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- Fan, Liangdong, 1985-, et al.
(författare)
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Effective hydrogen production by high temperature electrolysis with ceria-carbonate composite
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The high temperature electrolysis potentially offers an effective approach for large-scale and high purity hydrogen production. Besides, the research on the hybrid oxygen ion/proton conductive behavior is a hot field in the ceria-based composite field. In this present study, single cell assembled by SDC-carbonate electrolyte and Ni-based electrode was fabricated and operated in ceramic electrolysis cells (CECs) model. The effect of the relative humidity and temperature on the electrochemical performance was investigated by electrochemical impedance spectra (EIS) and polarization curves. Under an applied electrolysis voltage of 1.6 V, the maximum consumed current density is 1.2 Acm-2 in oxygen ionic conduction mode. The electrochemical performance in proton conduction mode is comparable to the oxygen ion conduction mode. The results here again demonstrate the hybrid ionic conduction of ceria-carbonate composite, and provide a promising materials system for high efficient hydrogen production.
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| 2. |
- Liu, Yanyan, et al.
(författare)
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A Single-Phase Mixed-Conductive Pr-Doped CeO2 Membrane for Advanced Fuel-to-Electricity Technology
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Pr-doped CeO2 has exhibited many interesting properties relying on the flexible valence of praseodymium. The tailorable doping contents of praseodymium determine the ionic or mixed electronic-ionic conductivity properties of the Pr-doped CeO2. Interestingly, the characteristic feature that praseodymium element preferably attributes on the surface of ceria particles facilitates the surface exchange kinetics for oxygen transport relying on oxygen vacancies and resulting in high ionic conduction. Hereby, we investigated a 10 mol.% Pr-doped CeO2 (Pr-CeO2) synthesized by hydrothermal method focusing on its surface conductive properties. The as-prepared Pr-CeO2 exhibited a high electrical conductivity of 0.36 S cm-1 at 600 ℃. Using this mixed conductive Pr-CeO2, we fabricated a solid oxide fuel cell (SOFC) device in a ‘sandwich’ configuration while p-type semiconductor Ni0.8Co0.15Al0.05Li-oxide was pasted on both sides of Pr-CeO2 membrane layer. This device exhibited a comparable peak power density of 776 mW cm-2 at 600 ℃ to the conventional ionic conducting electrolyte-based SOFCs. Furthermore, the mechanism for surface conductivity enhancement has been discussed. These findings reveal an alternative methodology to prepare materials with significant impacts on advanced R&D SOFC technology.
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| 3. |
- Zhu, Bin, et al.
(författare)
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Designing Mindful Interaction for Direct Presence
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The digital health and wellbeing movement has led to development of digital mindfulness applications that aim to help people become mindful. How can we design mindful interaction? A key component of mindfulness is presence. In this paper, we (1) articulate our notion of direct presence as an affordance of artifacts. Direct presence artifacts are characterized by how they are designed for supporting presence in and/or with the artifacts designed. We then (2) show how we have worked with designing artifacts for direct presence. Finally (3) we suggest design sensitivities for direct presence. We have relied on feedback from workshop participants and test subjects and drawn inspiration from mindfulness practice and aesthetics. The work in this paper illustrates our design process as an example of how affordances for direct presence can be designed.
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