 The study analyzed the function of internal polarization field in Ni2P slash FEP2 via hydroxyl spillover effect to optimize absorption energy of oxygen intermediates on Ni active site and boost the zygen evolution reaction process, which can be amplified in low concentration alkaline electrolyte environment for application in Ni and exchange membrane water electrolyzer systems. This article was authored by Jingyi Xia, Fuli Wang, Yanan Zhou, and others.