Lanthanum-doped α-Ni(OH)2 1D-2D-3D hierarchical nanostructures for robust bifunctional electro-oxidation

• 作者: Zimeng Wei Wenbin Sun Shanshan Liu Jindi Qi Luyao Kang Jiechen Li Shanshan Lou Junfeng Xie Bo Tang Yi Xie
• 来源期刊: 颗粒学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Invited Articles
• 页码范围: 104-111
• 页数: 8页
• 语种: 英文

摘要

The development of advanced electrocatalysts for electro-oxidation reactions has attracted much atten-tion because of the critical role of such electrocatalysts in improving the overall efficiency of coupled hydrogen production.We have developed an efficient lanthanum-doped α-Ni(OH)2 bifunctional catalyst with a 1D-2D-3D hierarchical nanostructure.It shows superior activity and stability in the anodic oxygen evolution reaction(OER)and urea oxidation reaction(UOR).Enrichment of the edge sites and conducting La doping in α-Ni(OH)2 phase enable formation and stabilization of abundant local Ni3+ions.This guaran-tees ultralow onset potentials in electro-oxidation reactions.The 1D-2D-3D hierarchical nanostructure significantly boosts the in situ generation of high-valence active species,which results in efficient and stable OER and UOR performances,and the synergistic merit of doping-induced facile reaction kinetics.Because of the structural benefits of a large surface area,charge-transfer promotion,good structural sta-bility,and bifunctionality,a 1％La-doped α-Ni(OH)2 hierarchical nanostructure gives superior OER and UOR performances with low overpotentials,large catalytic current densities,and excellent operational stability.It is therefore a promising catalyst for use in simultaneous alkaline wastewater treatment and hydrogen production.