CN108722415B - 一种纳米棒定向组装的Co枝晶电催化剂及其制备方法 - Google Patents
一种纳米棒定向组装的Co枝晶电催化剂及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种纳米棒定向组装的Co枝晶电催化剂及其制备方法。是由纳米棒定向组装而成的微米枝晶,微米枝晶的尺寸为5~15μm,纳米棒的长度为3~10μm,直径为0.3~1μm。配置均三苯甲酸和二氧化钛P25的乙醇水溶液,搅拌至溶液均一;加入水热反应釜升温80‑120℃水热反应12‑24h,然后洗涤,烘干得到修饰的二氧化钛P25;加入到六水合氯化钴水溶液中,搅拌并加入氢氧化钠水溶液、水合肼;加入水热反应釜中,150‑200℃水热反应0.5‑1.5h。本发明获得的纳米棒定向组装的Co树枝状晶体可提高材料活性位点的暴露比例,促进电析氧进程,为通常Co金属材料的结构和应用范围的拓展提供了新思路。
Description
技术领域
本发明属于无机化学合成技术领域,具体涉及一种由纳米棒定向组装的Co枝晶电催化剂材料及其制备方法。
背景技术
随着能源需求与日俱增,环境日益恶化,亟待发展可持续、无化石燃料;电解水受到国内外电催化界的极大关注,然而产氧半反应比产氢半反应慢,制约了电解水的发展。虽然Ru和Ir基催化剂具有优良的电解水产氧性能;但是Ru和Ir在地球中的含量稀少,价格昂贵,限制了Ru和Ir基基催化材料的实际应用。对于过渡金属Co等非Pt材料,其储量丰富,价格便宜,具有良好的电析氧性能。纳米级的Co金属颗粒具有良好的电催化产氧能力,但是长期稳定性差,容易团聚;微米块体Co金属,由于比表面积小,暴露的产氧活性位点少,导致较差的产氧性能。因此Co类过渡金属的氧化物,磷化物,氮化物等被广大学者研究。
发明内容
本发明目的在于提供一种纳米棒定向组装的Co枝晶电催化剂及其制备方法,制备方法简单,且产量大,在修饰过的二氧化钛P25的诱导下,形成纳米棒定向组装Co枝晶电催化剂材料。
为达到上述目的,采用技术方案如下:
一种纳米棒定向组装的Co枝晶电催化剂,所述Co枝晶电催化剂是由纳米棒定向组装而成的微米枝晶,微米枝晶的尺寸为5~15μm,纳米棒的长度为3~10μm,直径为0.3~1μm。
上述纳米棒定向组装的Co枝晶电催化剂的制备方法,包括以下步骤:
1)配置均苯三甲酸和二氧化钛P25的乙醇水溶液,搅拌至溶液均一;加入水热反应釜升温至80-120℃水热反应12-24h,然后洗涤,烘干得到修饰的二氧化钛P25;
2)在六水合氯化钴水溶液中,加入所得修饰的二氧化钛P25,搅拌并加入氢氧化钠水溶液,再加入水合肼,搅拌至溶液均一;
3)加入水热反应釜中,150-200℃水热反应0.5-1.5h。
按上述方案,所述的六水合氯化钴水溶液的浓度为0.1mol/L,氢氧化钠水溶液的浓度为25mol/L。
按上述方案,步骤2中二氧化钛P25的浓度为0.01~0.156mol/L,水合肼的浓度为2.5mol/L。
上述纳米棒定向组装的Co枝晶电催化剂作为电化学析氧催化剂的应用。
本发明的有益效果:
本发明首先通过将适量的经过修饰的二氧化钛P25放入溶液中,控制体系中二氧化钛P25的含量;然后加入一定水合肼用量,经水热反应,并控制水热温度和水热时间,最终可形成具有纳米棒定向组装的Co树枝状微晶,具有结构稳定性。
