Synthesis,Characterization and Properties of Bipolar Triphenylamine Charge Transport Materials

Four bipolar triphenylamine(TPA) charge transport materials were constructed by introducing imidazole and trifluoroacetyl groups into the TPA units, and characterized by the nuclear magnetic resonance spectrum(NMR) and mass spectrometry(MS). Among them, 4-(2-(1,3-trifluoroacetyl)imidazole)-phenyl-4,4?-di(4-methoxyphenyl)amine(2 Me OTPA-IOS, 1) was determined by X-ray single-crystal diffraction. The compound crystallizes in monoclinic system, space group P21/c with a = 24.338(5), b = 9.565(2), c = 11.456(2) ?, β = 99.427(3)°, Mr = 565.47, V = 2631.0(8) ?3,Z = 4,Dc = 1.428 g/cm3, μ = 0.125 mm–1, F(000) = 1160, the final R = 0.0559 and wR = 0.1265 for 5150 observed reflections with I 2σ(I). The optimized configurations of the target compounds were obtained by quantum chemical calculation, and the bipolarity of transportable holes and electrons was predicted by the frontier molecular orbital(HOMO and LUMO), which was further confirmed by the time of flight(TOF) method. In addition, the introduction of the terminal flexible chain enhances the solubility, thermal stability(DSC and TGA) and film-forming property of all compounds, and the frontier orbital energy of the solid film of the compounds was also tested(UV-vis and PYS). Thus, these compounds have the bipolarity of transportable holes and electrons and show good solubility and thermal stability.     

CuCo2O4/NiFe层状双金属氢氧化物核壳纳米花球阵列的高效析氧反应

采用界面工程策略在泡沫镍(NF)上制备了CuCo₂O₄/NiFe层状双金属氢氧化物(LDH)(CuCo₂O₄/NiFe-LDH@NF)核壳纳米花球阵列。研究表明,电子通过CuCo₂O₄和NiFe-LDH耦合界面发生转移,导致核心CuCo₂O₄处于富电子状态,从而提高了反应速率。非晶态NiFe-LDH外壳不仅为电子/物质提供更多的传输通道和增加活性位点。同时,还能在电催化析氧反应(OER)中保护核心CuCo₂O₄免受强碱腐蚀。因此,在1.0 mol·L^-1 KOH溶液中,将CuCo₂O₄/NiFe-LDH@NF用作OER催化剂时,仅需191mV的低过电位即可实现10 mA·cm^-2的电流密度和31 mV·dec^-1的低Tafel斜率。此外,CuCo₂O₄/NiFe-LDH@NF在长时间的工作中能够保证催化性能、晶体结构、形貌结构和组成的稳定。     

CuCo2O4/NiFe层状双金属氢氧化物核壳纳米花球阵列的高效析氧反应

采用界面工程策略在泡沫镍(NF)上制备了 CuCo₂O₄/NiFe 层状双金属氢氧化物(LDH) (CuCo₂O₄/NiFe-LDH@NF)核壳纳米花球阵列。研究表明,电子通过CuCo₂O₄和NiFe-LDH耦合界面发生转移,导致核心CuCo₂O₄处于富电子状态,从而提高了反应速率。非晶态NiFe-LDH外壳不仅为电子/物质提供更多的传输通道和增加活性位点。同时,还能在电催化析氧反应(OER)中保护核心 CuCo₂O₄免受强碱腐蚀。因此,在 1.0 mol·L^-1 KOH 溶液中,将 CuCo₂O₄/NiFe-LDH@NF 用作 OER 催化剂时,仅需 191mV 的低过电位即可实现 10 mA·cm^-2的电流密度和 31 mV·dec^-1的低 Tafel斜率。此外,CuCo₂O₄/NiFe-LDH@NF 在长时间的工作中能够保证催化性能、晶体结构、形貌结构和组成的稳定。