NiSe2 nanoparticles embedded in carbon nanowires as highly efficient and stable electrocatalyst for hydrogen evolution reaction

- The NiSe2 nanoparticles/carbon nanowires (NiSe2/C NWs) composite is prepared.
- NiSe2/C NWs is constructed by NiSe2 nanoparticles embedded in carbon nanowires.
- NiSe2/C NWs catalyst delivers superior HER performance and excellent stability.
- Superior HER activity is due to its unique NiSe2 NPs embedded in carbon nanowires.

Clean hydrogen energy through water splitting via hydrogen evolution reaction (HER) has attracted much interests. It is significant and urgent to search for low-cost non-noble metal electrocatalysts for highly efficient and stable HER. Herein, for the first time, we present a facile and cost-effective hydrothermal and selenization strategy to synthesize NiSe2 nanoparticles embedded in carbon nanowires (NiSe2/C NWs). As a HER electrocatalyst, the NiSe2/C NWs hybrid delivers outstanding catalytic performance with a very low Tafel slope of 38.7 mVdec−1, a small onset potential of ∼−144 mV (vs RHE), and a high cathode current density of 33 mA cm−2 at −250 mV (vs RHE). Moreover, it also exhibits excellent long-term stability of NiSe2/C NWs even after 2000 voltammetric sweeps. The superior HER performance of NiSe2/C NWs is attributed to its unique structure constructed by ultrafine NiSe2 nanoparticles homogenously embedded in highly conductive carbon nanowires, which can not only provide abundant HER active sites, but also enhance the conductivity between the nanoparticles. It suggests that NiSe2/C NWs hybrid is a promising candidate to replace noble metal electrocatalysts for HER.

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