Metal organic framework-modified nitrogen-doped graphene oxygen reduction reaction catalyst synthesized by nanoscale high-energy wet ball-milling structural and electrochemical characterization

Zhuang, Shiqiang; Nunna, Bharath Babu; Lee, Eon Soo

doi:10.1557/mrc.2017.130

Cited by 22 publications

(20 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The precursor material was ground for 16 h, and the grinding speed was controlled and varied, because the high energy from the ball mill can impact the physical and chemical properties of the ZIF-8 particles. It was observed that at 350 RPM the catalyst showed the optimum current density, which was even higher than current density of 10 wt % Pt/C [22]. This increase in the electrochemical performance of the catalyst was attributed to the micro porosity induced by the ZIF-8 structure and the chemical interactions of N-G and ZIF-8 particles, which increased the pyridinic active sites on the imidazolate framework and also enhanced the surface density of the active sites for improved ORR [22][23][24].…”

Section: Resultsmentioning

confidence: 93%

“…It can be seen from Figure 2e,f that the N-G/MOF catalyst had both amorphous and crystalline structures inherited from N-G and MOF structures, with an average particle size of 955 nm. From our previous study, it was proven that nitrogen-doping and particle size can be controlled by the grinding speed and grinding time of ball milling [20][21][22].…”

Section: Morphologymentioning

confidence: 99%

“…Specifically, the nanoscale high energy wet (NHEW) ball milling method was implemented, in which the activation energy was obtained from collisions of the grinding balls and the precursor materials. Various parameters such as the grinding speed and grinding time were carefully controlled to optimize the catalyst's ORR catalytic activity [20][21][22]. The electrochemical performance (current density) of N-G/MOF catalysts was better than the 10 wt % Pt/C catalyst under similar experimental conditions [22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Stability and Potential Cycling Durability of Nitrogen-Doped Graphene Modified by Metal-Organic Framework for Oxygen Reduction Reactions

et al. 2018

Self Cite

View full text Add to dashboard Cite

Here we report a nitrogen-doped graphene modified metal-organic framework (N-G/MOF) catalyst, a promising metal-free electrocatalyst exhibiting the potential to replace the noble metal catalyst from the electrochemical systems; such as fuel cells and metal-air batteries. The catalyst was synthesized with a planetary ball milling method, in which the precursors nitrogen-functionalized graphene (N-G) and ZIF-8 are ground at an optimized grinding speed and time. The N-G/MOF catalyst not only inherited large surface area from the ZIF-8 structure, but also had chemical interactions, resulting in an improved Oxygen Reduction Reaction (ORR) electrocatalyst. Thermogravimetric Analysis (TGA) curves revealed that the N-G/MOF catalyst still had some unreacted ZIF-8 particles, and the high catalytic activity of N-G particles decreased the decomposition temperature of ZIF-8 in the N-G/MOF catalyst. Also, we present the durability study of the N-G/MOF catalyst under a saturated nitrogen and oxygen environment in alkaline medium. Remarkably, the catalyst showed no change in the performance after 2000 cycles in the N2 environment, exhibiting strong resistance to the corrosion. In the O2 saturated electrolyte, the performance loss at lower overpotentials was as low compared to higher overpotentials. It is expected that the catalyst degradation mechanism during the potential cycling is due to the oxidative attack of the ORR intermediates.

show abstract

Section: Resultsmentioning

confidence: 93%

Section: Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal Stability and Potential Cycling Durability of Nitrogen-Doped Graphene Modified by Metal-Organic Framework for Oxygen Reduction Reactions

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The serum is the fluid that remains after removing fibrinogen, also referred to as clotting agents. The serum is harder to obtain because it needs additional separation [64][65][66][67]. Sample extraction is not limited to the options mentioned above.…”

