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In this work, pulse electrodeposition method was proposed to directly deposit amorphous carbon coating (ACC) onto 316L stainless steel substrate in choline chloride-ethylene glycol deep eutectic solvent (DES) mixed with ammonium chloride (NH 4 Cl) to fabricate bipolar plates. The obtained dense ACC has a thickness of ∼400 nm. Potentiodynamic and potentiostatic polarization tests demonstrated that the corrosion current density of ACC coated 316L steel was of the order of 10−7 A cm−2 in the simulated proton exchange membrane fuel cells (PEMFC) working environment, and the self-corrosion potential of the coating positively shifted by 0.4V, indicating a significant improvement on corrosion resistance of the coated steel plate due to excellent electrochemical stability of ACC. The Rockwell C indentation test showed that the as-obtained ACC was strongly bonded to the substrate and also had high in-plane strength. Further numerical simulation and comparison experiments showed that C was chemically bonded with Fe in the substrate, which was boosted by the assistance of NH 4 Cl. The intact and strong bonding between ACC and the substrate is highly helpful to improve corrosion resistance. The success in coating stainless steel plate with ACC by pulse electrodeposition method provides a promising alternation for coating of proton exchange membrane electrolyzer cell (PEMEC) and PEMFC metal bipolar plates. • Amorphous carbon coating (ACC) has prepared by electrodeposition on 316LSS. • The ACC was strongly bonded to the substrate and had high in-plane strength. • With the assistance of NH 4 Cl, C was chemically bonded with Fe in the substrate. [ABSTRACT FROM AUTHOR]

Red phosphorus for lithium-ion batteries (LIBs) is considered to be promising electrode material due to the high theoretical capacity and moderate working potential. However, the enormous volumetric expansion and intrinsic poor electrical conductivity result in poor interfacial stability and sluggish reaction kinetics. Herein, different functional conductive polymers are introduced to modify the interface, aiming to improve the interfacial compatibility and mechanical stability between red phosphorus and matrix materials. The Cobalt polyphthalocyanine (CoPPc)/polydopamine (PD) hybrid interface not only facilitates electron transfer within the system, but also accommodate the volume expansion of red phosphorus. Consequently, the novel P/CoPPc@PD anode achieves a stable specific capacity of 650 mAh g−1 after 580 cycles at 200 mA g−1, and a discharge capacity of 385 mAh g−1 at 5.0 A g−1 even after 10,000 cycles, demonstrating outstanding long-term cycling stability and rate performance. The synergistic interfacial effects of CoPPc and PD not only improve the conductivity of the anode material, but also constructs a mechanical buffering layer for the volume expansion of phosphorus. Hence, the rational design strategy of P/CoPPc@PD anode for LIBs reveals excellent cycle stability and promising application. [Display omitted] • Inorganic/organic hybrid interface was configured for red phosphorus. • CoPPc can facilitate the electron transport of red phosphorus anode. • The PD elastic buffer layer can alleviate the volume change of red phosphorus. • The CoPPc@PD hybrid layer improves the kinetics and structural integrity. [ABSTRACT FROM AUTHOR]