Heterostructures for superactive hydrogen evolution electrocatalysis
A heterogeneous structure, electrocatalyst technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of high activity and stability difficulties
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Embodiment 1
[0077] Nanoscale NiO / Ni heterostructures for superactive hydrogen evolution electrocatalysis
[0078] review : Active, stable, and cost-effective electrocatalyst pairs for H by electrolysis or photoelectrochemistry2 Produced water splitting is desired. Herein, this example addresses the development of nanoscale NiO / Ni heterostructures formed on the sidewalls of carbon nanotubes (CNTs) as highly efficient electrocatalysts for HER with activity comparable to platinum. . Partially reduced Ni bonded to NiO is formed by Ni(OH) bound to the CNT sidewall 2 Caused by low-pressure thermal decomposition of precursors. Ni 2+ The -CNT interaction hinders complete reduction and Ostwald ripening of the Ni species to a less HER active pure Ni phase. Further doping of Ni(OH) with Cr 2 / ox-CNT precursors formed from small CrO x Ternary structure of nanoparticle-coated NiO / Ni core, which significantly enhances HER catalyst stability through constrained particle growth and phase separati...
Embodiment 2
[0115] Cr 2 o 3 Incorporation of NiO-Ni electrocatalysts for superior water splitting
[0116] review : Emerging H 2 There is an economic need for active and durable electrocatalysts based on low-cost, earth-abundant materials for water electrolysis or photolysis. Here, this example reports the synthesis of Cr-doped 2 o 3 NiO layer coated (over-coated) nanoscale Ni metal core. Ni@NiO / Cr 2 o 3 The three-phase material exhibits superior activity and stability similar to Pt for HER electrocatalysis in alkaline solution. Chemically stable Cr 2 o 3 Serves to prevent oxidation of the Ni core, maintains the abundant NiO / Ni interface as catalytically active sites in the heterostructure and thus imparts high stability to the hydrogen evolution catalyst. The efficient and stable electrocatalyst provides a 2 Alkaline electrolyzers operating under conditions that last longer than 3 weeks without significant decay. For light-driven water splitting using GaAs solar cells, non-...
Embodiment 3
[0149] Ni@Cr 2 o 3 -Synthesis of NiO catalyst
[0150] In a typical synthesis, approximately 0.2M nickel acetate (Ni(OAc) 2 ) and about 0.5M chromium nitrate (Cr(NO 3 ) 3 ) aqueous solution is mixed (Ni(OAc) 2 with Cr(NO 3 ) 3 The volume ratio is about 40:1). The resulting mixture was allowed to stand for at least about 30 minutes and then stirred vigorously to form a homogeneous suspension. The Ni foam was soaked in the suspension and dried at about 120°C. This process was repeated until all the suspension was used. Before each soaking process, the Ni foam was pre-rinsed with ethanol. The coated Ni foam was annealed in a tube furnace at about 300° C. for about 1 hour under about 100 seem Ar flow to maintain a pressure of about 1.5 Torr. The system is pumped continuously during the reaction.
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