Spinel-type NiCo2O4 with abundant oxygen vacancies as a high-performance catalyst for the oxygen reduction reaction

Lim, Dongwook; Kong, Hyungseok; Lim, Chaewon; Kim, Namil; Shim, Sang Eun; Baeck, Sung‐Hyeon

doi:10.1016/j.ijhydene.2019.07.091

Cited by 68 publications

(22 citation statements)

References 40 publications

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“…Recently, considerable attention has been paid to spinel materials falling within the classification MCo 2 O 4 (where M = Mn, Ni, Fe, Zn, etc.) as catalysts for oxygen reduction because of its low cost, environmental benignity, good stability, and so on .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Anti-poisoning Spinel Mn–Co–C as Cathode Catalysts for Low-Temperature Anion Exchange Membrane Direct Ammonia Fuel Cells

Xiao

et al. 2021

ACS Appl. Mater. Interfaces

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Low-temperature anion exchange membrane direct ammonia fuel cells (AEM-DAFCs) have emerged as a potential power source for transportation applications with the recognition that liquid ammonia is a carbon-free hydrogen carrier and facilitates storage, refill, and distribution. However, ammonia crossover from the cell anode to cathode can decrease the fuel efficiency, drop the voltage, and poison the cathode catalysts. In this work, the Mn−Co spinel on three different carbon supports [BP2000, Vulcan XC-72R, and multiwalled carbon nanotubes (MWCNTs)] has been successfully synthesized and demonstrated a high oxygen reduction reaction (ORR) activity with good ammonia tolerance. The structure and composition of the obtained Mn−Co−C catalysts were characterized by high-angle annular dark-field scanning transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. All three catalysts exhibit superb ammonia tolerance, and Mn−Co−BP2000 demonstrates the highest ORR activity, even better than the commercial Pt−C in the presence of ammonia. When paired with the commercial PtIr−C anode, the Mn−Co−BP2000 cathode improved the peak power density of single cells from 100.1 mW cm −2 for the Pt−C cathode to 128.2 mW cm −2 under a 2 bar backpressure in both electrodes at 80 °C. All the results have manifested that Mn−Co−BP2000 is a good cathode catalyst for low-temperature AEM-DAFCs.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Anti-poisoning Spinel Mn–Co–C as Cathode Catalysts for Low-Temperature Anion Exchange Membrane Direct Ammonia Fuel Cells

Xiao

et al. 2021

ACS Appl. Mater. Interfaces

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“…The ORR activity is evaluated by onset potential (E onset ) and half-wave potential (E 1/2 ). As shown in Figure 6A, OMC and N-OMC exhibited limited activities at 1600 rpm, while Co-N-3DOM/mC displayed high ORR performance (E onset = 0.95 V, E 1/2 = 0.85 V), outperformed Co-N-OMC (E onset = 0.92 V, E 1/2 = 0.80 V) and many reported nonprecious catalysts, [50][51][52][53] as reviewed through the recent work (Table S3), even outperformed Pt/C (E onset = 0.95 V, E 1/2 = 0.83 V). The resulting Co-N-3DOM/mC presented a greater kinetic current density (J k ) at 0.8 V (11.44 mA/cm 2 ) and smaller Tafel slope (70.5 mV/dec) compared with that of 20 wt% Pt/C (J k of 5.98 mA/cm 2 and Tafel slope of 82.2 mV/dec, respectively) and other carbon-based catalysts ( Figure S3, Figure 6B), suggesting that Co-N-3DOM/mC possesses more efficient ORR kinetics process.…”

Section: Orr Testsmentioning

confidence: 99%

Co‐N‐doped hierarchically ordered macro/mesoporous carbon as bifunctional electrocatalyst toward oxygen reduction/evolution reactions

Meng

Chen

Cai

et al. 2020

Intl J of Energy Research

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Exploring progressed activity and stability, electrocatalyst toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), has been the most considerable factor in extensive commercialization of metal-air batteries and fuel cells. Herein, Co/N co-doped 3D hierarchical porous bifunctional oxygen electrocatalyst was synthesized using F127 as soft template and PMMA nanosphere as hard template to build hierarchically ordered macro/mesoporous porous nanostructure. The as-obtained macro/mesoporous CoN doped carbon endowing its 3D ordered hierarchical porosity and satisfactory surface area, leading to superior performance for ORR, OER, and rechargeable Zn-air battery. For ORR, the catalyst showed superior ORR activity with an attractive half-wave potential of 0.85 V (vs RHE), remarkable methanol tolerance, and robust long-term stability under alkaline electrolyte. For OER, the assynthetized electrocatalyst exhibited low overpotential of 1.67 V (vs RHE) under the current density of 10 mA/cm 2. Moreover, the Zn-air battery assembled from the hierarchical porous catalyst displayed a high peak power density of 146 mW/cm 2 .

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“…Fuel cell is known as an electrical machine that is able to convert the chemical potential energy to electrical energy [56]. The oxygen reduction reaction is among the vital reactions in fuel cell [57]. This is due to the fact that to enhance the performance of the fuel cell, the amount and rate of oxygen reduction reaction of cathodes in fuel cell are vital variables [56].…”

Section: Energy Storagementioning

confidence: 99%

Production and Applications of Biomass-Derived Graphene-Like Materials

Arifin

2020

Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications

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Spinel-type NiCo2O4 with abundant oxygen vacancies as a high-performance catalyst for the oxygen reduction reaction

Cited by 68 publications

References 40 publications

Synthesis of Anti-poisoning Spinel Mn–Co–C as Cathode Catalysts for Low-Temperature Anion Exchange Membrane Direct Ammonia Fuel Cells

Synthesis of Anti-poisoning Spinel Mn–Co–C as Cathode Catalysts for Low-Temperature Anion Exchange Membrane Direct Ammonia Fuel Cells

Co‐N‐doped hierarchically ordered macro/mesoporous carbon as bifunctional electrocatalyst toward oxygen reduction/evolution reactions

Production and Applications of Biomass-Derived Graphene-Like Materials

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