The design of a highly efficient electrocatalyst for oxygen evolution reaction(OER)is of great significance to the clean energy conversion system.Herein,novel Mo-doped NiFe phosphide(Mo-NiFe-P)nanoflowers are develope...The design of a highly efficient electrocatalyst for oxygen evolution reaction(OER)is of great significance to the clean energy conversion system.Herein,novel Mo-doped NiFe phosphide(Mo-NiFe-P)nanoflowers are developed as robust high-activity catalysts for OER via the phosphidation of MoO_(4)^(2−)intercalated NiFe-layered double hydroxide(NiFe-LDH).The introduction of high valence Mo can significantly promote the catalytic activity of OER because of the strong electronic interactions with Ni and Fe.By tailoring the amount of molyb-date intercalated into NiFe-LDH,the optimal phosphide shows outstanding overpotentials of 261 and 272 mV to drive current densities of 50 and 100 mA cm−2 in 1 mol L−1 KOH.This work demonstrates that the amount of molybdate influences the structure of phosphide prepared by the intercalated LDHs and also affects the elec-trocatalytic behavior.In addition,density functional theory(DFT)calculations show that introducing Mo could alter the intrinsic electronic structure of NiFe-P,which,in turn,could accelerate the reaction kinetics.This approach could be extended to the preparation of other cost-efficient phosphides for OER.展开更多
文摘The design of a highly efficient electrocatalyst for oxygen evolution reaction(OER)is of great significance to the clean energy conversion system.Herein,novel Mo-doped NiFe phosphide(Mo-NiFe-P)nanoflowers are developed as robust high-activity catalysts for OER via the phosphidation of MoO_(4)^(2−)intercalated NiFe-layered double hydroxide(NiFe-LDH).The introduction of high valence Mo can significantly promote the catalytic activity of OER because of the strong electronic interactions with Ni and Fe.By tailoring the amount of molyb-date intercalated into NiFe-LDH,the optimal phosphide shows outstanding overpotentials of 261 and 272 mV to drive current densities of 50 and 100 mA cm−2 in 1 mol L−1 KOH.This work demonstrates that the amount of molybdate influences the structure of phosphide prepared by the intercalated LDHs and also affects the elec-trocatalytic behavior.In addition,density functional theory(DFT)calculations show that introducing Mo could alter the intrinsic electronic structure of NiFe-P,which,in turn,could accelerate the reaction kinetics.This approach could be extended to the preparation of other cost-efficient phosphides for OER.
