Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 34, Pages 30774-30785Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08074
Keywords
transition metal phosphide; electrodeposition; selective leaching; nanoporous structure; hydrogen evolution reaction; proton exchange membrane water electrolyzer
Funding
- National Research Foundation of Korea (NRF) - Korea government MSIT [2018R1A4A1022647, 2018R1A1A1A05077634, 2019M3E6A1064763]
- Korea Institute of Energy Technology Evaluation and Planning - Korea government MOTIF [2019281010007A]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2019281010007A] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2019M3E6A1064763, 2018R1A1A1A05077634, 2018R1A4A1022647] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Hydrogen production via a proton exchange membrane water electrolyzer (PEMWE) is an essential technology to complement discontinuity of renewable energies. Development of a high-efficiency and cost-effective gas diffusion electrode (GDE), which is a key component of this technology, remains a challenge. Here, we report a high-performance Ni phosphide GDE prepared by simple electrochemical methods. Selective leaching of excess Ni in electrodeposited NixP1-x enabled fabrication of a nanoporous NiP GDE with a large electrochemical surface area (ECSA). In half-cell tests, the nanoporous NiP GDE demonstrated a hydrogen-evolving current density of -10 mA/cm(2) at an overpotential of 103 mV with good stability. In the single-cell tests, the PEMWE employing a nanoporous NiP cathode exhibited a current density of 1.47 A/cm(2) at a cell voltage of 2.0 V, which was the competitive performance among state-of-the-art non-noble cathodes reported to date.
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