Incorporating Nitrogen-Doped Graphene Quantum Dots and Ni<sub>3</sub>
S<sub>2</sub>
 Nanosheets: A Synergistic Electrocatalyst with Highly Enhanced Activity for Overall Water Splitting

Lv, Jingjing; Zhao, Jun; Fang, Hua; Jiang, Liping; Li, Lingling; Ma, Jing; Zhu, Jun‐Jie

doi:10.1002/smll.201700264

Cited by 128 publications

(48 citation statements)

References 55 publications

(85 reference statements)

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“…To further verify the aforementioned results, the EIS measurements on Co 9 S 8 @C were performed at η=0.47 V from 10 5 to 0.01 Hz with an AC voltage of 5 mV. As shown in Figure c and the inset, these semicircle‐like patterns can be fitted using an equivalent circuit . By calculating all the fitted data for the Nyquist plots, it is found that R ct and R s values increase in the following order: Co 9 S 8 @C‐2 (R ct =2.76 Ω; R s =7.26 Ω)<Co 9 S 8 @C‐10 (R ct =4.81 Ω; R s =7.55 Ω)<Co 9 S 8 @C‐20 (R ct =9.65 Ω; R s =8.39 Ω).…”

Section: Resultsmentioning

confidence: 73%

Facile and Controllable One‐Pot Synthesis of Hierarchical Co₉S₈ Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

2017

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Hierarchical Co 9 S 8 hollow microspheres with nanosheet building units are synthesized via a one-step hydrothermal method. The presence of glucose in the synthesis is essential to the formation of the hollow structure and influences the size and morphology of the microspheres. Benefiting from the advantages of a hollow architecture, a conductive carbon coating and Co 9 S 8 nanosheet units, the composite exhibits outstanding electrochemical properties. When the composite electrode is evaluated as the cathode material for supercapacitors, it exhibits a high specific capacitance of 514 F g À1 at 1.0 A g À1 and a capacitance retention of circa 88 % over 1000 cycles at 8 A g À1 .On the other hand, the nanosheet-constructed hollow structure can efficiently promote the electrocatalytic activity of Co 9 S 8 toward the oxygen evolution reaction. Due to the fact that Co 9 S 8 nanosheets impart largely exposed active sites, the composite exhibits a low Tafel slope of 66 mV dec À1 and no obvious degradation after 12 h water oxidation.

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Section: Resultsmentioning

confidence: 73%

Facile and Controllable One‐Pot Synthesis of Hierarchical Co₉S₈ Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

2017

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“…To minimize the energy loss between the electrode and active sites in which the reaction takes place, the electronic conductivity of the catalyst and the interface between catalyst and electrode should be optimized. To address this issue, several effective approaches, including utilization of metallic nonoxide catalysts, and combining catalysts with conductive supports, have recently been developed and will be discussed in this part.…”

Section: Optimization Strategies For Transition Metal Based Oer Catalmentioning

confidence: 99%

First‐Row Transition Metal Based Catalysts for the Oxygen Evolution Reaction under Alkaline Conditions: Basic Principles and Recent Advances

Zhou

et al. 2017

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thermodynamic equilibrium potential, as shown in Figure 1. The HER process involves electro chemical H + adsorption and electrochemical/chemical desorption of H 2 , which is a two-electron transport process to generate a single H 2 molecule. By contrast, OER undergoes a four-electron transport coupled with the breaking of the OH bond, and the formation of the OO bond; therefore, for a kinetically hindered process, a high potential is needed to overcome the kinetic energy barriers. [12] To date, the OER remains a bottleneck in water splitting. Therefore, enormous efforts have been devoted to design and discover novel OER catalysts to satisfy the economic production of hydrogen from water splitting.Thus far, the benchmarks of OER catalysts in acidic solution are RuO 2 and IrO 2 , which are located on top of the volcanoplot, and express a relatively low overpotential (η), high current density, small Tafel slope, and high durability. [13,14] However, the wide utilization of RuO 2 or IrO 2 is hindered by high cost and insufficient reserves in the earth. Moreover, the aforementioned noble metal oxides are not the best OER electrocatalysts under alkaline conditions anymore. Their OER performances have been exceeded by several first-row transition metal based compounds (FTMCs). [15][16][17][18][19][20][21] Therefore, considerable attention has been focused on cost-effective alternatives that feature high electrocatalytic activity and life span. However, a relatively high overpotential (>300 mV) is still required by these nonprecious catalysts to reach a current density of 10 mA cm −2 , a widely used figure of merit that is equivalent to 12% solar-to-hydrogen efficiency. Thus, improving OER performance based on FTMCs is of great significance.Previous discoveries demonstrated that elemental doping is effective to boost the performance of FTMCs, given that the electronic structure of the catalysts can be tuned by dopants. [12,15] A well-known example is iron-doped nickel compounds, with trace amounts of iron-doped nickel hydroxides possibly enhancing the catalytic activity of OER significantly. [21][22][23] Thus, considerable efforts have been focused on optimizing elemental doping species and concentration and identifying the active sites of the catalysts. In addition to elemental doping, several novel and advantageous strategies have been developed Owing to its abundance, high gravimetric energy density, and environmental friendliness, hydrogen is a promising renewable energy to replace fossil fuels. One of the most prominent routes toward hydrogen acquisition is water splitting, which is currently bottlenecked by the sluggish kinetics of oxygen evolution reaction (OER). Numerous of electrocatalysts have been developed in the past decades to accelerate the OER process. Up to now, the first-row transition metal based compounds are in pole position under alkaline conditions, which have become subjects of extensive studies. Recently, significant advances in providing compelling catalytic performance as well as exploring t...

