A branch-like Mo-doped Ni₃S₂ nanoforest as a high-efficiency and durable catalyst for overall urea electrolysis

Abstract

A branch-like Mo-doped Ni3S2 nanoforest is presented as a robust electrocatalyst for boosted energy-saving H2 production through the overall urea electrolysis.

Construction of Fe‐doped NiS–NiS2 Heterostructured Microspheres Via Etching Prussian Blue Analogues for Efficient Water‐Urea Splitting

“…Differ from OER, UOR occurs preferentially at the anode based on the equation of CO(NH 2 ) 2 + 8 OH − → 6 H 2 O + N 2 + CO 3 2− + 6 e − in the electrolyte containing urea. [ 33 ] Herein, we chose 0.33 M urea as an example based on 1 M KOH solution, and the overpotentials, Tafel slopes, C dl , R ct along with stability toward UOR were systematically assessed for comparation. From Figure a, Fe‐doped NiS–NiS 2 merely requires a driving potential of 1.36 V (versus RHE) to reach 50 mA cm −2 , lower than that of Fe‐doped NiS 2 (1.37 V) and NiS–NiS 2 (1.39 V) and NiS 2 (1.41 V).…”

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

“…Therefore, compared to acidic or neutral UOR, alkaline UOR is more promising. For alkaline UOR, owing to the intrinsic higher activities, Ni-based catalysts (Ni-containing metals, 80–84 oxides, 85–90 hydroxides, 91–97 sulfides, 98–102 phosphides, 103–105 selenides, 106–108 nitrides, 109–113 etc. ) have been more widely investigated among all transition metal-based catalysts.…”

Less‐Energy Consumed Hydrogen Evolution Coupled with Electrocatalytic Removal of Ethanolamine Pollutant in Saline Water over Ni@Ni3S2/CNT Nano‐Heterostructured Electrocatalysts

“…[34,35] Additionally, numerous crystal defects are observed on Ni 3 S 2 shell, which are considered as edge active zones to promote the catalytic performance. [17,18,22,32] The global STEM image in dark field (Figure 1d) evi dently demonstrates the ultrahigh dispersibility of Ni@Ni 3 S 2 nanocrystals, due to which the quantity and density of exposed active sites can be considerably enhanced. HAADFSTEM image of Figure 1e presents the feature of core@shell structure, in which the brighter metal core is sharply observed.…”

“…), due to their remarkable electrochemical performance for water splitting and energy storage applications. [16,[21][22][23] Apart from the elemental composition of chemicalbased catalysts, struc tural engineering of optimal geometry have also demonstrated their contribution to further improving the electrocatalytic activity. [24][25][26][27][28] One of the most successful cases is the construc tion of core@shell (or yolk@shell) heterostructures with highly conductive metal cores, which possess outstanding interactions for swift carrier communications with the catalytic shell.…”