Carbon-based materials are mostly used in supercapacitor due to control porosity, higher surface area, and easy processing for electrode production. However, it is still challenging to fabricate ...carbon/metal oxide-based nanocomposite electrodes with various structures and configurations for supercapacitors, particularly for miniaturized electronics. Here, in the present study, CeO
2
–Nd
2
O
3
/rGO ternary nanocomposite was synthesized by facial co-precipitation route, which evident enhanced capacitive performance than CeO
2
–Nd
2
O
3
binary composite, bare CeO
2,
and Nd
2
O
3
. The rGO was homogeneously anchored on the surface of CeO
2
–Nd
2
O
3
nanoparticles, forming a semi-spherical morphology. The electrochemical performance of all electrodes was investigated by different measurements. The ternary composite have a higher specific capacitance of 1265 F g
−1
at 3 A g
−1
current density and maintained 99% retention after 2000th cycles, showing excellent cycling performance and rate capability compared to other grown products. The excellent electrochemical pseudocapacitive performance of the ternary composite-based electrode could be ascribed due to rGO and its interfacial contact with CeO
2
–Nd
2
O
3
. The improved electrode conductivity generates plentiful active sites for charging and discharging and provides an easy path for the fast transportation of ions. These results open an innovative pathway for fabricating rGO and metal oxide-based composite in developing electrochemical energy storage devices for commercial production.
Graphical abstract
Potentially superior to rare earth metal-containing electrocatalysts for the oxygen evolution reaction electrolysis, transition metal chalcogenides have yet to reach a catalytic activity that would ...allow them to be extensively adopted. In light of this, it is crucial to develop coherent designs for transition metal-based electrocatalysts on conducting polymer support to achieve high-efficiency OER. Herein, we present an easy solvothermal synthesis and exceptional catalytic performance of CoSe@gCN as an OER electrocatalyst in basic media. The synthesized materials were observed by various analysis. The phase composition confirmed by the X-rays diffraction (XRD) technique and further morphological analysis indicates the morphology of CoSe@gCN, which are considered responsible for revealing a great number of active spots and enhanced electrochemically active surface area. On the other hand, superior OER crusade and stability of the CoSe@gCN electrode with (overpotential of 174 mV, Tafel slope of 57 mV dec
−1
) in 1.0 M basic KOH are caused by the NF's excellent conductivity and highly porous framework, and a higher value of specific surface area. It also maintained high stability for almost 20 h, showing the higher OER activity in industrial application. As a result, our findings interpret that the transition metal chalcogenides with certain morphology can enhance electrocatalytic efficiency with graphitic carbon nitride, which demonstrates its potential for stable and sustainable energy production.
Graphical Abstract
Electrochemical water-splitting is not sparingly viable due to the slow anodic oxygen evolution reaction (OER). The need to engineer and fabricate electro-catalysts of low over-potential for water ...oxidation necessitates using readily available technologies and precursors. In the present study, OER electro-catalyst with composition neodymium telluride hollow shells vaporized on Ni Foam (NdTe-HS/NF) is fabricated at a substantially lower energy cost than other abundant metal-containing catalytic structures. The catalytic system functions properly, starting the oxygen evolution process at an over-potential of 301 mV vs. RHE, attaining a current density of 10 mA cm
−2
and a modest Tafel slope of 91 mV dec
−1
is also achieved. This tafel slope value suggests the presence of an electron/proton transfer channel. The catalyst sustains a constant current density over lengthy periods of up to 9 h of water electrolysis testing. Because of an easily accessible production technique, NdTe-HS/NF maintains its integrity, form, and chemical profile even after several hours of nonstop water electrolysis.
The family of halide perovskite materials is extremely large and has gained huge attention because of their low manufacturing cost and extraordinary structural, optical, electrical, and ...optoelectronic properties. These materials also deliver a pattern for designing new materials for energy conversion and energy storage applications. Here, we synthesized potassium cadmium chloride KCdCl
3
-based halide perovskite nanocomposites with rGO and fullerene-C60 by facile solvothermal method and studied their physical and electrochemical properties. The orthorhombic phase of KCdCl
3
was confirmed from XRD spectra, and the existence of constituent elements (K, Cd, Cl, and C) was confirmed from EDX analysis. SEM images evident the successful anchoring of KCdCl
3
particles over rGO and C60. BET results revealed the high surface area, pore radius, and pore volume of the KCdCl
3
/C60 electrodes. Furthermore, the electrochemical measurements demonstrated that KCdCl
3
/C60-based electrodes have a higher specific capacitance of 1135 F/g at 5 mV/s and cyclic stability (97.6% retention over 3000th cycles) than other grown electrodes. Also, GCD measurement results revealed that KCdCl
3
/C60 electrode has a high specific capacitance of 1420 F/g, an energy density of 2052 Wh/kg, and a power density of 4.19 W/kg at 1.0 A/g than other electrodes. Finally, intensive discussion proposed that halide perovskite nanocomposite electrodes can be used efficiently as supercapacitors electrode materials for future development in this field.
Graphical abstract
Electrochemical water splitting stands as a promising method for harnessing energy from renewable sources. However, substantial overpotential required for sluggish oxygen evolution reaction (OER) ...hampers its widespread adoption. In this study, a CuSe@PPy hybrid is being created by hydrothermally layering polypyrrole on top of CuSe. This hybrid electrocatalyst outperforms both pure CuSe and PPy in terms of OER efficiency. Structural and morphological analyses, including powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller (BET), confirm that the synthesized CuSe@PPy composite exhibits high crystallinity, nanostructured granular morphology, and a hexagonal structure with a large surface area. Evaluation of its electrocatalytic performance for water oxidation in a 1 M KOH alkaline medium reveals CuSe@PPy hybrid's exceptional durability, achieving 35 mA cm
−2
for 100 h. This durability is attributed to PPy coating on its surface, which facilitates efficient electron conduction. Coupling of PPy with CuSe leads to reduced overpotential (248 mV), a lower Tafel slope (30 mV/dec), and decreased charge transfer resistance (2.16 Ω), enhancing OER efficiency. By modifying surface of CuSe with a conducting polymer like PPy, this study underscores potential for improving performance in various applications, including photoelectron-catalytic research and stabilizing material activity.
