State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Mar 1;9(8):7154-7159. doi: 10.1021/acsami.6b15719. Epub 2017 Feb 15.
For the first time, self-assembled coral-like hierarchical architecture constructed by NiSe nanocrystals has been synthesized via a facile one-pot DMF-solvothermal method. Compared with hydrothermally synthesized NiSe (H-NiSe), the DMF-solvothermally synthesized nanocrystalline NiSe (DNC-NiSe) exhibits superior performance of hydrogen evolution reaction (HER): it has a very low onset overpotential of ∼136 mV (vs RHE), a very high cathode current density of 40 mA/cm at ∼200 mV (vs RHE), and an excellent long-term stability; most importantly, it delivers an ultrasmall Tafel slope of 29.4 mV dec, which is the lowest ever reported for NiSe-based catalysts, and even lower than that of precious platinum (Pt) catalyst (30.8 mV dec). The superior HER performance of DNC-NiSe is attributed to the unique self-assembled coral-like network, which is a benefit to form abundant active sites and facilitates the charge transportation due to the inherent high conductivity of NiSe nanocrystals. The DNC-NiSe is promising to be a viable alternative to precious metal catalysts for hydrogen evolution.
首次通过简便的一锅 DMF-溶剂热法合成了由 NiSe 纳米晶自组装而成的珊瑚状分级结构。与水热合成的 NiSe（H-NiSe）相比，DMF-溶剂热合成的纳米晶 NiSe（DNC-NiSe）在析氢反应（HER）中表现出优异的性能：其起始过电位非常低，约为 136 mV（相对于 RHE），在约 200 mV（相对于 RHE）时具有非常高的阴极电流密度 40 mA/cm，并且具有出色的长期稳定性；最重要的是，它具有超低的 Tafel 斜率 29.4 mV dec，这是迄今为止报道的基于 NiSe 的催化剂中最低的，甚至低于贵金属铂（Pt）催化剂（30.8 mV dec）。DNC-NiSe 优异的 HER 性能归因于独特的自组装珊瑚状网络，这有利于形成丰富的活性位点，并由于 NiSe 纳米晶固有的高导电性而有利于电荷传输。DNC-NiSe 有望成为替代贵金属催化剂用于析氢的可行选择。
