Effects of Ce Doping on the Photocatalytic and Electrochemical Performance of Nickel Hydroxide Nanostructures

Martínez‐Sánchez, Carolina; Regmi, Chhabilal; Lee, S. W.; Rodríguez-González, Vicente

doi:10.1007/s11244-020-01295-y

Cited by 12 publications

(5 citation statements)

References 58 publications

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“…Deposition of metallic Ni provoked decreased light absorbance and a slight red shift of O → Ce 3+ charge transfer band with both catalysts related to the BCY15 spectra, which is indication for interaction between Ni 0 and Ce 3+ sites as established by XPS and EPR [31]. Bands in the range 290-370 nm are ascribed to ligand-to-metal charge transfer of O 2− to Ni 2+ in Ni(OH) 2 [42,43]. The presence of Ni 2+ ions on the surface was also registered by XPS analysis of as-synthesized reduced Ni/BCY-W and Ni-BCY-EG cermets.…”

Section: Surface Electronic State Analysismentioning

confidence: 78%

Environmentally Benign pSOFC for Emissions-Free Energy: Assessment of Nickel Network Resistance in Anodic Ni/BCY15 Nanocatalyst

et al. 2023

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Yttrium-doped barium cerate (BCY15) was used as ceramic matrix to obtain Ni/BCY15 anode cermet for application in proton-conducting solid oxide fuel cells (pSOFC). Ni/BCY15 cermets were prepared in two different types of medium, namely deionized water (W) and anhydrous ethylene glycol (EG) using wet chemical synthesis by hydrazine. An in-depth analysis of anodic nickel catalyst was made aiming to elucidate the effect of anode tablets’ preparation by high temperature treatment on the resistance of metallic Ni in Ni/BCY15-W and Ni/BCY15-EG anode catalysts. On purpose reoxidation upon high-temperature treatment (1100 °C for 1 h) in air ambience was accomplished. Detailed characterization of reoxidized Ni/BCY15-W-1100 and Ni/BCY15-EG-1100 anode catalysts by means of surface and bulk analysis was performed. XPS, HRTEM, TPR, and impedance spectroscopy measurements experimentally confirmed the presence of residual metallic Ni in the anode catalyst prepared in ethylene glycol medium. These findings were evidence of strong metal Ni network resistance to oxidation in anodic Ni/BCY15-EG. Enhanced resistance of the metal Ni phase contributed to a new microstructure of the Ni/BCY15-EG-1100 anode cermet getting more stable to changes that cause degradation during operation.

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Section: Surface Electronic State Analysismentioning

confidence: 78%

Environmentally Benign pSOFC for Emissions-Free Energy: Assessment of Nickel Network Resistance in Anodic Ni/BCY15 Nanocatalyst

et al. 2023

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“…A series of Ni‐based particle was formed due to the reaction of Ni + with the oxygen functionalities of the GO. Among them, most intense peak around 370 nm was corresponding to the d – d transitions of the Ni in Ni(OH) 2 [38] The reduction of GO was confirmed due to the appearance of the absorption peak at 272 nm [39,40] . As the reduced GO (rGO) was covered by Ni‐particles, absorbance intensity was low.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Coupling of Graphene with Nickel Nanoparticles for Water Splitting and Urea Oxidation: A Spectroelectrochemical Investigation

Saha

Das

2023

ChemPhysChem

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Nickel nanoparticle and graphene interfaces of various stoichiometries were created through electrodeposition techniques. The catalytic behavior of the electrodeposited films was investigated through spectro‐electrochemical methodologies. UV‐vis absorbance spectra of the electrodeposited films are significantly different in the air and alkaline medium. Furthermore, UV‐vis and Raman spectroscopy confirmed the coupling of Ni nanoparticles (Ni‐NP) with the graphene framework, along with NiO and Ni(OH)2. A combination of Raman and impedance spectroscopy revealed that the surface adsorption and charge transfer properties of the electrodeposited films are entirely dependent on the defects on graphene structure as well as distribution of Ni‐NP on graphene. The electrodeposited films possess heterogeneous catalytic properties with a low overpotential of 50 mV (10 mA/cm‐2) for hydrogen evolution reaction, as well as 601 mV and 391 mV (at 50 mA/cm‐2) for the oxygen evolution reaction and urea oxidation reaction, respectively. In addition, eelectrodeposited samples show extraordinary overall water splitting performance by achieving a current density of 10 mA/cm2 at a very small applied potential of 1.38 V. This synergistic coupling of Ni and graphene renders the electrodeposited samples promising candidates as electrodes for overall water splitting in alkaline and urea‐supplemented solutions.

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“…Electrodecoration with Ni(OH) 2 resulted in an R ct value of 12.5 Ω. This indicates that the electrodeposition of nickel hydroxide facilitated the charge transfer kinetics at the electrode, leading to the conclusion that the modification of the electrode with the use of the hybrid material PCA@MWCNT-Ni(OH) 2 enabled the achievement of electrochemical properties that make it suitable for electrocatalytic applications [22,23].…”

Section: Electrochemical Characterizationmentioning

confidence: 93%

“…A bare GC electrode (a) and electrodes modified with PCA@MWCNT (b) and PCA@MWCNT-Ni(OH) 2 (c) were tested. For all materials, two areas changed depending on the frequency range; a small semicircle was seen in each high-frequency region and a line in each low-frequency region [23]. The experimental data were modeled using an equivalent Randles circuit (R ct ), presented in the inset of Figure 4B.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

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Facile Fabrication of a Selective Poly(caffeic acid)@MWCNT-Ni(OH)2 Hybrid Nanomaterial and Its Application as a Non-Enzymatic Glucose Sensor

et al. 2023

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A novel catechol-based PCA@MWCNT-Ni(OH)2 hybrid material was prepared and used to construct a non-enzymatic glucose biosensor. In this synthesis, MWCNTs were covered with a poly(caffeic acid) coating and then subjected to a straightforward electrochemical process to decorate the hybrid material with Ni(OH)2 particles. The physicochemical properties and morphology of the nanomaterial were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM). Amperometry and cyclic voltammetric studies demonstrated the enhanced redox properties of a GC/PCA@MWCNT-Ni(OH)2 electrode and its electrocatalytic activity in glucose detection, with a low detection limit (0.29 μM), a selectivity of 232.7 μA mM−1 cm−2, and a linear range of 0.05–10 mM, with good stability (5 months) and reproducibility (n = 8). The non-enzymatic sensor was also used for glucose determination in human serum and human blood, with recovery values ranging from 93.3% to 98.2%. In view of the properties demonstrated, the described GC/PCA@MWCNT-Ni(OH)2 sensor represents a facile synthesis method of obtaining the hybrid nanomaterial and a low-cost approach to electrochemical glucose measurement in real samples (human serum, human blood).

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Effects of Ce Doping on the Photocatalytic and Electrochemical Performance of Nickel Hydroxide Nanostructures

Cited by 12 publications

References 58 publications

Environmentally Benign pSOFC for Emissions-Free Energy: Assessment of Nickel Network Resistance in Anodic Ni/BCY15 Nanocatalyst

Environmentally Benign pSOFC for Emissions-Free Energy: Assessment of Nickel Network Resistance in Anodic Ni/BCY15 Nanocatalyst

Interfacial Coupling of Graphene with Nickel Nanoparticles for Water Splitting and Urea Oxidation: A Spectroelectrochemical Investigation

Facile Fabrication of a Selective Poly(caffeic acid)@MWCNT-Ni(OH)2 Hybrid Nanomaterial and Its Application as a Non-Enzymatic Glucose Sensor

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