Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 7, Pages 2843-2853Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b06920
Keywords
transition metal phosphates; ambient temperature synthesis; chemical stability; oxygen evolution reaction; supercapacitor
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1D1A1B07051249]
- Nano Material Technology Development Program [NRF-2015M3A7B6027970]
- Science and Technology Amicable Relationships (STAR) Program of MSIT/NRF [NRF-2019K1A3A1A21031052]
- Center for Integrated Smart Sensors - Ministry of Science, ICT, and Future Planning, Republic of Korea [CISS-2012M3A6A6054186]
- National Research Foundation of Korea [2019K1A3A1A21031052, 21A20130000016] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Recently, transition-metal phosphides and phosphates have been recognized as candidates for electrochemical energy storage and conversion application. However, the preparation of such materials usually requires high energy consumption and toxic precursors which are considered to be drawbacks for real applications. In this study, we report ambient temperature synthesis of transition-metal phosphates for oxygen evolution reaction (OER) and supercapacitors. The prepared iron-doped porous nickel pyrophosphate (NFPy) nanoparticle is synthesized via simple stirring in ambient temperature using only the precursor for Ni, Fe, and pyrophosphate without any heat treatment. The usage of pyrophosphate promotes facile Ni oxidation and high chemical stability, which overall is beneficial for electrochemical applications and the environment. The OER performance of NFPy shows promising results which required an overpotential of 0.210 V to reach 10 mA.cm(-2). Also, with the help of carbon nanotubes, the supercapacitor using NFPy exhibits a good electrochemical performance with a capacity of 517 C.g(-1) at 1 A.g(-1). The prepared NFPy possesses excellent long-term chemical stability that maintained its chemical valence state and electrochemical performance for over 8 months despite the exposure of air.
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