Highly Efficient Photocatalytic System Constructed from CoP/Carbon Nanotubes or Graphene for Visible‐Light‐Driven CO₂ Reduction

Abstract

Visible-light-driven conversion of CO to CO and high-value-added carbon products is a promising strategy for mitigating CO emissions and reserving solar energy in chemical form. We report an efficient system for CO transformation to CO catalyzed by bare CoP, hybrid CoP/carbon nanotubes (CNTs), and CoP/reduced graphene oxide (rGO) in mixed aqueous solutions containing a Ru-based photosensitizer, under visible-light irradiation. The in situ prepared hybrid catalysts CoP/CNT and CoP/rGO show excellent catalytic activities in CO reduction to CO, with a catalytic rates of up to 39 510 and 47 330 μmol h g in the first 2 h of reaction, respectively; a high CO selectivity of 73.1 % for the former was achieved in parallel competing reactions in the photoreduction of CO and H O. A combination of experimental and computational studies clearly shows that strong interactions between CoP and carbon-supported materials and partially adsorbed H O molecules on the catalyst surface significantly improve CO-generating rates.

Sharp‐Tipped Zinc Nanowires as an Efficient Electrocatalyst for Carbon Dioxide Reduction

“…Converting carbon dioxide (CO 2 ) into carbon‐containing products by facile electrochemical methods is regarded as a desirable way to decrease the greenhouse gas that triggers ever growing climate change . Unfortunately, CO 2 molecules are inert and stable, requiring efficient electrocatalysts to activate the kinetically sluggish CO 2 reduction reaction (CO 2 RR) . Although copper can act as an active electrocatalyst for CO 2 RR, its poor selectivity for carbon‐containing products proves more challenging upon separation and purification .…”

“…[1][2][3] Unfortunately,C O 2 molecules are inert and stable, requiring efficient electrocatalysts to activate the kinetically sluggish CO 2 reduction reaction (CO 2 RR). [4][5][6] Althoughc opper can act as an active electrocatalyst for CO 2 RR, its poor selectivity for carbon-containing products provesmore challenging upon separation and purification. [7][8][9] It is crucial to identify catalysts with high selectivity for the sole product, such as the gas-phase CO that can be directly used in syngas.…”

An Exceptionally Efficient Co−Co2P@N, P‐Codoped Carbon Hybrid Catalyst for Visible Light‐Driven CO2‐to‐CO Conversion

“…The photocatalytic rates for both reduction of H 2 Oa nd CO 2 gradually decreaseda st he water content was increased further,i ndicating that partially adsorbed H 2 Om olecules on the surface of the hybrid catalyste nhanced the adsorption and transformation of CO 2 ,a nd facilitated the important kinetic step of proton transfer during CO 2 photoreduction. [22,25] Strongi nteractions between H 2 Om olecules anda toms on the catalyst surface are beneficial for proton transfer to form intermediate OCOH*o ra ccept an electron to generate H 2 ,w hich accelerates the CO-and H 2 -generating reactions. However,a ddition of excess water caused ad ecrease in the number of active catalytic sites because of the catalyst surface covered by H 2 O, decelerating the key kinetic step of the proton transfer.…”

“…Recently, cobalt nanoparticles (NPs) and cobalt‐based phosphides have drawn considerable attention as cocatalysts or catalysts for splitting water into hydrogen and oxygen and hydrolysis of ammonia borane . However, the use of these materials to achieve CO 2 photocatalytic reduction has seldom been reported . We expect that synergistic effects of cobalt and phosphides as well as the interactions of the nanoparticles with carbon nanosheets can improve the catalytic performance of photoreduction CO 2 .…”

“…[21] However,t he use of these materials to achieve CO 2 photocatalytic reduction has seldom been reported. [22] We expect that synergistic effects of cobalt and phosphides as well as the interactions of the nanoparticles with carbon nanosheets can improve the catalytic performance of photoreduction CO 2 .I nt his work, we develop ao ne-pot methodt os ynthesize as eries of new mesoporousm aterials with large surface area;n amely,C oa nd Co 2 PN Ps embedded on N, P-codoped graphitic carbon nanosheets. The combination of this materiala sacatalyst with aR u II molecular photosensitizer displaysh ighly photocatalytic activity for CO 2 photoreduction (Table S1 in the Supporting Information).…”