Superb water splitting activity of the electrocatalyst Fe<sub>3</sub>Co(PO<sub>4</sub>)<sub>4</sub> designed with computation aid.

Sultan, Siraj; Ha, Miran; Kim, Dong Yeon; Tiwari, Jitendra N; Myung, Chang Woo; Meena, Abhishek; Shin, Tae Joo; Chae, Keun Hwa et al. · Nat Commun · 2019

basic_science · Level V

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Abstract

For efficient water splitting, it is essential to develop inexpensive and super-efficient electrocatalysts for the oxygen evolution reaction (OER). Herein, we report a phosphate-based electrocatalyst [Fe<sub>3</sub>Co(PO<sub>4</sub>)<sub>4</sub>@reduced-graphene-oxide(rGO)] showing outstanding OER performance (much higher than state-of-the-art Ir/C catalysts), the design of which was aided by first-principles calculations. This electrocatalyst displays low overpotential (237 mV at high current density 100 mA cm<sup>-2</sup> in 1 M KOH), high turnover frequency (TOF: 0.54 s<sup>-1</sup>), high Faradaic efficiency (98%), and long-term durability. Its remarkable performance is ascribed to the optimal free energy for OER at Fe sites and efficient mass/charge transfer. When a Fe<sub>3</sub>Co(PO<sub>4</sub>)<sub>4</sub>@rGO anodic electrode is integrated with a Pt/C cathodic electrode, the electrolyzer requires only 1.45 V to achieve 10 mA cm<sup>-2</sup> for whole water splitting in 1 M KOH (1.39 V in 6 M KOH), which is much smaller than commercial Ir-C//Pt-C electrocatalysts. This cost-effective powerful oxygen production material with carbon-supporting substrates offers great promise for water splitting.