Trace Cobalt Doping and Defect Engineering of High Surface Area α-Ni(OH)2 for Electrocatalytic Urea Oxidation

Yi Liu, Zhihui Yang, Yuqin Zou, Shuangyin Wang, Junying He

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Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (2) : 12576. DOI: 10.1002/eem2.12576
RESEARCH ARTICLE

Trace Cobalt Doping and Defect Engineering of High Surface Area α-Ni(OH)2 for Electrocatalytic Urea Oxidation

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Abstract

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.

Keywords

defect engineering / electrocatalysis / small molecule oxidation

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Yi Liu, Zhihui Yang, Yuqin Zou, Shuangyin Wang, Junying He. Trace Cobalt Doping and Defect Engineering of High Surface Area α-Ni(OH)2 for Electrocatalytic Urea Oxidation. Energy & Environmental Materials, 2024, 7(2): 12576 https://doi.org/10.1002/eem2.12576

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