The role of oxygen defects in metal oxides for CO₂ reduction

Abstract

The abuse of fossil fuels releases a large amount of CO2, causesing global warming intensified. Using photoreduction and electroreduction to convert CO2 into high valuable fuels like Co, CH4 and...

Electrocatalytic CO2 reduction: role of the cross-talk at nano-carbon interfaces

“…The MO x phase is instrumental considering a combination of beneficial effects to enhance CO 2 RR, namely: (i) promoting CO 2 adsorption at the porous nano-oxide architecture, can increase its concentration at active sites and accelerate its conversion; (ii) facilitated mass transport and gaseous product desorption at tailored metal-oxide surfaces can be a winning strategy to tune kinetics, tandem reactions and the selectivity outcome; (iii) the control of the local pH by buffering the acidity/basicity conditions after the electrocatalytic event can suppress competitive HER; (iv) control of the redox sites dynamics and oxygen vacancies at the interface will impact the CO 2 activation modes and the stabilization of reduction intermediates. 91 In this light, the fabrication of a triple electrocatalytic interface by integrating the M/MO x motif with the CNS surface is pivotal to mitigate the conductivity-loss ascribed to the insulating oxide phase while mediating interfacial ET to regulate the MO x redox behavior and to shuttle electrons at the active metal sites. 38 While several examples showcase the prominent appeal of core-shell M/MO x interfaces for CO 2 RR, 92 their combination with CNS surfaces is still underexplored.…”

Engineering one-dimensional hollow beta-In2S3/In2O3 hexagonal micro-tubes for efficient broadband-light photocatalytic performance

“…[15][16][17] Unfortunately, the low visiblelight absorption and the high recombination rate of photogenerated electron and hole pairs are two critical drawbacks that hinder the improvement of the photocatalytic activity of semiconductors nowadays. [18][19][20] Selecting a semiconductor with an appropriate bandgap for absorption of broadband-light plays an important role in enhancing the light utilization. In 2 S 3 with a moderate bandgap (2.0-2.2 eV) showing an outstanding absorption coefficient is an excellent candidate.…”

Anharmonicity induced faster decay of hot phonons in rutile TiO2 nanorods: a Raman spectromicroscopy study

“…Though each of these polymorphs exhibit distinct properties, but rutile phase is the thermodynamically preferred 22 form at all temperatures. Like its bulk form, nanostructured rutile TiO 2 is also important because it exhibits advantageous properties [23][24][25] compared to anatase including higher absorption in the visible light, and better chemical stability [26][27][28] making it suitable for numerous applications [29][30][31] . Looking at its technological importance, basic properties of this phase has also been explored 32 .…”