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Sodium‐nickel pyrophosphate as a novel oxygen evolution electrocatalyst in alkaline medium
Author(s) -
Song Hee Jo,
Yoon Hyunseok,
Ju Bobae,
Kim DongWan
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17195
Subject(s) - nip , overpotential , electrocatalyst , oxygen evolution , pyrophosphate , catalysis , nickel , electrochemistry , chemical engineering , materials science , sodium , water splitting , inorganic chemistry , chemistry , nuclear chemistry , metallurgy , electrode , composite material , organic chemistry , enzyme , photocatalysis , engineering
The development of robust and low‐cost oxygen evolution reaction (OER) electrocatalysts is a challenging issue in electrochemical water‐splitting technology. Tailoring the electrocatalysts through nano‐ and composition engineering is an effective strategy to enhance the intrinsic and extrinsic electrocatalytic activities. In this study, for the first time, sodium‐nickel pyrophosphate (Na 2 NiP 2 O 7 ) is proposed as a novel OER electrocatalyst in alkaline environment. First, the electrocatalytic performance of micron‐sized Na 2 NiP 2 O 7 (Na 2 NiP 2 O 7 ‐micron) is evaluated. In addition, nanoscale Na 2 NiP 2 O 7 (Na 2 NiP 2 O 7 ‐nano) and Fe‐substituted Na 2 NiP 2 O 7 ‐nano (Na 2 Ni 1− x Fe x P 2 O 7 ‐nano) are synthesized to improve the electrocatalytic performance of Na 2 NiP 2 O 7 . Although Na 2 NiP 2 O 7 ‐micron exhibits low electrocatalytic OER activity in alkaline medium, its catalytic activity can be significantly improved through reducing the particle size and substituting Fe in the Ni sites. The synthesized Na 2 Ni 0.75 Fe 0.25 P 2 O 7 ‐nano exhibits optimal catalytic activity with an overpotential of 300 mV at a current density of 10 mA/cm 2 and long‐term durability with continuous O 2 generation over 100 hours in alkaline medium.