Two Birds with One Stone: Contemporaneously Boosting OER Activity and Kinetics for Layered Double Hydroxide Inspired by Photosystem II

Abstract

The poor catalytic kinetics together with unsatisfied activity of nonprecious metal electrocatalysts for oxygen evolution reaction hamper their applications in industrial water electrolysis. Inspired by the oxygen evolution cluster of photosystem II in nature, Li + -doped NiFe layered double hydroxide modified with carboxylate is constructed by in situ growth on Ni foam (NFCL(70)-LDH @ NF) via one-pot redox synthesis. Herein, lithium acetate is introduced to regulate the electronic structure and improve proton transfer kinetics, thus "Two birds with one stone". The targeted product exhibits highly improved OER performance in 1 M KOH at room temperature (159 and 224 mV at 10 and 100 mA cm −2 ), as well as dramatically decreased Tafel slope (47.9 mV dec -1 ). Control experiments and theoretical calculations uncover that the presence of Li + modulates the local electronic structure and stabilizes the OOH* intermediate. Specifically, the carboxylate ligands serve as relays to promote proton transfer efficiency, which is similar to the concerted proton electrons transfer in photosystem II. Moreover, NFCL(70)-LDH @ NF maintains the excellent performance over a month under the simulated industrial condition. The exploration of high performance, triggered synergistically by Li + doping and acetate-modifying, sheds light on the design of organic-inorganic hybrid electrocatalysts for highly efficient OER.

Trimesic acid anchored electrocatalysts of bioinspired design: Unique static and dynamic compatibility enhanced water oxidation

“…As shown in Figure S2, the diffraction peaks are indexed to standard Ni(OH) 2 (PDF# 38-0715), being consistent with LDH. 21 Scarce difference in XRD patterns indicates that the phase composition are well maintained after the introduction of ligand. The high-resolution transmission electron microscopy (HR-TEM) images are further carried out to detect structure information.…”

Boosting electrocatalytic water oxidation by vanadium–iron–nickel trimetal hydroxide catalysts through interphase ionic migration method

“…11,12 As a result, developing costeffective electrocatalysts from earth-abundant metals plays an essential role in robust and efficient OER electrocatalysts. 13 Currently, a variety of transition metal (Fe, Co, Ni and Cu)based nanomaterials (alloys, 14,15 oxides, 16 hydroxides, [17][18][19] sulfides, 20,21 phosphides, [22][23][24] and nitrides 25,26 ) have been reported as extraordinarily promising noble-metal-substitute OER catalysts under alkaline conditions. Thereinto, FeNibased materials, especially the FeNi hydroxides, have shown excellent OER electrocatalytic activity in alkaline media.…”

Ternary FeCo2Mo5 Oxyhydroxide Nanosheets Integrate on the Surface-Vulcanized Ni Foam for Excellent Electrocatalytic Oxygen Evolution

“…11 For example, Lu et al decorated Li + -doped NiFe LDH on a Ni foam [NFCL(70)-LDH@NF] and found that it exhibited excellent OER performance over a month under the simulated industrial condition. 12 Regrettably, less-exposure active sites and poor electron conductivity tremendously limited its OER performance, necessitating further development. Transition-metal chalcogenides such as NiS, 13 Ni 3 S 2 , 14 MoS 2 , 15 and CoS 16 have attracted widespread attention because of their tunable chemical composition and costeffectiveness.…”

“…Among them, transition-metal-based layered double hydroxide (LDH) exhibits broad application prospects, which contains hydroxide ions as well as divalent and trivalent metal cation layers and is considered as the most promising catalyst materials for electrocatalysis due to its unique two-dimensional (2D) structure, abundant interstratified channels, and rich layered structures . For example, Lu et al decorated Li + -doped NiFe LDH on a Ni foam [NFCL(70)-LDH@NF] and found that it exhibited excellent OER performance over a month under the simulated industrial condition . Regrettably, less-exposure active sites and poor electron conductivity tremendously limited its OER performance, necessitating further development.…”