In:
ChemElectroChem, Wiley, Vol. 5, No. 19 ( 2018-10), p. 2738-2746
Abstract:
To acquire production uranium and uranium‐iron alloys, a mix‐reduction of a direct electrochemical reduction and Li co‐deposition with triuranium octaoxide (U 3 O 8 ) in molten LiCl‐KCl salt was investigated by a sequence of electrochemical experiments using cyclic voltammetry (CV), square wave voltammetry (SWV), open circuit chronopotentiometry (OCP) and chronopotentiometry (CP). The electrochemical curves on molybdenum electrode reveal that the reduction of U 3 O 8 on the surface of cathode is a two‐step process and the reduction potential of U 3 O 8 to UO 2 is −1.70 V, and of UO 2 to U is −2.45 V. The electrochemical curves on the stainless‐steel electrode, or with FeCl 3 additive, demonstrate that different U−Fe alloys are generated as Fe 2 U and FeU 6 at −0.90 V and −1.20 V, respectively. Our study proves the feasibility of mix‐reduction to prepare U metal in LiCl−KCl−U 3 O 8 melts at −2.60 V for 480 min, and only FeU 6 alloy forms in LiCl−KCl−U 3 O 8 −FeCl 3 melts at −2.60 V for 480 min on the molybdenum cathode, respectively. Electrolysate U and FeU 6 are proved by XRD, and SEM‐EDS analysis confirms more negative potential −3.20 V for 4 h on 304 stainless steel cathode accelerates the formation of the U−Fe phase with obvious Li co‐deposition.
Type of Medium:
Online Resource
ISSN:
2196-0216
,
2196-0216
DOI:
10.1002/celc.201800573
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2724978-5
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