Investigation shows enhanced PbO2 stability and electrocatalytic activity in trifluoromethanesulfonic acid baths, indicating improved electrode performance.
The preparation of Ti/SnO2-Sb/PbO2 electrode by electrodeposition in trifluoromethanesulfonic acid (TfOH) bath was investigated. The composition of the PbO2 films is dominated by β-phase, and the preferential orientation of β (3 0 1) plane as well as the enhanced crystalline refinement are observed with increasing both TfOH concentration in the bath and deposition current density. It is demonstrated that non-stoichiometric lead dioxide is deposited on the substrates in the TfOH baths. The electrocrystallization of PbO2 from the TfOH bath follows the typical instantaneous nucleation mechanism. The PbO2 electrodes deposited from the TfOH baths exhibit superior stability. The accelerated lifespan of the electrode deposited under the optimal conditions (0.5 M TfOH and 10 mA/cm2) reaches 129 h, 4.0 times that of the conventional nitrate bath. Furthermore, the PbO2 anode exhibits the higher electrocatalytic activity for methyl orange removal relative to the electrode prepared in the nitrate bath, which is attributed to the larger active specific surface area.
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Zhang et al. (2025) studied this question.
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