Conductive Leaflike Cobalt Metal–Organic Framework Nanoarray on Carbon Cloth as a Flexible and Versatile Anode toward Both Electrocatalytic Glucose and Water Oxidation

Abstract

Transition metal-organic frameworks (MOFs), on account of their unique inherent properties of large pore volume, high specific surface area, tunable pores, and good catalytic activity, have been highly regarded as superior catalysts recently for water electrolysis, supercapacitors, batteries, sensors, and so on. Herein, we report on a cobalt MOF phase with 3D well-aligned nanosheets array architecture on carbon cloth (Co-MOF NS/CC), fabricated by a facile ambient liquid-phase deposition, could serve as a self-standing Janus catalytic electrode toward both glucose and water oxidation. It shows good glucose-sensing performance with low determination limit and large detection range. Also, it exhibits high water-oxidation efficiency with low overpotential and good durability. This work demonstrates the potential of utilizing transition-metal based well-aligned MOF nanoarrays for electrocatalytic oxidation.

A bio-inspired coordination polymer as outstanding water oxidation catalyst via second coordination sphere engineering

“…Transition metal coordination polymers such as metal-organic frameworks (Ni, Co, Fe MOFs) have been extensively studied as a new class of catalysts toward OER in alkaline solutions [24][25][26][27][28][29][30][31] . Unfortunately, only a few transition metal coordination polymers with low overpotential and excellent stability have been reported.…”

Nickel Foam‐Supported Amorphous FeCo(Mn)−O Nanoclusters with Abundant Oxygen Vacancies through Selective Dealloying for Efficient Electrocatalytic Oxygen Evolution

“…The OER performances of the as‐synthesized electrocatalysts are tested in 1.0 M KOH solution using a typical three‐electrode cell. As shown in Figure a, a weak redox peak located at ∼1.33 V is due to the oxidation of Co 2+ to Co 3+ . The FeCo(Mn)−O/NF only need an overpotential of 235 mV to reach the current density of 10 mA cm −2 ( η 10 =235 mV), significantly lowered by 18∼142 mV than that of FeCo−O/NF ( η 10 =253 mV), FeCoMn/NF ( η 10 =265 mV), bare NF ( η 10 =377 mV) and even benchmark OER electrocatalyst RuO 2 /NF ( η 10 =304 mV).…”

“…As shown in Figure 4a, a weak redox peak located at 1.33 V is due to the oxidation of Co 2 + to Co 3 + . [44,45] The FeCo (Mn)À O/NF only need an overpotential of 235 mV to reach the current density of 10 mA cm À 2 (η 10 = 235 mV), significantly lowered by 18~142 mV than that of FeCoÀ O/NF (η 10 = 253 mV), FeCoMn/NF (η 10 = 265 mV), bare NF (η 10 = 377 mV) and even benchmark OER electrocatalyst RuO 2 /NF (η 10 = 304 mV). Moreover, the performance of FeCo(Mn)À O/NF even outperforms many reported state-of-the-art FeCo-based OER electrocatalysts, such as FeCoPi (η 10 = 273 mV), [46] Fe 0.33 Co 0.67 OOH (η 10 = 266 mV) [47] and Co 3 O 4 /CoÀ Fe oxide (η 10 = 297 mV, Table S2).…”

Rational Design of Nanoarray Architectures for Electrocatalytic Water Splitting

“…Compared to various electrocatalysts, MOFs with well‐ordered tunable porous structure, high internal surface area, and good thermal and chemical stability have also attracted attention as promising electrocatalysts. For instances, 3D well‐aligned cobalt MOF nanosheet arrays on the carbon cloth revealed a low overpotential and good durability toward water oxidation . M‐BTC MOF nanoarrays (M = Fe, Ni; BTC = 1,3,5‐benzenetricarboxylic acid) with tunable metal ions and the regulation of metal contents demonstrated a low Tafel slope (47 mV per decade) and a small overpotential (270 mV) at current density of 10 mA cm −2 and outstanding stability .…”