Superior overall water splitting performance in polypyrrole photoelectrode by couplingNrGOand modifying electropolymerization substrate

Abstract

We prepare photoelectrodes with mixed metal oxides (TiO 2-RuO 2), polypyrrole (PPy) and N-doped reduced graphene oxide (NrGO) on titanium (Ti) substrate for overall water splitting and methylene blue degradation during two steps; including a sol-gel deposition of mixed metal oxide (MMO) and electrodeposition of PPy or PPy-NrGO films. The as-prepared photoelectrodes are characterized by physical and photoelectrochemical measurements. Ti/MMO/ PPy-NrGO photoelectrode exhibit a considerably photocurrent density of −6.97 mA cm −2 (at 0 V vs. reversible hydrogen electrode [RHE]) and 12.89 mA cm −2 (at 1.23 V vs. RHE) for hydrogen and oxygen generations, respectively. However, promotion in the H + /H 2 efficiency (40.25%) is about 28 orders of magnitude while in the case of H 2 O/O 2 (13.77%) is 10 times. The electrochemical impedance spectroscopy and Mott-Schottky measurements reveal that the simultaneous incorporation of MMO and NrGO nanosheets in PPy coating leads to the lowest charge transfer resistance at the photoelectrode/ electrolyte interface and an improvement in charge carrier density.

Doping of W Ions to Modulate the Polarization Intensity of Bi2WO6 for Efficient Piezoelectric–Photoelechochemical Water Splitting

“…The energy crisis and environmental pollution caused by the rapid development of industry are becoming increasingly serious. − In order to solve the above problems, hydrogen energy is considered as an ideal fuel to meet the global energy demand under environment-friendly conditions. − In recent years, energy experts have developed many technologies for hydrogen production by water splitting. , Among many hydrogen production technologies, PEC water splitting technology, which can convert solar energy into chemical energy, is considered to be an ideal hydrogen production method to meet the demand of hydrogen energy in the future. − …”