4.7 Article

Hydrothermally-assisted recovery of Yttria- stabilized zirconia (YSZ) from end-of-life solid oxide cells

期刊

出版社

ELSEVIER
DOI: 10.1016/j.susmat.2022.e00473

关键词

Solid oxide cell; End-of-life; Yttria-stabilized zirconia (YSZ); Recovery; Hydrothermal treatment; Selective Ni leaching

资金

  1. Clean Hydrogen Partnership [101007216]
  2. European Unions Horizon 2020 Research and Innovation program, Hydrogen Europe and Hydrogen Europe Research

向作者/读者索取更多资源

In this study, an optimized recycling process was developed to recover YSZ from EoL SOC components. The multi-step procedure involved milling, hydrothermal treatment, and acid-assisted leaching, which resulted in YSZ powders with defined specifications. The hydrothermal treatment step played a crucial role in promoting the disaggregation of sintered powders and increasing the specific surface area. Acid-assisted leaching allowed for the full extraction of nickel while retaining the crystallinity of YSZ.
Effective and scalable recycling strategies for the recovery of critical raw materials are yet to be validated for solid oxide cells (SOCs) technologies. The current study aimed at filling this gap by developing optimized recycling processes for the recovery of Yttria-stabilized Zirconia (YSZ) from End-of-Life (EoL) SOC components, in view of using the recovered ceramic phase in cell remanufacturing. A multi-step procedure, including milling, hydrothermal treatment (HT), and acidic-assisted leaching of nickel from composite Ni-YSZ materials, has been implemented to obtain recovered YSZ powders with defined specifications, in terms of particle size distribution, specific surface area, and chemical purity. The overall optimized procedure includes a pre-milling step (6 h) of the EoL composite materials, and a hydrothermal (HT) treatment at 200 ? for 4 h to further disaggregate the sintered composite, followed by selective oxidative leaching of Ni2+ by HNO3 solution at 80 ? for 2 h. In particular, the intermediate HT step was assessed to play an essential role in promoting the disaggregation of the sintered powders, with a related increase of specific surface area (up to 13 m2 g-1) and the overall reduction of the primary particle aggregates. The acid-assisted leaching allowed to fully extract Nickel from the composite Ni-YSZ powders, with retention of YSZ crystallinity and negligible loss of Zr and Y, as revealed by ICP analysis on the recovered supernatants.The developed multi-step pathway offers a promising strategy to recover valuable YSZ materials for the re -manufacturing of SOCs components, with the aim to boost a circular economy approach in the field of fuel -cell and hydrogen (FCH) technologies.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据