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本文制备了一种双金属IrNi修饰的花状NiCo_2O_4复合材料,并研究了其对于氧析出反应的电化学活性,结果显示其电化学活性明显提升.NiCo_2O_4和IrNi分别通过水热法和热分解法制备,再通过超声复合,使得双金属附着在复合氧化物表面.通过与纯NiCo_2O_4,IrNi以及IrNi/Co_3O_4相比较,所制备的IrNi/NiCo_2O_4对于氧析出反应的性能最为优异.在各个参数指标中,拥有最低的过电势210mV,在540mV的过电势下具有最高的电流密度.电子转移数和塔菲尔斜率分析表明该复合材料由于修饰上了双金属材料,极大地降低了极化,具有更高效的电子转移速率.此外本文还对电催化机理进行了研究,发现复合材料结合反应位点有效改善了反应速率决定步骤.其中,协同效应起着至关重要的作用,这一效应明显提高电子传输效率的同时提供了更多的活性位点.IrNi/NiCo_2O_4是一种出色的氧析出反应电催化剂.
In this paper, a bimodal IrNi-modified flower-like NiCo_2O_4 composite was prepared and its electrochemical activity for oxygen evolution reaction was studied. The results showed that the electrochemical activity of NiCo_2O_4 was obviously improved.NiCo_2O_4 and IrNi were respectively hydrothermally and hydrothermally decomposed Prepared by ultrasonic compounding so that the bimetallic adheres to the surface of the composite oxide.The prepared IrNi / NiCo 2 O 4 has the most excellent performance for the oxygen precipitation reaction compared with the pure NiCo 2 O 4, IrNi and IrNi / Co 3 O 4 .In each parameter index , With the lowest overpotential of 210 mV and the highest current density at 540 mV overpotential.The electron transfer numbers and Tafel slope analysis show that the composite has a significantly reduced polarization due to the bimetallic modification, Efficient electron transfer rate.In addition, the electrocatalytic mechanism was also studied and found that the combination of the reaction site and the composite material effectively improve the reaction rate determination step, in which the synergistic effect plays a crucial role, and this effect significantly improves the electron Transport efficiency while providing more active sites.IrNi / NiCo 2 O 4 is an excellent oxygen precipitation reaction electrocatalyst.