltage spectroscopy and other techniques. This work provides a simple method for modifying a Ti-Fe2O3 photoanode for PEC water oxidation with a low-cost and efficient cocatalyst.
Decorating a high-efficiency oxygen evolution reaction (OER) electrocatalyst as a cocatalyst on an alpha-Fe2O3 photoanode is known to be one of the most efficient methods to improve the photoelectrochemical (PEC) water oxidation activity. In our work, different from traditional methods of transition metal sulfide cocatalyst synthesis, an NiFeSx-decorated Ti-Fe2O3 photoanode is synthesized through a simple one-step electrodeposition method, which benefits the interface between Ti-Fe2O3 and NiFeSx. With the help of this excellent OER electrocatalyst, the photocurrent density of the NiFeSx-Ti-Fe2O3 photoanode rises to 3 mA cm(-2) at 1.23 V vs. RHE, which is 2.5 times greater than the photocurrent of Ti-Fe2O3. Moreover, the onset potential of NiFeSx-Ti-Fe2O3 shifts negatively by 170 mV compared with that of pure Ti-Fe2O3. Furthermore, surface photovoltage spectroscopy (SPV) and transient photovoltage (TPV) techniques and photoelectrochemical impedance spectroscopy (PEIS) were used to analyze the true effects of NiFeSx as an efficient cocatalyst for enhancing the PEC performance of the NiFeSx-Ti-Fe2O3 photoanode. This work provides a simple method for loading a low-cost and efficient cocatalyst to modify a Ti-Fe2O3 photoanode for the PEC water oxidation reaction.
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