Dual-sized NiFe layered double hydroxides in situ grown on oxygen-decorated self-dispersal nanocarbon as enhanced water oxidation catalysts

Abstract

A complex of hierarchically structured hydroxides with oxygen-decorated graphene/carbon nanotube hybrids was fabricated through defect-anchored nucleation andin situgrowth towards superior reactivity for oxygen evolution.

Toward a Low‐Cost Artificial Leaf: Driving Carbon‐Based and Bifunctional Catalyst Electrodes with Solution‐Processed Perovskite Photovoltaics

“…Commonly employed materials for the current collector are bulk or porous metals, [ 15 ] whereas a popular choice for the catalyst is various types of metal-oxides. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] From a system-cost and practicality perspective, it is desirable to develop a functional lightweight and low-cost current collector and to identify a catalyst that is bifunctional in that it can drive the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in the same water solution. [ 14,[39][40][41][42][43][44] Here, we present an artifi cial-leaf device that delivers an STH effi ciency of 6.2% and a Faradaic H 2 evolution effi ciency of 100%.…”

An aqueous preoxidation method for monolithic perovskite electrocatalysts with enhanced water oxidation performance

“…Nevertheless, it still remains a great challenge to efficiently regulate the nanoscale morphology of perovskite oxides and integrate the active sites with conductive scaffolds at the same time, thereby limiting the full demonstration of their intrinsic OER activity. Controlled synthesis of nanosized perovskite oxide particles with abundant active sites and, simultaneously, in situ hybridization into hierarchical porous conductive frameworks with strong interaction are expected to optimize the perovskite oxide–based catalysts ( 34 , 35 ). However, perovskite oxides are dominantly achieved through high-temperature annealing at 600° to 900°C under an oxidative atmosphere.…”

FeNi Layered Double-Hydroxide Nanosheets on a 3D Carbon Network as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

“…As a consequence, it is crucial to search for new compounds of earth‐abundant metals with a similar catalytic activity as the low‐cost alternatives to noble metal oxides. In recent years, OER catalysts based on 3d transition metals (Fe, Co, Ni, and Mn) have been increasingly attracting more research interests, including their metal oxides, hydroxides, phosphates, borates, and layered double hydroxides (LDHs) in particular. LDHs are a class of 2D layered materials composed of positively charged brucite‐like layers spaced by charge‐balancing anions and interlayer water molecules, following a general formula of where A 2+ and B 3+ are metal cations and C n − is the interlayer anion, respectively.…”

“…LDHs are a class of 2D layered materials composed of positively charged brucite‐like layers spaced by charge‐balancing anions and interlayer water molecules, following a general formula of where A 2+ and B 3+ are metal cations and C n − is the interlayer anion, respectively. LDHs have been widely studied as functional materials for battery applications and their special nanostructure make them perfect candidates for OER catalysts that actively catalyze the water oxidation . However, they still suffer from their intrinsic shortages such as their low electrical conductivity, limited specific surface area, and strong tendency to aggregate …”