Oxygen vacancies engineering by coordinating oxygen-buffering CeO2 with CoO nanorods as efficient bifunctional oxygen electrode electrocatalyst

Zhong, Haihong; Estudillo‐Wong, Luis Alberto; Gao, Yuan; Feng, Yongjun; Alonso-Vante, Nicolás

doi:10.1016/j.jechem.2020.11.033

Cited by 63 publications

(32 citation statements)

References 79 publications

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“…Therefore, researchers focus on increasing the active sites by either doping foreign elements (Fe-doped NiO coupled with Ni clusters), creating heterostructures to enhance electron transfer (NiO/NiCo 2 O 4 ), or designing various morphologies (nanosheets or nanoflakes) that provide more active sites . On the other hand, recently, the electrochemical activity of the most abundant lanthanum oxide, that is, CeO 2 , is being extensively studied in bifunctional OER/ORR catalysis due to its reversible shuttling between Ce 3+ and Ce 4+ states and intrinsic oxygen vacancy defects. − In the CeO 2 fluorite lattice, when an oxygen vacancy is created, one Ce 4+ is replaced by two Ce 3+ ions to balance the charge. Thus, CeO 2 can act as an oxygen buffer, which can supply or store oxygen in O 2 -deficient or O 2 -rich conditions, respectively .…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO₂ Nanosphere/NiO Nanoflake Nanocomposites

Ghosh

Kumar

Raj

et al. 2022

ACS Appl. Energy Mater.

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The design and development of bifunctional electrocatalysts that can catalyze both the oxygen evolution reaction and oxygen reduction reaction (OER/ORR) is a burning issue for energy conversion and storage technologies. Herein, we demonstrate the bifunctional activity of CeO2 nanospheres embedded in NiO nanoflakes. The CeO2/NiO nanocomposites are synthesized solvothermally by varying their molar ratios. Among the synthesized nanocomposites, CeO2/NiO-2 exhibits an outstanding OER/ORR activity compared to those of individual counterparts and other compositions and outperforms the benchmark ORR catalyst Pt/C and the OER catalyst IrO2 in terms of stability. The CeO2/NiO-2 nanocomposite shows the low onset potential of 1.47 and 0.8 V (vs reversible hydrogen electrode) for OER and ORR, respectively. Moreover, a low potential difference (i.e., ΔE) of 0.86 V between the potential for 10 mA cm–2 OER current density and the ORR half-wave potential for CeO2/NiO-2 makes it an efficient bifunctional oxygen electrocatalyst. The excellent bifunctional activity of the nanocomposite is ascribed to the electronic synergy between CeO2 and NiO, which leads to the formation of an increased number of oxygen vacancy defects as well as more accessible active sites at an optimum molar ratio of CeO2 and NiO. The unique morphology of CeO2 nanospheres embedded in NiO nanoflakes facilitates the exposure of surface-active sites with the bifunctional nature of the catalyst. The practical applicability of the CeO2/NiO-2 nanocomposite is demonstrated with a Zn–air battery, which delivers 1.41 V open-circuit voltage and 105.0 mW cm–2 peak power density. It has long-term cycling stability for 22 h with negligible voltaic efficiency loss.

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Section: Introductionmentioning

confidence: 99%

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO₂ Nanosphere/NiO Nanoflake Nanocomposites

Ghosh

Kumar

Raj

et al. 2022

ACS Appl. Energy Mater.

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“…Compared with that before the reaction, the peaks of Co 2p spectrum for Co(CO 3 ) 0.5 OH@CC negatively shift, which suggested that Co 2+ had a tendency to transform like Co 3+ during the OER process. The Co 3+ species may be assigned to the Co species in CoOOH, suggesting CoOOH may serve as active site for the OER (Zhong et al, 2021). Furthermore, the morphology of Co(CO 3 ) 0.5 OH@CC is maintained well apart from the slight surface corrosion (Figures 5C,D).…”

Section: Resultsmentioning

confidence: 93%

Facile Synthesis of Carbon Cloth Supported Cobalt Carbonate Hydroxide Hydrate Nanoarrays for Highly Efficient Oxygen Evolution Reaction

Yan

2021

Front. Chem.

