Water splitting by a pentanuclear iron complex

Design of molecular water oxidation catalysts with earth-abundant metal ions

“…The TON estimated from the CPE results was approximately 1 000 000 to 10 000 000 for 120 min based on the assumption that the thickness of the reaction-diffusion layer adjacent to the electrode surface (m) is of the order of m % ffiffiffiffiffiffiffiffiffiffiffiffiffi ffi D=k cat p , 190 where D (cm 2 s À1 ) is the diffusion coefficient of the catalyst. Similar to other molecular catalysts based on earthabundant first-row transition metal ions, the decomposition of the pentairon catalyst during the catalysis is also discussed in this system, 191,192 although the results of several measurements including electrochemical study, UV-vis absorption spectroscopy and XPS fully evidenced the stability of the complex and no formation of heterogeneous catalytic active species under our experimental condition. 193 The catalytic cycle for 89 was proposed based on the results of electrochemical and spectroelectrochemical measurements, 57 Fe Mo ¨ssbauer spectroscopy, and quantum chemical calculations (Fig.…”

Snowflake-like Cu2S Coated with NiAl-LDH Forms a p–n Heterojunction for Efficient Photocatalytic Hydrogen Evolution

“…Therefore, looking for alternatives to fossil fuel energy is the main problem that people face at present. Hydrogen energy is undoubtedly an environmentally friendly energy sources, and solar energy water splitting to produce hydrogen energy is a new and promising way to produce hydrogen. − Under the irradiation of the sunlight, water molecules are stimulated by a photocatalyst to form hydrogen and oxygen, which effectively convert solar energy into hydrogen. − However, there are also many problems that need to be further studied in the field of photocatalysis, such as how to solve the recombination of electron–hole pairs, the photocorrosion of photocatalysts, and so forth. Therefore, it is necessary to develop a stable and efficient photocatalyst.…”

Multireversible Redox Processes in a Self‐Assembled Nickel Pentanuclear Bis(Triple‐stranded Helicate): Structural and Spectroscopic Characterizations in the NiII5 and NiINiII4 Redox States

“…In fact, the iron derivative [{Fe II ( μ ‐bpp) 3 }Fe II 3 ( μ 3 ‐O)] 2+ has been proposed by the group of Masaoka to be an active catalyst for the electrocatalytic water oxidation thanks to its ability to accumulate four oxidative equivalents, the four‐electron oxidized species, Fe III 5 , being reactive with H 2 O to generate O 2 [55–58] . The molecular nature of the active catalytic species has been however recently questioned [59–60] . More recently, the same group also shown that the cobalt derivative, [{Co II ( μ ‐bpp) 3 }Co II 3 ( μ 3 ‐OH)] 3+ , upon reduction, can act as a catalyst for CO 2 reduction into CO [53] .…”