One-spot autogenous formation of crystalline-amorphous Ni3S2/NiFeO Hy heterostructure nanosheets array for synergistically boosted oxygen evolution reaction

FeCoCuMnRuB Nanobox with Dual Driving of High-Entropy and Electron-Trap Effects as the Efficient Electrocatalyst for Water Oxidation

“…As manifested by Figures and S20, metallic states vanished after OER tests, leaving only oxidized species. The binding energies of Fe, Co, and Mn (Figure a–c) display the positive shift to different degree, with a predominance of higher valence state, denoting the formation of MOOH species. ,, Notably, as displayed in Figures f and S21, Cu and B elements in FeCoCuMnRuB are slightly etched after OER due to the solubility of [Cu­(OH) 4 ] 2– ion and BO 3 group (Table S5), similar to the experimental phenomenon reported in literature . To eliminate the possibility that B atoms adsorb on the surface in the form of the BO 3 group, 0.1 M NaNO 3 was used in anion exchange experiments, followed by inductively coupled plasma mass spectrometry (ICP-MS) detection.…”

“…This short-range ordering endows them unique structural characteristics such as isotropic atomic environment . Thus, HEMs offer unlimited possibilities for component regulation and performance optimization. − However, the precise regulation of size and morphology at the atomic level remains a formidable challenge in high-entropy materials due to variations in nucleation/growth dynamics among different elements.…”

“…and S20, metallic states vanished after OER tests, leaving only oxidized species. The binding energies of Fe, Co, and Mn (Figure3a−c) display the positive shift to different degree, with a predominance of higher valence state, denoting the formation of MOOH species 19,27,…”

One-step hydrothermal synthesis of a Ni3S2–FeMoO4 nanowire–nanosheet heterostructure array for synergistically boosted oxygen evolution reaction

“…3f (inset). 32 Thus the 3D self-supported nanowire–nanosheet architectural morphology endows the obtained electrode with abundant exposed active sites, rapid bubbles release, and timely electrolyte diffusion.…”

In situ assembly of Ni3S2 nanosheets encapsulated with NiFe(oxy)hydroxides for efficient water oxidation

“…Regardless of which interfacial structure is present, the nearly metallic conductivity of Ni 3 S 2 always plays a key role in facilitating the electron transfer of the catalyst. 25–28 Herein, nanosheeted Ni 3 S 2 was prepared on Ni foam (NF) as the supporting material for in situ generation of an ultrathin NiFe(OH) x catalytic layer on the surface to form a core–shell structure via an ingenious chemical nanoengineering technology. In alkaline electrolyte, the well-designed NiFe(OH) x /Ni 3 S 2 /NF electrode exhibited outstanding electrocatalytic performance in the OER, driving a current density of 100 mA cm −2 at an overpotential of only 218 mV, with a Tafel slope of 37.9 mV dec −1 and an amazing durability of at least 12 days continuous working time.…”