CAJ | 학술논문

针对PEMWE阳极催化剂,对具有多孔结构和较高比表面积的纳米TiC采用控制氧化进程的方法,进行了表面物相和微孔结构改性,形成多孔结构的TiC-TiO_2壳-芯复合物,并以处理后的TiO_2-TiC原位复合物作为载体,制成了具有高活性的负载型催化剂.通过X射线衍射光谱法(XRD),布鲁瑙尔-埃利特-特勒法(BET)和透射电子显微镜法(TEM)等多种表征方法,证明了改性后的TiC-TiO_2比表面积比TiC增加了2倍以上,具有多矿相复合结构.循环伏安测试表明,Ir/TiC催化剂的析氧峰值电流是Ir黑的5倍,而经过改性后的TiC-TiO_2负载的Ir催化剂则是Ir/TiC催化剂的析氧峰值电流的6倍.很明显改性后的TiO_2-TiC原位复合物具有更大的比表面积和孔体积,更好地分散了贵金属Ir,大大提高了析氧反应的催化活性.
침대PEMWE양겁최화제,대구유다공결구화교고비표면적적납미TiC채용공제양화진정적방법,진행료표면물상화미공결구개성,형성다공결구적TiC-TiO_2각-심복합물,병이처리후적TiO_2-TiC원위복합물작위재체,제성료구유고활성적부재형최화제.통과X사선연사광보법(XRD),포로노이-애리특-특륵법(BET)화투사전자현미경법(TEM)등다충표정방법,증명료개성후적TiC-TiO_2비표면적비TiC증가료2배이상,구유다광상복합결구.순배복안측시표명,Ir/TiC최화제적석양봉치전류시Ir흑적5배,이경과개성후적TiC-TiO_2부재적Ir최화제칙시Ir/TiC최화제적석양봉치전류적6배.흔명현개성후적TiO_2-TiC원위복합물구유경대적비표면적화공체적,경호지분산료귀금속Ir,대대제고료석양반응적최화활성.
Phase compositions and microstructure of TiC with high specific surface area and porous structures were modified by controlling its oxidation process in order to prepare porous TiC-TiO_2 shell-core composite, which was used as the support for anode electrocatalyst in proton exchange membrane water electrolyzer. Through XRD, BET and TEM characterization methods, BET surface area of the modified TiC was increased by more than 2 times and a multiple phase structure was formed. Cyclic voltammograms (CVs) reveals that the peak current density at 1.5 V vs. SCE on the Ir/TiC is about five times of that on the unsupported Ir black catalyst, and one on Ir/(TiC-TiO_2) (the modified TiC) is about six times of that on Ir/TiC. It is obvious that the processed TIC (TiC-TiO_2 composite) is better for dispersing precious metals and so its catalytic activity is higher for the oxygen evolution reaction (OER).