Guo Hengyi, Wang Lingtao, Liu Xuzhao, Mativenga Paul, Liu Zhu, Thomas Andrew G
Department of Materials, School of Natural Science, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
The Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Nanomaterials (Basel). 2025 Jan 6;15(1):78. doi: 10.3390/nano15010078.
Platinum (Pt)-based heterogeneous catalysts show excellent performance for the electrocatalytic hydrogen evolution reaction (HER); however, the high cost and earth paucity of Pt means that efforts are being directed to reducing Pt usage, whilst maximizing catalytic efficiency. In this work, a two-step laser annealing process was employed to synthesize Pt single-atom catalysts (SACs) on a MOF-derived carbon substrate. The laser irradiation of a metal-organic framework (MOF) film (ZIF67@ZIF8 composite) by rapid scanning of a ns pulsed infrared (IR; 1064 nm) laser across the freeze-dried MOF resulted in a metal-loaded graphitized film. This was followed by loading this film with chloroplatinic acid (HPtCl), followed by further irradiation with an ultraviolet (UV; 355 nm) laser, resulting in pyrolysis of HPtCl to form the SAC, along with a further reduction of the MOF to form a Pt-decorated laser-induced annealed MOF (Pt-LIA-ZIF8@ZIF67). The Pt-LIA-ZIF8@ZIF67 catalyst with a Pt loading of 0.86 wt. % exhibited exceptionally high activity for the HER in acidic conditions. The atomically dispersed Pt on the carbon substrate exhibited a small overpotential of 68.8 mV at 10 mA cm for the hydrogen evolution reaction with a mass activity 20.52 times that of a commercial Pt/C catalyst at an overpotential of 50 mV vs. RHE. Finally, we note that the synthesis method is simple, fast, and versatile, and potentially scalable for the mass production of SACs for electrocatalytic applications.
基于铂（Pt）的非均相催化剂在电催化析氢反应（HER）中表现出优异的性能；然而，Pt的高成本和地球储量稀缺意味着人们正在努力减少Pt的使用，同时最大限度地提高催化效率。在这项工作中，采用两步激光退火工艺在MOF衍生的碳基底上合成Pt单原子催化剂（SACs）。通过对冻干的MOF快速扫描纳秒脉冲红外（IR；1064 nm）激光对金属有机框架（MOF）薄膜（ZIF67@ZIF8复合材料）进行激光辐照，得到了负载金属的石墨化薄膜。接着用氯铂酸（HPtCl）负载该薄膜，然后用紫外（UV；355 nm）激光进一步辐照，导致HPtCl热解形成SAC，同时MOF进一步还原形成Pt修饰的激光诱导退火MOF（Pt-LIA-ZIF8@ZIF67）。Pt负载量为0.86 wt.%的Pt-LIA-ZIF8@ZIF67催化剂在酸性条件下对HER表现出极高的活性。碳基底上原子分散的Pt在析氢反应中，在10 mA cm时过电位为68.8 mV，在相对于可逆氢电极（RHE）过电位为50 mV时，质量活性是商业Pt/C催化剂的20.52倍。最后，我们注意到该合成方法简单、快速且通用，并且有可能扩大规模用于电催化应用的SACs的大规模生产。
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