Carbon nanodots modified cobalt phosphate as efficient electrocatalyst for water oxidation

Zhao, Shunyan; Li, Chuanxi; Huang, Hui; Liu, Yang

doi:10.1016/j.jmat.2015.07.003

Cited by 28 publications

(14 citation statements)

References 48 publications

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“…As a benchmark, the overpotential (η) at the current density at 10 mA cm −2 and Tafel slopes (Figure e) in each case were extracted from LSVs and compared in Table 1 . The CoPi network (Figure d, the black curve) demonstrates an overpotential of 0.388 V, a Tafel slope of 61 mV dec −1 , which approaches the performance of previously mentioned carbon dots‐modified CoPi (Table ) . Actually, the catalytic performance of our CoPi network outperforms that of a recently reported ordered crystallized mesoporous CoPi nanostructure which gave similar overpotential and Tafel slope with much more concentrated KOH (i.e., 1.0 m KOH) .…”

Section: Resultssupporting

confidence: 78%

“…[6a,8b,c,9] There are also hydrothermal approaches which generate ordered mesoporous CoPi with different crystallinities . CoPi modified with carbon nanodots has also been attempted . However, porous Co phosphide or phosphate thin films have only been fabricated recently through a series of successive surface treatments followed by the chemical vapor reaction.…”

Section: Introductionmentioning

confidence: 99%

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3D Networks of CoFePi with Hierarchical Porosity for Effective OER Electrocatalysis

Zhou

Zeng

2018

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A series of amorphous 3D Co-based phosphate networks with hierarchical porosity, including the CoPi, the binary CoM Pi and the trinary CoM M Pi (M = Ni , Fe , Ce ) are produced via a novel bitemplate coprecipitation approach at room temperature. Interestingly, the integration of Fe and Co in the same network is found to significantly influence both the porosity and the electronic state of Co . The CoFePi with a Fe to Co mole ratio of 0.91 has a specific surface area of 170 m g and average pore size of 12.3 nm, larger than those of the CoPi network; furthermore, the Co within such CoFePi exhibits a higher oxidation state than that in the CoPi. Due to such structural and compositional merits, the binary CoFePi network shows superior oxygen evolution reaction (OER) electrocatalytic activity, which gives an overpotential as low as 0.315 V at 10 mA cm and a Tafel slope of 33 mV dec in 0.10 m KOH. Additionally, the trinary CoFeNiPi demonstrates similar OER catalytic performance. The two phosphate networks also exhibit remarkable catalytic stability. In view of their easy preparation, superior activity, high stability, and low cost, such transition metal phosphate networks are promising catalysts for practical OER processes.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

3D Networks of CoFePi with Hierarchical Porosity for Effective OER Electrocatalysis

Zhou

Zeng

2018

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“…CDs showed a broad absorption peak located at around 245 nm which corresponds to a typical absorption of sp 2 carbon network which was also supported by the HR-TEM imaging (Fig. 1) 16,85,86 . As can be seen in Fig.…”

Section: Resultssupporting

confidence: 66%

DNA-damage and cell cycle arrest initiated anti-cancer potency of super tiny carbon dots on MCF7 cell line

