离解(化学)
铀
废水
氢
材料科学
吸附
无机化学
离子
放射性废物
放射化学
化学
核化学
物理化学
废物管理
有机化学
冶金
工程类
作者
Min Liu,Huimei Chen,Xingrui Tang,Huanhuan Liu,Boyuan Tu,Weicong Guo,Yamin Zheng,Yan Liu,Yongjian Tang,Rong He,Wenkun Zhu
出处
期刊:Small
[Wiley]
日期:2022-02-07
卷期号:18 (11)
被引量:16
标识
DOI:10.1002/smll.202107444
摘要
As a common nuclide in radioactive wastewater, uranium (U) is generally treated by landfill, which induces the massive abandonment of uranium resources. In this work, a pulse voltammetry method for the synthesis of U single atoms on MoS2 (U/MoS2 ) nanosheets from radioactive wastewater for the electrocatalytic alkaline hydrogen evolution reaction (HER) is reported. The mass loading of U single atoms is facilely controlled with high selectivity for coexisting ions in radioactive wastewater. In the electrolyte of 1 m of KOH, U/MoS2 nanosheets with 5.2% of U single atoms exhibit relatively low overpotentials of 72 mV at 10 mA cm-2 . The mechanistic study reveals that the HER on U/MoS2 includes the water dissociation on U single atoms to form OH* and H transfer from OH* to adjacent S-edge atoms. This procedure exhibits decreased activation energy for transition state in water dissociation and optimized Gibbs free energy for H* adsorption.
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