Topochemical Domain Engineering to Construct 2D Mosaic Heterostructure with Internal Electric Field for High-Performance Overall Water Splitting

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number107566
Journal / PublicationNano Energy
Volume101
Online published3 Jul 2022
Publication statusPublished - Oct 2022

Abstract

Rational design of bifunctional two-dimensional (2D) heterostructures with excellent activity and durability remains a great challenge for electrocatalytic water splitting. Herein, we propose a topochemical domain engineering to realize 2D mosaic heterostructures with ultrafine phosphide nanodomains highly dispersed on the surface of Ru doped CoMoO4 nanosheets (denoted as Ru-CMOP), which are vertically interconnected on the conductive skeleton assembling a 3D array structure. The as-prepared Ru-CMOP electrocatalyst exhibits excellent activity and long-term stability with the overpotentials of 114 and 286 mV at 100 mA cm−2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH solution, respectively, outperforming most reported metal phosphide-based bifunctional heterostructures. Moreover, an assembled electrolyzer using the Ru-CMOP as anode and cathode simultaneously delivers cell voltages of 1.697 V and 1.828 V to achieve 100 mA cm−2 and 500 mA cm−2, respectively, with outstanding durability at 250 mA cm−2 for 120 h. Density functional theory calculations and experimental results indicate that the strongly coupled heterointerfaces with built-in electric field can facilitate electron transfer while multi-porous nanosheet arrays contribute to active sites exposure and mass/gas transport, thereby synergistically accelerating the reaction kinetics. Additionally, combining with a commercial silicon photovoltaic solar cell, the electrolyzer can be efficiently and robustly established, demonstrating the great potential for practical photovoltaic-electrolysis applications.

Research Area(s)

  • Nanodomain, Phosphorization, Two-dimension, Heterostructure, Overall water splitting

Citation Format(s)