Tuning the reactivity of cobalt-based H2 production electrocatalysts via the incorporation of the peripheral basic functionalities

Replacing Pyridine with Pyrazine in Molecular Cobalt Catalysts: Effects on Electrochemical Properties and Aqueous H2 Generation

“…Therefore, we proposed that the excellent activity stems from a proton reduction mechanism that proceeds through intramolecular electron and proton transfer steps between the metal center and ligand framework to distribute the two electrons and two proton transfers required to generate H 2 from aqueous protons. This aligns with work from several other groups that have similarly demonstrated that the integration of basic groups into the chemical structure of proton and CO 2 reduction catalysts leads to the ability to bind protons from solution and participate in proton transfer to and from the metal center [22,32].…”

“…In transformations that are more demanding than proton reduction, such as CO 2 reduction, the addition of amine groups around the periphery of a tetraazine Co(II) macrocycle provides sites to generate an H-bonding network with a solvent and CO 2 [19,20]. These examples, and many others, illustrate how even subtle changes in molecular structure can have a profound impact on catalytic activity [21,22].…”

Acceptorless Photocatalytic Dehydrogenation of Furfuryl Alcohol (FOL) to Furfural (FAL) and Furoic Acid (FA) over Ti3C2Tx/CdS under Visible Light

“…[38][39][40] Different cocatalysts, including metals nanoparticles, transition metal chalcogenides and molecular cocatalysts, which act as catalytic active sites for hydrogen evolution and to suppress the recombination of the photogenerated charge carriers, have been deposited on CdS to promote the photocatalytic activity for hydrogen evolution over CdS. [41][42][43][44][45][46][47] As a new type of two-dimensional (2D) transition metal carbide, Ti 3 C 2 T x MXene (T =À OH, À O and À F) was previously reported to be active for electrochemical hydrogen evolution. [48][49][50][51][52] The use of MXene as efficient cocatalyst for semiconductor-based photocatalytic hydrogen evolution have also been demonstrated.…”

“…2.4 eV) corresponding well to the visible light absorption, CdS has demonstrated promising activity for photocatalytic hydrogen evolution from water containing sacrificial reagents under visible light [38–40] . Different cocatalysts, including metals nanoparticles, transition metal chalcogenides and molecular cocatalysts, which act as catalytic active sites for hydrogen evolution and to suppress the recombination of the photo‐generated charge carriers, have been deposited on CdS to promote the photocatalytic activity for hydrogen evolution over CdS [41–47] . As a new type of two‐dimensional (2D) transition metal carbide, Ti 3 C 2 T x MXene (T=−OH, −O and −F) was previously reported to be active for electrochemical hydrogen evolution [48–52] .…”

Photocatalytic hydrogen production of porphyrin nanostructures: spheres vs. fibrils, a case study

“…Molecular hydrogen is considered as one of the most suitable solar fuels due to its high energy capacity and being environmental friendly. 7 In contrast to hydrocarbons, the combustion of H 2 produces only H 2 O as a by-product and can be utilized in any current natural gas system. [8][9][10] More importantly, the energy stored in H 2 can be efficiently converted into electricity using fuel cells.…”