构建低成本、高性能的非贵金属催化剂对促进燃料电池的发展具有重要意义。本研究通过静电纺丝技术和溶剂热反应法,在纳米纤维上负载Co(OH)_(2)纳米片,并以之为硬模板转化为ZIF-67纳米片,接着采用高温热处理法,获得氮掺杂碳纳米纤维(NCNF...构建低成本、高性能的非贵金属催化剂对促进燃料电池的发展具有重要意义。本研究通过静电纺丝技术和溶剂热反应法,在纳米纤维上负载Co(OH)_(2)纳米片,并以之为硬模板转化为ZIF-67纳米片,接着采用高温热处理法,获得氮掺杂碳纳米纤维(NCNF)负载Co-N-C纳米片(Co-NS)的非贵金属催化剂。基于高导电的NCNF、丰富的Co-N-C活性物种和纳米片阵列结构优势,NCNF/Co-NS催化剂具有极好的氧还原(ORR)动力学。测试结果表明,在0.1 mol/L KOH溶液中,NCNF/Co-NS催化剂的起始电位和半波电位分别为0.9 V vs.RHE和0.83 V vs.RHE,可与Pt/C(0.92 V vs.RHE,0.85 V vs.RHE)媲美,并表现出远高于Pt/C的电化学稳定性和耐甲醇性能,使其在能源领域具有广阔的应用前景。展开更多
The resource comes from waste cupric liquor produced in the process of manufacturing printed circuit board(PCB). In the liquid phase, we get high pureness and excellent property nano Cu with the hydrazine dydrate as t...The resource comes from waste cupric liquor produced in the process of manufacturing printed circuit board(PCB). In the liquid phase, we get high pureness and excellent property nano Cu with the hydrazine dydrate as the reducer and the PVP and OP 10 as the dispersant. After the nano Cu is sensitized and acted, the nano Cu Ag Bimetallic Powders are got through 5% PVP and OP 10 are went into the plating solution and they are chemic plating. It is stated by the experimentation result that the powders can substitute Ag as the padding of conduction coating or shield coating.展开更多
实验研究了Al_2O_3-水纳米流体在泡沫金属填充管内的流动和传热特性,泡沫金属孔密度(pores per 0.0254m,PPI)为20~40,孔隙率为90%,Al_2O_3-水纳米流体的质量分数为0.1%~0.5%。实验结果表明:以压降为代价的前提下,泡沫金属与纳米流体相...实验研究了Al_2O_3-水纳米流体在泡沫金属填充管内的流动和传热特性,泡沫金属孔密度(pores per 0.0254m,PPI)为20~40,孔隙率为90%,Al_2O_3-水纳米流体的质量分数为0.1%~0.5%。实验结果表明:以压降为代价的前提下,泡沫金属与纳米流体相结合的方式总是能显著强化传热。相同工况下,更大的PPI可以提高努塞尔数。去离子水工况下,40PPI泡沫金属对流换热效果最好,努塞尔数最大提高650%。泡沫金属PPI越大,压降增加越多,40 PPI泡沫金属的压降是光管的19倍。相比20 PPI泡沫金属,30 PPI的泡沫金属使努塞尔数最多提高15%,压降增加5%;40 PPI的泡沫金属可以使努塞尔数最多提高38%,压降增加38%。纳米流体的质量分数也对流动和传热有重要影响。根据实验数据开发了适用于纳米流体在泡沫金属强化管内的传热及流动的关联式。展开更多
文摘构建低成本、高性能的非贵金属催化剂对促进燃料电池的发展具有重要意义。本研究通过静电纺丝技术和溶剂热反应法,在纳米纤维上负载Co(OH)_(2)纳米片,并以之为硬模板转化为ZIF-67纳米片,接着采用高温热处理法,获得氮掺杂碳纳米纤维(NCNF)负载Co-N-C纳米片(Co-NS)的非贵金属催化剂。基于高导电的NCNF、丰富的Co-N-C活性物种和纳米片阵列结构优势,NCNF/Co-NS催化剂具有极好的氧还原(ORR)动力学。测试结果表明,在0.1 mol/L KOH溶液中,NCNF/Co-NS催化剂的起始电位和半波电位分别为0.9 V vs.RHE和0.83 V vs.RHE,可与Pt/C(0.92 V vs.RHE,0.85 V vs.RHE)媲美,并表现出远高于Pt/C的电化学稳定性和耐甲醇性能,使其在能源领域具有广阔的应用前景。
文摘The resource comes from waste cupric liquor produced in the process of manufacturing printed circuit board(PCB). In the liquid phase, we get high pureness and excellent property nano Cu with the hydrazine dydrate as the reducer and the PVP and OP 10 as the dispersant. After the nano Cu is sensitized and acted, the nano Cu Ag Bimetallic Powders are got through 5% PVP and OP 10 are went into the plating solution and they are chemic plating. It is stated by the experimentation result that the powders can substitute Ag as the padding of conduction coating or shield coating.
