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Temperature-Driven Morphology Control on CdSe Nanofractals and Its Influence over the Augmented Rate of H2 Evolution: Charge Separation via the S-Scheme Mechanism with Incorporated Cu3P
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-12-04 , DOI: 10.1021/acsaem.1c02790 Parnapalle Ravi 1, 2 , Dinesh Kumar Kumaravel 1 , Dinesh Subramanian 1 , Deepakkumar Thoondyaiah 1 , Vempuluru Navakoteswara Rao 3 , Shankar Muthukonda Venkatakrishnan 3 , Marappan Sathish 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-12-04 , DOI: 10.1021/acsaem.1c02790 Parnapalle Ravi 1, 2 , Dinesh Kumar Kumaravel 1 , Dinesh Subramanian 1 , Deepakkumar Thoondyaiah 1 , Vempuluru Navakoteswara Rao 3 , Shankar Muthukonda Venkatakrishnan 3 , Marappan Sathish 1, 2
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The thermodynamically controlled synthesis of dendritic fractals and nanorods via the hydrothermal reaction has been described, and their extensive photocatalytic hydrogen production properties under simulated solar light have been demonstrated. The long-range and short-range growth of CdSe monomers has been controlled by varying the reaction temperature from 100 to 200 °C. Changes in the physical and optical properties of prepared dendrites and nanorods have been evidently proven with microscopic analysis, diffuse reflectance spectroscopy, and BET analysis. A high-surface area CdSe dendritic fractal has been incorporated with bifunctional Cu3P nanoparticles that resulted in a highly efficient photocatalyst construction. Consequently, a pivotal upswing in the photocatalytic performance of CdSe was found by the formation of the S-scheme heterojunction with Cu3P. The unique properties of transition-metal phosphides kept them as a highly capable co-catalyst to replace precious metals. The physicochemical properties of the prepared materials were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The key challenge in the photocatalytic water splitting process is to develop an efficient photocatalyst not only with high chemical and photochemical stability but also with strong solar light absorption and effective charge separation ability. The co-catalyst Cu3P gives an effective path as it forms the S-scheme heterojunction with CdSe dendritic fractals. This enhances photoactivity and stability of the prepared composite. The composite made of CdSe and Cu3P showed a better rate of H2 production (92.1 mmol h–1 gcat–1) with 4% visible light to hydrogen conversion efficacy. The effects of Cu3P growth, size, and morphology of CdSe on the photocatalytic performance have been studied. Based on the material characterization and photocatalytic activity results, the working mechanism is also proposed.
中文翻译：
CdSe 纳米分形的温度驱动形态控制及其对 H2 生成速率增加的影响：通过掺入 Cu3P 的 S 型机制进行电荷分离
已经描述了通过水热反应热力学控制合成树枝状分形和纳米棒，并证明了它们在模拟太阳光下广泛的光催化制氢性能。CdSe 单体的长程和短程增长已通过将反应温度从 100 到 200 °C 变化来控制。显微分析、漫反射光谱和 BET 分析已经明显证明了制备的枝晶和纳米棒的物理和光学性质的变化。高表面积 CdSe 树枝状分形已与双功能 Cu 3 结合导致高效光催化剂结构的 P 纳米粒子。因此，通过与 Cu 3 P形成 S 型异质结发现了 CdSe 光催化性能的关键上升。过渡金属磷化物的独特性质使其成为替代贵金属的高效助催化剂。通过X射线衍射、透射电子显微镜和X射线光电子能谱对制备的材料的理化性质进行了表征。光催化水分解过程中的关键挑战是开发一种高效的光催化剂，不仅具有高化学和光化学稳定性，而且具有很强的太阳光吸收和有效的电荷分离能力。助催化剂Cu 3P 提供了一条有效的路径，因为它与 CdSe 枝晶分形形成 S 型异质结。这增强了制备的复合材料的光活性和稳定性。由 CdSe 和 Cu 3 P制成的复合材料显示出更好的 H 2产生率（92.1 mmol h –1 g cat –1），可见光到氢的转化效率为 4%。研究了 Cu 3 P 生长、尺寸和 CdSe 形貌对光催化性能的影响。基于材料表征和光催化活性结果，还提出了工作机制。
更新日期：2021-12-27
中文翻译：
CdSe 纳米分形的温度驱动形态控制及其对 H2 生成速率增加的影响：通过掺入 Cu3P 的 S 型机制进行电荷分离
已经描述了通过水热反应热力学控制合成树枝状分形和纳米棒，并证明了它们在模拟太阳光下广泛的光催化制氢性能。CdSe 单体的长程和短程增长已通过将反应温度从 100 到 200 °C 变化来控制。显微分析、漫反射光谱和 BET 分析已经明显证明了制备的枝晶和纳米棒的物理和光学性质的变化。高表面积 CdSe 树枝状分形已与双功能 Cu 3 结合导致高效光催化剂结构的 P 纳米粒子。因此，通过与 Cu 3 P形成 S 型异质结发现了 CdSe 光催化性能的关键上升。过渡金属磷化物的独特性质使其成为替代贵金属的高效助催化剂。通过X射线衍射、透射电子显微镜和X射线光电子能谱对制备的材料的理化性质进行了表征。光催化水分解过程中的关键挑战是开发一种高效的光催化剂，不仅具有高化学和光化学稳定性，而且具有很强的太阳光吸收和有效的电荷分离能力。助催化剂Cu 3P 提供了一条有效的路径，因为它与 CdSe 枝晶分形形成 S 型异质结。这增强了制备的复合材料的光活性和稳定性。由 CdSe 和 Cu 3 P制成的复合材料显示出更好的 H 2产生率（92.1 mmol h –1 g cat –1），可见光到氢的转化效率为 4%。研究了 Cu 3 P 生长、尺寸和 CdSe 形貌对光催化性能的影响。基于材料表征和光催化活性结果，还提出了工作机制。
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