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Role of graphene in improving catalytic behaviors of AuNPs/MoS2/Gr/Ni-F structure in hydrogen evolution reaction
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Xian-Wu Xiu 《中国物理 B》2021,30(8):88801-088801
The efficient production of hydrogen through electrocatalytic decomposition of water has broad prospects in modern energy equipment. However, the catalytic efficiency and durability of hydrogen evolution catalyst are still very deficient, which need to be further explored. Here in this work, we prove that introducing a graphene layer (Gr) between the molybdenum disulfide and nickel foam (Ni-F) substrate can greatly improve the catalytic performance of the hybrid. Owing to the excitation of local surface plasmon resonance (LSPR) of gold nanoparticles (NPs), the electrocatalytic hydrogen releasing activity of the MoS2/Gr/Ni-F heterostructure is greatly improved. This results in a significant increase in the current density of AuNPs/MoS2/Gr/Ni-F composite material under light irradiation and in the dark at 0.2 V (versus reversible hydrogen electrode (RHE)), which is much better than in MoS2/Gr/Ni-F composite materials. The enhancement of hydrogen release can be attributed to the injection of hot electrons into MoS2/Gr/Ni-F by AuNPs, which will improve the electron density of MoS2/Gr/Ni-F, promote the reduction of H2O, and further reduce the activation energy of the electrocatalyst hydrogen evolution reaction (HER). We also prove that the introduction of graphene can improve its stability in acidic catalytic environments. This work provides a new way of designing efficient water splitting system. 相似文献
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APA微囊化人工细胞治疗疾病的研究 总被引:5,自引:1,他引:4
作为免疫隔离屏障的微囊技术为克服组织细胞移植治疗疾病研究中的免疫排斥反应和移植物来源稀少提供了新途径.海藻酸钠-聚赖氨酸-海藻酸钠(APA)微囊化牛肾上腺髓质嗜铬细胞移植治疗帕金森病和疼痛及微囊化胰岛移植治疗糖尿病的动物实验和临床研究,及其他研究者对微囊化胰岛移植治疗糖尿病、微囊化甲状旁腺细胞移植治疗甲状旁腺功能低下等方面的研究,均明确表明APA微囊可成功地克服组织细胞移植中的免疫排斥反应,使异种移植物的应用成为可能,极大地扩展了移植物的来源.临床应用微囊化人工细胞治疗糖尿病、帕金森病等神经/内分泌疾病将得以实现.同时,也将为体细胞基因治疗提供有效的工具. 相似文献
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为了研究19F-NMR波谱分析胞嘧啶脱氨酶(CD)基因在人结肠癌细胞中表达的可行性,通过逆转录病毒介导方法,将编码大肠杆菌的CD基因转染到人结肠癌细胞系SW1116. 通过RT-PCR、MTT方法和19F-NMR波谱分析了CD基因在人结肠癌细胞中的表达状况. 结果显示转基因的肿瘤细胞SWCD2中表达CD基因,对前药5-氟胞嘧啶(5-FC)的敏感性较亲本肿瘤细胞SW1116明显增高,50%细胞生长抑制率(IC50)为66 μmol/L, 而SW1116 细胞IC50为16 mmol/L. 19F-NMR波谱分析显示,转导CD基因细胞在774 μmol/L 5-FC浓度培养24 h后的样品,在δ -91.7和δ -93.3显示了2个双峰,分别是5-FC和5-氟尿嘧啶(5-FU)的19F-NMR的信号,提示5-FU是SWCD2细胞内的CD酶催化5-FC的代谢产物. 这些结果表明19F-NMR分析是一种能够用于检测CD基因在人结肠癌细胞中表达的新方法,它将有助于对临床基因治疗方案实施监测. 相似文献
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以PWM脉冲宽度调制方式为对象,提出了一种在微处理器CPU控制下,用Intel8253可编程序定时器实现数字控制的调宽脉冲生成的方法.该方法可在计算机控制下,由接口芯片产生PWM波,不需要经过D/A转换、三角波发生器和脉宽调制等模拟信号处理的复杂环节. 相似文献
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