State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , PR China.
ACS Appl Mater Interfaces. 2018 Mar 21;10(11):9460-9467. doi: 10.1021/acsami.8b00211. Epub 2018 Mar 9.
The exploration of highly efficient non-noble metal electrocatalysts for hydrogen evolution reaction (HER) under alkaline conditions is highly imperative but still remains a great challenge. In this work, the nanohybrid of carbon quantum dots and molybdenum phosphide nanoparticle (CQDs/MoP) has been firstly demonstrated as an efficient alkaline HER electrocatalyst. The CQDs/MoP nanohybrid is readily prepared through a charge-directed self-assembly of CQDs with phosphomolybdic acid (HPMoO) at the molecular level, followed by facile phosphatizing at 700 °C. The introduction of CQDs greatly helps to alleviate the agglomeration and surface oxidation of MoP nanoparticles and ensures each MoP nanoparticle to be electronically addressed, thus significantly enhancing the intrinsic catalytic activity of MoP. The optimized CQDs/MoP exhibits high-efficiency synergistic catalysis toward HER in 1 M KOH electrolyte with a low onset potential of -0.08 V and a small Tafel slope of 56 mV dec as well as high durability with negligible current loss for at least 24 h.
在碱性条件下探索高效的非贵金属析氢反应（HER）电催化剂是非常必要的，但仍然是一个巨大的挑战。在这项工作中，首次证明了碳量子点和磷钼酸纳米粒子的纳米杂化物（CQDs/MoP）是一种有效的碱性 HER 电催化剂。CQDs/MoP 纳米杂化物是通过在分子水平上将 CQDs 与磷钼酸（HPMoO）进行电荷导向自组装，然后在 700°C 下进行简便的磷化反应来制备的。CQDs 的引入有助于缓解 MoP 纳米颗粒的团聚和表面氧化，并确保每个 MoP 纳米颗粒都能进行电子寻址，从而显著提高 MoP 的本征催化活性。优化后的 CQDs/MoP 在 1 M KOH 电解质中表现出高效的协同催化HER 性能，具有低起始电位-0.08 V 和小的 Tafel 斜率 56 mV dec，以及至少 24 小时的高耐久性，电流损失可忽略不计。
