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作者： YOSHIKAWA Hidekazu YOSHIDA Tamiya symbio Community Forum

The symbio International Workshop 2012 was held in Kyoto on September 3, 2012, on the theme of advanced condition monitoring. There was one invited lecture on online monitoring of passive components for nuclear power plants, and ten papers presented in three sessions on（i） risk monitoring and application methodologies,（ii） prediction-monitor fusion for aged plant and other machines, and（iii） demonstration of risk monitors for NPP and online diagnosis monitor of electric machines. This article provides a condensed review of the presentations at the workshop.

关键词： advanced condition monitoring risk monitor online monitoring aged plant

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Electrochemical recovery of Pt/C electrocatalyst:optimization of the potential range on the leaching process and application to an aged MEA

Industrial Chemistry & Materials

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Industrial Chemistry & Materials 2024年第1期2卷 118-131页

作者： Francois Guillet Marian Chatenet Alex Paul Lenka Svecova Laetitia Dubaua Univ.Grenoble Alpes Univ.Savoie Mont BlancCNRSGrenoble INPLEPMI38000 GrenobleFrance symbio 5 rue Simone Veil69200 VenissieuxFrance

Carbon-supported platinum nanoparticles(Pt/C)are widely used electrocatalysts in proton exchange membrane fuel cell and electrolyzer applications and represent a substantial part of the capital expenditure of these *** being a critical raw material,its recovery is critical for the deployment of these *** this contribution,the first step of a recycling protocol,*** leaching of Pt/C,is *** avoid the use of concentrated acids and oxidants,the focus of the present study is on the design of an efficient electrochemical *** particular,the values of the upper and lower potential limits have an impact on Pt dissolution *** upper potential limit should avoid(or at least limit)Pt particles'detachment from the carbon support and the lower potential limit should take into account the competition between the platinum dissolution and the unwanted platinum *** evolution of the particle morphology and dissolution rate were monitored by coupling a statistical analysis of TEM images and ICP-MS concentration *** cycling potential window was first optimized for a model commercial Pt/C catalyst in a low-chloride concentration electrolyte,leading to a full Pt leaching efficiency(99%).A similar protocol was transferred to more technological objects:MEA aged under realistic *** MEAs were electrochemically treated without any prior GDL separation and the efficiency of the process was demonstrated.

关键词： MEA recycling Platinum electrodissolution Platinum recovery

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A reconsideration on deep sea bed disposal of high level radiological wastes–a post-Fukushima reflection on sustainable nuclear energy in Japan

A reconsideration on deep sea bed disposal of high level rad...

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作者： YOSHIKAWA Hidekazu Non Profit Organization symbio Community Forum Co.Research Inst.Applied Sciences College of Nuclear Science and Technology Harbin Engineering University

The ultimate disposal of high-level radioactive waste（HLW） is a common issue among all nuclear developing ***,this becomes especially a hard issue for sustainable nuclear energy in Japan after Fukushima Daiichi *** this paper,the difficulty of realizing underground HLW disposal in Japanese islands is first discussed from socio-political ***,revival of old idea of deep seabed disposal of HLW in Pacific Ocean is proposed as an alternative way of HLW *** this old idea had been abandoned in the past for the reason that it would violate London Convention which prohibits dumping radioactive wastes in public sea,the author will stress the merit of seabed disposal of HLW deep in Pacific Ocean not only from the view point of more safe and ultimate way of disposing HLWs（both vitrified and spent fuel） than by underground disposal,but also the emergence of new marine project by synergetic collaboration of rare-earth resource exploration from the deep sea floor in Pacific Ocean.

关键词： high-level radioactive waste disposal geological HLW disposal seabed HLW disposal rare-earth resource

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