Ultra-high oxidation potential of Ti/CuSnO2 anodes fabricated by spray pyrolysis for wastewater treatment

• The Ti/CuSnO2 anodes have an ultra-high oxidation potential of about 2.7 V vs NHE.
• Cu doped SnO2 exhibits the preferred orientation along (110).
• Fermi energy level of CuSnO2 decreases with the Cu concentration.
• Work function of CuSnO2 increases with the Cu concentration.

High oxidation potential indicates anodes have high oxidation power and high current efficiency for organics oxidation. In this paper, we prepared Ti/CuSnO2 anodes using spray pyrolysis method. The Ti/CuSnO2 anodes have an ultra-high oxidation potential of about 2.7 V vs NHE, suitable for use in wastewater treatment. The Ti/CuSnO2 anodes exhibit the preferred orientation along (110) plane at high Cu doped concentration. First-principles calculations suggest that work function of CuSnO2 increases with the Cu doping concentration. It is obtained that the preferred (110) plane and the high work function are responsible for the enhanced oxidation potential of Ti/CuSnO2 anodes.

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