Ibaraki University's
Graduate School of Science and Engineering (Engineering)
Department of Materials Science and Engineering



Other affiliation / position

  1. Frontier Research Center for Applied Atomic Sciences


  1. 花王株式会社 東京研究所 研究員 1991/04-1992/03
  2. 慶應義塾大学 理工学部 非常勤講師 1995/04-1995/10
  3. 新技術開発事業団 特別研究員 (派遣先:金属材料技術研究所) 1995/10-1998/03
  4. 茨城大学 工学部 物質工学科 助手 1998/04-2005/06
  5. 茨城大学 工学部 物質工学科 講師 2005/07-Present
  6. 茨城大学 工学部 生体分子機能工学科 講師 2006/07/01-2010/03/31
  7. 茨城大学 工学部 生体分子機能工学科 准教授 2010/04/01-Present

Academic background

  1. Keio University Faculty of Science and Engineering Department of Applied Chemistry 1989 Graduated
  2. Keio University Graduate School, Division of Science and Engineering Applied of Chemistry Doctor course 1995 Completed 3-14-1, Hiyoshi,Kohoku-ku, yokohama

Academic degrees

  1. Ph.D Keio University

Research Areas

  1. Industrial Physical Chemistry
  2. Functional Materials/Device

Subject of research

  1. Lithium Secondary Battery リチウム二次電池用正極材料の合成および評価 1995/04-Present
  2. 燃料電池に関する研究 2003-Present
  3. バイオセンサに関する研究 2005-2011

Proposed theme of joint or funded research

  1. Fuel Cell Wish to undertake joint research with industry and other organizations including private sector. Technical consultation,Commisioned research,Joint research,Others
  2. Lithium Secondary Battery Wish to undertake joint research with industry and other organizations including private sector. Technical consultation,Commisioned research,Others


  1. Fuel Cell Efficiency, A new nondestructive method for measuring flow rate distribution between cells by electrochemical techniques in an actual polymer electrolyte fuel cell stack Mika Eguchi, Fumihiko Sekinea, Yoshio Kobayashi, Yasuyuki Tsutsumi Nova Science Publishers, Inc. 2012/02/10 978-1-61209-619-3


