通过脉冲激光从 Ti2C3TX MXene 到 Pt 装饰的 TiO2@TiC 核壳，在重塑修饰中加速析氢动力学,ACS Nano

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通过脉冲激光从 Ti2C3TX MXene 到 Pt 装饰的 TiO2@TiC 核壳，在重塑修饰中加速析氢动力学
ACS Nano ( IF 15.8 ) Pub Date : 2023-03-06 , DOI: 10.1021/acsnano.2c12638
Chae Eun Park ₁ , Gyoung Hwa Jeong ₂ , Jayaraman Theerthagiri ₁ , Hyeyeon Lee ₁ , Myong Yong Choi _{1,

2}

Affiliation

纳米催化剂在特定面上的相工程不仅对于提高催化活性至关重要，而且对于深入了解基于面的相工程对电催化反应的影响也至关重要。在这项研究中，我们成功地重塑了二维 (2D) MXene (Ti ₃ C ₂ T _x )，该二维(Ti 3 C 2 T x ) 是通过液态脉冲激光照射 (PLIL) 工艺蚀刻 Ti ₃ AlC _{2 MAX 获得的。}我们在尺寸为 200-350 nm 的球体中制备了 TiO ₂ @TiC 核壳结构，然后将～2 nm 的超小 Pt NPs 装饰在 TiO _{2的表面上}@TiC core–shell 使用单步PLIL 方法。这些进步使得在可见光照射下电催化析氢反应 (HER) 活性显着增加。确定了最佳 Pt 载量对 PLIL 时间的影响，所得 Pt/TiO ₂ @TiC/Pt-5 分钟样品展示了出色的电化学和光电化学性能。_{Pt/TiO 2} @TiC/Pt-5 min 催化剂上的光电化学 HER 活性在 10 mA/cm ^{2时表现出 48 mV 的低过电势}54.03 mV/dec 的超低塔菲尔斜率和超过 50 h 的出色稳定性，其制氢活性甚至优于商业 Pt/C 催化剂（55 mV、62.45 mV/dec）。该研究不仅为激光相关相工程提供了潜在的可能性，而且为高效纳米催化剂的合理设计和制造提供了可靠的策略。

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Moving beyond Ti2C3Tx MXene to Pt-Decorated TiO2@TiC Core–Shell via Pulsed Laser in Reshaping Modification for Accelerating Hydrogen Evolution Kinetics

Phase engineering of nanocatalysts on specific facets is critical not only for enhancing catalytic activity but also for intensely understanding the impact of facet-based phase engineering on electrocatalytic reactions. In this study, we successfully reshaped a two-dimensional (2D) MXene (Ti₃C₂T_x) obtained by etching Ti₃AlC₂ MAX via a pulsed laser irradiation in liquid (PLIL) process. We produced a TiO₂@TiC core–shell structure in spheres with sizes of 200–350 nm, and then ∼2 nm ultrasmall Pt NPs were decorated on the surface of the TiO₂@TiC core–shell using the single-step PLIL method. These advances allow for a significant increase in electrocatalytic hydrogen evolution reaction (HER) activity under visible light illumination. The effect of optimal Pt loading on PLIL time was identified, and the resulting Pt/TiO₂@TiC/Pt-5 min sample demonstrated outstanding electrochemical and photoelectrochemical performance. The photoelectrochemical HER activity over Pt/TiO₂@TiC/Pt-5 min catalyst exhibits a low overpotential of 48 mV at 10 mA/cm² and an ultralow Tafel slope of 54.03 mV/dec with excellent stability of over 50 h, which is hydrogen production activity even superior to that of the commercial Pt/C catalysts (55 mV, 62.45 mV/dec). This investigation not only serves as a potential for laser-dependent phase engineering but also provides a reliable strategy for the rational design and fabrication of highly effective nanocatalysts.

更新日期：2023-03-06

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