Şimşek

Şüküroğlu

Yetkin

et al. 2020

Sci Rep

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While carbon-based materials have spearheaded numerous breakthroughs in biomedicine, they also have procreated many logical concerns on their overall toxicity. carbon dots (cDs) as a respectively new member have been extensively explored in nucleus directed delivery and bioimaging due to their intrinsic fluorescence properties coupled with their small size and surface properties. Although various in vitro/in vivo studies have shown that CDs are mostly biocompatible, sufficient information is lacking regarding genotoxicity of them and underlying mechanisms. This study aims to analyze the real-time cytotoxicity of super tiny CDs (2.05 ± 0.22 nm) on human breast cancer cells (MCF7) and human primary dermal fibroblast cell cultures (HDFa) by xCELLigence analysis system for further evaluating their genotoxicity and clastogenicity to evaluate the anti-tumor potential of cDs on breast adenocarcinoma. As combined with flow cytometry studies, comet assay and cytokinesisblock micronucleus assay suggest that the CDs can penetrate to the cell nuclei, interact with the genetic material, and explode DNA damage and G0/G1 phase arrest in cancer cells even at very low concentrations (0.025 ppm) which provide a strong foundation for the design of potentially promising cD-based functional nanomaterials for DnA-damage induced treatment in cancer therapy. Functional nanomaterials that can better target cancer cells that will improve prevention and therapy could be accomplished by the combined efforts of nanotoxicologists, cancer biologists and nanobiomaterial scientists focused on toxicology and related cancer therapy. Engineering carbon-based nanomaterials and their applications are among the most dynamic fields in modern advanced materials science and engineering 1-3. To date, various carbon nanomaterials such as carbon nanotubes 4,5 , fullerenes 6 , graphene 7,8 , graphene oxides 9 , carbon diamonds 10,11 , and carbon dots 12,13 have been synthesized and reported by various researchers. Among these, CDs have become particularly interesting because of their unique physical and chemical properties such as thermal and electrical conductivity, high mechanical strength together with their unique optic and fluorescence features 14-16. They have been used in bio-imaging, drug delivery, nucleus targeting, and labeling, photodynamic therapy, optoelectronics, solar cells, photocatalyst design, photodetectors, and many other biological and engineering fields 17-26. Several methods are available for the synthesis of CDs, namely, laser ablation 15 , electro-oxidation 27 or oxidative acid treatment 12 ; while nowadays, less laborsome and cheaper methods such as hydrothermal 28 and thermal synthesis 24,29,30 , microwave-assisted hydrothermal synthesis 31 , ultrasound synthesis 32 , etc. are popularly exercised. CDs can be synthesized either from inorganic materials 19,33 such as graphene 34 , carbon black 35 , and candle soot 12

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“…The η 10 for CoPPi nanobelts, nanoleaves, and nanorhombuses are determined to be 371, 390, and 424 mV, respectively, higher than that of nanowires. In terms of η 10 , the catalytic performance of our CoPPi nanowires outperforms the reported coralloid Co 2 P 2 O 7 nanocrystal carbon composite catalyst CL‐Co 2 P 2 O 7 @C (397 mV) and most of CoPi catalysts studied in alkaline media, such as mesoporous CoPi (380 mV), Co 3 (PO 4 ) 2 (≈430 mV), and even comparable to that of CoPi@C composite, for example, CC/NPC/CP (430 mV), Co 3 (PO 4 ) 2 @N‐C (317 mV), and CoPi/PCDs (350 mV) …”

mentioning

confidence: 68%

Engineering Morphologies of Cobalt Pyrophosphates Nanostructures toward Greatly Enhanced Electrocatalytic Performance of Oxygen Evolution Reaction

Zhao

et al. 2018

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Herein, a surfactant- and additive-free strategy is developed for morphology-controllable synthesis of cobalt pyrophosphate (CoPPi) nanostructures by tuning the concentration and ratio of the precursor solutions of Na P O and Co(CH COO) . A series of CoPPi nanostructures including nanowires, nanobelts, nanoleaves, and nanorhombuses are prepared and exhibit very promising electrocatalytic properties toward the oxygen evolution reaction (OER). Acting as both reactant and pseudo-surfactant, the existence of excess Na P O is essential to synthesize CoPPi nanostructures for unique morphologies. Among all CoPPi nanostructures, the CoPPi nanowires catalyst renders the best catalytic performance for OER in alkaline media, achieving a low Tafel slope of 54.1 mV dec , a small overpotential of 359 mV at 10 mA cm , and superior stability. The electrocatalytic activities of CoPPi nanowires outperform the most reported non-noble metal based catalysts, even better than the benchmark Ir/C (20%) catalyst. The reported synthesis of CoPPi gives guidance for morphology control of transition metal pyrophosphate based nanostructures for a high-performance inexpensive material to replace the noble metal-based OER catalysts.

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Carbon nanodots modified cobalt phosphate as efficient electrocatalyst for water oxidation

Cited by 28 publications

References 48 publications

3D Networks of CoFePi with Hierarchical Porosity for Effective OER Electrocatalysis

3D Networks of CoFePi with Hierarchical Porosity for Effective OER Electrocatalysis

DNA-damage and cell cycle arrest initiated anti-cancer potency of super tiny carbon dots on MCF7 cell line

Engineering Morphologies of Cobalt Pyrophosphates Nanostructures toward Greatly Enhanced Electrocatalytic Performance of Oxygen Evolution Reaction

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