A flexible solid-state asymmetric supercapacitor device with H-TiO2@MnO2 core–shell NWs as the positive electrode and H-TiO2@C negative is developed. This operates in a 1.8 V voltage window able to deliver high specific capacitance of 139.6 F g−1 maximum volumetric energy density 0.30 mWh cm−3 excellent cycling performance good flexibility.

Oxygen-deficient α-Fe2O3 nanorods with outstanding capacitive performance are developed and demonstrated as novel negative electrodes for flexible asymmetric supercapacitors. The asymmetric-supercapacitor device based on the oxygen-deficient nanorod electrode a MnO2 positive achieves maximum energy density of 0.41 mW·h/cm3; it is also capable charging mobile phone powering light-emitting diode indicator. As service to our authors readers, this journal provides supporting information supplied...

To push the energy density limit of asymmetric supercapacitors (ASCs), a new class anode materials is needed. Vanadium nitride (VN) holds great promise as material for ASCs due to its large specific capacitance, high electrical conductivity, and wide operation windows in negative potential. However, poor electrochemical stability severely limits application SCs. In this work, we demonstrated density, stable, quasi-solid-state ASC device based on porous VN nanowire VOx cathode first time. The...

Metal nitrides have received increasing attention as electrode materials for high-performance supercapacitors (SCs). However, most of them are suffered from poor cycling stability. Here we use TiN an example to elucidate the mechanism causing capacitance loss. X-ray photoelectron spectroscopy analyses revealed that instability is due irreversible electrochemical oxidation during charging/discharging process. Significantly, demonstrate first time can be stabilized without sacrificing its...

Abstract The development of high‐capacity, Earth‐abundant, and stable cathode materials for robust aqueous Zn‐ion batteries is an ongoing challenge. Herein, ultrathin nickel cobaltite (NiCo 2 O 4 ) nanosheets with enriched oxygen vacancies surface phosphate ions (P–NiCo 4‐ x are reported as a new high‐energy‐density material rechargeable batteries. oxygen‐vacancy phosphate‐ion modulation achieved by annealing the pristine NiCo using simple phosphating process. Benefiting from merits...

This work reports a facile method for preparing the new photoactive In2O3 films as well their implementation in photoelectrochemical (PEC) application. We firstly investigated relationship between oxygen vacancies (VO) and PEC performance revealed rule them. found that optimized In2O3−n sample yielded photocurrent density up to 3.83 mA/cm2 1 M Na2SO4 solution under solar illumination. It also gave efficiency high 75% over 400 nm incident-photon-to-current-conversion (IPCE) spectrum, which is...

Large-area manganese oxide nanorod arrays (MONRAs) and herringbones (MOHBs) were successfully synthesized on F-doped SnO2 coated glass (FTO) substrates by a simple electrochemical method. Cyclic voltammetry (CV) galvanostatic charge/discharge measurements demonstrated that the MONRAs MOHBs exhibited excellent specific capacitance good cycling stability in 0.5 M Na2SO4 aqueous solution. For example, of achieves as high 660.7 F g−1 at scan rate 10 mV s−1 485.2 current density 3 A g−1,...

A new class of dual metal and N doped carbon catalysts with well-defined porous structure derived from metal-organic frameworks (MOFs) has been developed as a high-performance electrocatalyst for oxygen reduction reaction (ORR). Furthermore, the microbial fuel cell (MFC) device based on as-prepared Ni/Co codoped air cathode catalyst achieves maximum power density 4335.6 mW m-2 excellent durability.

Hydrogenated ZnO nanorod arrays grown on FTO substrates yield a benchmark specific hydrogen production rate of 122 500 μmol h⁻¹ g⁻¹.

In this paper, we reported an effective and simple strategy to prepare large areal mass loading of MnO2 on porous graphene gel/Ni foam (denoted as MnO2/G-gel/NF) for supercapacitors (SCs). The MnO2/G-gel/NF (MnO2 mass: 13.6 mg cm−2) delivered a capacitance 3.18 F cm−2 (234.2 g−1) good rate capability. prominent electrochemical properties are attributed the enhanced conductivities improved accessible area ions in electrolytes. Moreover, asymmetric supercapacitor (ASC) based 6.1 positive...

The electrochemical stability of metal–nitride (TiN and VN) electrodes is improved by a general strategy involving the addition thin carbon shell to nanowires (NWs), producing [email protected] NWs. effectively suppresses any oxidation reactions, allowing metal nitrides retain their structure, without sacrificing performance for charge storage. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may be re-organized...

Vertically aligned nickel–cobalt oxide (NCO) nanosheets with porous structure were successfully synthesized on FTO substrates by a simple electrochemical method without any templates. Cyclic voltammetry (CV) and galvanostatic charge/discharge measurements show that the NCO have an ideal capacitive performance long-term stability. With optimum amount of Ni, specific capacitance for NCOs could reach as high 453 F g−1 at scan rate 5 mV s−1 506 current density 1 A g−1, showing improvement around...

Abstract Structure deterioration and side reaction, which originated from the solvated H 2 O, are main constraints for practical deployment of both cathode anode in aqueous Zn-ion batteries. Here we formulate a weakly solvating electrolyte to reduce power O strengthen coordination competitiveness SO 4 2− Zn 2+ over O. Experiment results theoretical simulations demonstrate that water-poor solvation structure is achieved, can (i) substantially eliminate solvated-H O-mediated undesirable...

A flexible and solid-state supercapacitor device based on TiO2@C core–shell nanowires has been developed exhibited excellent flexibility—it can even be folded twisted without sacrificing electrochemical properties—and good performance with a maximum energy density of 0.011 mW h cm−3.

Oriented hexagonal CeO2 NRs were directly grown on Ti substrates via a simple template-free electrochemical method. These with {110} planes as the main exposed surfaces show significant photocatalytic activity for hydrogen evolution Na2S–Na2SO3 sacrificial agents due to their special redox capacity.

Herein, we report an effective and simple strategy to greatly improve the photoactivity of CdO nanorods (NRs) by decorating them with CdS. The CdO–CdS heterostructured NRs grown on a FTO substrate exhibited substantially higher visible-light-driven for PEC cell degradation methylene blue (MB) solution compared NRs.

Carbon dots (CDs) sensitized TiO2 was synthesised for water splitting. The resultant photoanode showed an activity that five times higher than of under the visible light irradiation, which results from CDs having strong absorption ability irradiation.

Tungsten disulfide (WS₂) has been emerging as an attractive electrode material for supercapacitors because of its intrinsically layered structure and high capacitance.

We developed a simple electrochemical process for the large-scale fabrication of single crystalline CeO2 octahedrons and nanospheres from DMSO aqueous solution. The with some structural defects have size ranging 200 to 300 nm. Moreover, highly were also obtained via this based on oriented attachment mechanism. absorption edge spheres shows red-shift, that was near visible region.

We report the rational synthesis of carbon and nitrogen co-treated ZnO (denoted as CN/ZnO) nanorod arrays their implementation in photoelectrochemical hydrogen evolution. The CN/ZnO nanorods exhibit an enhanced photocurrent stability owing to improved light-harvesting ability, reduced surface defects increased donor density.