Two
new organoamine templated one-dimensional transition metal
phosphonate compounds are synthesized, and their bifunctional electrocatalytic
activities are examined in highly alkaline and acidic media. Compared
with state-of-the-art materials, the cobalt phosphonate system is
a new fabrication of sustainable and highly efficient catalysts toward
electrochemical water splitting systems.
Widespread contemporary attention has grown over the years in the search for a new functional and robust inorganic framework system with the advent of exciting applications. Herein, a facile strategy has been demonstrated for developing noble-metal-free bifunctional electrocatalysts by successfully preparing a polyoxovanadoborate framework compound, i.e., [Na 10 (H 2 O) 18 ][(VO) 12 (μ 3 -OH) 6 -(B 3 O 7 ) 6 ]•5H 2 O, i.e., NVBO-I. Anionic vanadoborate clusters are interconnected through a cationic sodium aquated chain to form a three-dimensional framework structure. The compound exhibits remarkable bifunctional activity for oxygen and hydrogen evolution reactions over many well-engineered and state-of-art electrocatalysts under a similar catalytic environment.
Altering the morphology of electrochemically
active nanostructured
materials could fundamentally influence their subsequent catalytic
as well as oxygen evolution reaction (OER) performance. Enhanced OER
activity for mixed-metal spinel-type sulfide (CuCo2S4) nanorods is generally done by blending the material that
has high conductive supports together with those having a high surface
volume ratio, for example, graphitic carbon nitrides (g-C3N4). Here, we report a noble-metal-free CuCo2S4 nanorod-based electrocatalyst appropriate for basic
OER and neutral media, through a simple one-step thermal decomposition
approach from its molecular precursors pyrrolidine dithiocarbamate-copper(II),
Cu[PDTC]2, and pyrrolidine dithiocarbamate-cobalt(II),
Co[PDTC]2 complexes. Transmission electron microscopy (TEM)
images as well as X-ray diffraction (XRD) patterns suggest that as-synthesized
CuCo2S4 nanorods are highly crystalline in nature
and are connected on the g-C3N4 support. Attenuated
total reflectance–Fourier-transform infrared (ATR-FTIR), X-ray
photoelectron spectroscopy (XPS), and Raman spectroscopy studies affirm
the successful formation of bonds that bridge (Co–N/S–C)
at the interface of CuCo2S4 nanorods and g-C3N4. The kinetics of the reaction are expedited,
as these bridging bonds function as an electron transport chain, empowering
OER electrocatalytically under a low overpotential (242 mV) of a current
density at 10 mA cm–2 under basic conditions, resulting
in very high durability. Moreover, CuCo2S4/g-C3N4 composite nanorods exhibit a high catalytic
activity of OER under a neutral medium at an overpotential of 406
mV and a current density of 10 mA cm–2.
We have prepared a graphitic carbon nitride (g-C 3 N 4 ) composite with MoO 3decorated Co 3 O 4 nanorods (Co 3 O 4 /MoO 3 /g-C 3 N 4 ) via the hydrothermal approach, and this hybrid material acts as a highly active and durable electrocatalyst for water splitting reactions. This material could fundamentally influence the catalytic processes and performance of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The OER and HER activities of Co 3 O 4 -/MoO 3 -based nanorods are enhanced by blending with conducting support, for example, graphitic carbon nitrides (g-C 3 N 4 ). The X-ray diffraction pattern and the attenuated total reflectance-Fourier transform infrared data revealed that the as-synthesized nanorods are highly crystalline in nature and are attached to the g-C 3 N 4 support. Transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy studies also affirm the successful heterointerface formation between Co 3 O 4 /MoO 3 nanorods and g-C 3 N 4 . This Co 3 O 4 /MoO 3 /g-C 3 N 4 rodshaped catalyst is highly stable in comparison to its individual constituent and generates a current density of 10 mA cm −2 at a low overpotential of 206 mV for OER and 125 mV for HER in alkaline and acidic media, respectively. This work could pave the way for developing Co 3 O 4 /MoO 3 /g-C 3 N 4 composite materials as electrocatalysts for overall water splitting reactions. KEYWORDS: Co 3 O 4 /MoO 3 /g-C 3 N 4 , decorated, nanorods, composite, water splitting, OER, HER
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