Vertical-slate-like MoS2 nanostructures on 3D-Ni-foam for binder-free, low-cost, and scalable solid-state symmetric supercapacitors

Abstract In past decades, Ni-based catalytic materials and electrodes have been intensively explored as low-cost hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts for water splitting. With increasing demands for Ni worldwide, simplifying the fabrication process, increasing Ni recycling, and reducing waste are tangible sustainability goals. Here, binder-free, heteroatom-free, and recyclable Ni-based bifunctional catalytic electrodes were fabricated via a one-step quick electrodeposition method. Typically, active Ni nanodot (NiND) clusters are electrodeposited on Ni foam (NF) in Ni(NO3)2 acetonitrile solution. After drying in air, NiO/NiND composites are obtained, leading to a binder-free and heteroatom-free NiO/NiNDs@NF catalytic electrode. The electrode shows high efficiency and long-term stability for catalyzing hydrogen and oxygen evolution reactions at low overpotentials (10ηHER = 119 mV and 50ηOER = 360 mV) and can promote water catalysis at 1.70 V@10 mA cm−2. More importantly, the recovery of raw materials (NF and Ni(NO3)2) is quite easy because of the solubility of NiO/NiNDs composites in acid solution for recycling the electrodes. Additionally, a large-sized (S ~ 70 cm2) NiO/NiNDs@NF catalytic electrode with high durability has also been constructed. This method provides a simple and fast technology to construct high-performance, low-cost, and environmentally friendly Ni-based bifunctional electrocatalytic electrodes for water splitting.

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RuO2-coated vertical graphene hybrid electrodes for high-performance solid-state supercapacitors

Journal of Materials Chemistry A ◽

10.1039/c7ta03355a ◽

2017 ◽

Vol 5 (33) ◽

pp. 17293-17301 ◽

Cited By ~ 52

Author(s):

Zhao Jun Han ◽

Shafique Pineda ◽

Adrian T. Murdock ◽

Dong Han Seo ◽

Kostya (Ken) Ostrikov ◽

...

Keyword(s):

Energy Storage ◽

Solid State ◽

Frequency Response ◽

Electrical Resistance ◽

High Performance ◽

Low Cost ◽

Energy Storage Devices ◽

Storage Devices ◽

Binder Free ◽

Excellent Stability

Solid-state supercapacitors can be fabricated by uniformly coating RuO2onto vertical graphene (VG) using a simple, scalable, low-cost and solution-free method. The binder-free RuO2/VG hybrid electrodes possess a high areal capacitance, low electrical resistance, good frequency response, and excellent stability, shedding light on the commercialisation of Ru-based energy storage devices.

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In Situ Binder-Free and Hydrothermal Growth of Nanostructured NiCo2S4/Ni Electrodes for Solid-State Hybrid Supercapacitors

Energies ◽

10.3390/en14217114 ◽

2021 ◽

Vol 14 (21) ◽

pp. 7114

Author(s):

M. Mohamed Ismail ◽

Zhong-Yun Hong ◽

M. Arivanandhan ◽

Thomas Chung-Kuang Yang ◽

Guan-Ting Pan ◽

...

Keyword(s):

Solid State ◽

Hydrothermal Method ◽

Negative Electrode ◽

Ni Foam ◽

Hybrid Supercapacitors ◽

Storage Behavior ◽

Binder Free ◽

Cbd Method ◽

Power Densities

Herein, we report a comparison of the electrochemical performance of two kinds of NiCo2S4-based electrodes for solid-state hybrid supercapacitors (HSCs). For the binder-free electrode, NiCo2S4 was grown on Ni foam by the chemical bath deposition (CBD) method. For the binder-using electrode, NiCo2S4 powder was synthesized by the hydrothermal method. FESEM images depicted the hierarchical nanostructure of NiCo2S4 synthesized by the hydrothermal method and uniform distribution of nanostructured NiCo2S4 grown on Ni foam by the CBD method. Half-cell studies of both NiCo2S4 electrodes showed them exhibiting battery-type charge storage behavior. To assemble HSCs, NiCo2S4 and activated carbon were used as a positive and negative electrode, respectively. Electrochemical studies of the HSCs showed that the accessible potential window was wide, up to 2.6 V, through cyclic voltammetry (CV) analysis. Chronopotentiometry (CP) studies revealed that the energy and power densities of binder-using HSC were 51.24 Wh/kg and 13 kW/kg at 1 Ag−1, respectively, which were relatively higher than those of the binder-free HSC. The binder-free HSC showed 52% cyclic stability, relatively higher than that of the binder-using HSC. Both HSCs, with unique benefits and burdens on energy storage performance, are discussed in this work.

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Cobalt Nanoparticle-Embedded Nitrogen-Doped Carbon Catalyst Derived from a Solid-State Metal-Organic Framework Complex for OER and HER Electrocatalysis

Energies ◽

10.3390/en14051320 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1320

Author(s):

Shaik Gouse Peera ◽

Ravindranadh Koutavarapu ◽

Chao Liu ◽

Gaddam Rajeshkhanna ◽

Arunchander Asokan ◽

...

