Cu₂O micro-sized crystals was synthesized through a hydrothermal reaction of CuCl₂ and NaOH solution adding ascorbic acid (AH₂) as reductant. The morphology changed from truncated octahedral to six-corners-{1 1 1} truncated octahedral along with the increasing molar ratio of NaOH/CuCl₂. The preferential growth rates of the {1 1 1} and {1 1 0} faces affected by the concentration of [Cu(OH)₄]²⁻, resulting in the morphological evolution. The sufficient AH₂ has an etching effect to form a quasi-spherical Cu₂O structure. The highly-truncated octahedral Cu₂O with the dominant {1 1 0} faces has higher adsorption and also photocatalytic activity with a methyl orange (MO) degradation rate of 90.3% under visible light. It’s proposed that the {1 1 0} faces of Cu₂O microcrystals possess higher photocatalytic activity than {1 1 1} faces, and are even more active than the {1 0 0} faces.

通过CuCl ₂和NaOH溶液的水热反应，添加抗坏血酸（AH ₂）作为还原剂，合成了Cu ₂ O超细晶体。随着NaOH / CuCl ₂摩尔比的增加，形态从截断的八面体变为六角形的{1 1 1}截断的八面体。{1 1 1}和{1 1 0}面的优先生长速率受[Cu（OH）₄ ] ^2-的浓度影响，导致其形态演化。足够的AH ₂具有蚀刻作用以形成准球形的Cu ₂ O结构。高度截断的八面体铜      具有{1  1  0}主面的₂ O在可见光下具有更高的吸附力和光催化活性，甲基橙（MO）的降解率为90.3％。提出Cu ₂ O微晶的{1  1  0}面比{1 1 1}面具有更高的光催化活性，甚至比{1 0 0}面具有更高的活性。