High-performance AEM unitized regenerative fuel cell using Pt-pyrochlore as bifunctional oxygen electrocatalyst | Zendy

Pralay Gayen | Zendy; Sulay Saha | Zendy; Xinquan Liu | Zendy; Kritika Sharma | Zendy; Vijay Ramani | Zendy

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High-performance AEM unitized regenerative fuel cell using Pt-pyrochlore as bifunctional oxygen electrocatalyst

Author(s) -

Pralay Gayen,

Sulay Saha,

Xinquan Liu,

Kritika Sharma,

Vijay Ramani

Publication year - 2021

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.2107205118

Subject(s) - electrocatalyst , bifunctional , chemistry , oxygen evolution , electrolysis , oxygen , inorganic chemistry , chemical engineering , catalysis , electrochemistry , electrode , organic chemistry , engineering , electrolyte

The performance of fixed-gas unitized regenerative fuel cells (FG-URFCs) are limited by the bifunctional activity of the oxygen electrocatalyst. It is essential to have a good bifunctional oxygen electrocatalyst which can exhibit high activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). In this regard, Pt-Pb 2 Ru 2 O 7-x is synthesized by depositing Pt on Pb 2 Ru 2 O 7-x wherein Pt individually exhibits high ORR while Pb 2 Ru 2 O 7-x shows high OER and moderate ORR activity. Pt-Pb 2 Ru 2 O 7-x exhibits higher OER (η @10mAcm-2 = 0.25 ± 0.01 V) and ORR (η @-3mAcm-2 = -0.31 ± 0.02 V) activity in comparison to benchmark OER (IrO 2 , η @10mAcm-2 = 0.35 ± 0.02 V) and ORR (Pt/C, η @-3mAcm-2 = -0.33 ± 0.02 V) electrocatalysts, respectively. Pt-Pb 2 Ru 2 O 7-x shows a lower bifunctionality index (η @10mAcm-2, OER - η @-3mAcm-2, ORR ) of 0.56 V with more symmetric OER-ORR activity profile than both Pt (>1.0 V) and Pb 2 Ru 2 O 7-x (0.69 V) making it more useful for the AEM (anion exchange membrane) URFC or metal-air battery applications. FG-URFC tested with Pt-Pb 2 Ru 2 O 7-x and Pt/C as bifunctional oxygen electrocatalyst and bifunctional hydrogen electrocatalyst, respectively, yields a mass-specific current density of 715 ± 11 A/g cat -1 at 1.8 V and 56 ± 2 A/g cat -1 at 0.9 V under electrolyzer mode and fuel-cell mode, respectively. The FG-URFC shows a round-trip efficiency of 75% at 0.1 A/cm -2 , underlying improvement in AEM FG-URFC electrocatalyst design.

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