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使用纳米材料作为电化学沉积的基础材料:迷你回顾
Electrochemistry Communications
(
IF
4.7
)
Pub Date : 2020-09-10
, DOI:
10.1016/j.elecom.2020.106830
Liang Liu
,
Daniel Mandler
电化学沉积(ED)可以追溯到法拉第,是一种成熟的生产涂层的方法。这篇综述总结了非常规的ED方法,其中沉积了纳米结构的薄膜,从纳米材料开始,而不是分子或离子种类开始。这种“从纳米到纳米”的沉积概念具有显着的优势,可以将纳米物体直接从分散体转移到涂层中,从而保持其独特的纳米结构。通过以下方式实现通过施加电化学势或电流来破坏分散体中的纳米物体的稳定性,这通过两种不同的机制减少了颗粒间的排斥:(a)直接氧化还原诱导的沉积;(b)间接pH和离子强度引起的沉积。利用电化学反应作为驱动力,沉积过程对导电和电化学活性基材具有选择性,并且可以通过电势/电流和时间进行控制,从而产生厚度从纳米到几微米的薄膜。值得注意的是,也可以使用间接机理经由“纳米到纳米”方法电化学沉积电化学惰性和甚至不导电的纳米材料。还讨论了挑战和前景。
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Using nanomaterials as building blocks for electrochemical deposition: A mini review
Electrochemical deposition (ED) dates back to Faraday and is a well-established approach for producing coatings. This review summarizes unconventional ED approaches, where nanostructured films are deposited, starting with nanomaterials as building blocks, instead of molecular or ionic species. This “nano to nano” deposition concept has a significant advantage of directly transferring nano-objects from the dispersion to the coating, which maintains their unique nanostructures. It is achieved via destabilizing the nano-objects in the dispersions by applying electrochemical potential or current, which diminishes the interparticle repulsion through two different mechanisms: (a) Direct redox induced deposition; (b) Indirect pH and ionic strength induced deposition. With electrochemical reactions as a driving force, the deposition process is selective to conductive and electrochemically active substrates and can be manipulated by potential/current and time, yielding films with thickness from nanometers to a few microns. Notably, electrochemically inactive and even non-conductive nanomaterials may also be electrochemically deposited via the “nano to nano” approach using an indirect mechanism. Challenges and prospects are also discussed.
更新日期:2020-09-23