An active nanoporous Ni(Fe) OER electrocatalyst via selective dissolution of Cd in alkaline media

Kim, Jun‐Hyuk; Youn, Duck Hyun; Kawashima, Konosuke; Lin, Jie; Lim, Hyungseob; Mullins, C. Buddie

doi:10.1016/j.apcatb.2017.11.053

Cited by 118 publications

(44 citation statements)

References 57 publications

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“…Among recent publications, Fe, Co, Ni-based catalysts are well acknowledged as potential candidates for ORR/OERo wing to their environmentally benign nature and high catalytic activities. [6,7] In particular,m ulti-metallic catalysts such as FeCo, [8] NiCo, [9] FeNi [10] are considered superior to single-metallicc atalysts owing to the intrinsic polarity of the bonding between differentm etals, which may promote the catalytic activity. [11] However,p ure multi-metallic compounds may not satisfy the catalytic process because of their strong agglomeration.…”

Section: Introductionmentioning

confidence: 99%

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Yang

et al. 2020

Chemistry A European J

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The development of cost‐effective and durable oxygen electrocatalysts remains highly critical but challenging for energy conversion and storage devices. Herein, a novel FeNi alloy nanoparticle core encapsulated in carbon shells supported on a N‐enriched graphene‐like carbon matrix (denoted as FeNi@C/NG) was constructed by facile pyrolyzing the mixture of metal salts, glucose, and dicyandiamide. The in situ pyrolysis of dicyandiamide in the presence of glucose plays a significant effect on the fabrication of the porous FeNi@C/NG with a high content of doped N and large specific surface area. The optimized FeNi@C/NG catalyst displays not only a superior catalytic performance for the oxygen reduction reaction (ORR, with an onset potential of 1.0 V and half‐wave potential of 0.84 V) and oxygen evolution reaction (OER, the potential at 10 mA cm−2 is 1.66 V) simultaneously in alkaline, but also outstanding long‐term cycling durability. The excellent bifunctional ORR/OER electrocatalytic performance is ascribed to the synergism of the carbon shell and FeNi alloy core together with the high‐content of nitrogen doped on the large specific surface area graphene‐like carbon.

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Section: Introductionmentioning

confidence: 99%

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

Yang

et al. 2020

Chemistry A European J

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“…In recent years, the design and synthesis of electrocatalysts based on soil‐rich 3d transition metals (such as Fe, Co, Ni, and Cu) has attracted widespread attentions . Bimetallic‐based materials exhibit higher electrocatalytic activity due to synergy between different metal elements compared to single metal based materials .…”

Section: Introductionmentioning

confidence: 99%

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Luo

Zhao

et al. 2019

ChemCatChem

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As a clean energy source, hydrogen may be obtained via overall water splitting. However, the reaction is limited by the anodic oxygen evolution reaction (OER) in the catalytic field. In order to overcome the limitation in OER catalyst activity, this paper attempts to synthesize and develop a series of three-dimensional metal-organic frameworks (MOFs) electrocatalytic materials. The structure and morphology of bimetallic cobalt and nickel MOFs are characterized by FT-IR, Raman, SEM, TEM, and XPS. It is found that the bimetallic cobalt and nickel MOFs have a columnar micro-structure assembled by nanosheets. Further in-situ growth on the iron (Fe) foam to prepare an integrated nanoarray self-supported electrode did not significant change their micro-structure. The obtained bimetal electrocatalysts exhibit significantly enhanced OER activity as compared to the single-metal MOFs counterpart. The cobalt and nickel doubledoped materials in-situ grown on Fe foam exhibited an excellent electrocatalytic activity and remarkable durability with a current density of 10 mA cm À 2 in a 0.1 M KOH solution (with the overpotential of 264 mV and the Tafel slope of 54.3 mV dec À 1 ). There is a significant improvement compared with the material on the glassy carbon electrode. The introduction of the bimetal species (Co and Ni) into the ordered MOFs provides a synergistic effect of the active centers resulting in an enhanced electron transfer and improved electrochemical performance. This work enriches the MOFs electrocatalytic electrode and pave the way for their practical applications.[a] Dr.Reagent: All reagents and materials in this experiment were obtained commercially and were used as received without any further purification. 1,2,4,5-Benzenetetracarboxylic acid (H 4 btec 98 %, AR), NiCl 2 ·6H 2 O (98 %, AR), CoCl 2 ·6H 2 O (98 %, AR), NaOH (96 %, AR), KOH (96 %, AR) and the Nafion solution (5 wt.%) were purchased from J&K Chemical Co. The ultrapure water (18 MΩ cm) was supplied by a Millipore System (Millipore Q). The thickness of iron foam was 0.5 mm. Synthesis of [M 2 (btec)(H 2 O)4]·2H 2 O (M = Ni and Co):The [M 2 (btec) (H 2 O) 4 ]·2H 2 O was synthesized via a hydrothermal process, as previously reported and with minor modifications. [44] The specific synthesis process is as follows: 1.4 mmol of MCl 2 ·6H 2 O (M: Co, Ni, or Co/Ni mixed with 1 : 1 in at.%) and 0.94 mmol of H 4 btec were dissolved in 10 mL ultrapure water, then the pH was adjusted by 2.2 mmol of NaOH. Afterwards, the as-prepared mixture solution was transferred into a 25 mL Teflon stainless-steel autoclave, and heated at 110°C for 72 h. After that, the autoclave was cooled to room temperature, the as-prepared three-dimensional (3D) MOFs were collected after being washed with ultrapure water and dried at 60°C in an oven. The as-obtained red crystals of 3D-CoMOFs were obtained with a yield of 78.6 %, the green crystals of 3D-NiMOFs with a yield of 85.2 %, and the brown crystals of 3DÀ Co/ NiMOFs with a yield of 80.6 %, respectively ( Figure S1). In-situ synthe...

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“…As OER is the primary reaction at the anode, a large amount of the energy in the electrochemical system will be dedicated to it. Therefore, the continued development of catalysts with low overpotential and fast reaction kinetics with high stability to improve OER efficiency remains a scientific and technological challenge [2,3].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

Xu²,

Guo

et al. 2019

SN Appl. Sci.

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In this study, β-PbO 2-Co 3 O 4 composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and Co 3 O 4 particles. The preparation process study shows that the β-PbO 2 bath containing Co 3 O 4 particles becomes more stable for an ultrasonic dispersion time within 30 min, with the stability beginning to decrease after the ultrasonic time exceeds 30 min. Co 3 O 4 particles in the β-PbO 2 bath are positively charged, with anions being adsorbed onto the particles. The nucleation behavior study shows that the electric field force plays a dominant role in the adsorption process for the Co 3 O 4 particles. The nucleation and growth of β-PbO 2 on the Co 3 O 4 particles started for the particles closer to the substrate. In addition, the thickness of the β-PbO 2 layer on the Co 3 O 4 particles was inversely proportional to the distance between the Co 3 O 4 particles and the substrate. Compared to the pure PbO 2 electrode, the oxygen evolution overpotentials for the β-PbO 2-Co 3 O 4 electrode are decreased significantly, which demonstrates an energy-saving effect.

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An active nanoporous Ni(Fe) OER electrocatalyst via selective dissolution of Cd in alkaline media

Cited by 118 publications

References 57 publications

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

FeNi Alloy Nanoparticles Encapsulated in Carbon Shells Supported on N‐Doped Graphene‐Like Carbon as Efficient and Stable Bifunctional Oxygen Electrocatalysts

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Fabrication and nucleation study of β-PbO2–Co3O4 OER energy-saving electrode

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