A New Si/TiO2/Pt p-n Junction Semiconductor to Demonstrate Photoelectrochemical CO2 Conversion

Abstract

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CO2 Reduction of Hybrid Cu2O–Cu/Gas Diffusion Layer Electrodes and their Integration in a Cu‐based Photoelectrocatalytic Cell

“…A drastic increase in faradaic selectivity of one order‐of‐magnitude for both formate and acetate is observed, with total carbon selectivity above 95 %. Even if acetate has been considered deriving from further reactions through coupling processes from the formed species with one carbon atom, the trends observed in Figure do not indicate a consecutive, but a parallel path for the two products. The hydrogen production reaches the higher amount in the first 1 h of CO 2 electroreduction, decreasing with time.…”

“…Ad rastic increase in faradaic selectivity of one order-of-magnitude for both formate and acetate is observed, with total carbon selectivity above 95 %. Even if acetate has been considered deriving from furtherr eactions throughc oupling processes from the formed species with one carbon atom, [63][64][65] the trendso bservedi nF igure 4d on ot indicate ac onsecutive, but ap arallel path for the two products.T he hydrogen production reaches the highera mount in the first 1hof CO 2 electroreduction,d ecreasingw ith time. Note that in the first hour,h owever,t here is not an increase in the rate, but an apparent effect relatedt o the accumulation of the H 2 in the empty volumeo ft he gas phase system of the electrocatalytic reactor.B eing this side reaction of H 2 formation mainly due to the GDL itself, as commented before,i ti sr easonable to indicate that the active sites responsible of this side reaction are progressively inhibited, www.chemsuschem.org likely by CO 2 strong chemisorption.…”

An Artificial Photosynthesis System Based on Ti/TiO2 Coated with Cu(II) Aspirinate Complex for CO2 Reduction to Methanol

“…A photoelectrochemical reactor with two compartments interconnected by a single porous glass plate at a temperature of 25°C controlled by a thermostatic bath (Quimis, Brazil) was used to promote the reduction of CO 2 [31]. In the cathodic compartment, the TiO 2 nanotubes (NTs) bare and modified with copper aspirinate used as working electrode along with a reference electrode Ag/AgCl in KCl 3 mol L −1 were placed at a distance of 5 cm from a quartz tube containing a mercury lamp of 125 W high pressure.…”

Semiconductor‐Based Photoelectrochemical Conversion of Carbon Dioxide: Stepping Towards Artificial Photosynthesis

“…AS i/TiO 2 /Pt p-n junctionw as reported to show good performance for methanol( 0.88 mmol L À1 ), ethanol (2.60 mmol L À1 ), and acetone (0.049 mmol L À1 )f ormationa s products in 90 min, with FE = 96 %a tÀ0.8 Vv ersus Ag/AgCl. [39] Additionally,b ecause the HER proceeds under fierce competition over unmodified silicon or poorly covered silicon, decoration with appropriate metals or organic groups as cocatalysts are expected to improvet he reaction (details are given in Section 3.2).…”