%0 Journal Article
%T 缺陷Bi2O2CO3光催化剂的制备及应用于增强光催化CO2还原研究
Preparation of Defect-Engineered Bismuth Subcarbonate (Bi2O2CO3) Photocatalysts for Enhanced Photocatalytic CO₂ Reduction
%A 严焕
%A 赵慧平
%J Material Sciences
%P 805-815
%@ 2160-7621
%D 2025
%I Hans Publishing
%R 10.12677/ms.2025.154085
%X 通过水热法制备合成了含有缺陷的Bi2O2CO3，通过X射线粉末衍射和扫描电子显微镜确定其物相组成和形貌，通过电子顺磁共振检测到了氧空位的信号，证明了缺陷体系的成功构筑。将缺陷Bi2O2CO3用于光催化CO2还原，在模拟太阳光照射下光催化CO2还原产物CO的产率达到39.65 μmol·g−1·h−1，其催化效率是纯Bi2O2CO3的6.5倍。通过紫外漫反射光谱证明缺陷能够引起能带结构变化，使Bi2O2CO3禁带宽度变窄，实现可见光吸收和更高的载流子分离效率。通过系列光电化学实验、荧光光谱测试结果表明，氧空缺的存在可以提高材料产生光生电荷的能力，提高光生电子在材料表面的迁移速率，并抑制光生电子与空穴的复合，使参与反应的有效电荷增加，从而增强材料光催化还原CO2的能力。
Defective Bi2O2CO3 was synthesized via a hydrothermal method. The phase composition and morphology of the material were confirmed by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The presence of oxygen vacancies in the defect system was verified through electron paramagnetic resonance (EPR) spectroscopy, confirming the successful construction of the defective structure. When applied to photocatalytic CO2 reduction under simulated sunlight irradiation, the defective Bi2O2CO3 exhibited a CO production rate of 39.65 μmol·g−1·h−1, which is 6.5 times higher than that of pristine Bi2O2CO3. Ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) revealed that the defects induced modifications in the band structure, narrowing the bandgap of Bi2O2CO3. This narrowing enhanced visible light absorption and improved charge carrier separation efficiency. A series of photoelectrochemical experiments and photoluminescence (PL) spectroscopy further demonstrated that the presence of oxygen vacancies can enhance a material’s ability to generate photogenerated charges, improve the migration rate of photogenerated electrons on the material surface, and suppress the recombination of photogenerated electrons and holes. This increases the number of effective charge carriers participating in reactions, thereby strengthening the material’s capability for photocatalytic reduction of CO2.
%K 碳酸氧铋，
%K 氧空缺，
%K 空位，
%K 光催化CO2还原
Bismuth Subcarbonate
%K Oxygen Vacancies
%K Defect Engineering
%K Photocatalytic CO2 Reduction
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=112923