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Metal-organic framework-derived Ni@C and NiO@C as anode catalysts for urea fuel cells.

ABSTRACT: Highly porous self-assembled nanostructured Ni@C and NiO@C were synthesized via calcination of a Ni-based metal-organic framework. The morphology, structure, and composition of as synthesized Ni@C and NiO@C were characterized by SEM, FIB-SEM, TEM, and XRD. The electro-catalytic activity of the Ni@C and NiO@C catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the Ni@C had a higher residual carbon content and a higher specific surface area than NiO@C, thus exhibiting an enhanced electrochemical performance for urea oxidation. A direct urea fuel cell with Ni@C as an anode catalyst featured an excellent maximum power density of 13.8?mW?cm^-2 with 0.33?M urea solution in 1?M KOH as fuel and humidified air as oxidant at 50?°C, additionally showing excellent stability during continuous 20-h operation. Thus, this work showed that the highly porous carbon-supported Ni catalysts derived from Ni-based metal-organic framework can be used for urea oxidation and as an efficient anode material for urea fuel cells.

SUBMITTER: Tran TQN

PROVIDER: S-EPMC6959365 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Metal-organic framework-derived Ni@C and NiO@C as anode catalysts for urea fuel cells.

Tran Thao Quynh Ngan TQN Park Bang Ju BJ Yun Woo Hyun WH Duong Tien Nhac TN Yoon Hyon Hee HH

Scientific reports 20200114 1

Highly porous self-assembled nanostructured Ni@C and NiO@C were synthesized via calcination of a Ni-based metal-organic framework. The morphology, structure, and composition of as synthesized Ni@C and NiO@C were characterized by SEM, FIB-SEM, TEM, and XRD. The electro-catalytic activity of the Ni@C and NiO@C catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the Ni@C had a higher residual carbon content and a higher specific surface area than NiO@C, thu ...[more]

PMID: 31937844

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Project description:Metal-organic frameworks (MOFs) have been an excellent platform for carbon dioxide reduction reactions (CO2RR). In this work, the feasibility of electrochemical reduction of CO2 to obtain C2-deep value-added products was investigated by the preparation of Mg-containing MOF-74 samples combined with transition metal cations (Ni2+, Co2+ and Zn2+). The prepared MOFs were used as electrocatalysts in CO2RR. Chronoamperometric analysis coupled to ATR-FTIR spectroscopy was employed to characterize the CO2 reduction products and subsequently via 1H NMR. Although an isostructural crystalline structure was observed in all synthesized MOFs, the pore diameter distribution was significantly affected due to the Mg coordination along with each transition metal nuclei with the organic ligand to form the MOF-74. Our results showed that Mg-containing MOF-74 electrocatalysts combined with Ni, Co and Zn ions successfully reduced CO2 to C2-deep products, while the monometallic Mg-MOF-74 showed only CO2 mineralization. An ester acetate, isopropyl alcohol, and formic acid were produced by Mg/Ni-MOF-74; isopropyl alcohol was provided by Mg/Co-MOF-74, and ethanol was generated by Mg/Zn-MOF-74. We observed that the change of the transition cation was a key factor in the selectivity of the obtained products, while the degree of Mg ions effectively incorporated into the MOF structure tuned the porosity and the electrocatalytic activity. Among them, Mg/Zn-MFOF-74 showed the highest Mg content loaded after synthesis and thus the most favorable electrocatalytic behavior towards CO2 reduction. Highlights • CO2-derived C2-deep reduction products were obtained by Mg-containing MOF-74 bimetallic electrocatalysts.• Mg-containing MOF-74 bimetallic electrocatalysts reduced CO2 to ester acetate, isopropanol, formic acid, and ethanol.• Mg/Zn-MOF-74 displayed the highest current density at a lower onset potential in CO2-saturated electrolyte.• The pore network could be tuned by the effective Mg content on a MOF-74 bimetallic sample.• Mg/Zn-MOF-74 showed the highest Mg content among all bimetallic electrocatalysts after the synthesis.

Dataset Information

Metal-organic framework-derived Ni@C and NiO@C as anode catalysts for urea fuel cells.

Publications

Metal-organic framework-derived Ni@C and NiO@C as anode catalysts for urea fuel cells.

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