To Dung T, Park Sun Hwa, Kim Min Joong, Cho Hyun-Seok, Myung Nosang V
Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, United States.
Smart Devices Team, Korea Research Institute of Standards and Science, Deajeon, South Korea.
Front Chem. 2022 Sep 8;10:1010325. doi: 10.3389/fchem.2022.1010325. eCollection 2022.
The induced co-electrodeposition of Ni and Mo is a complex process, where metallic Ni-Mo alloys and Ni-Mo-O composites can originate from the complete and partial reduction of Mo respectively. By adjusting electrolyte compositions and electrodeposition parameters, various metallic, metal/oxide composite, and oxide thin films of Ni-Mo and Ni-Mo-O were electrodeposited from ammonium citrate baths. Ni-ammonia complexes, which play a critical role in promoting the deposition of metallic Ni-Mo alloys, were enhanced at alkaline pH ( 8-10) and lower temperature (, 25-45°C). Moreover, the electrochemical reduction of Ni is under mass transfer limitation, so the deposited Mo content decreased with increasing agitation. On the other hand, higher Mo content can be achieved by relatively higher citrate concentration and larger Mo-to-Ni precursor molar ratio. However, a critical molar ratio of metal precursor resulted in transition from alloy to composite due to Ni inducing the reduction of Mo.
镍和钼的诱导共电沉积是一个复杂的过程，在此过程中，金属镍钼合金和镍钼氧化物复合材料可分别源自钼的完全还原和部分还原。通过调整电解质成分和电沉积参数，从柠檬酸铵镀液中电沉积出了各种金属、金属/氧化物复合材料以及镍钼和镍钼氧化物的氧化物薄膜。在碱性pH值（8 - 10）和较低温度（25 - 45°C）下，对促进金属镍钼合金沉积起关键作用的镍氨络合物会增加。此外，镍的电化学还原受传质限制，因此随着搅拌的增加，沉积的钼含量会降低。另一方面，通过相对较高的柠檬酸盐浓度和较大的钼与镍前驱体摩尔比可实现更高的钼含量。然而，由于镍诱导钼的还原，金属前驱体的临界摩尔比会导致从合金向复合材料的转变。
