Metal-Organic Framework-Derived 2D NiCoP Nanoflakes from Layered Double Hydroxide Nanosheets for Efficient Electrocatalytic Water Splitting at High Current Densities
Journal
ACS Sustainable Chemistry and Engineering
Journal Volume
10
Journal Issue
35
Pages
11577
Date Issued
2022-09-05
Author(s)
Abstract
Two-dimensional (2D) metal-organic framework (MOF)-derived NiCoP nanoflakes, denoted as NiCo(nf)-P, are prepared via in situ growth of MOF using NiCo layered double hydroxide (LDH) as a sacrificial template, followed by phosphorization. The nanoparticle-decorated 2D nanoflake morphology and the intrinsic porosity inherited from the MOF precursor render NiCo(nf)-P a highly efficient bifunctional electrocatalyst toward hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and overall water splitting. In 1.0 M KOH electrolyte solution, NiCo(nf)-P shows low overpotentials of 199/283/317 and 315/378/416 mV at 100/500/1000 mA cm-2 for HER and OER, respectively. For overall water splitting, it only needs low cell voltages of 1.74/1.86/1.94 V to reach 100/500/1000 mA cm-2, with outstanding long-term stability over 30 h. The excellent catalytic performance of NiCo(nf)-P outperforms most of the NiCoP-based electrocatalysts reported so far, indicating its great potential for the overall water splitting application.
Subjects
high current densities | layered double hydroxides | metal-organic frameworks | nanoflakes | overall water splitting
Publisher
AMER CHEMICAL SOC
Type
journal article