Photochemical solar collector for the photoassisted reduction of aqueous carbon dioxide

Catalytic Generation of Hydrogen from Formic acid and its Derivatives: Useful Hydrogen Storage Materials

“…Later on, a system for solar energy conversion by reduction of aqueous carbonate was proposed by Halmann in 1983 [33]. In 1986, a similar concept was described by Wiener et al They proposed a Pd/C catalyst to decompose aqueous formate solutions to obtain hydrogen [34][35][36].…”

“…As a current state of the art catalyst system an iridium PNPpincer catalyst has been developed, which reached activities up to a turnover frequency (TOF) of 150,000 per hour and an overall turnover number (TON) of 3,500,000, respectively [46]. It has also been proposed that both electrochemical reduction and hydrogenation of CO 2 could rely on sunlight as a sustainable source of energy: Electricity may be obtained via photovoltaics, and hydrogen may then obtained by electrolysis [21,[32][33][34][35][36][37][38]. Alternatively, hydrogen may be obtained by direct photochemical water splitting in the future [3].…”

Recent advances in the photocatalytic reduction of carbon dioxide

“…And Fujishima et al (Inoue et al 1979) developed the reduction process of CO 2 using TiO 2 , CdS, GaP, ZnO and SiC powder as photocatalysts and proposed the reaction mechanism of CO 2 photoreduction. Subsequently, Halmann et al (1983) used SrTiO 3 as photocatalyst to reduce CO 2 solution and obtained HCOOH, HCHO and CH 3 OH.…”

Photocatalytic CO2 reduction with H2 as reductant over copper and indium co-doped TiO2 nanocatalysts in a monolith photoreactor

“…In 1979, Inoue et al [3] pioneered photocatalytic CO 2 reduction with H 2 O to chemicals and fuels using semiconductor materials such as TiO 2 , ZnO, WO 3 , SiC, CdS, and GaP. Soon after, CO 2 photoreduction using water as a reductant to various products such as CO, CH 4 , CH 3 OH, HCHO, and HCOOH attracted considerable interests [4][5][6][7][8][9][10]. However, H 2 O is a weak reductant and is hardly reducible, thus photoreduction of H 2 O to H 2 proceeds preferably through water splitting as compared to that of CO 2 .…”