Accelerated oxygen evolution kinetics on NiFeAl-layered double hydroxide electrocatalysts with defect sites prepared by electrodeposition

Electrochemical preparation of nano/micron structure transition metal-based catalysts for the oxygen evolution reaction

“…Our group fabricated an amorphous D-NiFeAl-LDH electrocatalyst with defect sites on NF via electrodeposition followed by alkali etching. 91 The D-NiFeAl-LDH electrocatalyst exhibited remarkable OER catalytic activity with a small overpotential of 262 mV at 10 mA cm À2 and a low Tafel slope of 41.67 mV dec À1 in 1 M KOH, which is even better than most of the reported NiFe-LDH electrocatalysts. The accelerated OER kinetics was mainly due to the introduction of iron and nickel defects in the D-NiFeAl-LDH nanosheets, which effectively adjusted the surface electronic structure and improved the electrocatalytic performance of the OER.…”

“…3c, our research group adopted this method to electrodeposit a NiFeAl-LDH catalyst on NF first; then, a type of high-efficiency D-NiFeAl-LDH/NF oxygen evolution catalyst with a metal deficiency was prepared by a strong alkali etching method. 91 Jin et al 76 used a two-step electrodeposition method to prepare a Ni@ZnO nanoarray structure on ITO, and then 2 mM H 2 SO 4 was employed to etch ZnO to obtain hollow Ni nanotube arrays. On this basis, a highly efficient oxygen evolution catalyst with amorphous NiCo-LDH nanosheet-coated hollow nanotube arrays was prepared by further electrodeposition, as shown in Fig.…”

“…Copyright 2017, American Chemical Society. (c) Schematic illustration of the preparation of D-NiFeAl-LDHs 91. Copyright 2019, Elsevier.…”

Effect of cobalt doping on photocatalytic water splitting activity of NiTi-layered double hydroxide

“…[30][31][32][33] Metal doping in LDHs, thus, provides a facile and straightforward pathway to change the coordination environment around the metal by altering the M-O bond for hydroxides/oxides. 34,35 This alteration in the structure creates oxygen vacancies that improve catalytic activity. 36 Oxygen vacancies around the metal sites create active non-coordinated sites, increasing the conductivity and accelerating the electron transfer in the OER.…”

Novel synthetic strategy for a nanostructured metal hydroxysulfide‐C and its initial electrochemical investigation as a new anode material for potassium‐ion batteries

“…This study pioneers the synthesis of metal hydroxide@metal hydroxide-C yolk-shell nanospheres by employing a simple water-vapor-assisted heat treatment, which is safer than the conventional hydroxylation methods using strong alkali, ammonia, and urea with high pressure. [20][21][22] Cobalt nitrate infiltrated into porous and hollow carbon nanospheres was converted into cobalt hydroxide nanocrystals in a water-vapor atmosphere at 200 C to form yolk-shell structured cobalt hydroxide@cobalt hydroxide-C (denoted as Co(OH) 2 @C). The uniquely structured Co(OH) 2 @C nanospheres were finally transformed into cobalt hydroxysulfide@cobalt hydroxysulfide-C nanospheres (denoted as Co(OH)S@C) by a roomtemperature sulfidation process using Na 2 S solution.…”