Direct immobilization of an atomically dispersed Pt catalyst by suppressing heterogeneous nucleation at-40 °C
Direct immobilization of an atomically dispersed Pt catalyst by suppressing heterogeneous nucleation at-40 °C
复制标题
通过在 40 °C 温度下抑制异相成核来直接固定原子分散的 Pt 催化剂
DOI：
10.1039/c9ta07469d
复制
发表时间：
2019-12-07
影响因子：
11.9
通讯作者：
Wu, Hui
中科院分区：
文献类型：
--
作者：
Huang, Kai;Wang, Ruyue;Wu, Hui
将孤立的金属原子直接沉积到基底上是获得高性能负载型原子分散金属（SAC）的一种简单途径，但高表面能导致的团聚难以避免。在本文中，由于缓慢的成核动力学，我们证明了通过在-40 ° C下进行整个合成来获得负载在氮（N）掺杂的中孔碳（NMC）基底（Pt/NMC-LT）上的原子分散的铂（Pt）的一锅法溶液合成。我们获得了Pt/NMC-LT催化剂，其具有上级电化学析氢反应（HER）活性和稳定性，与在类似于25 ℃的RT下由溶液合成的NMC负载的占主导地位的Pt亚纳米簇催化剂（Pt/NMC-RT）和商业碳负载的Pt纳米颗粒催化剂（Pt/C）相比。对于高HER电流密度（分别为10和100 mA cm（-2）），需要较低的过电位值（仅17.0和49.8 mV），并且在5000 CV循环的加速耐久性测试（ADT）后没有观察到明显的降解。
Direct deposition of isolated metal atoms onto substrates has been recognized as a simple route to obtain high performance supported atomically dispersed metals (SACs), however, the agglomeration driven by high surface energy is difficult to avoid. Herein, we demonstrate a one-pot solution synthesis to obtain atomically dispersed platinum(Pt) supported on nitrogen (N)-doped mesoporous carbon (NMC) substrates (Pt/NMC-LT) by conducting the whole synthesis at -40 degrees C, owing to the sluggish nucleation kinetics. We obtained the Pt/NMC-LT catalyst with superior electrochemical hydrogen evolution reaction (HER) activity and stability, in comparison with the NMC supported dominant Pt sub-nanometer cluster catalyst from solution synthesis at RT similar to 25 degrees C (Pt/NMC-RT) and commercial carbon supported Pt nanoparticle catalysts (Pt/C). Lower over-potential values (only 17.0 and 49.8 mV) are needed for high HER current densities (10 and 100 mA cm(-2), respectively), and no obvious degradation is observed after an accelerated durability test (ADT) for 5000 CV cycles.