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“…[92] and CoP [93] can boost the HER performance owning to CQDs could reduce the bandgap and enhance charge transfer.…”

Section: Electrocatalysismentioning

confidence: 99%

Electrochemistry in Carbon‐based Quantum Dots

Ding

Niu

Zhang

et al. 2020

Chemistry An Asian Journal

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Electrochemistry belongs to an important branch of chemistry that deals with the chemical changes produced by electricity and the production of electricity by chemical changes. Therefore, it can not only act a powerful tool for materials synthesis, but also offer an effective platform for sensing and catalysis. As extraordinary zero-dimensional materials, carbon-based quantum dots (CQDs) have been attracting tremendous attention due to their excellent properties such as good chemical stability, environmental friendliness, nontoxicity and abundant resources. Compared with the traditional methods for the preparation of CQDs, electrochemical (EC) methods offer advantages of simple instrumentation, mild reaction conditions, low cost and mass production. In return, CQDs could provide cost-effective, environmentally friendly, biocompatible, stable and easilyfunctionalizable probes, modifiers and catalysts for EC sensing. However, no specific review has been presented to systematically summarize both aspects until now. In this review, the EC preparation methods of CQDs are critically discussed focusing on CQDs. We further emphasize the applications of CQDs in EC sensors, electrocatalysis, biofuel cells and EC flexible devices. This review will further the experimental and theoretical understanding of the challenges and future prospective in this field, open new directions on exploring new advanced CQDs in EC to meet the high demands in diverse applications.[a] Dr.

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Incorporating Nitrogen-Doped Graphene Quantum Dots and Ni₃ S₂ Nanosheets: A Synergistic Electrocatalyst with Highly Enhanced Activity for Overall Water Splitting

Cited by 128 publications

References 55 publications

Facile and Controllable One‐Pot Synthesis of Hierarchical Co₉S₈ Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

Facile and Controllable One‐Pot Synthesis of Hierarchical Co₉S₈ Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

First‐Row Transition Metal Based Catalysts for the Oxygen Evolution Reaction under Alkaline Conditions: Basic Principles and Recent Advances

Electrochemistry in Carbon‐based Quantum Dots

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Incorporating Nitrogen-Doped Graphene Quantum Dots and Ni3 S2 Nanosheets: A Synergistic Electrocatalyst with Highly Enhanced Activity for Overall Water Splitting

Cited by 128 publications

References 55 publications

Facile and Controllable One‐Pot Synthesis of Hierarchical Co9S8 Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

Facile and Controllable One‐Pot Synthesis of Hierarchical Co9S8 Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

First‐Row Transition Metal Based Catalysts for the Oxygen Evolution Reaction under Alkaline Conditions: Basic Principles and Recent Advances

Electrochemistry in Carbon‐based Quantum Dots

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Incorporating Nitrogen-Doped Graphene Quantum Dots and Ni₃ S₂ Nanosheets: A Synergistic Electrocatalyst with Highly Enhanced Activity for Overall Water Splitting

Facile and Controllable One‐Pot Synthesis of Hierarchical Co₉S₈ Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

Facile and Controllable One‐Pot Synthesis of Hierarchical Co₉S₈ Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion