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Affiliation |
Engineering educational research section Department of Applied Chemistry Program |
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Associate Professor |
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External Link |
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MATSUNAGA Naoki
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Degree 【 display / non-display 】
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Doctor (Engineering) ( 2003.3 Kyushu University )
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修士（工学） ( 2000.3 長崎大学 )
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学士（工学） ( 1998.3 長崎大学 )
Research Areas 【 display / non-display 】
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Nanotechnology/Materials / Inorganic materials and properties
Papers 【 display / non-display 】
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Matsunaga N., Kikuchi K., Tokunaga K., Kohno D., Sakai G.
Bulletin of Materials Science 46 ( 3 ) 2023.9
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Bulletin of Materials Science
The present study was conducted to prepare precursors by rapid hydrolysis method for realizing lower temperature formation of NiFe2O4 under hydrothermal conditions. The precursor, obtained from a lower concentration of NiCl2–FeCl2 mixed solution, was almost amorphous and could be easily converted to NiFe2O4 crystal phase at around 130°C by hydrothermal treatment. On the other hand, when a higher concentration of NiCl2–FeCl2 solution or trivalent iron salt (FeCl3) was used as starting reagents, individual crystal phases such as α-Ni(OH)2, γ-Fe2O3 and α-FeOOH were recognized in precursors owing to the difference in hydrolysis rates between Ni2+ and Fe2+ (or Fe3+). These individual crystal phases involved precursors that could not be converted easily to NiFe2O4 crystal phase, but needed to treat at higher temperatures for forming NiFe2O4 at least 200°C. Thus, the co-existence of individual crystal phases in precursors might prevent the amorphous precursor from forming NiFe2O4 crystal phase. The formation of NiFe2O4 at lower temperatures is considered to be taken place preferentially from amorphous precursors than individual certain crystal phases.
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Optimum dopant of barium zirconate electrolyte for manufacturing of protonic ceramic fuel cells Reviewed
Kuroha T., Niina Y., Shudo M., Sakai G., Matsunaga N., Goto T., Yamauchi K., Mikami Y., Okuyama Y.
Journal of Power Sources 506 2021.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Power Sources
We examine ceramic tape-casting and anode electrolyte co-firing for large-scale manufacturing of protonic ceramic fuel cells. We confirm the reactivity of Ni, a commonly used anode, with BaZr0.8M0.2O3−δ (BZM20: M = Sc, In, Lu, Yb, Y or Gd). Addition of 0.4 mol% NiO to BZM20 and co-firing at 1778 K, produces BaM2NiO5 for M = Y and Gd. No reaction occurs for M = Sc, In, Lu and Yb. The proton conductivity of all BZM20s decreases by approximately 30% because of NiO doping and dehydration on dissolution NiO. Energy efficiency and power density calculations of the fuel cells based on measured proton and hole conductivities indicate respective decreases of approximately 10% and 75% ecause of the formation of a solid solution of NiO. We fabricate fuel cells by the tape-casting and anode electrolyte co-firing with BZM20 (M = Yb or Y). For M = Y, the cell cannot be fabricated because formation of BaY2NiO5 causes cell cracking. Conversely, when M = Yb, a cell with a maximum output of 0.5 Wcm−2 at 873 K is fabricated. Hence, BZYb20 is a suitable material for tape-casting and anode electrolyte co-firing.
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Kuroha T., Yamauchi K., Mikami Y., Tsuji Y., Niina Y., Shudo M., Sakai G., Matsunaga N., Okuyama Y.
International Journal of Hydrogen Energy 45 ( 4 ) 3123 - 3131 2020.1
Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Hydrogen Energy
© 2019 Hydrogen Energy Publications LLC We investigated the influence of Ni on protonic ceramic fuel cells based on indium-doped barium zirconate. A tubular fuel cell was fabricated and evaluated with BaZr0.8In0.2O3−δ as an electrolyte. The maximum power density was 0.143 W cm−2 and the ohmic resistance of the electrolyte was 0.91 Ω cm2 at 873 K. We used secondary ion mass spectrometry to measure the dissolution of Ni in the electrolyte N to be 0.015. To clarify the effect of Ni on proton transport properties of BaZr0.8In0.2O3−δ, electrical conductivity and proton concentration were measured by AC impedance analysis and thermogravimetric analysis. Electrical conductivity decreased as the NiO content increased. Conversely, proton concentration was independent of the NiO content and proton diffusivity decreased. The sample density also depended on the NiO content. The density decreased as NiO content increased. These results were consistent with the density calculated based on a model describing formation of oxygen vacancies.
