Cobalt sulphide microtube array as cathode in photoelectrochemical water splitting with photoanodes

Abstract

We report on a cobalt sulphide (CoS) electrode prepared by simple and scalable chemical bath deposition (CBD), which performs as a highly efficient and robust electrocatalyst for the H 2 evolution reaction (HER) in both neutral and pH 13 electrolyte solution at a small overpotential (η < 90 mV). At η = 390 mV, turnover frequencies of 38.8 ± 1.9 and 52.1 ± 2.0 mol H 2 (mol Co) -1 h -1 were achieved with high stability (Faradaic efficiency > 95% for at least 72 h) and turnover numbers of approximately 2,600 and 3,400 in neutral and basic electrolyte solution, respectively. The rate of 10 HER per geometric area is further enhanced by employing a CoS microtube array (microCoS), which is prepared by sulfurisation of a cobalt hydroxide carbonate nanorod array template using CBD. MicroCoS shows excellent HER activity when it is coupled with a nanostructured hematite (α-Fe 2 O 3 ) photoanode for H 2 generation from photoelectrochemical water splitting in basic electrolyte solution. 15 80 deposition (CBD) in an aqueous solution (10 mL) containing urea (50 mM), CoCl 2 ·6H 2 O (50 mM), and thioacetamide (0.1 M) at 90

High‐Energy‐Density Supercapacitors Based on Patronite/Single‐Walled Carbon Nanotubes/Reduced Graphene Oxide Hybrids

“…Compounds such as MoS 2 , [16][17][18] WS 2 , [19][20][21] CdSe, [22,23] NiS, [24,25] and CoS [26,27] have been the subject of intense research. Only recently, a new group of compounds belonging to this category has come to the fore, namely, the vanadium sulfides.…”

Water Splitting–Biosynthetic Hybrid System for CO2 Conversion using Nickel Nanoparticles Embedded in N‐Doped Carbon Nanotubes

“…[11] Another successful example incorporateda ne ngineereds train of Ralstonia eutropha and Co-P alloy/CoP i catalyzed water splitting to convert CO 2 to isopropanol with an energy efficiency exceeding 50 %. [21][22][23][24][25] This may result in al arge amount of metal ions leachingf rom the electrocatalyst during long term operation, and thereafter cause as ignificant inhibition on bacterial growth. [18][19][20] Most common catalysts are based on transition metal compounds (e.g.,N iP 2 ,M oS 2 ,C oS, Mo 2 C, and NiMo 3 S 4 )f or electrochemical water splitting, which usually have high metal content (> 50 %).…”

“…[18][19][20] Most common catalysts are based on transition metal compounds (e.g.,N iP 2 ,M oS 2 ,C oS, Mo 2 C, and NiMo 3 S 4 )f or electrochemical water splitting, which usually have high metal content (> 50 %). [21][22][23][24][25] This may result in al arge amount of metal ions leachingf rom the electrocatalyst during long term operation, and thereafter cause as ignificant inhibition on bacterial growth. [17,26] Also, the transition metals exposed on the outside surfaceo fe lectrocatalysts do not favor bacterial adhesion.…”

Oxygen-tolerant proton reduction catalysis: much O2 about nothing?

“…[1][2][3] Chemical-energy storage through water splitting generates both H 2 and O 2 and relies on efficient reduction and oxidation catalysts, respectively [reaction (1)]. [1][2][3] Chemical-energy storage through water splitting generates both H 2 and O 2 and relies on efficient reduction and oxidation catalysts, respectively [reaction (1)].…”