The development of earth-abundant electrocatalysts for efficient water oxidation under moderate conditions is highly desired but still a big challenge.In this communication,we demonstrate the topotactic conversion of ...The development of earth-abundant electrocatalysts for efficient water oxidation under moderate conditions is highly desired but still a big challenge.In this communication,we demonstrate the topotactic conversion of a nickel phosphide nanoarray on carbon cloth into a nickel-borate-phosphate nanoarray(Ni-Bi-Pi/CC)by oxidative polarization in potassium borate water.When used as a 3D water oxidation catalyst,such Ni-Bi-Pi/CC shows high activity with a geometrical catalytic current density of 10 mA cm^(-2) at an overpotential of only 440 mV in 0.1 M K-Bi,rivaling the performances of the reported Ni-containing catalysts operated under benign conditions.Notably,this electrode also demonstrates strong long-term electrochemical durability with 100% Faradaic efficiency for oxygen evolution.All these features promise its use as an attractive low-cost catalyst electrode in water-splitting devices for mass production of hydrogen fuels under environmentally friendly conditions.展开更多
基金supported by the National Natural Science Foundation of China(no.21575137 and 21375076)the Key Technologies Research and Development Program of Sichuan Province(2017GZ0419).
文摘The development of earth-abundant electrocatalysts for efficient water oxidation under moderate conditions is highly desired but still a big challenge.In this communication,we demonstrate the topotactic conversion of a nickel phosphide nanoarray on carbon cloth into a nickel-borate-phosphate nanoarray(Ni-Bi-Pi/CC)by oxidative polarization in potassium borate water.When used as a 3D water oxidation catalyst,such Ni-Bi-Pi/CC shows high activity with a geometrical catalytic current density of 10 mA cm^(-2) at an overpotential of only 440 mV in 0.1 M K-Bi,rivaling the performances of the reported Ni-containing catalysts operated under benign conditions.Notably,this electrode also demonstrates strong long-term electrochemical durability with 100% Faradaic efficiency for oxygen evolution.All these features promise its use as an attractive low-cost catalyst electrode in water-splitting devices for mass production of hydrogen fuels under environmentally friendly conditions.
