Facile Synthesis of PdO.TiO2 Nanocomposite for Photoelectrochemical Oxygen Evolution Reaction

Abstract

The rapid depletion of fossil fuels and environmental pollution has motivated scientists to cultivate renewable and green energy sources. The hydrogen economy is an emerging replacement for fossil fuels, and photocatalytic water splitting is a suitable strategy to produce clean hydrogen fuel. Herein, the photocatalyst (PdO.TiO2) is introduced as an accelerated photoelectrochemical oxygen evolution reaction (OER). The catalyst showed significant improvement in the current density magnitude from 0.89 (dark) to 4.27 mA/cm2 (light) during OER at 0.5 V applied potential. The as-synthesized material exhibits a Tafel slope of 170 mVdec−1 and efficiency of 0.25% at 0.93 V. The overall outcomes associated with the photocatalytic activity of PdO.TiO2 demonstrated that the catalyst is highly efficient, thereby encouraging researchers to explore more related catalysts for promoting facile OER.

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“…Fortunately, there are more and more papers claiming that transition metal oxides, sulfides, selenides, nitrides, phosphides, and other compounds are also extremely effective OER catalysts. [17][18][19][20] After careful examination, it is believed that mixed metal oxides are more potent and active than single metal oxides (Table 1). Typically, the metal salts of the mixed metals are thermally decomposed to produce the mixed metal oxides.…”

“…Numerous attempts have been pushed to look for novel electrocatalysts based on noble metals free components in order to speed up the commercialization of electrocatalytic water splitting and reduce its industrial cost. Fortunately, there are more and more papers claiming that transition metal oxides, sulfides, selenides, nitrides, phosphides, and other compounds are also extremely effective OER catalysts [17–20] . After careful examination, it is believed that mixed metal oxides are more potent and active than single metal oxides (Table 1).…”