  1. Research paper (scientific journal) Joint Preparation of catalyst for polymer electrolyte fuel cell using the Marimo-like carbon Koki Baba, Mikka Nishitani-Gamo, Toshihiro Ando, Mika Eguchi Transactions of the Materials Research Society of Japan 42/ 2, 51-56 2017/04/03 We have investigated the influence of the concentrations of both the chloroplatinic acid and sodium borohydride solution on the formation of the Pt nanoparticles in this study.A lower chloroplatinic acid concentration and higher sodium borohydride concentration produced fine Pt particles with higher dispersion and better catalytic activity than other.
  2. Research paper (scientific journal) Joint Gas-leak-induced pinhole formation at polymer electrolyte membrane fuel cell electrode edges Hiroyuki Gunji, Mika Eguchi, Fumiaki Sekine, Yasuyuki Tsutsumi International Journal of Hydrogen Energy 42/ 1, 562-574 2017/01/05 Pinhole formation in the membrane is a polymer electrolyte membrane fuel cell (PEMFC) failure mode typically due to mechanical causes. This study reports the discovery of thermal pinhole formation caused by a gas leak. The study was prompted by an unexpected cell failure of a real PEMFC stack during its initial conditioning. A little gas leak had been detected in the stack, and the gas leak was suspected to generate pinholes. However, in spite of the large gas leak, pinholes did not appear in the normal cells with a GDL-covered catalyst layer. Additional cells with a GDL-uncovered catalyst layer simulating an uneven electrode edge of the failed stack were then tested under the gas leak conditions. Pinholes were demonstrated to appear at the GDL-uncovered catalyst layer position near the gas leak path during the initial conditioning and the phenomena were reproducible. A gas-leak-induced thermal pinhole formation is suggested in which the leaked gas hits the GDL-uncovered low-heat-dissipation catalyst, a hot spot occurs by catalytic combustion, generating the pinhole.
  3. Research paper (scientific journal) Joint Durable Marimo-like carbon support for Platinum nanoparticle catalyst in polymer electrolyte fuel cell Koki BABA, Mikka NISHITANI-GAMO, Toshihiro ANDO, Mika EGUCHI Electrochimica Acta 213, 447-451 2016/07/18 This study deals with the electrochemical stability of carbon-based catalyst supports as the cathode material of a polymer electrolyte fuel cell (PEFC). The platinum catalyst on the carbon black supports (Pt/CB) was investigated for use in the PEFC. Marimo-like carbon (MC) was used for the catalyst support. Electrochemical surface oxidation of the Marimo-like carbon was compared to that of conventional carbon black during simulated start-stop cycles. We observed a different durability of the electrocatalytic activity between the carbon black and the Marimo-like carbon based on the CV measurements and the XPS. In case of the carbon black, the electrochemical active surface area (ECA) decreased and the electric double layer current density increased with increasing number of cycles in the accelerated degradation test (ADT). These results indicated oxidation of the carbon in the Pt/CB by the ADT. In case of the Marimo-like carbon, the ECA decreased less than in the case of the carbon black, and no change was observed in the XPS. These results indicated that surface oxidation of the Marimo-like carbon proceeded less than that of the conventional carbon black.
  4. Research paper (bulletin of university, research institution) Joint マリモ状カーボン繊維を利用した物質拡散性に優れる燃料電池用触媒の開発 馬場恒生,江口美佳,蒲生西谷美香,安藤寿浩 エフシー開発技術誌 26-30 2015/11
  5. Research paper (bulletin of university, research institution) Joint PEFCスタック各セルの流量およびガスリーク計測 浅本麻紀子,堤 泰行,郡司浩之,江口美佳 エフシー開発技術誌 22-25 2015/11

Research presentations

  1. Poster presentation バインダー量がLi4Ti5O12/マリモカーボン複合体電極に及ぼす影響,PS-68 電気化学会第85回大会 2018/03/09
  2. Poster presentation Li4Ti5O12/マリモカーボン複合体電極の充放電特性とインピーダンス法による評価,PS-67 電気化学会第85回大会 2018/03/09
  3. Poster presentation 触媒担体にマリモカーボンを用いた触媒層の発電性能における加湿条件の影響,PFC01-10 電気化学会第85回大会 2018/03/09
  4. Oral presentation(general) PEFC発電性能におけるカーボン担体構造の影響,F-O6-004 第27回日本MRS年次大会 2017/12/06
  5. Oral presentation(general) Li4Ti5O12/マリモカーボン複合体の電気化学的特性,F-O6-003 第27回日本MRS年次大会 2017/12/06 Li4Ti5O12を用いてLi4Ti5O12/MC複合体を合成し,充放電特性について検討した。

Intellectual property rights

  1. Patent 触媒シートの製造方法,及び空気極の製造方法 2016-121868 2016/06/20
  2. Patent 触媒シートの製造方法,及び空気極の製造方法 2016-121869 2016/06/20
  3. Patent 触媒シート,及び空気極 2016-121870 2016/06/20
  4. Patent リチウム電池用電極活物質 2013-54384 2013/03/15 2014-177388 2014/09/25
  5. Patent マリモカーボンおよびその製造方法 2011-186146 2011/08/29 2013-47160 2013/03/07


  1. 表面技術協会 第12回学術奨励講演賞 2006/03/15

Alloted class

  1. 基礎化学
  2. Primary Aanalytical Chemistry
  3. Information Processing
  4. Basic Experiments for Bio-molecular Functional Engineering
  5. Life and Chemistry

Memberships of academic societies

  1. 電気化学会
  2. 表面技術協会
  3. The Electrochemical Society
  4. 日本化学会

Committee Career

  1. 日本化学会 関東支部幹事 2011/03/01-2013/02/28