For the first time, self-assembled graphene/Ni_0.85Se-SnO₂ (GNS) microspheres, which are constructed by homogenously distribution of Ni_0.85Se-SnO₂ nanoparticles wrapped by reduced graphene oxide nanosheets, have been synthesized by a facile and low-cost hydrothermal method. Due to the rationally designed nanoarchitecture and the high conductivity of SnO₂ and graphene, the GNS electrocatalyst delivers excellent performance for hydrogen evolution reaction (HER): it exhibits a quite low Tafel slope of 35.8 mV dec⁻¹ and a high cathode current density of 25 mA cm⁻² at overpotential of 290 mV (vs RHE); it shows outstanding long-term stability even after 1000 CV cycles in acid solution. This study elucidates a rational construction design and a facile large-scale synthesis method of non-precious HER electrocatalysts with excellent HER performance to replace Pt-based electrocatalysts.

首次，通过简便，低廉的合成方法制备了自组装的石墨烯/ Ni _0.85 Se-SnO ₂（GNS）微球，该球是通过均匀地分布被还原的氧化石墨烯纳米片包裹的Ni _0.85 Se-SnO ₂纳米颗粒构成的。成本的水热法。由于合理设计的纳米结构以及SnO ₂和石墨烯的高电导率，GNS电催化剂为析氢反应（HER）提供了出色的性能：它的Tafel斜率非常低，为35.8 mV dec ^-1，阴极电流密度很高。 25 mA厘米^-2在290 mV（vs RHE）的超电势下; 即使在酸性溶液中经过1000 CV循环后，它仍具有出色的长期稳定性。本研究阐明了具有优异HER性能的非贵金属HER电催化剂替代Pt基电催化剂的合理结构设计和简便的大规模合成方法。