Issue 18, 2023

Oxygen vacancies meet partial S substitution: an effective strategy to achieve obvious synergistic effects and adjustable electrochemical behavior in NiFe-LDH for enhanced OER and capacitive performance

Abstract

A bifunctional electrode (oxygen evolution reaction (OER) and capacitive properties) with high electrochemical activity is crucial for both supercapacitors and water splitting devices. Herein, a S and oxygen vacancy co-doped nickel-iron layered double hydroxide (NiFe-LDHS) electrode was delicately fabricated through combining acid etching and sulfidation strategies. The strong synergy between S and oxygen vacancies was firmly confirmed in this work, which increased the intrinsic activity of the electrode via a double internal polarization field path. Furthermore, the impact of S doping on the bifunctionality of the electrode was systematically studied. The characterization and measurement results demonstrated that the sample after S doping exhibited adjustable electrochemical behavior, thereby improving the bifunctional activity of the electrode further. Thus, the NiFe-LDHS electrode showed outstanding catalytic and energy storage properties. Specifically, the OER overpotential was only 224 mV at 10 mA cm−2, and the stability in an alkaline electrolyte could reach 32 h at 50 mA cm−2. In terms of capacitive performance, the NiFe-LDHS electrode showed a high areal capacitance of 6.33 F cm−2. The assembled NiFe-LDHS//AC asymmetric supercapacitor (ASC) with 2.0 V cell voltage displayed a high energy density of 0.279 mW h cm−2 and long cycling stability. These results indicated the versatile applicability of the NiFe-LDHS electrode in both water splitting devices and supercapacitors and revealed promising prospects for advancing the construction of high-performance bifunctional electrode materials.

Graphical abstract: Oxygen vacancies meet partial S substitution: an effective strategy to achieve obvious synergistic effects and adjustable electrochemical behavior in NiFe-LDH for enhanced OER and capacitive performance

Supplementary files

Article information

Article type
Research Article
Submitted
16 जून 2023
Accepted
21 जुलाई 2023
First published
24 जुलाई 2023

Inorg. Chem. Front., 2023,10, 5391-5405

Oxygen vacancies meet partial S substitution: an effective strategy to achieve obvious synergistic effects and adjustable electrochemical behavior in NiFe-LDH for enhanced OER and capacitive performance

D. Shi, Y. Ji, F. Lu, J. Yao, S. Zhang and P. Zhang, Inorg. Chem. Front., 2023, 10, 5391 DOI: 10.1039/D3QI01131C

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