We report direct overall pure water splitting by visible light excited graphitic carbon nitride incorporated with conjugated aromatic rings without using sacrificial agents.
The hydrogenolysis of sorbitol into 1,2-propanediol (PD), ethylene glycol (EG) and glycerol (G) was investigated over Ni, Pt and Ru supported on NaY at 220°C and 60 bar in a batch reactor. Ni(6 %)-NaY was investigated in detail at different process conditions, including its recyclability. Attempts have been made to rationalize the experimentally observed conversion and product selectivity obtained over the different catalysts with results of Density Functional Theory calculations of adsorption energy and bond length changes in sorbitol adsorbed over various planes of Ni, Pt and Ru.
Developing
nonprecious metal-based electrocatalysts to convert
water into green fuels (H2 and O2) is key to
address urgent climate and energy challenges. We have prepared an
electrocatalyst by the immobilization of NiCo2O4 on a phosphazene-based covalent organic polymer (P-COP) through
a facile hydrothermal method. The elemental composition of the P-COP
showed the presence of a greater amount of heteroatoms N (6.62%) and
P (5.62%) throughout the polymer support. Scanning transmission electron
microscopy (STEM) and electron energy loss spectroscopy (EELS) were
utilized to determine the atomic structure of the nanocuboids, which
depicted the formation of an inverse spinel structure. A NiCo2O4-P-COP-based electrode was simultaneously used
for the oxygen evolution reaction (OER) and hydrogen evolution reaction
(HER), and it displayed a minimum overpotential of 270 and 130 mV
(V vs RHE), respectively, at a current density of 10 mA cm–2. In addition, it acted as an oxygen reduction catalyst with a half-wave
potential of 0.83 V (V vs RHE) and a maximum current density of 4.5
mA cm–2. The electrocatalytic activity is comparable
with that of the commercially available Pt and RuO2 catalysts.
The combined experimental and computational studies confirm that the
catalytic centers formed through the interaction between the heteroatoms
(N and P) in the phosphazene matrix and metal oxides (Co and Ni) play
an important role in its improved durability and electrocatalytic
activity.
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