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Developing efficient and low-cost replacements for noble metals as electrocatalysts for the oxygen evolution reaction (OER) remain a great challenge. Herein, we report a needle-like cobalt carbonate hydroxide hydrate (Co(CO3)0.5OH·0.11H2O) nanoarrays, which in situ grown on the surface of carbon cloth through a facile one-step hydrothermal method. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations demonstrate that the Co(CO3)0.5OH nanoarrays with high porosity is composed of numerous one-dimensional (1D) nanoneedles. Owing to unique needle-like array structure and abundant exposed active sites, the Co(CO3)0.5OH@CC only requires 317 mV of overpotential to reach a current density of 10 mA cm−2, which is much lower than those of Co(OH)2@CC (378 mV), CoCO3@CC (465 mV) and RuO2@CC (380 mV). For the stability, there is no significant attenuation of current density after continuous operation 27 h. This work paves a facile way to the design and construction of electrocatalysts for the OER.

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“…Peaks at 780.5 eV and 795.4 eV correspond to Co 3+ , and two peaks at 782.2 eV and 797.6 eV correlate to Co 2+ . These Co species can be assigned as CoN x or Co oxide [50,51] . The presence of oxides is generally associated with oxygen vacancies.…”

Section: Resultsmentioning

confidence: 99%

Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn‐Air Batteries

Mahbub

Adios

et al. 2021

Chemistry An Asian Journal

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Design and synthesis of low‐cost and efficient bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in Zn‐air batteries are essential and challenging. We report a facile method to synthesize heterostructure carbon consisting of graphitic and amorphous carbon derived from the agricultural waste of red bean pods. The heterostructure carbon possesses a large surface area of 625.5 m2 g−1, showing ORR onset potential of 0.89 V vs. RHE and OER overpotential of 470 mV at 5 mA cm−2. Introducing hollow FeCo nanoparticles and nitrogen dopant improves the bifunctional catalytic activity of the carbon, delivering ORR onset potential of 0.93 V vs. RHE and OER overpotential of 360 mV. Electron energy‐loss spectroscopy (EELS) O K‐edge map suggests the presence of localized oxygen on the FeCo nanoparticles, suggesting the oxidation of the nanoparticles. Zn‐air battery with these carbon‐based catalysts exhibits a peak power density as high as 116.2 mW cm−2 and stable cycling performance over 210 discharge/charge cycles. This work contributes to the advancement of bifunctional oxygen electrocatalysts while converting agricultural waste into value‐added material.

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Oxygen vacancies engineering by coordinating oxygen-buffering CeO2 with CoO nanorods as efficient bifunctional oxygen electrode electrocatalyst

Cited by 63 publications

References 79 publications

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO₂ Nanosphere/NiO Nanoflake Nanocomposites

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO₂ Nanosphere/NiO Nanoflake Nanocomposites

Facile Synthesis of Carbon Cloth Supported Cobalt Carbonate Hydroxide Hydrate Nanoarrays for Highly Efficient Oxygen Evolution Reaction

Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn‐Air Batteries

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Oxygen vacancies engineering by coordinating oxygen-buffering CeO2 with CoO nanorods as efficient bifunctional oxygen electrode electrocatalyst

Cited by 63 publications

References 79 publications

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO2 Nanosphere/NiO Nanoflake Nanocomposites

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO2 Nanosphere/NiO Nanoflake Nanocomposites

Facile Synthesis of Carbon Cloth Supported Cobalt Carbonate Hydroxide Hydrate Nanoarrays for Highly Efficient Oxygen Evolution Reaction

Red Bean Pod Derived Heterostructure Carbon Decorated with Hollow Mixed Transition Metals as a Bifunctional Catalyst in Zn‐Air Batteries

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Bifunctional Catalytic Activity of Solvothermally Synthesized CeO₂ Nanosphere/NiO Nanoflake Nanocomposites

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO₂ Nanosphere/NiO Nanoflake Nanocomposites