Rapid Electronic Transport Channel of Co‐P with Mo in a Heterostructure Embedded with P, N Dual Doped Porous Carbon for Electrocatalytic Oxygen and Hydrogen Evolution
Journal
ChemNanoMat
Journal Volume
10
Journal Issue
7
Start Page
e202400089
ISSN
2199-692X
2199-692X
Date Issued
2024-07
Author(s)
Tapan Dey
Anubha Rajput
Gaurav Jhaa
Babasahab M. Matsagar
Norman C.‐R Chen
Nitish Kumar
Rahul Salunkhe
Biswarup Chakraborty
Saikat Dutta
DOI
10.1002/cnma.202400089
Abstract
We developed a molybdenum (Mo)-doped cobalt (Co)-heterostructure embedded on a phosphorous (P) and nitrogen (N) dual-doped porous carbon which exhibits an intrinsic electronic transport channel of Co to Mo and P. The P,Mo,O−Co/PNC/NF (NF=Nickel foam) electrode offers 335 mV overpotential at 10 mA cm−2 in OER as compared with PMA-ZIF67-NC/NF and ZIF67-NC/NF electrode with an overpotential of 357 and 373 mV respectively. Linear sweep voltammetry (LSV) of overall water splitting (OWS) supports that the current density gradually increased at a cell potential of 1.6 V with a maximum of 40 mA with a corresponding cell potential of 1.79 V at a current density of 10 mA cm−2. Density functional theory (DFT) calculations for water adsorption on optimized [111] surface of Co, CoMo, and CoMoP2 with adsorbed H2O and corresponding lattice determine the electron density difference of [111] surface with adsorbed H2O for Eads (eV) 4.23 corresponds to adsorption energy for CoMoP2. XANE-EXAFS spectroscopy of P,Mo,O−Co/PNC at Co K edge and Mo K edge suggests the presence of higher valence of both Cox+ and Mox+ without metallic Co and Mo and Co−P and Mo−P bonds as major structural units due to phosphidation as determined by R-space FT-EXAFS spectra.
Subjects
Co−P
Mo heterostructure
hydrogen evolution reaction
oxygen evolution reaction
P
N-dual doping
XANE-EXAFS
Publisher
Wiley
Type
journal article