Superb water splitting activity of the electrocatalyst Fe3Co(PO4)(4) designed with computation aid
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- Superb water splitting activity of the electrocatalyst Fe3Co(PO4)(4) 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; Kim, Kwang S.
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE COMMUNICATIONS, v.10, pp.5195
- 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 [Fe3Co(PO4)(4)@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(-2) in 1M KOH), high turnover frequency (TOF: 0.54 s(-1)), 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 Fe3Co(PO4)(4)@rGO anodic electrode is integrated with a Pt/C cathodic electrode, the electrolyzer requires only 1.45 V to achieve 10 mA cm(-2) for whole water splitting in 1M 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.
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