首页|Trace Cobalt Doping and Defect Engineering of High Surface Area α-Ni(OH)2 for Electrocatalytic Urea Oxidation
Trace Cobalt Doping and Defect Engineering of High Surface Area α-Ni(OH)2 for Electrocatalytic Urea Oxidation
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Owing to the intrinsically sluggish kinetics of urea oxidation reaction(UOR)involving a six-electron transfer process,developing efficient UOR electrocatalyst is a great challenge remained to be overwhelmed.Herein,by taking advantage of 2-Methylimidazole,of which is a kind of alkali in water and owns strong coordination ability to Co2+in methanol,trace Co(1.0 mol％)addition was found to induce defect engineering on α-Ni(OH)2 in a dual-solvent system of water and methanol.Physical characterization results revealed that the synthesized electrocatalyst(WM-Ni0.99Co0.01(OH)2)was a kind of defective nanosheet with thickness around 5-6 nm,attributing to the synergistic effect of Co doping and defect engineering,its electron structure was finely altered,and its specific surface area was tremendously enlarged from 68 to 172.3 m2 g-1.With all these merits,its overpotential to drive 10 mA cm-2 was reduced by 110 mV.Besides,the interfacial behavior of UOR was also well deciphered by operando electrochemical impedance spectroscopy.
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