Electrochemical Reactivity Investigation of Urea Oxidation Reaction in Nichrome/Nitrogen Doped Carbon Nanofibers Synthesized by CVD Method

Todankar, Bhagyashri; Yaakob, Yazid; Kalita, Golap; Tanemura, Masaki

doi:10.1002/slct.202201386

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…Some reports in the literature have demonstrated the electrocatalytic activity of Ni- and Cr-incorporated N-doped CNFs grown on Nichrome foil substrate for the electrochemical detection of urea and trifunctional ORR, OER, and HER activities. , Nanoparticles of Ni and Cr were introduced into both the trunks and tips of CNFs, resulting in a notable improvement in their electrocatalytic activities. It is worth noting that the investigation presented here involves the utilization of thin layers of Ni on Cr and Ti adhesion layers, deposited on a silicon substrate, for the purpose of growing vertically oriented CNFs .…”

Section: Discussionmentioning

confidence: 99%

Ni Drastically Modifies the Microstructure and Electrochemistry of Thin Ti and Cr Layers

Kousar,

Quliyeva,

Pande

et al. 2024

J. Phys. Chem. C

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There is a significant lack of literature addressing changes in the microstructure of different interfacial metal layer combinations employed in fabricating electrochemical sensors based on carbon nanomaterials. This research gap extends to analyzing their influence on the electrochemical performance, which, in turn, impacts the understanding of the properties of materials incorporating these layers. In this study, microstructural variations and electrochemical activity of chromium and titanium adhesion layers, in combination with nickel catalyst layers (designated as TiNi and CrNi), on silicon wafers were analyzed post annealing. Interestingly, during a brief annealing period of 5 min, TiNi developed a surface layer comprising graphitic carbon, alongside the formation of TiO 2 , TiC, and NiSi, and exhibited electrochemical activity toward both dopamine (DA) and ascorbic acid (AA). Conversely, CrNi annealed for 5 min did not show the presence of such a carbon layer and displayed no discernible electrochemical activity toward the target molecules. Only after an extended annealing time of 20 min, signs of a carbon layer appear on CrNi, displaying a moderate electrochemical activity toward DA and AA. The formation of a carbon layer on CrNi is delayed due to the presence of Ni near the surface, which disrupts the local equilibrium. Consequently, the formation of the Cr 2 O 3 barrier layer is delayed, which in turn permits carbon diffusion into the underlying Cr layer. Conversely, Ni stabilizes the β-Ti form and markedly decreases the solubility of carbon and oxygen within the TiNi system. By providing a comprehensive analysis of microstructural changes and their impact on the surface chemistry and electrochemical responses of commonly used interfacial metal layers, this paper offers invaluable insights in selecting suitable adhesion and catalyst layer combinations for carbon nanomaterial fabrication.

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Section: Discussionmentioning

confidence: 99%

Ni Drastically Modifies the Microstructure and Electrochemistry of Thin Ti and Cr Layers

Kousar,

Quliyeva,

Pande

et al. 2024

J. Phys. Chem. C

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“…Furthermore, it is more electrically conductive than carbon black and less expensive than CNTs. On the basis of these advantages, CNFs have been researched in electrochemical water splitting, − fuel cells, ,, and urea oxidation reactions (UORs). − …”

Section: Introductionmentioning

confidence: 99%

Heat Treatment for Enhancing Ir-Based Catalysts Enclosed in a Carbon Layer for Electrochemical Oxygen Evolution Reaction

Huynh,

Choi,

Lee

et al. 2023

ACS Sustainable Chem. Eng.

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Electrochemical water splitting is one of the environmentally friendly methods to produce H2 gas. However, the low cost-competitiveness of water electrolysis compared to other methods, including H2 production from natural gas, is a main hurdle for its commercial use. Therefore, continuous efforts need to be put into water electrolysis systems for improving their energy efficiency, and the development of more active and durable electrocatalysts is one of the critical requirements. This study introduces a simple synthetic procedure of iridium oxide (IrO x ) nanoparticles covered by thin carbon shells and the methods to modulate the oxidation states of IrO x and the thickness of carbon shells. The postheat treatment results in the transformation of metallic Ir to Ir4+ in IrO x and oxidative thinning of carbon shells. The synthesized IrO x catalysts are investigated for the electrochemical oxygen evolution reaction (OER). This study covers how the oxidation states of IrO x nanoparticles and carbon shells affect the performance and durability of the OER. Under the optimal conditions of both variables, a current density of 1 A·cm–2 is obtained at a cell voltage of 1.62 V from a single cell of proton exchange membrane water electrolysis (PEMWE).

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Electrochemical Reactivity Investigation of Urea Oxidation Reaction in Nichrome/Nitrogen Doped Carbon Nanofibers Synthesized by CVD Method

Cited by 2 publications

References 42 publications

Ni Drastically Modifies the Microstructure and Electrochemistry of Thin Ti and Cr Layers

Ni Drastically Modifies the Microstructure and Electrochemistry of Thin Ti and Cr Layers

Heat Treatment for Enhancing Ir-Based Catalysts Enclosed in a Carbon Layer for Electrochemical Oxygen Evolution Reaction

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