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Okuyama Y., Nagatomo S., Niisaka A., Matsunaga N., Sakai G., Sasamata Y., Ogura Y., Mizutani Y.
ECS Transactions 91 ( 1 ) 2653 - 2659 2019
Language：English Publishing type：Research paper (scientific journal) Publisher：ECS Transactions
© The Electrochemical Society. Steam electrolysis using a proton conducting oxide might offer low-cost hydrogen production using a combination of electrical energy and thermal energy that comes from solar energy. On the other hand, the hydrogen production efficiency is low due to the electrical leakage for the electrolysis of H2O-O2. In this study, the additive effect of methane on the hydrogen production efficiency for stem electrolysis using a proton conducting oxide was examined. The steam electrolysis was performed under a H2O-O2, H2O-CH4 atmosphere at 1073 K. The hydrogen evolution rate of the H2O-CH4 electrolysis with the Ru catalyst was in agreement with the value according to Faraday's law. The hydrogen evolution rate and the electrolysis voltage were found to increase in the order of the H2O-CH4 electrolysis with the catalyst < the H2O-CH4 electrolysis without the catalyst < the H2O-O2 electrolysis.
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Proton Conduction and Incorporation into La1−xBaxYb0.5In0.5O3−δ (共著) Reviewed
Okuyama Yuji, Ymaguchi Takuya, Matsunaga Naoki, Sakai Go
MATERIALS TRANSACTIONS 59 ( 1 ) 14 - 18 2018.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本金属学会
In order to clarify the effect of the dopant concentration and phase transition on the proton conduction and proton concentration, the electrical conductivity and proton concentration were determined for La<sub>1−</sub><i><sub>x</sub></i>Ba<i><sub>x</sub></i>Yb<sub>0.5</sub>In<sub>0.5</sub>O<sub>3−δ</sub> (x = 0.1. 0.3. 0.5, 0.7). The phase transition from the orthorhombic system to the cubic system was over <i>x</i> = 0.3. The proton/deuteron isotope effect on the conductivity was observed for all samples at 673 K. The proton concentration was independent of the barium content above 673 K. The proton concentration increased with the barium content below 673 K, but the concentration ratio of the proton to dopant decreased following an increase in the barium concentration. It was determined that the dopant concentration and phase transition do not have an influence on the conduction and incorporation of protons into the La<sub>1−</sub><i><sub>x</sub></i>Ba<i><sub>x</sub></i>Yb<sub>0.5</sub>In<sub>0.5</sub>O<sub>3−δ</sub>.
MISC 【 display / non-display 】
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グラファイト含有耐火れんがの熱伝導度の理論的解析(共著)
平田好洋、松永直樹、吉富丈記、加山恒夫
耐火物 65 ( 5 ) 205 - 212 2013.5
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：耐火物技術協会
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高靱性、高強度の炭化ケイ素焼結体の開発（共著）
平田 好洋, 松永 直樹
材料の科学と工学 49 ( 1 ) 20 - 25 2012.2
Language：Japanese Publishing type：Research paper, summary (national, other academic conference) Publisher：日本材料科学会
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Reforming of biogas using electrochemical cell (共著)
Y. Hirata, N. Matsunaga, S. Sameshima
Journal of the Ceramic Society of Japan 119 ( 11 ) 763 - 769 2011.11
Language：English Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本セラミックス協会
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Colloidal Processing of High Performance Silicon Carbide "jointly worked"
Journal of the Society of Power Technology, Japan 48 ( 8 ) 542 - 551 2011.8
Language：Japanese Publishing type：Research paper, summary (national, other academic conference) Publisher：The Society of Powder Technology, Japan
