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Enhanced bifunctional catalytic activities of N-doped graphene by Ni in a 3D trimodal nanoporous nanotubular network and its ultralong cycling performance in Zn-air batteries
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作者 Yanyi Zhang Xiang-Peng Kong +7 位作者 Xiaorong Lin Kailong Hu Weiwei Zhao Guoqiang Xie Xi Lin Xingjun Liu yoshikazu ito Hua-Jun Qiu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第3期466-473,I0013,共9页
Free-standing and fexible air electrodes with long-lasting bifunctional activities for both the oxygen reduction reaction(ORR)and the oxygen evolution reaction(OER)are crucial to the development of wearable Zn-air rec... Free-standing and fexible air electrodes with long-lasting bifunctional activities for both the oxygen reduction reaction(ORR)and the oxygen evolution reaction(OER)are crucial to the development of wearable Zn-air rechargeable batteries.In this work,we synthesize a fexible air electrode consisting of 3D nanoporous N-doped graphene with trimodal shells and Ni particles through repeated chemical vapor deposition(CVD)and acidic etching processes.Our results indicate that such trimodal graphene morphology significantly enhances the active N-dopant sites and graphene-coated Ni surface,which consequentially boosts both the ORR and OER activities,as well as catalytic durability.First-principles density functional theory(DFT)calculations reveal the synergetic effects between the Ni and the N-doped graphene;namely,the Ni nanoparticles boost the bifunctional activities of the coated N-doped graphene,and in turn the graphene-covering layers enhance the stability of Ni.Thanks to the better protection from the triple graphene shells,our trimodal N-doped graphene/Ni-based Zn-air battery can be stably discharged/recharged beyond 2500 h with low overpotentials.It is reasonable to expect that such freestanding trimodal graphene/Ni would be promising in many fexible energy conversion/storage devices. 展开更多
关键词 Triple shells BIFUNCTIONAL Hierarchical Cycling durability ORR/OER
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彩色多普勒图像检测非环扎巩膜扣带术对球后血流动力学的影响
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作者 yoshikazu ito Mikio Sasoh +5 位作者 Masashi Ido Shunsuke Osawa Yoshikatsu Wakitani Yukitaka Uji 董白霞(译) 马景学(校) 《美国医学会眼科杂志(中文版)》 2006年第3期135-138,共4页
目的:采用彩色超声多普勒成像研究非环扎的节段性巩膜扣带术对球后血流动力学的影响。 方法:对单侧孔源性视网膜脱离而行巩膜扣带术的65例65只限。我们采用彩色超声多普勒成像技术。分别于术前、术后2周、12周、24周时对眼动脉、视... 目的:采用彩色超声多普勒成像研究非环扎的节段性巩膜扣带术对球后血流动力学的影响。 方法:对单侧孔源性视网膜脱离而行巩膜扣带术的65例65只限。我们采用彩色超声多普勒成像技术。分别于术前、术后2周、12周、24周时对眼动脉、视网膜中央动脉和睫状后短动脉的血流速度进行测量。应用彩色超声多普勒测量收缩期峰值血流速度(PSV)和舒张末期血流速度(EDV)(以厘米/秒计)。 结果:随访过程中眼动脉的PSV和EDV无显著变化。术后2周时视网膜中央动脉的PSV和EDV短暂性地降低,但是在术后12周时恢复到术前水平。两侧睫状后短动脉的PSV和EDV在术后持续降低。到术后24周时其血流速度降低的程度有统计学意义(扣带侧PSVP=0.001;EDVP=0.002;非扣带侧PSVP〈0.001;EDVP=0.004)。扣带侧睫状后短动脉的PSV和EDV降低与患者的年龄呈正相关(PSVR=0.40。P=0.001;EDVR=0.32P=0.008)。 结论:即使未采取环扎术,巩膜扣带术仍可以引起脉络膜血液循环的亚临床紊乱。年龄是其危险因素。 展开更多
关键词 球后血流动力学 巩膜扣带术 环扎术 彩色多普勒 图像检测 舒张末期血流速度 彩色超声多普勒 视网膜中央动脉
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