Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS x/Ni(OH)2/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis

Lu Xia, Wulyu Jiang, Heinrich Hartmann, Joachim Mayer, Werner Lehnert, Meital Shviro

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Nickel (poly)sulfides have been widely studied as anodic catalysts for alkaline water electrolysis owing to their diverse morphologies, high catalytic activities in the oxygen evolution reaction (OER), and low cost. To utilize low-cost and high-efficiency polysulfides with industry-relevant cycling stability, we develop a Ni-rich NiSx/Ni(OH)2/NiOOH catalyst derived from NiS2/Ni3S4nanocubes. Ni-rich NiSx/Ni(OH)2/NiOOH shows improved OER catalytic activity (η = 374 mV@50 mA cm-2) and stability (0.1% voltage increase) after 65 h of a galvanostatic test at 10 mA cm-2compared with commercial Ni/NiO and hydrothermally synthesized Ni(OH)2(both show η > 460 mV@50 mA cm-2along with 4.40 and 1.92% voltage increase, respectively). A water-splitting electrolyzer based on Pt/C||AF1-HNN8-50||NiSx/Ni(OH)2/NiOOH exhibits a current density of 1800 mA cm-2at 2.0 V and 500 h high-rate stability at 1000 mA cm-2with negligible attenuation of only 0.12 mV h-1. This work provides an understanding of truly stable species, intrinsic active phases of Ni polysulfides, their high-rate stability in a real cell, and sheds light on the development of stable chalcogenide-based anodic electrocatalysts for anion exchange membrane water electrolysis (AEMWE).

Original languageEnglish
Pages (from-to)19397-19408
Number of pages12
JournalACS applied materials & interfaces
Volume14
Issue number17
DOIs
StatePublished - 4 May 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Keywords

  • alkaline water electrolysis
  • electrocatalysts
  • nickle polysulfides
  • oxygen evolution reaction
  • sulfur leaching

Fingerprint

Dive into the research topics of 'Multistep Sulfur Leaching for the Development of a Highly Efficient and Stable NiS x/Ni(OH)2/NiOOH Electrocatalyst for Anion Exchange Membrane Water Electrolysis'. Together they form a unique fingerprint.

Cite this