Trivalent lanthanide(Ln3+)ions doped luminescent nanocrystals(NCs),possessing fascinating optical properties such as sharp emission spectra and long-lived excited-state lifetime,have evoked much research interest for ...
详细信息
Trivalent lanthanide(Ln3+)ions doped luminescent nanocrystals(NCs),possessing fascinating optical properties such as sharp emission spectra and long-lived excited-state lifetime,have evoked much research interest for their potential applications in areas as diverse as biological detection and multiplexed *** particular,considerable success has recently been achieved in fine tuning the nanocrystal size,composition,crystal phase,morphology as well as emission color for a variety of Ln3+-doped luminescent NCs synthesized through different ***,many fundamental aspects like local crystal structure tailoring,energy transfer manipulating and optical performance enhancing in these Ln3+-doped NCs still lack sufficient understanding even for the well-developed NaYF4 and NaGdF4 nano-fluorides.
电催化氧还原反应(ORR)以及析氧反应(OER)是燃料电池中的重要半反应[1].我们选用空心介孔碳球为壳层,通过调控不同的投料比得到一种的以ZIF-67为核,介孔碳为壳的蛋黄壳结构催化剂ZIF@H30-25％.该催化剂可以在较低的过电位下实现ORR(EORR@-2.5 m A cm-2=0.823V)与OER(OER@10 m A cm-2=1.638V)反应,其双功能催化性能可以可同时媲美当前商用的Pt/C与IrO2,且较之有更为优越的催化稳定性.我们通过设计一系列的对比实验确定了蛋黄壳结构对催化活性的提升起到了重要的作用.
暂无评论