Modulating the Electrocatalytic Performance of Palladium with the Electronic Metal–Support Interaction: A Case Study on Oxygen Evolution Reaction

Published on 2018-06-08T00:00:00Z (GMT) by
The present work reports a general approach to improve the electrocatalytic property of noble metal through regulating its electron status by introducing the electronic metal–support interaction (EMSI). As a case study, the catalytic activity of metallic Pd toward oxygen evolution reaction (OER) in alkaline solution has been significantly promoted by stabilizing Pd<sup>δ+</sup> oxidic species at the interface of the Pd–metal oxide support with the help of EMSI effect, suggesting an intrinsic advantage of Pd<sup>δ+</sup> in driving OER. We further demonstrate that the chemical state of Pd<sup>δ+</sup> can be easily modulated in the range of 2+ to 3+ by changing the metal oxide support, interestingly, accompanied by a clear dependence of the OER activity on the oxidation state of Pd<sup>δ+</sup>. The high Pd<sup>3+</sup> species-containing Fe<sub>2</sub>O<sub>3</sub>/Pd catalyst has fed an impressively enhanced OER property, showing an overpotential of 383 mV at 10 mA cm<sup>–2</sup> compared to those of >600 mV on metallic Pd and 540 mV on Fe<sub>2</sub>O<sub>3</sub>/glassy carbon. The greatly enhanced OER performance is believed to primarily derive from the distinctive improvement in the adsorption of oxygenated intermediates (e.g., *OH and *OOH) on metal-oxide/Pd catalysts. Moreover, similar EMSI induced improvements in OER activity in alkaline solution are also achieved on both of the Fe<sub>2</sub>O<sub>3</sub>/Au and Fe<sub>2</sub>O<sub>3</sub>/Pt, which possess the oxidic species of Au<sup>3+</sup>, and Pt<sup>2+</sup> and Pt<sup>4+</sup>, respectively.

Cite this collection

He, Hongyang; Chen, Junxiang; Zhang, Dafeng; Li, Fang; Chen, Xin; Chen, Yumei; et al. (2018): Modulating the Electrocatalytic Performance of Palladium

with the Electronic Metal–Support Interaction: A Case Study

on Oxygen Evolution Reaction. ACS Publications. Collection. https://doi.org/10.1021/acscatal.8b00460