本发明获得的纳米棒定向组装的Co树枝状晶体可提高材料活性位点的暴露比例,促进电析氧进程,为通常Co金属材料的结构和应用范围的拓展提供了新思路。
附图说明
图1:实施例1中制得纳米棒定向组装的Co枝晶电催化剂的XRD图。
图2:实施例1中制得纳米棒定向组装的Co枝晶电催化剂的SEM图。
图3:实施例1中制得纳米棒定向组装的Co枝晶电催化剂的OER图。
图4:实施例2中制得纳米棒定向组装的Co枝晶电催化剂的XRD图。
图5:实施例2中制得纳米棒定向组装的Co枝晶电催化剂的SEM图。
图6:实施例2中制得纳米棒定向组装的Co枝晶电催化剂的OER图。
图7:实施例3中制得纳米棒定向组装的Co枝晶电催化剂的XRD图。
图8:实施例3中制得纳米棒定向组装的Co枝晶电催化剂的SEM图。
图9:实施例3中制得纳米棒定向组装的Co枝晶电催化剂的OER图。
具体实施方式
以下实施例进一步阐释本发明的技术方案,但不作为对本发明保护范围的限制。
实施例1:
(1)称取3.0g均苯三甲酸和0.6g二氧化钛P25,将两者一起溶解在由5ml乙醇和10ml去离子水配制的溶液中,搅拌至溶液均一;
(2)将制备好的溶液倒入干净的水热反应釜中,100℃水热反应24h,然后洗涤,烘干;
(3)分别配置0.1mol/L六水合氯化钴水溶液,25mol/L氢氧化钠水溶液;
(4)量取10ml在步骤(3)得到的六水合氯化钴水溶液于烧杯中,加入150mg在步骤(2)得到的二氧化钛P25,搅拌获得均一溶液后再加入0.5ml步骤(3)得到的氢氧化钠水溶液,搅拌获得均一溶液后再加入1.5ml水合肼,搅拌至溶液均一;
(5)将制备好的溶液倒入干净的水热反应釜中,200℃水热反应1.5h。
本实施例所得纳米棒定向组装的Co枝晶的X射线衍射图见图1。根据XRD图,我们可以清晰看到二氧化钛和钴的衍射峰,而且二氧化钛P25衍射峰很强,说明含量比较多。
SEM图见图2,产物为纳米棒定向组装的枝晶,微米枝晶的尺寸为5~15μm,纳米棒的长度为3~10μm,直径为0.3~1μm;从SEM图中可以看到大量的25nm的二氧化钛P25颗粒存在。
在碱溶液体系中对催化剂材料进行电化学性能测试,得到OER图如图3所示。在10mA/cm2处所对应的电压值为1.686V,过电位为456mV,其过电位较大的原因是二氧化钛P25含量过多,覆盖了Co枝晶的活性位点。
实施例2:
(1)称取3.0g均苯三甲酸和0.6g二氧化钛P25,将两者一起溶解在由5ml乙醇和10ml去离子水配制的溶液中,搅拌至溶液均一;
(2)将制备好的溶液倒入干净的水热反应釜中,100℃水热反应24h,然后洗涤,烘干;
(3)分别配置0.1mol/L六水合氯化钴水溶液,25mol/L氢氧化钠水溶液;
(4)量取10ml在步骤(3)得到的六水合氯化钴水溶液于烧杯中,加入50mg在步骤(2)得到的P25,搅拌获得均一溶液后再加入0.5ml步骤(3)得到的氢氧化钠水溶液,搅拌获得均一溶液后再加入1.5ml水合肼,搅拌至溶液均一;
(5)将制备好的溶液倒入干净的水热反应釜中,200℃水热反应1.5h。
本实施例纳米棒定向组装的Co枝晶的X射线衍射图见图4。根据XRD图可知,当修饰过的二氧化钛P25用量减少时,XRD衍射峰明显变弱,但是依然可以看到二氧化钛P25的衍射峰。
