Investigation of schreibersite and intrinsic oxidation products from Sikhote-Alin, Seymchan, and Odessa meteorites and Fe3P and Fe2NiP synthetic surrogates

The evolution of the surface of the mineral schreibersite in prebiotic chemistry

“…9 mineral using XRD, microprobe, Raman, 15 and XPS all demonstrate strong similarity between this material and meteoritic schreibersite, with respect to crystal structure, composition, and redox state of elements. The densest schreibersite was made when the product was heated to the melting point after 235 hours.…”

“…3a), consistent with a reduced oxidation state on P, like meteoritic schreibersite. 15 The peak at 132-134 eV was also observed in synthetic iron phosphide, 14 and meteoritic schreibersite, 15 where it was attributed to a thin layer of oxide formed by reaction with air. The binding energies of Ni and Fe (852 eV and 706.6 eV, respectively) shows these materials remain in their elemental state.…”

“…15,22 Solutional chemistry would require a reactive solute to phosphorylate an organic. Such a solute might be trimetaphosphate, 5 which can be synthesized from schreibersite albeit in very small concentrations via oxidation.…”

“…Prior works examining the surface of natural schreibersite minerals have demonstrated a thin coating of oxides/phosphates consistent with an oxidized surface. 14,15,24 However, these analyses were performed on samples that had been exposed to the atmosphere for several years, and hence, likely reacted with atmospheric O 2 to produce the oxide coating. Based on the presence of detrital reduced minerals (minerals that would not have survived on the earth's surface after atmospheric oxygenation) and ferrous iron in rocks on the early earth, 25 the atmospheric concentration of O 2 was low prior to the oxygenation of the atmosphere.…”

Free‐Sustaining Three‐Dimensional S235 Steel‐Based Porous Electrocatalyst for Highly Efficient and Durable Oxygen Evolution

“…The peak that corresponds to Fe 2 Pi ss ignificantly reduced relative to that of the catalystp rior to the polarization experiments,w hich suggestst hat an ew active ironbased species is generated duringt he OERp rocess. As shown in Figure S5, bands situated at 262 and 509 cm À1 and the strong bands at 715 and 377 cm À1 can be indexed to a-FeOOH, b-FeOOH, and g-FeOOH, [83,84] and the weak bands at 301, 530, 661, and 388 cm À1 are causedb yF e 3 O 4 and a-Fe 2 O 3 ; [85,86] only as mall band at 488 cm À1 pertainingt oF e 3 P [87] can be found, which confirms the formation and coexistence of M 2 O 3 ,M 3 O 4 ,a nd M(O)OH( M= Fe, Mn) during the OER process. The contact conditions between the catalyst and electrolyte are ac ritical factor affecting the catalytic performance.…”