Metal–organic frameworks(MOFs)have emerged as alternative OER catalysts due to their alkaline hydrolysis from high“molecular-scale pores”to high“nano-scale porosity”in alkaline solution,and then in situ self-reco...Metal–organic frameworks(MOFs)have emerged as alternative OER catalysts due to their alkaline hydrolysis from high“molecular-scale pores”to high“nano-scale porosity”in alkaline solution,and then in situ self-reconstruction from MOFs to metal hydroxides.Herein,quantitative iron ions are spontaneously adsorbed on the surface of Ni-MOFs with negative charge effect and are directly used as OER catalysts.Based on the cation regulation and the in situ alkaline hydrolysis of MOFs in 1.0 M KOH solution,the multilayer bimetallic nickel irons hydroxide with enriched active sites were intended to be the real active phase.At the same time,the introduction of iron cation will also produce a bimetallic synergy,thus achieving superior OER catalytic activity(η_(50)=280 mV).This novel strategy provides an avenue for the exploration of catalytic mechanisms and directional design of MOF-based catalysts.展开更多
基金supported by Tianjin Undergraduate Innovative Research program(202010055420)the MOE(IRT13R30)and the NCC fund(grant NCC2020PY02).
文摘Metal–organic frameworks(MOFs)have emerged as alternative OER catalysts due to their alkaline hydrolysis from high“molecular-scale pores”to high“nano-scale porosity”in alkaline solution,and then in situ self-reconstruction from MOFs to metal hydroxides.Herein,quantitative iron ions are spontaneously adsorbed on the surface of Ni-MOFs with negative charge effect and are directly used as OER catalysts.Based on the cation regulation and the in situ alkaline hydrolysis of MOFs in 1.0 M KOH solution,the multilayer bimetallic nickel irons hydroxide with enriched active sites were intended to be the real active phase.At the same time,the introduction of iron cation will also produce a bimetallic synergy,thus achieving superior OER catalytic activity(η_(50)=280 mV).This novel strategy provides an avenue for the exploration of catalytic mechanisms and directional design of MOF-based catalysts.
