Department of Chemistry, College of Science, University of Hafr Al Batin, P.O. Box 1803, Hafr Al Batin 39524, Saudi Arabia.
Department of Mechanical Engineering, College of Engineering, University of Hafr Al Batin, P.O. Box 1803, Hafr Al Batin 39524, Saudi Arabia.
Molecules. 2022 Dec 7;27(24):8646. doi: 10.3390/molecules27248646.
Herein, hydrothermal fabrication of CdO-g-CN photocatalyst for a substantially better photocatalytic recital in water splitting is presented. The XRD analysis confirms the cubic phase of CdO-g-CN, whereas FTIR and UV-VIS studies revealed the presence of respective groups and a median band gap energy (2.55 eV) of the photocatalyst, respectively, which further enhanced its photo-electrochemical (PEC) properties. The SEM displays the oblong structures of g-CN sheets and nano rod-like morphology of CdO and CdO-g-CN, respectively. The HR-TEM exhibits morphology & orientation of the grains and substantiates the polycrystal-line nature of CdO-g-CN nanocomposite. The photocatalytic water-splitting concert is evaluated by PEC experiments under 1 SUN visible light irradiation. Linear sweep voltammetry (LSV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) comprehend the CdO-g-CN as a hydrogen evolution photocatalyst. A photocurrent density beyond ≥5 mA/cm is recorded from CdO-g-CN, which is 5-6 folds greater than pure CdO and g-CN. The efficient separation and transfer of charges allocated to CdO-g-CN and fabricating heterojunctions between g-CN and CdO suppresses the unfavorable electron-hole pairs recombination process. Thus, it recesses charge transfer resistance, augmenting enhanced photocatalytic performance under 1 SUN irradiation.
本文介绍了一种通过水热法制备的 CdO-g-CN 光催化剂，用于在水分解中实现更好的光催化性能。XRD 分析证实了 CdO-g-CN 的立方相，而 FTIR 和 UV-VIS 研究分别揭示了相应基团和光催化剂的中值带隙能（2.55 eV）的存在，这进一步增强了其光电化学（PEC）性能。SEM 显示了 g-CN 片的长形结构和 CdO 及 CdO-g-CN 的纳米棒状形态。高分辨率透射电子显微镜（HR-TEM）显示了晶粒的形态和取向，并证实了 CdO-g-CN 纳米复合材料的多晶性质。通过在 1 SUN 可见光照射下进行 PEC 实验评估了光催化水分解性能。线性扫描伏安法（LSV）、计时电流法（CA）和电化学阻抗谱（EIS）表明 CdO-g-CN 是一种析氢光催化剂。CdO-g-CN 记录的光电流密度超过≥5 mA/cm，是纯 CdO 和 g-CN 的 5-6 倍。CdO-g-CN 中电荷的有效分离和转移以及 g-CN 和 CdO 之间形成的异质结抑制了不利的电子-空穴对复合过程。因此，它降低了电荷转移电阻，在 1 SUN 照射下增强了光催化性能。
