Investigation on micromorphology and electrochemical kinetics of La–Mg–Ni-based alloy chemically modified by nanopolypyrrole
Investigation on micromorphology and electrochemical kinetics of La–Mg–Ni-based alloy chemically modified by nanopolypyrrole
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DOI：
10.1007/s10008-015-2755-5
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发表时间：
2015-01
影响因子：
2.5
通讯作者：
Yunchai Wang;Yuan Li;Wenzhuo Shen;Yaru Pei;Jingjing Liu;Jerry Yinghui Che;Shu-qin Yang;Shumin Han-Sh
中科院分区：
文献类型：
--
作者：
Yunchai Wang;Yuan Li;Wenzhuo Shen;Yaru Pei;Jingjing Liu;Jerry Yinghui Che;Shu-qin Yang;Shumin Han-Sh
为了改善la - mg - ni基合金的电化学动力学，在la0.80 mg0.20 ni2.70 mn0.10 co0.55 al0.10合金颗粒表面进行了硫酸钠（Na2SO4）掺杂聚吡咯（PPy）的化学改性。SEM、TEM和FT-IR结果表明，在合金颗粒表面成功形成海绵状的纳米聚吡烯，且聚吡烯纳米颗粒分布均匀。由于纳米聚吡啶具有优异的电化学氧化还原可逆性、电催化活性和高电导率，使得合金电极的电化学动力学得到了显著改善。处理后的合金电极在1800 mA g−1下的高倍率放电能力（HRD）达到裸合金的2倍，放电电压明显升高。处理后合金电极的电荷转移电阻（Rct）显著降低；极限电流密度（IL）和氢扩散系数(D)增大。
In order to improve the electrochemical kinetics of La–Mg–Ni-based alloy, the chemical modification of polypyrrole (PPy) doped with sodium sulfate (Na2SO4) has been applied on the surface of the La0.80Mg0.20Ni2.70Mn0.10Co0.55Al0.10alloy particles. SEM, TEM, and FT-IR results indicate that the spongy nano-PPy successfully forms on the surface of the alloy particles and that the PPy nanoparticles distribute uniformly. Owing to the nano-PPy, which possesses excellent electrochemical redox reversibility, electrocatalytic activity, and high conductivity, electrochemical kinetics of the alloy electrode is remarkably ameliorated. The high-rate dischargeability (HRD) of the treated alloy electrode at 1800 mA g−1reaches two times of that for the bare alloy, meanwhile the discharge voltages increase obviously. The charge transfer resistance (Rct) of treated alloy electrode markedly decreases; the limiting current density (IL) and the hydrogen diffusion coefficient (D) increase.