著者

荒川 裕則

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.24, no.1, pp.81-88, 1999 (Released:2022-07-21)

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Hydrogen production from water using inexhaustible solar light, which is considered to be an artificial photosynthesis reaction, is one of dream technologies for human beings. Here, recent progress in photocatalytic water splitting was introduced. First, it was shown that Na2CO3 addition method was very useful to produce H2 and O2 from water stoichiometrically using simple semiconductor photocatalysts such as Pt/TiO2. Using this method, solar hydrogen production was demonstrated for the first time. Then, a two-step water splitting system, which was similar to Z-scheme of photo-synthesis, was newly proposed in order to utilize visible light.

著者

大泉 正一 田中 康裕 飯田 隆幸

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.45, no.3, pp.159-164, 2020 (Released:2023-11-18)

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The new fuel cell train “Series FV-E991” is under development by JR East, and equipped with a hybrid system using the hydrogen fuel cell and storage battery as power sources. It is going to be the world’s first fuel cell train using 70MPa high-pressure hydrogen enabling longer distance running which is not possible with 35MPa hydrogen.We plan to start demonstration tests of Series FV-E991 on commercial lines from 2021FY. In these tests, we will collect data toward practical use, such as the optimization of the fuel cell technology and the investigation of the technical development items related to ground facilities.We aim at the early commercialization of high-performance and safe fuel cell train that meets the stringent standards of Japan’s railways which are principally operated in densely populated areas.

著者

篠原 和彦 今井 英人

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.46, no.2, pp.55-62, 2021-06-30 (Released:2023-11-18)

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Evaluation and analysis of fuel cells is an indispensable technology for improving the performance and durability of fuel cells in the future. On the other hand, not all evaluation protocols for each evaluation item set as the development target have been prepared. From the perspective of maintaining and improving international competitiveness, it is important to develop functional targets, corresponding evaluation items, and evaluation protocols that are expected to be deployed in HDV, etc. In the latter part, we overview the domestic development status of advanced PEFC analysis technologies that enhance international competitiveness in PEFC development.

著者

阿部 正

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.35, no.3, pp.4-10, 2010 (Released:2022-03-18)

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Substantial reduction of greenhouse gas is requested to deal with the global warming issue. As an innovative technique to achieve it, a fuel cell vehicle (FCV) and production, storage and supply technologies of hydrogen, which is fuel of FCV, are the important position in the national policy.FCV, which is one of the next generation cars and considered as an ultimate clean energy vehicle, has been developed actively for practical use. Also, demonstration studies of hydrogen refueling stations have been executed including the metropolitan area.In this report, it introduces the outline of the JHFC project (Japan Hydrogen & Fuel Cell Demonstration Project), which has been promoted aiming at spread start of FCV and hydrogen refueling stations to the average user in 2015.

著者

内田 晴久 吉田 加奈 菅 幹雄

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.23, no.1, pp.29-34, 1998 (Released:2022-07-21)

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As an example of estimating the environmental impact of hydrogen energy system, we calculated the emission of CO2 at hydrogen production and at transportation through gas pipelines. The emission was estimated using environmental I/O table. The CO2 emission depend strongly on the kind of primary energy. For the energy transportation, less emission was obtained in case of long distance transportation using tubes inadequate diameters than electric power transportation for the same amount of energy.

著者

森大 五郎 小宮 健嗣 川徳 彦 田公 聖 久保 秀人 藤敬 司 渡辺 慎太郎

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.34, no.4, pp.46-51, 2009 (Released:2022-07-21)

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High-pressure metal hydride tank, a combination technology of metal hydride and high-pressure tank, is one of promising option for fuel cell vehicles. Both high storage capacity and good charge-discharge performance can be achieved by this system. 1st generation system is “CFRP High-pressure Metal Hydride Tank”. 5.3 kg hydrogen can be stored within 100 L tank with 2.5 mass% BCC alloy at 35 MPa. A separated aluminum liner is designed for this system to install a tube and fin type heat.exchanger with metal hydride powder into the tank. In a burst test, a prototype was not ruptured at 100 MPa inner-pressure. And at a pressure cycle test, there was no leak during 22,000 cycles. It is possible to secure enough strength equal to conventional CFRP high-pressure tank. 2nd generation system is “Multi-cylinder High-pressure Metal Hydride Tank”. It has a bundling structure by 10-40 metallic vessels which install hydrogen-absorbing alloy. The bundle of the vessels is also a heat exchanger. To improve thermal conductivity, hydrogen supply pressure is lowered to 10-20 MPa, which makes it possible to reduce the wall thickness of vessel. Experimental results by prototype tank and simulation results by 1/1 scale on-board tank model show that 5 kg hydrogen can be stored within 83 L tank and also that more than 80 % of hydrogen can be stored within 5 minutes if a hydrogen-absorbing alloy with 3.0 mass% effective capacity is developed.

著者

岡部 昌規 中沢 孝治

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.35, no.3, pp.22-28, 2010 (Released:2022-03-18)

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Honda has been developing an experimental solar hydrogen station (SHS) in order to propose a solution for energy and global environmental issues. The results from proving tests of the SHS1 suggest that a renewable hydrogen station of a size suitable for household use would require still greater compactness and higher efficiency. Therefore we developed high differential pressure electrolyzer stack, which is an innovative technology. The stack differs from the ordinary high pressure electrolyzer that keeps both the anode side and the cathode side in a high pressure state. Here, instead, the anode side is under normal pressure and only the cathode side is maintained under the high pressure of 35 MPa. Therefore, this one has a simpler structure and can be made compact. Furthermore, the stack here has the functions of both generating and compressing hydrogen. With this stack, SHS2 was made into a compact, highly efficient and low-noise, home-sized hydrogen refueling appliance.

著者

高橋 亮人

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.21, no.2, pp.39-44, 1996 (Released:2022-07-21)

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Current status of so called cold fusion (new hydrogen energy) research is reviewd. Researches in last 7 years after March 1989 have established the following facts: a) There happen surely anomalous excess heats sometimes in heavy water electrolyses with Pd cathodes. b) During the excess heat generation, no correspondingly intense d-d fusion takes place. c) Excess heat correlates with D/Pd>0.85, electrolysis current density > 0.2 A/cm2 and dynamic loading condition. d) No correlations in-situ with primarily emitted radiations (charged particles) are observed. e) A few un-identified reports on He-4 production as nuclear ash which have never been claimed should be many times duplicated by future efforts. The key for the future of new hydrogen energy is resolving "nuclear or chemical issue" for excess heat.

著者

亀山 秀雄 桜井 誠 増田 明之 福井 友亮 小貫 薫 久保 真治 今井 良行

出版者

一般社団法人 水素エネルギー協会

雑誌

水素エネルギーシステム (ISSN:13416995)

巻号頁・発行日

vol.37, no.1, pp.3-10, 2012 (Released:2022-03-10)

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The technical present status of hydrogen production process using IS thermochemical cycle was introduced. This process is experimentally investigated in Japan, USA, Germany, France, Italy, India, China and Korea. Japan Atomic Energy Agency succeeded in consecutive hydrogen production as a proof examination. The trend of the research and development about the reactions, separation technology, device materials and the process equipment were reported. Thermochemical ammonia production cycle was also introduced. This new cycle is named ISN cycle which was modified from IS cycle in order to produce ammonia from water and nitrogen.