Double 2-dimensional H 2 -evoluting catalyst tipped photocatalyst nanowires: A new avenue for high-efficiency solar to H 2 generation

Zhang, Kan; Qian, Shifeng; Kim, Wanjung; Kim, Jung Kyu; Sheng, Xiaowei; Lee, Jun Young; Park, Jae Hyung

doi:10.1016/j.nanoen.2017.03.005

Cited by 58 publications

(24 citation statements)

References 42 publications

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“…[58] In the lower frequency region, the slope of the curve represents the Warburg resistance that evaluates the diffusion resistance of ion in the electrolyte to the electrode surface. [60] The a-MnS/rGO electrode exhibits a relatively vertical line in the low-frequency region, which indicates the more facile diffusion of electrolyte to the surface of the electrode, resulting in a better capacitive performance. These results confirm that the presence of rGO nanosheets significantly enhances electrical conductivity, and thus effectively improve the capacitance of the a-MnS/GO electrode.…”

Section: Electrochemical Performancementioning

confidence: 99%

Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

et al. 2018

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The α‐MnS nanoflakes/rGO sheets were obtained via a facile one‐step hydrothermal approach using carbon disulfide as sulfur source, and ethylenediamine as a complexing agent which forms a complex with Mn2+ ions. Oil droplets of carbon disulfide and water are bridged via the hydrophobic/hydrophilic nature of ethylenediamine. α‐MnS/rGO was successfully co‐doped by nitrogen and sulfur by the action of ethylenediamine and CS2, respectively. The as‐prepared material exhibits an excellent electrochemical performance with a remarkable specific capacitance of 700 F g−1 at a current density of 1 A g−1, high rate capability of 66.65% retention at 20 A g−1 and superior cycling stability of 127% capacitance retention after 10000 cycles. To further explore the electrochemical performance of α‐MnS/rGO, a hybrid supercapacitor device was assembled using the α‐MnS/rGO as a positive electrode and an activated carbon as a negative electrode. The fabricated device exhibits the highest energy density of 38.13 Wh kg−1 at a power density of 850 W kg−1 and still retains 21.25 Wh kg−1 at a power density of 17 kW kg−1. These superior results demonstrate that the α‐MnS/rGO nanoflakes electrode can be considered as a promising material for high‐performance supercapacitors.

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Section: Electrochemical Performancementioning

confidence: 99%

Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

et al. 2018

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“…Efficiency and stability of common electrode materials exploited as anodes in water electrolysis cells critically depend on the pH value of the electrolyte. Both performance and durability of electrocatalysts based on earth-abundant elements toward OER in neutral and alkaline regime has been significantly improved 6,[16][17][18][19][20][21][22][23][24][25][26][27][28] and is not any more a crucial point. Alkaline water electrolysis can therefore be seen as the most widespread and mature technology.…”

Section: Introductionmentioning

confidence: 99%

Steel-based electrocatalysts for efficient and durable oxygen evolution in acidic media

Schäfer

Küpper

Schmidt

et al. 2018

Catal. Sci. Technol.

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2High overpotentials, particularly an issue of common anode materials, hamper the process of water electrolysis for clean energy generation. Thanks to immense research efforts up to date oxygen evolution electrocatalysts based on earth-abundant elements work efficiently and stably in neutral and alkaline regimes. However, non-noble metal-based anode materials that can withstand low pH regimes are considered to be an indispensable prerequisite for the water splitting to succeed in the future.All oxygen evolving electrodes working durably and actively in acids contain Ir at least as an additive. Due to its scarcity and high acquisition costs noble elements like Pt, Ru and Ir need to be replaced by earth abundant elements. We have evaluated a Ni containing stainless steel for use as an oxygen-forming electrode in diluted H 2 SO 4 . Unmodified Ni42 steel showed a significant weight loss after long term OER polarization experiments. Moreover, a substantial loss of the OER performance of the untreated steel specimen seen in linear sweep voltammetry measurements turned out to be a serious issue. However, upon anodization in LiOH, Ni42 alloy was rendered in OER electrocatalysts that exhibit under optimized synthesis conditions stable overpotentials down to 445 mV for 10 mA cm -2 current density at pH 0. Even more important: The resulting material has proven to be robust upon long-term usage (weight loss: 20 µg/mm 2 after 50 ks of chronopotentiometry at pH 1) towards OER in H 2 SO 4 . Our results suggest that electrochemical oxidation of Ni42 steel in LiOH (sample Ni42Li205) results in the formation of a metal oxide containing outer zone that supports solution route-based oxygen evolution in acidic regime accompanied by a good stability of the catalyst.3

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“…Among them, due to the limiting availability of fossil fuels and associated environmental concerns, the electrochemical energy storage devices like Li + batteries and supercapacitors are expected to become more popular in near future. The performance of energy storage devices is associated with the nanostructures of synthesized materials especially their shape and size which have attained noteworthy attention both in fundamental and applied research areas [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Nanostructured polycrystalline Ni₃S₂ as electrode material for lithium ion batteries

Khan

Medwal

Fareed

et al. 2020

Mater. Res. Express

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We report the facile synthesis of nanostructured polycrystalline nickel sulphide (NP-Ni 3 S 2 ) on Ni foil at 750 and 800°C by employing powder vapor transport technique. X-ray diffraction patterns (XRD) confirms the formation of polycrystalline Ni 3 S 2 phase with rhombohedral structure. Raman spectroscopy and x-ray photo-electron spectroscopy (XPS) further confirms the formation of Ni 3 S 2 phase. Scanning electron microscopy (SEM) reveals the formation of flower shaped nanostructures of NP-Ni 3 S 2 material. As an electrode material of Li + batteries, the initial discharge capacities for NP-Ni 3 S 2 materials deposited at 750 and 800°C are found to be ∼2649 mAh g −1 and ∼1347 mAh g −1 , respectively with initial capacity loss of ∼1067 mAh g −1 and ∼363 mAh g −1 after first cycle and capacities of ∼931 mAh g −1 and ∼818 mAh g −1 after 30 cycles for a current density of 60 mA g −1 . An excellent capacity retention for NP-Ni 3 S 2 material synthesized at 800°C is due to its larger surface area and shorter diffusion length for mass and charge transport brought about by the flower-like porous nanostructures showing that the NP-Ni 3 S 2 material synthesized at higher temperatures is more suitable as electrode material for Li + batteries.

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Double 2-dimensional H 2 -evoluting catalyst tipped photocatalyst nanowires: A new avenue for high-efficiency solar to H 2 generation

Cited by 58 publications

References 42 publications

Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

Steel-based electrocatalysts for efficient and durable oxygen evolution in acidic media

Nanostructured polycrystalline Ni₃S₂ as electrode material for lithium ion batteries

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Double 2-dimensional H 2 -evoluting catalyst tipped photocatalyst nanowires: A new avenue for high-efficiency solar to H 2 generation

Cited by 58 publications

References 42 publications

Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

Hydrothermal Synthesis of α‐MnS Nanoflakes@Nitrogen and Sulfur Co‐doped rGO for High‐Performance Hybrid Supercapacitor

Steel-based electrocatalysts for efficient and durable oxygen evolution in acidic media

Nanostructured polycrystalline Ni3S2 as electrode material for lithium ion batteries

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Product

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Nanostructured polycrystalline Ni₃S₂ as electrode material for lithium ion batteries