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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
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  • Synchrotron Radiation Application Researches

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Superb water splitting activity of the electrocatalyst Fe3Co(PO4)(4) designed with computation aid

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Title
Superb water splitting activity of the electrocatalyst Fe3Co(PO4)(4) designed with computation aid
Author
Sultan, SirajHa, MiranKim, Dong YeonTiwari, Jitendra N.Myung, Chang WooMeena, AbhishekShin, Tae JooChae, Keun HwaKim, Kwang S.
Issue Date
2019-11
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.10, pp.5195
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 [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.
URI
https://scholarworks.unist.ac.kr/handle/201301/30676
URL
https://www.nature.com/articles/s41467-019-13050-3
DOI
10.1038/s41467-019-13050-3
ISSN
2041-1723
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PHY_Journal Papers
UCRF_Journal Papers
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