Highly porous Ni-P electrode synthesized by an ultrafast electrodeposition process for efficient overall water electrolysis

The development of high-efficiency catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential to lower the energy losses during water electrolysis. Herein, a highly porous Ni-P (HP Ni-P) electrode, prepared by an ultrafast electrodeposition within only ten secon...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020-06, Vol.8 (24), p.1269-1279
Main Authors: Song, DongHoon, Hong, Doosun, Kwon, YongKeun, Kim, HyoWon, Shin, Jaewook, Lee, Hyuck Mo, Cho, EunAe
Format: Article
Language:English
Subjects:
Catalysts
Charge transfer
Electrodeposition
Electrodes
Electrolysis
Hydrogen
Hydrogen evolution reactions
Hydrogen-based energy
Industrial water
Oxidation
Oxygen evolution reactions
Reaction kinetics
Tafel slopes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The development of high-efficiency catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is essential to lower the energy losses during water electrolysis. Herein, a highly porous Ni-P (HP Ni-P) electrode, prepared by an ultrafast electrodeposition within only ten seconds, is presented with superior electrocatalytic activity towards both HER and OER in alkaline media: overpotentials of 96 and 323 mV are required to reach a current density level of 100 mA cm −2 for HER and OER, respectively, with corresponding Tafel slopes of 32.9 and 44.0 mV dec −1 . Experimental analyses and theoretical calculations show that charge transfer occurs from Ni to P and the HER kinetics is accelerated by the increased hydrogen coverage, enhanced water dissociation ability, and optimized hydrogen adsorption energy on the HP Ni-P. Under OER conditions, surface P is oxidized into PO 4 3− , promoting oxidation of Ni to OER-active NiOOH and exposing abundant OER-active sites on the HP Ni-P surface. An alkaline electrolysis cell was constructed with HP Ni-P as the cathode and anode (Ni-P|Ni-P) and outperformed the Pt/C|IrO 2 cell at cell voltages exceeding 1.68 V. This work provides a practically applicable method to prepare HER and OER electrodes for use in industrial water electrolyzers, with insight into the activities of the catalysts. A brief summary of the HP Ni-P for efficient overall water electrolysis.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta03739g