The oxygen evolution reaction(OER)plays a key role in sustainable energy technologies.Herein,we report a facile Ketjenblack carbon(KB)-templated in situ synthesis method to fabricate highly dispersed bimetallic NiFe p...The oxygen evolution reaction(OER)plays a key role in sustainable energy technologies.Herein,we report a facile Ketjenblack carbon(KB)-templated in situ synthesis method to fabricate highly dispersed bimetallic NiFe phosphides as highly efficient OER electrocatalysts.The Fe dopant can effectively modulate the electronic structure and increase the oxidation degree of Ni_(2)P species.Remarkably,benefitting from the large specific surface area,optimized electronic structure and faster charge transfer kinetics,the KB-templated NiFe phosphides exhibit dramatically enhanced OER activity in alkaline medium.By tailoring the Ni/Fe ratio,(Ni_(0.5)Fe_(0.5))_(2)P/C-KB-900 delivers a current density of 20 mA cm^(-2)at an ultra-low overpotential of 296 mV and a small Tafel slope of 77 mV dec^(-1),which is much more active than commercial RuO_(2).Post-electrolysis characterization further reveals that the bimetallic phosphides are in situ converted to NiFe oxides/hydroxides during the OER,serving as the OER active sites with high activity.This work offers a novel route to design and fabricate transition metal phosphide/carbon catalysts for water splitting by controlling the morphology and composition.展开更多
基金National Natural Science Foundation of China(51672083)Program of Shanghai Academic/Technology Research Leader(18XD1401400)+4 种基金Basic Research Program of Shanghai(17JC1404702)Leading talents in Shanghai in 2018111 project(B14018)Research Foundation of China Postdoctoral Science(2017M621384)Fundamental Research Funds for the Central Universities(222201718002)。
文摘The oxygen evolution reaction(OER)plays a key role in sustainable energy technologies.Herein,we report a facile Ketjenblack carbon(KB)-templated in situ synthesis method to fabricate highly dispersed bimetallic NiFe phosphides as highly efficient OER electrocatalysts.The Fe dopant can effectively modulate the electronic structure and increase the oxidation degree of Ni_(2)P species.Remarkably,benefitting from the large specific surface area,optimized electronic structure and faster charge transfer kinetics,the KB-templated NiFe phosphides exhibit dramatically enhanced OER activity in alkaline medium.By tailoring the Ni/Fe ratio,(Ni_(0.5)Fe_(0.5))_(2)P/C-KB-900 delivers a current density of 20 mA cm^(-2)at an ultra-low overpotential of 296 mV and a small Tafel slope of 77 mV dec^(-1),which is much more active than commercial RuO_(2).Post-electrolysis characterization further reveals that the bimetallic phosphides are in situ converted to NiFe oxides/hydroxides during the OER,serving as the OER active sites with high activity.This work offers a novel route to design and fabricate transition metal phosphide/carbon catalysts for water splitting by controlling the morphology and composition.