Water electrolysis is a propitious strategy to overcome the exceeding energy crisis by producing renewable and green hydrogen fuel. However, the practical application of this process is limited due ...to the inadequacy of earth-rich, economical, and efficient electrocatalysts for carrying out kinetically more sluggish oxygen evolution reactions (OER). In the present research, a simple sol–gel method was employed to produce Co
3
O
4
/Pr
2
O
3
nanocomposite material, which provides exceptional electrical conductivity and lesser charge transfer resistance of mixed-valence cations. The fabricated nanomaterials were analyzed using various scientific techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and energy dispersive X-ray spectroscopy (EDX) to determine their crystal structure, morphology, elemental composition, and oxidation states. To investigate the water oxidation capability and steadiness of the modified Co
3
O
4
/Pr
2
O
3
electrode material in alkaline conditions, cyclic voltammetry (CV), linear sweep voltammetry (LSV), and constant current chronoamperometry (CA) were utilized. These outcomes revealed that the resultant nanocomposite exhibits a minimal overpotential around 257 mV and a lower Tafel slope around 78 mVdec
−1
at a benchmark current density of 10 mAcm
−2
. In addition, the alkaline solution reliability of the electrocatalysts was examined and confirmed to be steady for 24 h via chronoamperometry. The extraordinary electrocatalytic achievement of Co
3
O
4
/Pr
2
O
3
is ascribed to its structural synergistic effect, which encourages the oxygen evolution activity.
The discovery of highly active and cost-effective materials capable of catalyzing the oxygen evolution reaction (OER) is essential for water splitting. In the present study, we developed a new method ...for producing the structural components of advanced non-precious metal electrocatalysts NiS/CeS nanocomposite supported on stainless steel strip (SSS) represented as NiS/CeS/SSS that are both innovative and practical. To accomplish a current density of 10 mA cm
−2
, the NiS/CeS/SSS requires OER overpotential of 289 mV, which is smaller than the pure NiS/SSS (319 mV) and CeS/SSS (309 mV), and with enhanced stability of 40 h tested in 1.0 M KOH electrolyte. The higher efficiency of OER is due to the strong electrical contacts between NiS/SSS and CeS/SSS, the availability of active centers, and also the lower charge transfer resistance.
Metal sulfide and oxides have drawn interest as economical substitutes to noble metal catalysts due to their ability for oxygen evolution reaction (OER) activities. The inability of many sulfides and ...oxide nanocomposite materials has been produced in recent years to significantly boost their low OER activity. In the current study, we fabricated a novel lanthanum sulfide (La
2
S
3
) nanocrystal decorated on zirconium dioxide (ZrO
2
) nanoflakes for OER electrocatalyst. The composite attains a low overpotential of 280 mV at a current density of 10 mA/cm
2
and outstanding stability of 30 h. The increased catalytic activity of the Zr-O–O superoxo group is responsible for the transfer of electron tendency from La species to ZrO
2
, which favors the rupture of the bond of Zr–O in the steady arrangement. Hence, the present work developed an efficient La
2
S
3
-decorated ZrO
2
-based oxygen evolution electrocatalyst instead of using rare earth viable catalysts like ruthenium oxide (RuO
2
) or iridium oxide (IrO
2
).
Graphical abstract
Increasing energy demands and environmental degradation, have led to augmented demand for the production of cleaner energy. For this purpose, transition metal sulfides along with graphene-based ...materials have gathered attention as electrode materials for supercapacitor. Herein, manganese-doped chromium sulfide with reduced graphene oxide (Mn-doped Cr
2
S
3
/rGO) is synthesized by hydrothermal process as auspicious electrode material due to large specific capacitance, rapid charging and discharging rates, larger energy density and additionally their easy preparatory method, less cost and earth rich resources. Mn-doped Cr
2
S
3
/rGO nanocomposite exhibits superb specific capacity of 886.7 F g
−1
at 5 mV s
−1
sweep rate in 1 M KOH electrolyte with outstanding 121.91 Wh kg
−1
energy density, as well as 1040 W kg
–1
power density. It determines longer cyclic stability having capacitance retention (99.4%) compared to initial capacitance after 3000 cycles.
Graphical abstract
Three Electrode System
Manganese ferrite offers several advantages when employed as an electrocatalytic material for supercapacitors, including outstanding cycle stability and energy capacity. When compared to ...identical-metal sulfides, specific capacitance (C
sp
) of MnFe
2
O
4
remains inadequate. So, using the hydrothermal synthesis technique, partial sulfur doping of MnFe
2
O
4
was achieved to investigate the synergetic effect of oxides and sulfides. Various spectroscopic and microscopic studies demonstrate that adding sulfur atoms into MnFe
2
O
4
increases the lattice parameters, which improves electrochemical performance. At a current density around 2 A g
−1
, then calculating MnFe
2
O
4
with partial sulfur doping has a C
sp
of 1,201.60 F g
−1
, that is greater than 784.0 F g
−1
of pure MnFe
2
O
4
. Maximum energy density (E
d
) of 93.62 Wh kg
−1
was produced with a power density (P
d
) of 749 W kg
−1
. The current study depicts that partial sulfur doping can enhance the electrochemical behavior of MnFe
2
O
4
. As a result, the present work shows more effective in field of energy storage by enhancing their poor electrochemical performance.
