Self-Supported Nickel Iron Layered Double Hydroxide-Nickel Selenide Electrocatalyst for Superior Water Splitting Activity
- Authors
- Dutta, Soumen; Indra, Arindam; Feng, Yi; Song, Taeseup; Paik, Ungyu
- Issue Date
- Oct-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- energy conversion; layered double hydroxide; low overpotential; synergistic effect; overall water splitting
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.39, pp.33766 - 33774
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 39
- Start Page
- 33766
- End Page
- 33774
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5376
- DOI
- 10.1021/acsami.7b07984
- ISSN
- 1944-8244
- Abstract
- The design of efficient, low-cost, and stable electrocatalyst systems toward energy conversion is highly demanding for their practical use. Large scale electrolytic water splitting is considered as a promising strategy for clean and sustainable energy production. Herein, we report a self-supported NiFe layered double hydroxide (LDH)-NiSe electrocatalyst by stepwise surface-redox-etching of Ni foam (NF) through a hydrothermal process. The as-prepared NiFe LDH-NiSe/NF catalyst exhibits far better performance in alkaline water oxidation, proton reduction, and overall water splitting compared to NiSex/NF or NiFe LDH/NF. Only 240 mV overpotential is required to obtain a water oxidation current density of 100 mA cm–2, whereas the same for the hydrogen evolution reaction is 276 mV in 1.0 M KOH. The synergistic effect from NiSe and NiFe LDH leads to the evolution of a highly efficient catalyst system for water splitting by achieving 10 mA cm–2 current density at only 1.53 V in a two-electrode alkaline electrolyzer. In addition, the designed electrode produces stable performance for a long time even at higher current density to demonstrate its robustness and prospective as a real-life energy conversion system.
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