Single-Atom Oxygen Reduction Reaction Electrocatalysts of Fe, Si, and N co-doped Carbon with 3D Interconnected Mesoporosity

2021 ◽  
Author(s):  
Hee Soo Kim ◽  
CHI HO LEE ◽  
Jue-Hyukk Jang ◽  
Min Seok Kang ◽  
Haneul Jin ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Reduction Reaction ◽  
Anion Exchange Membrane ◽  
Single Atom ◽  
Air Battery ◽  
Orr Activity ◽  
Exchange Membrane ◽  
Co Doped

Development of non Pt-based catalysts (non-PBCs) that show excellent oxygen reduction reaction (ORR) activity for high-performance Zn-air battery (ZAB) and anion exchange membrane fuel cell (AEMFC) is highly necessitated. Here,...

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

2021 ◽  
Vol 118 (40) ◽  
pp. e2107205118
Author(s):  
Pralay Gayen ◽  
Sulay Saha ◽  
Xinquan Liu ◽  
Kritika Sharma ◽  
Vijay K. Ramani
Keyword(s):  
Fuel Cell ◽  
High Performance ◽  
Reduction Reaction ◽  
Anion Exchange Membrane ◽  
Round Trip ◽  
Activity Profile ◽  
Air Battery ◽  
Orr Activity ◽  
Regenerative Fuel Cell ◽  
Exchange Membrane

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-Pb2Ru2O7-x is synthesized by depositing Pt on Pb2Ru2O7-x wherein Pt individually exhibits high ORR while Pb2Ru2O7-x shows high OER and moderate ORR activity. Pt-Pb2Ru2O7-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 (IrO2, η@10mAcm-2 = 0.35 ± 0.02 V) and ORR (Pt/C, η@-3mAcm-2 = -0.33 ± 0.02 V) electrocatalysts, respectively. Pt-Pb2Ru2O7-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 Pb2Ru2O7-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-Pb2Ru2O7-x and Pt/C as bifunctional oxygen electrocatalyst and bifunctional hydrogen electrocatalyst, respectively, yields a mass-specific current density of 715 ± 11 A/gcat-1 at 1.8 V and 56 ± 2 A/gcat-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.

Nano-geometric deformation and synergistic Co nanoparticles—Co-N4 composite sites for proton exchange membrane fuel cells

2021 ◽  
Author(s):  
Xiaoyang Cheng ◽  
Jian Yang ◽  
Wei Yan ◽  
Yu Han ◽  
Ximing Qu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Proton Exchange Membrane ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Single Atom ◽  
Geometric Deformation ◽  
Orr Activity ◽  
Co Nanoparticles ◽  
Exchange Membrane

Co single-atom (CoSA) catalysts of the CoN4 moiety usually show an unsatisfactory oxygen reduction reaction (ORR) activity due to poor O2 activation.

A 3-D nanoribbon-like Pt-free oxygen reduction reaction electrocatalyst derived from waste leather for anion exchange membrane fuel cells and zinc-air batteries

Nanoscale ◽  
2019 ◽  
Vol 11 (16) ◽  
pp. 7893-7902 ◽  
Author(s):  
Roby Soni ◽  
Siddheshwar N. Bhange ◽  
Sreekumar Kurungot
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Anion Exchange ◽  
Reduction Reaction ◽  
Anion Exchange Membrane ◽  
Single Source ◽  
Free Oxygen ◽  
Air Battery ◽  
Exchange Membrane ◽  
Zinc Air Batteries

In this work, leather is used as a single source of carbon and heteroatoms to derive a 3-D nanoribbon-like ORR electrocatalyst for AEMFC and zinc–air battery.

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