Section: Specimen and Sample Typesmentioning

confidence: 99%

COVID-19 Biomarkers and Advanced Sensing Technologies for Point-of-Care (POC) Diagnosis

et al. 2021

Self Cite

View full text Add to dashboard Cite

COVID-19, also known as SARS-CoV-2 is a novel, respiratory virus currently plaguing humanity. Genetically, at its core, it is a single-strand positive-sense RNA virus. It is a beta-type Coronavirus and is distinct in its structure and binding mechanism compared to other types of coronaviruses. Testing for the virus remains a challenge due to the small market available for at-home detection. Currently, there are three main types of tests for biomarker detection: viral, antigen and antibody. Reverse Transcription-Polymerase Chain Reaction (RT-PCR) remains the gold standard for viral testing. However, the lack of quantitative detection and turnaround time for results are drawbacks. This manuscript focuses on recent advances in COVID-19 detection that have lower limits of detection and faster response times than RT-PCR testing. The advancements in sensing platforms have amplified the detection levels and provided real-time results for SARS-CoV-2 spike protein detection with limits as low as 1 fg/mL in the Graphene Field Effect Transistor (FET) sensor. Additionally, using multiple biomarkers, detection levels can achieve a specificity and sensitivity level comparable to that of PCR testing. Proper biomarker selection coupled with nano sensing detection platforms are key in the widespread use of Point of Care (POC) diagnosis in COVID-19 detection.

show abstract

“…Therefore, efforts have been made to develop Pt alternative catalysts for ORR. In alkaline media, electrocatalysts with various categories have been developed, further, the corresponding mechanisms have been explored, including nonmetal-doped carbon materials [4][5][6][7][8], carbon-transition metal hybrids [9][10][11][12][13][14][15][16][17][18][19][20], metal organic framework-modified nitrogen-doped graphene [21][22][23], and transition metal oxides [24][25][26][27][28]. Nonmetal heteroatom doped carbon materials and transition metal oxides have especially been given attention due to their advantages of high electron conductivity and favorable redox reversibility, respectively [29,30].…”

Section: Introductionmentioning

confidence: 99%

Core-Shell Fe3O4@NCS-Mn Derived from Chitosan-Schiff Based Mn Complex with Enhanced Catalytic Activity for Oxygen Reduction Reaction

Wang

et al. 2019

Catalysts

View full text Add to dashboard Cite

A core-shell type of Fe3O4/NCS-Mn composite was prepared by pyrolyzing a precursor fabricated by coating a chitosan-Schiff base Mn complex on Fe3O4 cores. For comparison purposes, the Fe3O4@NCS sample in the absence of Mn and the Fe3O4@NC sample derived from just chitosan coating Fe3O4 were also prepared. Among the three catalysts, Fe3O4@NCS-Mn demonstrates the best electrocatalytic activity compared to commercial Pt/C (20%) for oxygen reduction reaction (ORR). The average of the transferred electron number (n) approached 3.6 in the range of −0.3 to −0.8 V (vs. Ag/AgCl). Moreover, the catalyst exhibited high stability and durability against methanol and may potentially be a promising ORR catalyst for fuel cells.

show abstract

Metal organic framework-modified nitrogen-doped graphene oxygen reduction reaction catalyst synthesized by nanoscale high-energy wet ball-milling structural and electrochemical characterization

Abstract: Abstract

Cited by 22 publications

References 19 publications

Thermal Stability and Potential Cycling Durability of Nitrogen-Doped Graphene Modified by Metal-Organic Framework for Oxygen Reduction Reactions

Thermal Stability and Potential Cycling Durability of Nitrogen-Doped Graphene Modified by Metal-Organic Framework for Oxygen Reduction Reactions

COVID-19 Biomarkers and Advanced Sensing Technologies for Point-of-Care (POC) Diagnosis

Core-Shell Fe3O4@NCS-Mn Derived from Chitosan-Schiff Based Mn Complex with Enhanced Catalytic Activity for Oxygen Reduction Reaction

Contact Info

Product

Resources

About