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    CdPS 3 nanosheets-based membrane with high proton conductivity enabled by Cd vacancies
    Science (2020)
    Xitang QianLong ChenLichang YinZhibo LiuSongfeng PeiFan LiGuangjin HouShuangming ChenLi SongKhalid Hussain TheboHui‐Ming ChengWencai Ren
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    Abstract:
    Vacancies enhance proton conductivity Proton-exchange membranes (PEMs) allow for the transport of protons while acting as electrical insulators and ensuring that reactants are kept apart; therefore, they are a key component in devices such as low-temperature fuel cells. PEMs are typically made from polymers or materials embedded in a polymer matrix and need to operate in conditions of very high humidity. Starting with an inorganic, layered material, CdPS 3 , Qian et al. show that the removal of a small amount of cadmium introduces vacancies that greatly increase the proton conductivity of the PEMs (see the Perspective by Wang and He). The process works for manganese-based membranes as well, and high lithium ion transport was also observed. Science , this issue p. 596 ; see also p. 525
    Keywords:
    Proton Transport
    Topics:
    Fuel Cells and Related Materials
    Advanced Battery Materials and Technologies
    Advancements in Battery Materials
    High Proton Conductivity Achieved by the Self-Assembly of POM-Based Acid–Base Adduct in SBA-15 over a Wide Range from −40 to 85 °C
    ACS Applied Energy Materials (2020)
    Xiuwei SunShumei LiuShan ZhangTian‐Yi DangHong‐Rui Tian
    Almost all proton-conducting materials display poor conductivity at subzero temperatures, which significantly limits their application in cold regions. Thus, effective strategies to achieve high proton conductivity in a wide range from subzero to medium temperatures (−40 to 85 °C) need to be developed. Herein, we prepared proton-conductive materials by encapsulating the acid–base adduct based on Keggin-type H3PW12O40 (HPW) and aminoethanesulfonic acid (C2H7O3NS, HSN) in the linear channels of SBA-15 (named HPW-HSN@SBA-15). The result is the same as we expected: HPW-HSN@SBA-15 exhibits high proton conductivity over a wide temperature range (−40 to 85 °C). The proton conductivity of 75 wt % HPW-HSN@SBA-15 (3HPW-HSN@SBA-15) reaches 0.16 S cm–1 at 85 °C, 97% relative humidity (RH), and 6.8 × 10–5 S cm–1 at −40 °C. The excellent proton conductivity at subzero temperature of HPW-HSN@SBA-15 is mainly attributed to the ultrafast proton transfer with low energy barrier between proton donor (acid group) and proton acceptor (base group) in acid–base adduct without the attendance of water. Furthermore, the proton conductivity cycle test of 3HPW-HSN@SBA-15 demonstrates its good durability and stability.
    Proton Transport
    Base (topology)
    Atmospheric temperature range
    Citations (35)