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成果報告書詳細
管理番号20180000000076
タイトル*平成29年度中間年報 エネルギー・環境新技術先導プログラム 超高変換効率新規プロトン導電デバイスの開発
公開日2018/12/14
報告書年度2017 - 2017
委託先名国立研究開発法人産業技術総合研究所 パナソニック株式会社 株式会社ノリタケカンパニーリミテド 国立大学法人東北大学多元物質科学研究所 国立大学法人宮崎大学 国立大学法人横浜国立大学 一般財団法人ファインセラミックスセンター
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies. Development of Ultrahigh Efficiency Proton-Conducting Electrochemical Devices (FY2017-FY2018) FY2017 Annual Report

(1) Systems simulation of a working PCFC The aim of this study was to construct a mathematical model that can be used to assess the effectiveness of the entire PCFC system. Under conditions pertaining to a household-use co-generator system, the model predicted a current density of 0.3 A/cm2, cell area specific resistance of 0.4 Ωcm2, fuel utilization of 0.9, maximum thermal ratio of 0.9, and system power efficiency of 70% (DC, LHV) with an ion/hole ratio of 0.85 for the proton conducting electrolyte layer. (2) Development of a new technique for measuring transport numbers in proton conducting electrolyte materials In this study, we developed a novel method for directly measuring the protonic current passing through the electrolyte layer in a PCFC under operating conditions. The method combines a hydrogen and oxygen electrolyzers, which allows the hydrogen and oxygen concentrations in a gas-tight chamber to be controlled. Under these conditions the current in the hydrogen electrolyzer corresponds to the protonic current ratio in the total current passing through the pellet. (3) Materials design of proton conducting ceramics In this study we used state-of-the-art first-principles calculations to systematically investigate around 130 different types of point defects and defect clusters in BaZrO3 doped with 20 mol% Y, Yb, or Sc. The results indicated that, of the three dopants examined, Yb produces the highest mobile proton concentration, so that Yb-doped BaZrO3 (BZYb) exhibit provide the highest proton conductivity under typical PCFC operating conditions. (4) Development of novel proton conducting ceramics We developed a new BaZrO3-based material with high Ni and CO2 tolerance. Of various trivalent metal dopants examined, only Yb3+ was found to be suitable for producing proton-conducting solid electrolytes for practical use because BZYb did not form undesirable phases by reaction with Ni or CO2. The conductivity of BZYb pellet was 0.11 S/cm at 600°C in a reducing atmosphere. (5) Development of high performance cathode fabrication technology In this study, we investigated the reaction pathway for the PCFC cathode by using two kinds of model electrodes: patterned thin film electrodes w/o TPBs. These results indicated that (a) TPBs are the dominant reaction pathway, and (b) the reduction of adsorption oxygens and the diffusion of the adsorption oxygen to TPBs are the rate-limiting processes. (6) Development of electrode-electrolyte joining technology In this study, we developed a process for joining a BZYb electrolyte layer and NiO-BZYb cermet anode substrate. A few percentages of Ni diffused into electrolyte during co-sintering process can reduce the shrinkage mismatch between them, so that a dense 10 μm thick BZYb electrolyte could be successfully joined to a 600 μm thick porous NiO-BZYb substrate by co-sintering. (7) Design and development of fabrication technology for novel sealing materials The aim of this study was to design novel sealing materials for use in PCFC cell stacks by precisely controlling the composition of a partially crystallized glass. When sandwiched between the BZYb electrolyte and metal separator, the glass exhibited a He cross-leakage below 1% after heat treatment at 600°C for 100 h and after ten thermal cycles.
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