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A General Approach for the Synthesis of Nitrogen-doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution by Chakrabartty, Sukanta; Sahu, Damini; Raj, C. Retna is a Engineering article available to read on EtoBox.

What is A General Approach for the Synthesis of Nitrogen-doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution about?

A general strategy for the synthesis of core-shell nanostructure of nitrogen-doped carbon encapsulated MoP and WP (MoP@NC and WP@NC) and the electrochemical hydrogen evolution reaction (HER) are demonstrated. The synthetic procedure involves the self-assembling of polyoxometalate (M=Mo/W) and phytic acid on polyetheleneimine backbone and the subsequent pyrolysis of the self-assembled supramolecular aggregates in inert atmosphere without traditional phosphidating agent. MoP@NC has quasi-spherical shape with MoP core (57 nm) and nitrogen doped porous carbon shell whereas WP@NC has nitrogen-doped carbon coated rod-like nanostructure. MoP@NC has large amount of pyridinic (~59%) and Mo-bonded (~33 %) nitrogen. MoP@NC is highly active towards hydrogen evolution reaction (HER) and delivers the benchmark current density 10 mA/cm 2 at overpotential of 52, 106 and 171 mV in acidic, alkaline and neutral pH, respectively. It shows a Tafel slope of 49 mV/dec, high turnover frequency (0.28 s -1 at  = 100 mV) and faradaic efficiency (96%) in acidic electrolyte. MoP@NC has remarkable durability in acidic and alkaline pH with negligible increase in overpotential after 1000 extensive repeated poten

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Author

Chakrabartty, Sukanta; Sahu, Damini; Raj, C. Retna

Publisher

American Chemical Society; American Chemical Society (ACS) (ISSN 2574-0962)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)