Rapid reductive preparation of Np(IV) based on the electrocatalytic reaction

Kitatsuji, Yoshihiro ; Kimura, Takaumi ; Kihara, Sorin*

The behaviors of reduction of NpO $_{2}$ $^{+}$ to Np $^{4+}$ or Np $^{3+}$ by controlled potential electrolysis were studied, and a unique time course of electrolysis current was observed. It was concluded that NpO $_{2}$ $^{+}$ was reduced by two reduction processes at a platinum electrode: the chemical reaction with Np $^{3+}$ and the electrocatalytic reduction by adsorbed hydrogen atom on platinum electrode surface. NpO $_{2}$ $^{+}$ is reduced to Np $^{4+}$ more selectively and with smaller overpotential through electrocatalytic reduction process, though long electrolysis time are required to reduce NpO $_{2}$ $^{+}$ completely. To improve the electrolysis efficiency of the preparation of Np $^{4+}$ from NpO $_{2}$ $^{+}$ , the platinized platinum electrode was applied to bulk electrolysis. The rapid preparation of Np $^{4+}$ comparable to that of reversible redox reaction such as NpO $_{2}$ $^{2+}$ / NpO $_{2}$ $^{+}$ with small overpotential was achieved successfully.

Language	:	Japanese
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Meeting title	:	2009日本放射化学会年会・第53回放射化学討論会
Held date	:	2009/09
Location (city)	:	東京
Location (country)	:	日本
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Keywords	:	no keyword
Research Facility	:	プルトニウム研究1棟
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Cooperating Institute	:	京都工芸繊維大学

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Registration No. : BB20092114
JAEA Abstracts No. :
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