Cover Page August-2019-Advanced Materials Letters

Advanced Materials Letters

Volume 10, Issue 8, Pages , August 2019
About Cover

3D printing as the state-of-the-art emerging technology offers a platform for the new industrial horizons. The manufacturing process for creating 3D physical objects done via successive layer-by-layer deposition of materials such as metal, plastic, ceramics, or even living cells. The 3D printing concept was first proposed in the 1980s using stereolithography to make polymer objects. 3D technology could transform manufacturing, global product consumption and supply chains. The cover photo of July 2019 issue describes the structure of a 3D printed objects and to celebrate the 39th anniversary of its innovation.


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

Adv. Mater. Lett., 2019, 10 (8), pp

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.  © VBRI Press.

Keywords

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

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