Highly efficient electrocatalytic water splitting by MXene supported CoP nanorods
Transition metal phosphide(TMP)shows great potential in catalyzing electrochemical water splitting for hydrogen(H2)production.By combining the exceptional electrical conductivity of MXene and the high catalytic activity of TMP,this study aims to enhance the overall performance towards water electrolysis.Specifically,cobalt phosphide nanorods supported by MXene(CoP NRs/Ti2C)were synthesized through a three-step procedure involving molten salt etching,hydrothermal treatment,and in-situ phosphidation.Under alkaline conditions(1mol/L KOH),CoP NRs/Ti2C required significantly reduced overpotentials for both the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)to maintain a current density of 10mA/cm2,with values of 105mV and 320mV,respectively.In comparison,CoP NRs required higher overpotentials(157mV for HER and 350mV for OER).Furthermore,CoP NRs/Ti2C demonstrated more favorable reaction kinetics,by lower Tafel slopes(63.4mV/dec for HER and 54.6mV/dec for OER)when compared to CoP NRs(79.6mV/dec for HER and 60.8mV/dec for OER).In a two-electrode configuration employing CoP NRs/Ti2C,a remarkably low external voltage of only 1.62V was sufficient to achieve 10mA/cm2.Collectively,these findings verified the substantial enhancement in electrocatalytic performance facilitated by the Ti2C support for CoP NRs.Consequently,this study put forth a viable strategy for further improving the catalytic capabilities of TMP,with the potential to supplant noble metal catalysts in hydrogen generation applications.
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