The weak water dissociation ability and hydrogen adsorption of bulk NiSe inhibits their HER performance under alkaline conditions. Most work focused on tuning the electron structure and activity of Se sites, the role of Ni atoms in HER process is commonly ignored. In this work, we developed a Ce induced strategy to introduce Ni cationic vacancies (V) on NiSe and simultaneously regulate its morphology to form hierarchical needle-like structure. The unique nanostructure provides more exposed active sites and facilitates mass and charge transfer. After the introduction of V, Ni (te) in NiSe can be partially converted to Ni (te) with optimal e electron configuration, which improves the water dissociation barrier and facilitate the fast electron transfer during HER process. The Ni also increases the charge density around the Se atom to improve H adsorption energy on Se sites, thus improving the alkaline HER activity.

中文翻译：

---

Ce3+-诱导金属空位工程实现针状结构 NiSe2 的碱性析氢


NiSe 弱的水解离能力和氢吸附能力抑制了其在碱性条件下的 HER 性能。大多数工作集中于调节 Se 位点的电子结构和活性，Ni 原子在 HER 过程中的作用通常被忽视。在这项工作中，我们开发了一种Ce诱导策略，在NiSe上引入Ni阳离子空位（V），同时调节其形态以形成分层针状结构。独特的纳米结构提供了更多暴露的活性位点并促进质量和电荷转移。引入V后，NiSe中的Ni(te)可以部分转化为具有最佳e电子构型的Ni(te)，这改善了水解离势垒，有利于HER过程中的快速电子转移。 Ni还增加了Se原子周围的电荷密度，从而提高了Se位点上的H吸附能，从而提高了碱性HER活性。