Abstract
Extrinsic heteroatom doping is an effective approach to enhance the electrochemical performance of electrocatalysts by the creation of new active sites, improved conductivity and optimization of adsorption/desorption energies. In this study, a W-doped NiBP electrocatalyst is designed by using hydrothermal synthesis and soaking doping approach for overall water splitting application. The W-doped NiBP spheres exhibit the overpotentials of 260 and 380 mV at 500 mA/cm2 in 1 M KOH for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) respectively. The bifunctional W-doped NiBP electrode demonstrates superior 2-E water splitting efficiency, requiring a low cell voltage of only 2.66 V at the high current density (HCD) of 2000 mA/cm2, significantly surpassing the benchmark Pt/C||RuO2 system. Additionally, it exhibits good stability with the continuous 120 h of water splitting operation without noticeable degradation. A hybrid Pt/C||W-doped NiBP demonstrates a further reduced voltage of 2.54 V at 2000 mA/cm2.The substantial performance enhancement can be attributed to the increased active sites, enhanced conductivity and optimized adsorption/desorption energies of intermediates through tungsten heteroatom doping.
Published Version
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