摘要
Efficient and cost-effective electrocatalysts that can operate across a wide range of pH conditions are essential for green hydrogen production.Inspired by biological systems,Fe_(7)S_(8)nanoparticles incorporated on polydopamine matrix electrocatalyst were synthesized by co-precipitation and annealing process.The resulting Fe_(7)S_(8)/C electrocatalyst possesses a three-dimensional structure and exhibits enhanced electrocatalytic performance for hydrogen production across various pH conditions.Notably,the Fe_(7)S_(8)/C electrocatalyst demonstrates exceptional activity,achieving low overpotentials of 90.6,45.9,and 107.4 mV in acidic,neutral,and alkaline environments,respectively.Electrochemical impedance spectroscopy reveals that Fe_(7)S_(8)/C exhibits the lowest charge transfer resistance under neutral conditions,indicating an improved proton-coupled electron transfer process.Continuous-wave electron paramagnetic resonance results confirm a change in the valence state of Fe from 3+to 1+during the hydrogen evolution reaction(HER).These findings closely resemble the behavior of natural[FeFe]-hydrogenase,known for its superior hydrogen production in neutral conditions.The remarkable performance of our Fe_(7)S_(8)/C electrocatalyst opens up new possibilities for utilizing bioinspired materials as catalysts for the HER.
基金
Outsourced R&D Project of Korea Electric Power Corporation(KEPCO),Grant/Award Number:R23XO04
National Research Foundation of Korea(NRF)
Korean government(MSIT),Grant/Award Numbers:NRF-2021M3H4A6A01045764,2020M3H4A3106313,2021R1C1C1004264,2021R1A4A1032114
Korea Institute for Advancement of Technology(KIAT)
Ministry of Trade,Industry,and Energy(MOTIE),Korea,Grant/Award Number:P0025273
Korea Institute of Energy Technology Evaluation and Planning(KETEP)and the Ministry of Trade,Industry&Energy(MOTIE)of the Republic of Korea,Grant/Award Number:20224000000320
KENTECH Research Grant
Korea Institute of Energy Technology,Republic of Korea,Grant/Award Number:KRG2022-01-016
Regional Innovation Strategy(RIS)through the National Research Foundation of Korea(NRF)
Ministry of Education(MOE),Grant/Award Number:2021RIS-002。