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多孔質セル電極内の酸化還元反応によるバイオガス改質（共著）
平田 好洋, 松永 直樹
未来材料 10 ( 11 ) 40 - 47 2010.11
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：エヌ・ティー・エス
Presentations 【 display / non-display 】
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亜鉛置換水酸化ニッケルの合成と構造解析
上村海翔, 松永直樹, 酒井剛
トークシャワー・イン・九州2023 (北九州国際会議場) 2023.9.27 高分子学会九州支部, 繊維学会西部支部, 日本農芸化学会西日本支部, 化学工学会九州支部, 日本化学会九州支部, 有機合成化学協会九州山口支部, 電気化学会九州支部, 日本分析化学会九州支部, 北九州市
Event date： 2023.9.27 - 2023.9.28
Language：Japanese Presentation type：Poster presentation
Venue：北九州国際会議場
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NiFe2O4の低温合成を可能とするNiCl2-FeCl2希薄混合溶液からの前駆体の合成
菊池航大、酒井 剛、松永直樹
トークシャワー・イン・九州2023 (北九州国際会議場) 2023.9.27 高分子学会九州支部, 繊維学会西部支部, 日本農芸化学会西日本支部, 化学工学会九州支部, 日本化学会九州支部, 有機合成化学協会九州山口支部, 電気化学会九州支部, 日本分析化学会九州支部, 北九州市
Event date： 2023.9.27 - 2023.9.28
Language：Japanese Presentation type：Poster presentation
Venue：北九州国際会議場
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水熱処理により低温で合成した高比表面積ニッケルフェライト相の塩基性条件下における水電解アノード特性
松永直樹、矢野佑樹、酒井 剛
2023年電気化学秋季大会 (長崎大学 文教キャンパス) 2023.9.11 電気化学会
Event date： 2023.9.11 - 2023.9.12
Language：Japanese Presentation type：Oral presentation (general)
Venue：長崎大学 文教キャンパス
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三塩化チタンの加水分解で得られた高比表面積酸化チタンの特異的結晶成長
渡邉 悠太、松永 直樹、酒井 剛
第60回化学関連支部合同九州大会 (北九州国際会議場) 2023.7.1 高分子学会九州支部, 繊維学会西部支部, 日本農芸化学会西日本支部, 化学工学会九州支部, 日本化学会九州支部, 有機合成化学協会九州山口支部, 電気化学会九州支部, 日本分析化学会九州支部, 北九州市
Event date： 2023.7.1
Language：Japanese Presentation type：Poster presentation
Venue：北九州国際会議場
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Mn置換水酸化ニッケルの合成と構造解析
佐藤 瑠星、松永 直樹、酒井 剛
第60回化学関連支部合同九州大会 (北九州国際会議場) 2023.7.1 高分子学会九州支部, 繊維学会西部支部, 日本農芸化学会西日本支部, 化学工学会九州支部, 日本化学会九州支部, 有機合成化学協会九州山口支部, 電気化学会九州支部, 日本分析化学会九州支部, 北九州市
Event date： 2023.7.1
Language：Japanese Presentation type：Poster presentation
Venue：北九州国際会議場
Awards 【 display / non-display 】
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若林論文賞
2013.4 耐火物技術協会
Y. Hirata, N. Matsunaga, J. Yoshitomi, T. Kayama
Award type：Honored in official journal of a scientific society, scientific journal Country：Japan
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Best Poster Award
2013.1 The 14th International Symposium on Eco-materials Processing and Design (ISEPD2013)
Naoki Furukawa, Yoshihiro Hirata, Soichiro Sameshima, Naoki Matsunaga
Award type：Award from international society, conference, symposium, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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銀を用いた次世代アルカリ形燃料電池用電極触媒の調製と酸素還元活性評価
Grant number：24K08032 2024.04 - 2027.03
科学研究費助成事業 基盤研究（Ｃ）
松永直樹
Authorship：Principal investigator
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貴金属フリーな次世代燃料電池用電極触媒の合成と高性能化のための合成指針の確立
Grant number：16K05941 2016.10 - 2019.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator
アニオン交換膜形燃料電池は、電極触媒の白金量低減を可能にする次世代燃料電池として期待される。ただし既存の塩基性条件下で用いる電極触媒の酸素還元活性は、白金の酸素還元活性より劣る。最近、本研究グループでは遷移金属化合物を積層した白金板の酸素還元活性が白金と同等以上の触媒活性を示すことを見出した。本研究では電極触媒の白金量低減を目的として、耐塩基性の高い遷移金属/遷移金属化合物複合体を調製し、塩基性条件下での酸素還元活性の有無を検証するとともに、複合体の酸素還元活性を向上させる最適条件を明らかにする。本研究成果は、塩基性条件下で高い酸素還元活性を示す電極触媒の設計指針の構築への寄与が期待される。
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Electrochemical synthesis and photocatalytic properties of Al2O3-ITO-TiO2 system film
Grant number：21760535 2009.04 - 2012.03
Grant-in-Aid for Scientific Research Grant-in-Aid for Young Scientists(B)
Available Technology 【 display / non-display 】
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アルカリ用電極触媒を目指した金属複合水酸化物に関する合成
人工骨を目指したセラミックスに関する合成Message：・共同研究の希望テーマ：無機材料・電気化学に関する研究
・セラミックス材料の合成（特に湿式法）、利用、分析に関すること、また強度に関することであればご相談ください。