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

Author:

Dey Tapan1,Rajput Anubha2,Jhaa Gaurav3,Matsagar Babasahab M.4ORCID,Chen Norman C.‐R45,Kumar Nitish6,Salunkhe Rahul6,Wu Kevin C.‐W.478,Chakraborty Biswarup2,Dutta Saikat1ORCID

Affiliation:

1. Electrochemical Energy & Sensor Research Laboratory Amity Institute of Click Chemistry Research & Studies Amity University Noida India

2. Department of Chemistry Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India

3. Chemical Information Sciences Laboratory Department of Chemistry Pondicherry University Kalapet, Pondicherry 605014 India

4. Department of Chemical Engineering National Taiwan University No. 1, Sec. 4, Roosevelt Road Taipei 10617 Taiwan

5. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taiwan

6. Materials Research Laboratory Department of Physics Indian Institute of Technology Jammu Jammu India

7. Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan Taiwan

8. Department of Chemical Engineering Chung Yuan Christian University No. 200, Zhongbei Rd., Zhongli Dist. Taoyuan City 320 Taiwan

Abstract

AbstractWe 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.

Publisher

Wiley

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