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Theoretical calculations unveil that the formation of Os‐OsSe2 heterostructures with neutralized work function (WF) perfectly balances the electronic state between strong (Os) and weak (OsSe2) adsorbents and bidirectionally optimizes the hydrogen evolution reaction (HER) activity of Os sites, significantly reducing thermodynamic energy barrier and accelerating kinetics process. Then, heterostructural Os‐OsSe2 is constructed for the first time by a molten salt method and confirmed by in‐depth structural characterization. Impressively, due to highly active sites endowed by the charge balance effect, Os‐OsSe2 exhibits ultra‐low overpotentials for HER in both acidic (26 mV @ 10 mA cm−2) and alkaline (23 mV @ 10 mA cm−2) media, surpassing commercial Pt catalysts. Moreover, the solar‐to‐hydrogen device assembled with Os‐OsSe2 further highlights its potential application prospects. Profoundly, this special heterostructure provides a new model for rational selection of heterocomponents.

Abstract. We classify closed abelian subgroups of a compact simple Lie group of adjoint type and of type E6, E7 or E8 having centralizer of the same dimension as the dimension of the subgroup and describe Weyl groups of maximal abelian subgroups.

By calculating the symmetric subgroups Aut(u 0 ) θ and their involution classes, we classify the Klein four subgroups Γ of Aut(u 0 ) for each compact simple Lie algebra u 0 up to conjugation. This leads to a new approach of classification of semisimple symmetric pairs and Z 2 × Z 2 -symmetric spaces. We also determine the fixed point subgroup Aut(u 0 ) Γ .

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