One-step deposition of Ni Cu1− alloys with both composition gradient and morphology evolution by bipolar electrochemistry

Xu, Fei; Wang, Han; He, Xiao-Di; Deng, Ning; Li, Fang; Li, Bing; Xie, Junwei; Han, Shi‐Kui; He, Jianbo

doi:10.1016/j.jelechem.2018.06.003

Cited by 17 publications

(9 citation statements)

References 40 publications

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“…In this case, three distinct areas can be identified, one containing mostly S, another one with CdS, and the last part with a mixture of CdS and Cd, which can be identified by Raman and Auger electron spectroscopy (62). With the same philosophy, a Ni-Cu alloy gradient has been prepared in one step by BPE (Figure 2e) (63,64), and it is even possible to co-electrodeposit up to three metals, Cu, Ni, and Zn on the cathodic side of a BE with a ratio that varies along the BE. The order in which the species are deposited corresponds to the respective standard potentials.…”

Section: Direct Bpe Electrodepositionmentioning

confidence: 99%

Bipolar Electrochemistry

Bouffier¹,

Zigah

Šojić

et al. 2021

Encyclopedia of Electrochemistry

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Bipolar electrochemistry is a technique that involves two opposite chemical processes, namely an oxidation and a reduction, occurring simultaneously on the surface of a conducting object, usually without connection to a power supply. The basic phenomenon has already been described and used for many decades but regained a lot of interest in recent years, thanks to several attractive features for developing new applications in various areas ranging from materials science and analytical chemistry to catalysis and even life science. Consequently, bipolar electrochemistry has experienced a substantial growth in the number of users and publications. This is mostly due to several advantages over classic electrochemistry, such as the absence of an ohmic contact, the generation of a directional gradient of electroactivity on the object, and the possibility to address simultaneously thousands of objects, which opens the door for high throughput screening of (electro)chemical properties. Also, some features of this "wireless" electrochemistry allow performing experiments that cannot be achieved with a classic electrochemical setup. Last but not least, only rather low-cost equipment is needed. The objective of the present contribution is to introduce first some fundamental aspects of bipolar electrochemistry, and then to illustrate its different developments, highlighting not only the historic landmark achievements, but also the most recent findings, especially in the context of micro-and nanoscience. The chapter will illustrate the singularities and advantages of this straightforward approach and hopefully convince the reader of the power of this interesting electrochemical concept.

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Section: Direct Bpe Electrodepositionmentioning

confidence: 99%

Bipolar Electrochemistry

Bouffier¹,

Zigah

Šojić

et al. 2021

Encyclopedia of Electrochemistry

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“…17 Besides these approaches, electrochemical methods have been widely used because of its low cost, reliability and ease of adaptation for the production of a large variety of materials. Particularly, bipolar electrochemistry is a promising technique for the generation of metal composition gradients with electrocatalytic activity and optical and electronic properties, [18][19][20] gradient polymer surfaces for electrochemical patterning applications 21 and surface-wetting gradients with controlled hydrophilic behavior. 22 Although a variety of methods such as magnetron plasma aggregation, spin coating, and centrifugation have been developed to produce nanoparticle size gradients, [23][24][25] electrochemical methods have been proved to be very reliable for synthesizing nanoparticle size gradients [26][27][28] and concentration gradient nanowire (NW) arrays.…”

Section: Introductionmentioning

confidence: 99%

Control of the asymmetric growth of nanowire arrays with gradient profiles

2021

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“…Bipolar electrochemistry has attracted significant attention as a platform to study fundamental aspects of electron transfer, electrodeposition, and chemical sensing . In a bipolar electrochemical circuit, the working electrode is subjected to an externally applied voltage that generates a gradient of interfacial potential along one direction of the working electrode, providing a ‘snapshot’ of the system's voltammetric behavior that can be monitored using a variety of spectroscopic techniques .…”

Section: Introductionmentioning

confidence: 99%

Reduction of 4‐Nitrothiophenol on Ag/Au Bimetallic Alloy Surfaces Studied Using Bipolar Raman Spectroelectrochemistry

Wang

Shannon

2020

ChemElectroChem

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Herein, we describe an experimental approach for adapting the principles of Raman spectroelectrochemistry to electrodes controlled using a bipolar circuit. This method allows the simultaneous acquisition of spectroscopic data as a function of both the electrode potential and the chemical composition of a bimetallic alloy and can be generalized to other system variables. The electrochemical reduction of 4-nitrothiophenol (4-NTP) was carried out on bimetallic Ag/Au alloy gradients and monitored in situ using a confocal Raman microscope with 785 nm excitation. Continuous Ag/Au alloy gradients, in which the alloy composition varied from approximately 0.5 to 1.0 mole fraction Ag, were prepared by using bipolar electrodeposition and then modified with a monolayer of 4-NTP using self-assembly. 4-NTP monolayers on Au/Ag alloys were placed in a bipolar electrochemical cell and characterized as a function of applied potential and chemical composition by using surface-enhanced Raman scattering. The E 1/2 for NTP reduction was observed to be a strong function of the alloy composition, increasing by over 100 mV as the mole fraction of Ag varied from 0.5 to 1.0. In addition, spectroscopic evidence for the formation of the partially reduced intermediate, 4,4'-dimercaptoazobenzene (DMAB) at intermediate applied potentials, was also found. Bipolar Raman spectroelectrochemistry (BRSE) is a powerful tool for acquiring in situ multidimensional Raman spectroelectrochemical data.

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One-step deposition of Ni Cu1− alloys with both composition gradient and morphology evolution by bipolar electrochemistry

Cited by 17 publications

References 40 publications

Bipolar Electrochemistry

Bipolar Electrochemistry

Control of the asymmetric growth of nanowire arrays with gradient profiles

Reduction of 4‐Nitrothiophenol on Ag/Au Bimetallic Alloy Surfaces Studied Using Bipolar Raman Spectroelectrochemistry

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