Iron-nickel sulfide ((Ni,Fe)S) is one of the most promising bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media because of their metallic conductivity and low cost. However, the reported HER activity of (Ni,Fe)S is still unsatisfactory. Herein, three-dimensional self-supported phosphorus-doped (Ni,Fe)S nanosheet arrays on Ni foam (P-(Ni,Fe)S/NF) are synthesized by a simple one-step simultaneous phosphorization and sulfuration route, which exhibits dramatically enhanced HER activity as well as drives remarkable OER activity. The incorporation of P significantly optimized the hydrogen/water absorption free energy (Δ/Δ), enhanced electrical conductivity, and increased electrochemical surface area. Accordingly, the optimal P-(Ni,Fe)S/NF exhibits relatively low overpotentials of 98 and 196 mV at 10 mA cm for HER and OER in 1 M KOH, respectively. Furthermore, an alkaline electrolyzer comprising the P-(Ni,Fe)S/NF electrodes needs a very low cell voltage of 1.54 V at 10 mA cm and exhibits long-term stability and outperforms most other state-of-the-art electrocatalysts. The reported electrocatalyst activation approach by anion doping can be adapted for other transition-metal chalcogenides for water electrolysis, offering great promise for future applications.
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http://dx.doi.org/10.1021/acsami.9b04528 | DOI Listing |
Materials (Basel)
October 2024
Tianjin Heavy Equipment Engineering Co., Ltd., China First Heavy Industries Co., Ltd., Tianjin 300457, China.
In this study, we optimized the traditional composition of AISI 8630 steel and evaluated its corrosion resistance through a series of tests. We conducted corrosion tests in a 3.5% NaCl solution and performed a 720 h fixed-load tensile test in accordance with the NACE TM-0177-2016 standard to assess sulfide stress corrosion cracking (SSCC).
View Article and Find Full Text PDFJ Colloid Interface Sci
September 2024
School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology Zhenjiang, Jiangsu 212003, PR China. Electronic address:
Philos Trans A Math Phys Eng Sci
June 2024
Science Innovation Platforms, Natural History Museum , London SW7 5BD, UK.
Exposure of the Hubble Space Telescope to space in low Earth orbit resulted in numerous hypervelocity impacts by cosmic dust (micrometeoroids) and anthropogenic particles (orbital debris) on the solar arrays and the radiator shield of the Wide Field and Planetary Camera 2, both subsequently returned to Earth. Solar cells preserve residues from smaller cosmic dust (and orbital debris) but give less reliable information from larger particles. Here, we present images and analyses from electron, ion and X-ray fluorescence microscopes for larger impact features (millimetre- to centimetre-scale) on the radiator shield.
View Article and Find Full Text PDFNature
May 2024
Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan, Republic of Korea.
Natural diamonds were (and are) formed (thousands of million years ago) in the upper mantle of Earth in metallic melts at temperatures of 900-1,400 °C and at pressures of 5-6 GPa (refs. ). Diamond is thermodynamically stable under high-pressure and high-temperature conditions as per the phase diagram of carbon.
View Article and Find Full Text PDFJ Colloid Interface Sci
August 2024
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China; State Key Laboratory of Reliability and Intelligence Electrical Equipment, Key Laboratory of Advanced Intelligent Protective Equipment Technology, Ministry of Education, Hebei University of Technology, Tianjin 300401, China. Electronic address:
Owing to the high cost of precious metal catalysts for the oxygen evolution reaction (OER), the production of highly efficient and affordable electrocatalysts is important for generating pollution-free and renewable energy via electrochemical processes. A facile hydrothermal approach was employed to synthesize hybrid mesoporous iron-nickel bimetallic sulfides @ P, N-doped carbon for the OER. The prepared FeNiS@C exhibited an overpotential (η) of 250 mV at 10 mA/cm.
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