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In this study, a three-dimensional (3D) nano/micropeony-like hierarchical Cu 2−x Se has been synthesized by a one-step solvothermal method with ethylenediamine and ethylene glycol as mixed solvents. The 3D copper foam was selected as sacrificial template, and the aqueous solution of mixture Na 2 SeO 3 and Na 2 Se was chosen as a suitable selenium source for this reaction...
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