Vanadium carbide modified nickel-based catalyst for urea electrooxidation
Urea electrolysis has attracted wide attention for its energy-saving and environmentally friendly prospects in the fields of urea-containing wastewater treatment and hydrogen production.The key issue is the design of efficient and stable catalysts for urea electrooxidation.The synthesis of VC(vanadium carbide)modified nickel-based catalysts supported on multi-walled carbon nanotubes(Ni-VC/MWCNTs)for UOR(urea electrooxidation reaction)was reported.Ni-VC/MWCNTs has a superior current density of 343.3 mA/mg.Particularly,Ni-VC/MWCNTs has a smaller Tafel slope and a lower charge transfer resistance compared with Ni/MWCNTs.Moreover,the current density under the steady state of Ni-VC/MWCNTs is also enhanced.XPS(X-ray photoemission spectroscopy)demonstrates that the introduction of VC makes Ni more susceptible to lose electrons to form the active component NiOOH,which improves the UOR performance.Furthermore,in the urea electrolytic cell,the voltage required to supply 10 mA/cm2 with Ni-VC/MWCNTs as the anode is reduced by nearly 100 mV compared with Ni/MWCNTs.The result suggests Ni-VC/MWCNTs is an efficient catalyst for urea electrolysis,which is expected to high-efficiency hydrogen production and resourceful utilisation of wastewater.
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