Single-crystalline ultrathin nanofilms of Ni aerogel with Ni(OH)2 hybrid nanoparticles towards enhanced catalytic performance for ethanol electro-oxidation

Zhou, Xiao-Cao; Yang, Xinyu; Fu, Zhibing; Yang, Qi; Yang, Xi; Tang, Yongjian; Wang, Chaoyang; Yi, Yong

doi:10.1016/j.apsusc.2019.06.210

Cited by 27 publications

(11 citation statements)

References 48 publications

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“…7. The shape of the CVs is in agreement with nickel catalysts behavior reported in the same experimental condition of the current study [2,45]. The characteristic redox feature of nickel can be seen in CVs.…”

Section: Resultssupporting

confidence: 89%

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Coelho

Barbosa

Liu

et al. 2020

Mater Renew Sustain Energy

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Nickel nanoparticles supported by commercial carbon paper (CP) are prepared by pulsed laser deposition with deposition time of 3, 6, and 12 min as a catalyst for urea electro-oxidation. The surface conditions and the morphologies of the prepared electrodes have been characterized by Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Urea electro-oxidation reaction in KOH solution on the Ni/CP electrodes is investigated by cyclic voltammetry and chronoamperometry. The results show that the electrode with less Ni nanoparticle agglomeration shows higher peak current density, which was achieved in the 3 min deposition samples when normalized by electroactive surface areas. However, the highest current normalized by the area of the carbon paper was achieved in the 6 min deposition sample due to the larger quantity of Ni nanoparticles. All the samples show good stability. Our results suggest that the low density, low cost, and environmental friendly CP can be used as support for Ni nanoparticle as a catalyst for urea electro-oxidation. It thus has great potential for many applications involving urea oxidation, such as wastewater treatments.

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Section: Resultssupporting

confidence: 89%

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Coelho

Barbosa

Liu

et al. 2020

Mater Renew Sustain Energy

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“…They are positioned at 0.51 V in the direct scan and 0.37 V in the reverse scan, where the peak in the direct scan refers to the oxidation of Ni 2+ (Ni(OH) 2 ) to Ni 3+ (NiOOH), while the peak of the reverse scan corresponds to the reduction of Ni 3+ to Ni 2+ . 4, 24,30 For Ni/C-CeO 2 commercial and Ni/C-CeO 2 nanowire materials, the peaks in the direct scan were shifted to higher potential values, 0.53 and 0.54 V, respectively. While in the reverse scan, the peaks are shifted to lower potentials at 0.34 V and 0.33 V, for Ni/C-CeO 2 commercial and Ni/C-CeO 2 nanowire, respectively.…”

Section: Physical Characterizationmentioning

confidence: 98%

“…The XRD patterns of the Ni/C, Ni/C-CeO 2 commercial and Ni/C-CeO 2 nanowire electrocatalysts are shown in Figure 1. In the XRD diffractogram of Ni/C material, it is possible to observe the peaks related to Ni(OH) 2 located in 2ϴ = 33.5°; 38.6° and 59.7° attributed to the reflection plans {100}, {101} and {110}, 24 respectively. The peaks for Ni° are also found at 2ϴ = 44.7°; 52.0° and 76.6° corresponding to the crystalline planes {111}, {200} and {220}, 16 respectively.…”

Section: Physical Characterizationmentioning

confidence: 99%

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

Tanabe¹,

Barbosa²,

Checca³

et al. 2020

Rev. Virtual Quim.

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Resumo: A ureia, além de estar presente na urina humana, é produzida como fertilizante em indústrias. Dessa forma, grande quantidade desse composto é lançada diariamente em efluentes. A oxidação eletroquímica da ureia é um método promissor para remoção desse composto. Assim, neste trabalho, nanopartículas de Ni suportadas em carbono e CeO 2 com diferentes morfologias, foram sintetizadas com o intuito de estudar a influência da presença do CeO 2 no processo de eletro-oxidação de ureia. As análises de difração de raios-x (DRX) revelaram a presença das fases Ni° e Ni(OH) 2 e confirmaram a presença do CeO 2 e do carbono. As imagens de microscopia eletrônica de transmissão (MET) confirmaram nanofios de CeO 2 com diâmetros de 15 nm e nanopartículas de Ni com 2 nm de tamanho. A atividade catalítica dos materiais foi investigada por experimentos de voltametria cíclica (VC) e cronoamperometria (CA), nos quais foi mostrado que a presença de céria aumentou a atividade catalítica na reação de oxidação eletroquímica da ureia. Urea, in addition to being present in human urine, is produced as a fertilizer in industries. Thus, a large amount of this compound is discharged daily into effluents. The electrochemical oxidation of urea is a promising method for removing this compound. Thus, in this work, Ni nanoparticles supported on carbon and CeO 2 with different morphologies were synthesized in order to study the influence of CeO 2 in the urea electro-oxidation process. X-ray diffraction (XRD) analyzes revealed the presence of the Ni° and Ni(OH) 2 phases and confirmed the presence of CeO 2 and carbon. Transmission electron microscopy (TEM) images confirmed CeO 2 nanowires with diameter of 15 nm and Ni nanoparticles with 2 nm in size. The catalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments, in which it was shown that the presence of ceria increased the catalytic activity in the electrochemical oxidation of urea reaction.

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“…As it can be seen, there is a decrease in the BET specific surface area (S BET ) up on introducing the carbon xerogel between the LDHs layers, which is a confirmation with the development of mesoporous character as observed from the increase in their pore diameter. These hierarchical pore structures are considered to be beneficial in electrocatalytic applications due to minimizing the diffusion barriers [60]. Figure 5c,d shows the BJH pore size distribution for the as-prepared sample.…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

et al. 2021

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Layered double hydroxides (LDHs) have emerged as promising electrodes materials for the methanol oxidation reaction. Here, we report on the preparation of different LDHs with the hydrothermal process. The effect of the divalent cation (i.e., Ni, Co, and Zn) on the electrochemical performance of methanol oxidation was investigated. Moreover, nanocomposites of LDHs and carbon xerogels (CX) supported on nickel foam (NF) substrate were prepared to investigate the role of carbon xerogel. The results show that NiFe-LDH/CX/NF is an efficient electrocatalyst for methanol oxidation with a current density that reaches 400 mA·m−2 compared to 250 and 90 mA·cm−2 for NiFe-LDH/NF and NF, respectively. In addition, all LDH/CX/NF nanocomposites show excellent stability for methanol oxidation. A clear relationship is observed between the electrodes crystallite size and their activity to methanol oxidation. The smaller the crystallite size, the higher the current density delivered. Additionally, the presence of carbon xerogel in the nanocomposites offer 3D interconnected micro/mesopores, which facilitate both mass and electron transport.

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Single-crystalline ultrathin nanofilms of Ni aerogel with Ni(OH)2 hybrid nanoparticles towards enhanced catalytic performance for ethanol electro-oxidation

Cited by 27 publications

References 48 publications

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Nickel nanoparticles supported by commercial carbon paper as a catalyst for urea electro-oxidation

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

Design of Self-Supported Flexible Nanostars MFe-LDH@ Carbon Xerogel-Modified Electrode for Methanol Oxidation

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