Keyword(s):

Solid State ◽

Alkaline Medium ◽

Glassy Carbon ◽

Metal Organic Framework ◽

Electronic Conductivity ◽

Organic Ligand ◽

Synthesis Process ◽

Ni Foam ◽

Shell Nanoparticles ◽

Energy Devices

Electrochemical water splitting is considered a promising way of producing hydrogen and oxygen for various electrochemical energy devices. An efficient single, bi-functional electrocatalyst that can perform hydrogen evolution reactions (HERs) and oxygen evolution reactions (OERs) is highly essential. In this work, Co@NC core-shell nanoparticles were synthesized via a simple, eco-friendly, solid-state synthesis process, using cobalt nitrate and with pyrazole as the N and C source. The morphological analysis of the resulting Co@NC nanoparticles was performed with a scanning and transmission electron microscope, which showed Co nanoparticles as the core and the pyrolysis of pyrazole organic ligand N-doped carbon derived shell structure. The unique Co@NC nanostructures had excellent redox sites for electrocatalysis, wherein the N-doped carbon shell exhibited superior electronic conductivity in the Co@NC catalyst. The resulting Co@NC nanocatalyst showed considerable HER and OER activity in an alkaline medium. The Co@NC catalyst exhibited HERs overpotentials of 243 and 170 mV at 10 mA∙cm−2 on glassy carbon and Ni foam electrodes, respectively, whereas OERs were exhibited overpotentials of 450 and 452 mV at a current density of 10 and 50 mA∙cm−2 on glassy carbon electrode and Ni foam, respectively. Moreover, the Co@NC catalyst also showed admirable durability for OERs in an alkaline medium.

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Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Nanomaterials ◽

10.3390/nano11030657 ◽

2021 ◽

Vol 11 (3) ◽

pp. 657

Author(s):

Geul Han Kim ◽

Yoo Sei Park ◽

Juchan Yang ◽

Myeong Je Jang ◽

Jaehoon Jeong ◽

...

Keyword(s):

High Activity ◽

Cobalt Oxide ◽

Oxygen Evolution ◽

Oxygen Evolution Reaction ◽

Low Cost ◽

High Surface ◽

High Surface Area ◽

Cobalt Hydroxide ◽

Ni Foam ◽

Electron Conduction

Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.

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All-Solid-State Potentiometric Ion-Sensors Based on Tailored Imprinted Polymers for Pholcodine Determination

Polymers ◽

10.3390/polym13081192 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1192

Author(s):

Hisham S. M. Abd-Rabboh ◽

Abd El-Galil E. Amr ◽

Abdulrahman A. Almehizia ◽

Ayman H. Kamel

Keyword(s):

Solid State ◽

Low Cost ◽

Cost Effective ◽

Pharmaceutical Formulations ◽

Measurement Sensitivity ◽

Serum Samples ◽

Multiwalled Carbon ◽

Imprinted Polymers ◽

High Measurement ◽

Liquid Chromatographic

In recent times, the application of the use of ion-selective electrodes has expanded in the field of pharmaceutical analyses due to their distinction from other sensors in their high selectivity and low cost of measurement, in addition to their high measurement sensitivity. Cost-effective, reliable, and robust all-solid-state potentiometric selective electrodes were designed, characterized, and successfully used for pholcodine determination. The design of the sensor device was based on the use of a screen-printed electrode modified with multiwalled carbon nanotubes (MWCNTs) as a solid-contact transducer. Tailored pholcodine (PHO) molecularly imprinted polymers (MIPs) were prepared, characterized, and used as sensory receptors in the presented potentiometric sensing devices. The sensors exhibited a sensitivity of 31.6 ± 0.5 mV/decade (n = 5, R2 = 0.9980) over the linear range of 5.5 × 10−6 M with a detection limit of 2.5 × 10−7 M. Real serum samples in addition to pharmaceutical formulations containing PHO were analyzed, and the results were compared with those obtained by the conventional standard liquid chromatographic approach. The presented analytical device showed an outstanding efficiency for fast, direct, and low-cost assessment of pholcodine levels in different matrices.

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Vertically Aligned Few-Layer Crumpled MoS2 Hybrid Nanostructure on Porous Ni Foam toward Promising Binder-Free Methanol Electro-Oxidation Application

Energy & Fuels ◽

10.1021/acs.energyfuels.1c00957 ◽

2021 ◽

Author(s):

Arthi Gopalakrishnan ◽

Lignesh Durai ◽

Jiaojiao Ma ◽

Chang Yi Kong ◽

Sushmee Badhulika

Keyword(s):

Hybrid Nanostructure ◽

Ni Foam ◽

Binder Free ◽

Vertically Aligned ◽

Electro Oxidation

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Organic electrode materials for non-aqueous, aqueous, and all-solid-state Na-ion batteries

Journal of Materials Chemistry A ◽

10.1039/d1ta00528f ◽

2021 ◽

Author(s):

Kathryn Holguin ◽

Motahareh Mohammadiroudbari ◽

Kaiqiang Qin ◽

Chao Luo

Keyword(s):

Solid State ◽

High Performance ◽

Electrode Materials ◽

Low Cost ◽

Li Ion Batteries ◽

Organic Electrode ◽

Li Ion

Na-ion batteries (NIBs) are promising alternatives to Li-ion batteries (LIBs) due to the low cost, abundance, and high sustainability of sodium resources. However, the high performance of inorganic electrode materials...

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Hierarchical porous CeO2 micro rice supported Ni foam binder free electrode and its enhanced pseudocapacitor performance by redox additive electrolyte

New Journal of Chemistry ◽

10.1039/d1nj01877a ◽

2021 ◽

Author(s):

Arunpandiyan Surulinathan ◽

Raja Annamalai ◽

Vinoth S ◽

Alagarsamy Pandikumar ◽

Ayyaswamy Arivarasan

Keyword(s):

High Performance ◽

Ni Foam ◽

Hierarchically Porous ◽

Hierarchical Porous ◽

The Future ◽

Binder Free ◽

Supported Ni

Developing high-performance, robust, and economic supercapacitor is a promising path to the future electric vehicle’s technology. Herein, a hierarchically porous CeO2 micro rice was attached on the Ni foam surface...

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