期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 39, 页码 33766-33774出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07984
关键词
energy conversion; layered double hydroxide; low overpotential; synergistic effect; overall water splitting
资金
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1A6A1A03013422]
- Energy Efficiency amp
- Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20142020104190]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20142020104190] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2016R1A6A1A03013422] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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