Photocatalytic H2 evolution over MnCoSe2 decorated red phosphorus with S-scheme charge transfer route

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2024-10-10 DOI:10.1016/j.jphotochem.2024.116051

Jiale Wang , Jingzhuo Tian , Jun Fan , Haipeng Teng , Enzhou Liu

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Abstract

The improvement of charge separation and utilization efficiency plays a vital role in attaining efficient photocatalytic conversion processes. In this study, MnCoSe₂/RP heterojunctions were synthesized using the hydrothermal method and solvent evaporation method. The investigation indicates that the H₂ evolution rate (r_H2) of 3 wt% MnCoSe₂/RP can reach up to 2223.9 μmol·g⁻¹·h⁻¹ in 0.35 M Na₂S/0.25 M Na₂SO₃ solution, which is 9.3 and 19.5 times higher than those of the RP (214.8 μmol·g⁻¹·h⁻¹) and MnCoSe₂ (108.4 μmol·g⁻¹·h⁻¹), respectively, as well as better than that of 3 wt% MnSe₂/RP and 3 wt% CoSe₂/RP prepared under similar conditions. This enhancement is ascribed to the synergistic promoting effect exerted by Co and Mn, leading to fast photoelectric response, low charge transfer resistance, efficient electron-hole separation capability, and suitable H₂ evolution overpotential. Besides, it is found that the charge transfer between MnCoSe₂ and RP follow S-scheme route, which can maintain the active electrons and holes with good redox properties. Furthermore, the r_H2 can be further improved by adding appropriate amount of (NH₄)₂HPO₄, which can induce more H⁺ for H₂ evolution by HPO₄⁻ dissociation. Overall, this work shows that transition metal selenide can be a good candidate to form RP-based S-scheme photocatalyst for solar photocatalysis.

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用 S 型电荷转移路线在 MnCoSe2 装饰的红磷上光催化 H2 演化

提高电荷分离和利用效率对于实现高效光催化转换过程至关重要。本研究采用水热法和溶剂蒸发法合成了 MnCoSe2/RP 异质结。研究表明，在 0.35 M Na2S/0.25 M Na2SO3 溶液中，3 wt% MnCoSe2/RP 的 H2 演化率（rH2）可达 2223.9 μmol-g-1-h-1，分别是 RP 和 MnCoSe2/RP 的 9.3 倍和 19.5 倍。5 倍，也优于在类似条件下制备的 3 wt% MnSe2/RP 和 3 wt% CoSe2/RP。这种增强归因于 Co 和 Mn 发挥的协同促进作用，导致了快速的光电响应、低电荷转移电阻、高效的电子-空穴分离能力和合适的 H2 演化过电位。此外，研究还发现 MnCoSe2 与 RP 之间的电荷转移遵循 S 型路线，可保持活性电子和空穴，具有良好的氧化还原特性。此外，通过添加适量的 (NH4)2HPO4，可进一步提高 rH2，从而诱导更多的 H+ 通过 HPO4- 解离进化出 H2。总之，这项研究表明，过渡金属硒可以很好地形成基于 RP 的 S 型光催化剂，用于太阳能光催化。

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.