Interface coupling induced built-in electric fields boost electrocatalytic oxygen evolution reaction over MOF@LDHs core-shell nanocones

Constructing built-in electric fields can guide the efficient electron transfer, which will benefit for the modification of electronic structure to substantially promote the intrinsically catalytic activity toward oxygen evolution reaction (OER). Here, a p-p heterojunction composed of metal-organic frameworks (MOFs) and layered double hydroxides (LDHs) with rich heterointerfaces is reported. As a proof of concept, the as-prepared MOF@LDH nanocones are demonstrated to be highly effective for OER electrocatalysis, delivering a current density of 10 mA·cm−2 with the overpotential of merely 270 mV, along with excellent electrochemical cycle stability. The built-in electric field in such p-p heterojunction can boost electron transfer in OER. More importantly, the presence of rich heterointerfaces also endow oxygen intermediates with a balanced adsorption/desorption capability, thus achieving superb electrocatalytic performance. This work realizes the effective integration of built-in electric fields and heterointerface effect for synergistically promoting catalytic OER performance.