Carbon-based active support for water oxidation electrocatalyst: Making full use of the available surface area

Introducing oxygen vacancies to NiFe LDH through electrochemical reduction to promote the oxygen evolution reaction

“…1,[7][8][9] Commercial noble metal-based catalysts, such as IrO 2 and RuO 2 , can effectively reduce the OER overpotential to accelerate the reaction rate, but the scarcity, high price, and poor stability of noble metals restrict their applications in practice. 2,[10][11][12] Therefore, it is essential to seek non-precious metal OER catalysts with low cost and high activity to develop water splitting technology. 5,[13][14][15] Transition metal-based materials, especially metal oxides or hydroxides based on Ni, Fe, Co, Cu, Mn, etc., owing to their abundance, low price, and eco-friendliness as well as good electrocatalytic activity and stability, have become widely studied OER electrocatalysts.…”

In‐situ Surface‐selective Removal of Al Element from NiFeAl Ternary Nanowires for Large‐current Oxygen Evolution Reaction

“…The catalytic OER kinetics of electrocatalysts was studied by using the corresponding Tafel plot by fitting the data into the Tafel equation: η = b log j + a , where η is the overpotential, b is the Tafel slope, and j is the current density [18,20] . As shown in Figure 4c, the Tafel slope of NiFeAl‐NW/NF‐S is 49.91 mV ⋅ dec −1, which is smaller than that of NiFe‐NS/NF (55.16 mV ⋅ dec −1 ), NiFeAl‐NW/NF (56.05 mV ⋅ dec −1 ), Al‐NS/NF (53.94 mV ⋅ dec −1 ), NF (68.41 mV ⋅ dec −1 ) and even commercial RuO 2 (62.97 mV ⋅ dec −1 , Figure 4i) and IrO 2 (59.35 mV ⋅ dec −1 ), indicating that NiFeAl‐NW/NF‐S is more favorable for OER.…”

“…The electrocatalytic activity of the catalyst is usually proportional to its electrochemical effective surface area (ECSA), while ECSA is linearly related to the double‐layer capacitance (C dl ) [20,30] . What's more, C dl is also usually used to quantitate the effective active surface areas of catalysts.…”

“…Nickel‐based compounds have been used as promising electrocatalysts for OER, with NiO x H y as the usual active phase [19,20] . Herein, NiFeAl‐nanowires supported on nickel foam (NiFeAl‐NW/NF) electrocatalysts with rich structural defects were prepared by the hydrothermal method and subsequent surface selective removal of Al element.…”

Metal‐Free Bifunctional Ordered Mesoporous Carbon for Reversible Zn‐CO2 Batteries

“…[ 38,39 ] Furthermore, the electrochemically active surface areas (ECSA) of the samples were also tested according to the double‐layer capacitance ( C dl ) method. [ 40 ] As displayed in Figure S14 (Supporting Information), NOMC exhibited a 3.2 times higher ECSA value than that of NC. The CO current densities ( j co ) of NOMC and NC were further normalized by the ECSA as shown in Figure S15 (Supporting Information).…”