Electrochemical Deposition Tailors the Catalytic Performance of MnO2-Based Micromotors
Electrochemical Deposition Tailors the Catalytic Performance of MnO2-Based Micromotors
复制标题
电化学沉积调整 MnO2 基微电机的催化性能
DOI：
10.1002/smll.201802771
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发表时间：
2018-11-08
期刊：
影响因子：
13.3
通讯作者：
Wang, Joseph
中科院分区：
文献类型：
--
作者：
Liu, Wenjuan;Ge, Hongbin;Wang, Joseph
人工微/纳米马达可以在微/纳米尺度上自主地执行各种任务，在许多实际应用中已经成为有前途的工具。电化学合成是制备这些具有不同几何形状和材料组分的微/纳米器件的主要方法之一。通过改变电化学沉积的条件，可以调整沉积材料的表面形态、晶体结构，从而调整所得的性能。在目前的工作中，提出了一种可行的制造策略，在三个独特的电沉积类型（即，动电位、恒电位（PS）和恒电流）来合成不同的基于MnO 2的微电机。由于三种MnO 2基微电机的化学组成和形貌设计不同，其推进性能以及对以亚甲基蓝为代表的偶氮染料有机废水的催化降解性能也不同。在PS模式下，激活的R-MnO 2基微电机具有快速运动速度（高达每秒12个体长），从而实现最高的降解效率。这样的推进性能可与铂、银等贵金属制成的微火箭相媲美。新协议将对合成微/纳米马达的设计产生深远的影响，并为它们的各种应用带来相当大的希望。
Artificial micro/nanomotors that could perform diverse tasks autonomously at the micro/nanoscale have been emerging as promising tools in many practical applications. Electrochemical synthesis is one of the dominating methods to fabricate these micro/nanodevices with diverse geometries and material components. By changing the conditions of electrochemical deposition, the surface morphology, crystal structure, and hence the resultant performance of deposited material could be tailored. In the current work, a feasible fabrication strategy is presented in terms of three unique electrodeposition types (i.e., potentiodynamic, potentiostatic (PS), and galvanostatic) to synthesize different MnO2-based micromotors. Distinct propulsion behavior as well as the catalytic degradation of azo-dye organic waste (with methylene blue as the representative), between three kinds of MnO2-based micromotors is clearly displayed, owing to the distinctive chemical composition and morphology designs. The activated R-MnO2-based micromotors in PS mode exhibit fast motion speed (up to 12 body length per second), leading to the highest degradation efficiency. Such propulsion performance is comparable with the microrockets made by noble metals such as Pt and Ag. The new protocol will have a profound impact on the design of synthetic micro/nanomotors and hold a considerable promise for their diverse applications.