Bidirectional energy & fuel production using RTO-supported-Pt–IrO2 loaded fixed polarity unitized regenerative fuel cells

2021 ◽  
Author(s):  
Pralay Gayen ◽  
Xinquan Liu ◽  
Cheng He ◽  
Sulay Saha ◽  
Vijay K. Ramani
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Specific Activity ◽  
Round Trip ◽  
Fuel Production ◽  
Regenerative Fuel Cell

A fixed-polarity unitized regenerative fuel cell using Pt–IrO2/RTO as a bifunctional OER- and HOR-electrocatalyst as an anode exhibits high PGM-mass-specific activity and high round-trip efficiency (40.2% at 1 A cm−2).

scholarly journals A low temperature unitized regenerative fuel cell realizing 60% round trip efficiency and 10 000 cycles of durability for energy storage applications

2020 ◽  
Vol 13 (7) ◽  
pp. 2096-2105 ◽  
Author(s):  
Yagya N. Regmi ◽  
Xiong Peng ◽  
Julie C. Fornaciari ◽  
Max Wei ◽  
Deborah J. Myers ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Energy Storage ◽  
Fuel Cell ◽  
Low Temperature ◽  
Round Trip ◽  
Catalyst Layers ◽  
Energy Storage Applications ◽  
Regenerative Fuel Cell

Unitized regenerative fuel cells with oxygen reactions occurring on different catalyst layers can achieve 60% round trip efficiencies at 1 A cm−2.

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.

scholarly journals Advanced materials for family of fuel cells: a review of polymer electrolyte membrane

2019 ◽  
Vol 10 (1) ◽  
pp. 4853-4863
Keyword(s):  
Fuel Cells ◽  
High Temperature ◽  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Energy Carrier ◽  
Solid Oxide ◽  
Regenerative Fuel Cell ◽  
Exchange Membrane ◽  
Power Curves

Hydrogen is an important energy carrier and a strong candidate for energy storage. It will be a useful tool for storing intermittent energy sources such as sun. Hydrogen is a versatile energy carrier that can be used to power nearly every end-use energy need. By this work, modeling and controlling of ion transport rate efficiency in proton exchange membrane (PEMFC), alkaline (AFC), direct methanol (DMFC), phosphoric acid (PAFC), direct forming acid (DFAFC), direct carbon fuel cell (DCFC) and molten carbonate fuel cells (MCFC) have been investigated and compared together. Thermodynamic equations have been investigated for those fuel cells in viewpoint of voltage output data. Effects of operating data including temperature (T), pressure (P), proton exchange membrane water content (λ), and proton exchange membrane thickness (d_mem) on the optimal performance of the irreversible fuel cells have been studied. Performance of fuel cells was analyzed via simulating polarization and power curves for a fuel cell operating at various conditions with current densities. SOFC (Solid oxide fuel cell) is usually combined with a dense electrolyte sandwiched via porous cathode and anode and SORFC (Solid oxide regenerative fuel cell) is a subgroup of RFC with solid oxide regenerative fuel cell. SORFC operates at high temperature with high efficiency and it is a suitable system for high temperature electrolysis.

Alkaline fuel cells running at elevated temperature for regenerative fuel cell system applications in spacecrafts

2012 ◽  
Vol 201 ◽  
pp. 236-242 ◽  
Author(s):  
S. Markgraf ◽  
M. Hörenz ◽  
T. Schmiel ◽  
W. Jehle ◽  
J. Lucas ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Elevated Temperature ◽  
Cell System ◽  
Fuel Cell System ◽  
Alkaline Fuel Cells ◽  
Regenerative Fuel Cell
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