The design of electrocatalysts with excellent performance and low cost is of great significance for the electrocatalytic water splitting. NiSe2 has been widely concerned because of its suitable adsorption energy and adjustable electronic structure for hydrogen evolution reaction (HER). Here, a hollow spherical NiSe2 catalyst was designed and prepared by the hydrothermal method. Thanks to the unique three-dimensional (3D) open configuration and favorable active components, it exhibits superior catalytic activity for HER. It delivers an overpotential of 330[Formula: see text]mV at the current density of 10[Formula: see text]mA[Formula: see text]cm[Formula: see text], corresponding to the Tafel slope of 128[Formula: see text]mV[Formula: see text]dec[Formula: see text]. This work demonstrates that the 3D hollow structure with large specific surface and rich internal space can effectively improve the mass transfer efficiency and electron transfer. This work may provide a controllable way for the design of hollow structure catalysts.

中文翻译：

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可控合成空心 NiSe2 球作为析氢反应的活性电催化剂

设计性能优良、成本低廉的电催化剂对电催化水分解具有重要意义。镍硒2因其合适的吸附能和可调节的电子结构用于析氢反应（HER）而受到广泛关注。这里，一个空心球形 NiSe2采用水热法设计和制备催化剂。由于独特的三维 (3D) 开放构型和有利的活性成分，它对 HER 表现出优异的催化活性。在电流密度为 10[公式：见文本]mA[公式：见文本]cm[公式：见文本]时，它提供 330[公式：见文本]mV 的过电位，对应于 128 的塔菲尔斜率[公式：见文本]mV[公式：见文本]d​​ec[公式：见文本]。这项工作表明，具有大比表面和丰富内部空间的3D中空结构可以有效地提高传质效率和电子转移。这项工作可能为中空结构催化剂的设计提供一种可控的方式。