Adjustable anchoring of Ni/Co cations by oxygen-containing functional groups on functionalized graphite paper and accelerated mass/electron transfer for overall water splitting

Huang, Yiyi; Sun, Lei; Yu, Zebin; Jiang, Ronghua; Huang, Jun; Hou, Yanping; Yang, Fei; Zhang, Boge; Zhang, Runzhi; Zhang, Yalan

doi:10.1039/d0cy00181c

Cited by 17 publications

(12 citation statements)

References 44 publications

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“…For many electrochemical applications that utilize graphitic materials such as batteries, electrolyzers, or supercapacitors, surface-active oxygen functional groups (OFGs) at the electrode are considered essential. [1][2][3] It is widely accepted that OFGs work as an effective catalyst towards the occurring redox reactions in a vanadium flow battery (VFB). [4][5][6][7] This has sparked a lot of scientific as well as industrial activities, which focus on the optimization of the carbon-based electrodes by various oxidative treatments.…”

Section: Introductionmentioning

confidence: 99%

“…For many electrochemical applications that utilize graphitic materials such as batteries, electrolyzers, or supercapacitors, surface‐active oxygen functional groups (OFGs) at the electrode are considered essential [1–3] . It is widely accepted that OFGs work as an effective catalyst towards the occurring redox reactions in a vanadium flow battery (VFB) [4–7] .…”

Section: Introductionmentioning

confidence: 99%

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Influence and Electrochemical Stability of Oxygen Groups and Edge Sites in Vanadium Redox Reactions

et al. 2020

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It is widely accepted that surface-active oxygen functional groups (OFGs) effectively catalyze the vanadium redox reactions. Initial graphitic edge sites, OFGs and their electrochemical stability were examined using graphite felts, which were modified with multi-walled carbon nanotubes and activated with KOH. It is demonstrated that OFGs cannot exclusively be responsible for the electrocatalysis since they did not correlate to the electrochemical activity. The surface composition after electrochemical cycling in the positive half-cell was still different for all samples but did not reflect the performance either. However, a correlation was found between the activity and stable edge site defects. There was neither a correlation between the electrocatalytic activity and the amount of oxygen, nor for the kind of OFG in the negative half-cell. The oxygen concentration after electrochemistry was very similar, even more highlighting the importance of edge sites in the V III /V II redox reaction. The results of this work indicate that the major electrocatalytic effect for both half-cell redox reactions is related to stable graphitic edge sites in sufficient quantity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence and Electrochemical Stability of Oxygen Groups and Edge Sites in Vanadium Redox Reactions

et al. 2020

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“…Chang et al reported that graphite was efficiently activated by CO 2 treatment to change the surface area and surface functional groups, leading to low internal resistance and improved charge collection ability, suggesting the enhanced electrochemical behavior of graphite electrodes [12]. Some previous studies also demonstrated that surface modifications of carbon materials led to an increase in polarity of the surface layer, which facilitated the strong interactions to form the strong covalent interfacial bonding with selected substances for the formation of carbon materials/metal nanocomposites, and further highlight its capability to induce the application of a novel electrochemical-based techniques [13][14][15][16].…”

Section: Introductionmentioning

confidence: 91%

Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

et al. 2021

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A simple, efficient, and cost-effective extended graphite as a supporting platform further supported the MnO2 growth for the construction of hierarchical flower-like MnO2/extended graphite. MnO2/extended graphite exhibited an increase in sp2 carbon bonds in comparison with that of extended graphite. It can be expected to display better electrical conductivity and further promote electron/ion transport kinetics for boosting the electrochemical performance in supercapacitors and glucose sensing. In supercapacitors, MnO2/extended graphite delivered an areal capacitance value of 20.4 mF cm−2 at 0.25 mA cm−2 current densities and great cycling stability (capacitance retention of 83% after 1000 cycles). In glucose sensing, MnO2/extended graphite exhibited a good linear relationship in glucose concentration up to about 5 mM, sensitivity of 43 μA mM−1cm−2, and the limit of detection of 0.081 mM. It is further concluded that MnO2/extended graphite could be a good candidate for the future design of synergistic multifunctional materials in electrochemical techniques.

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“…These materials have been utilized as supports or metal-free catalysts in many reactions, such as hydrogenation and CO 2 reduction reactions [ 19 , 20 , 21 ]. OCGs on the surface of carbon can synergistically catalyze its reaction with metal components and effectively strengthen its adsorption capability for different reactants, thus sequentially facilitating the high performance of the metal catalyst [ 22 , 23 ]. OCGs in the carbon matrix can induce local charge redistributions, thereby improving the binding affinity between the activators and the carbon atoms [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen-Containing Group on the Catalytic Performance of Zn/C Catalyst for Acetylene Acetoxylation

Zhu

Kang

2021

Nanomaterials

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In this study, a series of activated carbon-based supports with different oxygen-containing groups (OCGs) proportions were obtained via thermal treatment in an ozone flow. Semiquantitative analyses indicated that the performance of the catalyst attained a maximum after 30 min of treatment with ozone flow, and had a positive correlation with the content ratios of carboxyl and hydroxyl groups. Further, temperature-programmed desorption analysis demonstrated that the high performance (63% acetic acid conversion) of the prepared catalyst for the acetoxylation of acetylene could be ascribed to the reduced strength of increased capacity of acetylene adsorption. Density functional theory proved that the additional –COOH in the dicarboxylic catalytic system could be employed as a support for the active sites, and enhancing C2H2 adsorption strength in the rate-limiting step in the actual experimental process effectively accelerated the reaction rate. Thus, the OCGs on the surface of activated carbon play a crucial role in the catalytic performance of the acetylene acetoxylation catalyst.

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Adjustable anchoring of Ni/Co cations by oxygen-containing functional groups on functionalized graphite paper and accelerated mass/electron transfer for overall water splitting

Abstract: NCS–NCO/FGP0.44 with a cellular network of porous nanosheets and close-contact heterointerface reveals accelerated interfacial mass/electron transportation for overall water splitting.

Cited by 17 publications

References 44 publications

Influence and Electrochemical Stability of Oxygen Groups and Edge Sites in Vanadium Redox Reactions

Influence and Electrochemical Stability of Oxygen Groups and Edge Sites in Vanadium Redox Reactions

Extended Graphite Supported Flower-like MnO2 as Bifunctional Materials for Supercapacitors and Glucose Sensing

Effect of Oxygen-Containing Group on the Catalytic Performance of Zn/C Catalyst for Acetylene Acetoxylation

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