Cobalt phosphides(CoP_(x))as a representative of transition metal phosphide(TMP)catalysts show great potential for highly-efficient electrocatalytic water splitting for H_(2) production.However,the current synthetic s...Cobalt phosphides(CoP_(x))as a representative of transition metal phosphide(TMP)catalysts show great potential for highly-efficient electrocatalytic water splitting for H_(2) production.However,the current synthetic strategies of CoP_(x) are complex and time-consuming.Herein,a novel,facile and fast molten salt strategy for one-step synthesis of CoP_(x)(CoP/Co_(2)P)was first proposed.Moreover,the molten salt’s strong polarization force endows CoP_(x) with abundant phosphorus vacancy(PV)defects.The synthesized CoP_(x) show impressive catalytic activities towards both the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)under alkaline conditions.This enables the overall water splitting to reach the current densities of 10 and 100 mA cm^(-2) driven by only 1.75 and 1.90 V voltage,respectively.Mechanism investigation reveals that PV defects lead to the optimization of the electronic structure,decreased energy barriers of intermediates’formation,and enhanced electronic conductivity,all of which boost the electrocatalytic activity.This study provides a paradigm of using molten salt for the synthesis of advanced TMPs,which not only simplifies the synthetic procedures,but also provides insight into defect engineering that involves the use of molten salt medium to obtain a better activity.展开更多
基金financially supported by the National Natural Science Foundation of China(22176046)the State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology)(2021TS13)+2 种基金the Shenzhen Science and Technology Program(KQTD20190929172630447 and JCYJ20210324124209025)the Natural Science Foundation of Guangdong Province(2022A1515012016)the China Postdoctoral Science Foundation(2021M700997).
文摘Cobalt phosphides(CoP_(x))as a representative of transition metal phosphide(TMP)catalysts show great potential for highly-efficient electrocatalytic water splitting for H_(2) production.However,the current synthetic strategies of CoP_(x) are complex and time-consuming.Herein,a novel,facile and fast molten salt strategy for one-step synthesis of CoP_(x)(CoP/Co_(2)P)was first proposed.Moreover,the molten salt’s strong polarization force endows CoP_(x) with abundant phosphorus vacancy(PV)defects.The synthesized CoP_(x) show impressive catalytic activities towards both the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)under alkaline conditions.This enables the overall water splitting to reach the current densities of 10 and 100 mA cm^(-2) driven by only 1.75 and 1.90 V voltage,respectively.Mechanism investigation reveals that PV defects lead to the optimization of the electronic structure,decreased energy barriers of intermediates’formation,and enhanced electronic conductivity,all of which boost the electrocatalytic activity.This study provides a paradigm of using molten salt for the synthesis of advanced TMPs,which not only simplifies the synthetic procedures,but also provides insight into defect engineering that involves the use of molten salt medium to obtain a better activity.
