Electrochemical promotion of ammonia synthesis with proton-conducting solid oxide fuel cells

Chien-I Li1, Akio Oikawa1, Fumihiko Kosaka2, Junichiro Otomo1*

1Department of Environment Systems, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8563, Japan

2Research Institute of Energy Frontier, Department of Energy and Environment, Research Institute of Energy Frontier, AIST Tuskuba West, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan

DOI: 10.5185/amlett.2019.2259

Publication Date (Web): Jan 14, 2019

E-mail: otomo@k.u-tokyo.ac.jp

Abstract

Direct electrochemical synthesis of ammonia was performed using proton-conducting solid oxide fuel cells. In this study, we investigated the effect of electrode potential on the reaction kinetics of ammonia formation with Fe- and Ru-based catalysts in detail. The cell configuration was Pt|BaCe0.9Y0.1O3 (BCY)|K-modified Fe or Ru-BCY. The ammonia formation rate of K-Ru was higher than that of K-Fe at the rest potential. However, the ammonia formation rate significantly increased by cathodic polarization for the Fe catalyst, and it showed a linear increase for the Ru catalyst, i.e., the ammonia formation rate for K-Fe significantly increased from the rest potential by several hundred times to -1.2V at 700oC, but K-Ru showed only a five times increase. The results suggest that the addition of K into Fe-BCY and cathodic polarization can improve the ammonia formation rate because of the promotion of bond dissociation of the N molecule on the Fe catalyst. The present work provides a hint for efficient ammonia formation and contribute to further development of ammonia electrochemical synthesis with proton-conducting solid oxide fuel cells.

Keywords

Ammonia synthesis, proton conductor, electrochemical promotion, energy storage.

Current Issue

9th Anniversary of Advanced Materials Letters: Progress and Opportunities


Coating - A potent method to enhance electrochemical performance of Li(NixMnyCoz)O2 cathodes for Li-ion batteries


Analysis of machined electron beam treated Ti6Al4V-ELI implant surfaces


Bottom-up design of hydrogels through click-chemistry modification of magnetic nanoparticles


Visualization of mechanical loads with semiconductor nanocrystals 


Room temperature growth of ultra porous hot-wire deposited tantalum pentoxide


Substrate integrated circular cavity resonator filled with nano-fibrillated cellulose for humidity detection


Oxygen vacancy filament-based resistive switching in Hf0.5Zr0.5O2 thin films for non-volatile memory


Innovative silicon compatible materials for light emitting devices  


Graphene micromesh for transparent conductive films application 


Applications of nano-scale Cirrus DopantTM to improve existing coatings


Chitin nanofibrils in renewable materials for packaging and personal care applications


Synthesis of AgNPs embedded double network nanocomposite hydrogels having high swelling and anti-bacterial characteristics


Previous issues

Artificial intelligence and machine learning empowering the mass medicine

Piezo-therapy in cancer: Current research and perspectives

Magnetic microwires for sensor applications

A fundamental study on the mechanistic impact of repeated de- and rehydration of Ca(OH)2 on thermochemical cycling in technical scale

Fabrication and characterization of nano-bridge Josephson junction based on Fe0.94Te0.45Se0.55 thin film

Riboflavin-UVA gelatin crosslinking: Design of a biocompatible and thermo-responsive biomaterial with enhanced mechanical properties for tissue engineering

Broadband and fast photodetectors based on multilayer p-MoTe2/n-WS2 heterojunction with graphene electrodes

Ionic liquid [BMIM][Cl] immobilized on cellulose fibers from pineapple leaves for desulphurization of fuels

Synthesis and role of co-dopants (alkaline earth divalents and halides) on the photoluminescence of Eu2+ doped BaAl2O4 phosphor

Metal oxide (V2O5) incorporated fly ash based geopolymer for better sustainable engineering composites

Highly efficient storage of solar gains using aluminum foam heat exchangers  

Green fabrication of zinc oxide nanospheres by aspidopterys cordata for effective antioxidant and antibacterial activity

Effect of diamantane on the thermal stability of cryomilled aluminum alloy

Upcoming Congress

Knowledge Experience at Sea TM