Developing efficient non-noble-metal electrocatalysts for overall water-splitting is still a great challenge for future renewable energy conversion and storage systems.Herein,cross-linked Al-doped CoP nanosheets on th...Developing efficient non-noble-metal electrocatalysts for overall water-splitting is still a great challenge for future renewable energy conversion and storage systems.Herein,cross-linked Al-doped CoP nanosheets on three-dimensional(3D)nickel foam(Al-CoP/NF)are synthesized by a simple low-temperature phosphidation method using a CoAl layer double hydroxide precursor and exhibit high activity and good stability towards the hydrogen evolution reaction(HER)at all pH values,with low overpotentials of 51 mV(0.5 M H_(2)SO_(4),pH=0),66 mV(1.0 M KOH,pH=14)and 83 mV(1.0 M PBS,pH=7)to achieve a current density of 10 mA cm^(−2).In addition,this self-supported electrode shows excellent activity towards the oxygen evolution reaction(OER)in alkaline media,affording an anodic current density of 10 mA cm^(−2)at an overpotential of 330 mV.As a result,Al-CoP/NF as a bifunctional electrocatalyst can afford a current density of 10 mA cm^(−2)at a cell voltage of 1.63 V over a long-term overall water splitting operation in 1.0 M KOH.The remarkable catalytic performance of the self-supported Al-CoP/NF is closely associated with its outstanding structural advantages such as a 3D conductive framework,fascinating porous characteristics and Al doping.This study might open up a new route to improve the activity and durability of selfsupported electrocatalysts by heteroatom doping.展开更多
基金supported by the National Natural Science Foundation of China(21421001,21573115,and 21766026)the Natural Science Foundation of Tianjin(17JCYBJC17100)+2 种基金the 111 project(B12015)the Fundamental Research Funds for the Central Universities(63185015)the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2017-K13).
文摘Developing efficient non-noble-metal electrocatalysts for overall water-splitting is still a great challenge for future renewable energy conversion and storage systems.Herein,cross-linked Al-doped CoP nanosheets on three-dimensional(3D)nickel foam(Al-CoP/NF)are synthesized by a simple low-temperature phosphidation method using a CoAl layer double hydroxide precursor and exhibit high activity and good stability towards the hydrogen evolution reaction(HER)at all pH values,with low overpotentials of 51 mV(0.5 M H_(2)SO_(4),pH=0),66 mV(1.0 M KOH,pH=14)and 83 mV(1.0 M PBS,pH=7)to achieve a current density of 10 mA cm^(−2).In addition,this self-supported electrode shows excellent activity towards the oxygen evolution reaction(OER)in alkaline media,affording an anodic current density of 10 mA cm^(−2)at an overpotential of 330 mV.As a result,Al-CoP/NF as a bifunctional electrocatalyst can afford a current density of 10 mA cm^(−2)at a cell voltage of 1.63 V over a long-term overall water splitting operation in 1.0 M KOH.The remarkable catalytic performance of the self-supported Al-CoP/NF is closely associated with its outstanding structural advantages such as a 3D conductive framework,fascinating porous characteristics and Al doping.This study might open up a new route to improve the activity and durability of selfsupported electrocatalysts by heteroatom doping.