SEM图见图5,产物为纳米棒定向组装的枝晶,微米枝晶的尺寸为5~15μm,纳米棒的长度为3~10μm,直径为0.3~1μm。
在碱溶液体系中对催化剂材料进行电化学性能测试,得到OER图如图6所示。在10mA/cm2处所对应的电压值为1.665V,过电位为435mV,其过电位依然较大,需要继续降低二氧化钛P25用量。
实施例3:
(1)称取3.0g均苯三甲酸和0.6g二氧化钛P25,将两者一起溶解在由5ml乙醇和10ml去离子水配制的溶液中,搅拌至溶液均一;
(2)将制备好的溶液倒入干净的水热反应釜中,100℃水热反应24h,然后洗涤,烘干;
(3)分别配置0.1mol/L六水合氯化钴水溶液,25mol/L氢氧化钠水溶液;
(4)量取10ml在步骤(3)得到的六水合氯化钴水溶液于烧杯中,加入10mg在步骤(2)得到的P25,搅拌获得均一溶液后再加入0.5ml步骤(3)得到的氢氧化钠水溶液,搅拌获得均一溶液后再加入1.5ml水合肼,搅拌至溶液均一;
(5)将制备好的溶液倒入干净的水热反应釜中,200℃水热反应1.5h。
本实施例纳米棒定向组装的Co枝晶的X射线衍射图见图7。根据XRD图可知,当修饰过的二氧化钛P25用量减少为10mg时,XRD衍射峰明显消失,但是依然可以看到很弱的二氧化钛P25的衍射峰。
SEM图见图8,产物为纳米棒定向组装的枝晶,微米枝晶的尺寸为5~15μm,纳米棒的长度为3~10μm,直径为0.3~1μm。
在碱溶液体系中对催化剂材料进行电化学性能测试,得到OER图如图9所示。在10mA/cm2处所对应的电压值为1.657V,过电位为427mV,其过电位依然较大,需要继续降低二氧化钛P25用量。
实施例4:
(1)称取3.0g均苯三甲酸和0.6g二氧化钛P25,将两者一起溶解在由5ml乙醇和10ml去离子水配制的溶液中,搅拌至溶液均一;
(2)将制备好的溶液倒入干净的水热反应釜中,80℃水热反应24h,然后洗涤,烘干;
(3)分别配置0.1mol/L六水合氯化钴水溶液,25mol/L氢氧化钠水溶液;
(4)量取10ml在步骤(3)得到的六水合氯化钴水溶液于烧杯中,加入10mg在步骤(2)得到的P25,搅拌获得均一溶液后再加入0.5ml步骤(3)得到的氢氧化钠水溶液,搅拌获得均一溶液后再加入1.5ml水合肼,搅拌至溶液均一;
(5)将制备好的溶液倒入干净的水热反应釜中,200℃水热反应0.5h。
实施例5:
(1)称取3.0g均苯三甲酸和0.6g二氧化钛P25,将两者一起溶解在由5ml乙醇和10ml去离子水配制的溶液中,搅拌至溶液均一;
(2)将制备好的溶液倒入干净的水热反应釜中,120℃水热反应12h,然后洗涤,烘干;
(3)分别配置0.1mol/L六水合氯化钴水溶液,25mol/L氢氧化钠水溶液;
(4)量取10ml在步骤(3)得到的六水合氯化钴水溶液于烧杯中,加入10mg在步骤(2)得到的P25,搅拌获得均一溶液后再加入0.5ml步骤(3)得到的氢氧化钠水溶液,搅拌获得均一溶液后再加入1.5ml水合肼,搅拌至溶液均一;
(5)将制备好的溶液倒入干净的水热反应釜中,150℃水热反应1.5h。
Claims (1)
1.一种纳米棒定向组装的Co枝晶电催化剂的制备方法,其特征在于包括以下步骤:
1)配置均苯三甲酸和二氧化钛P25的乙醇水溶液,搅拌至溶液均一;加入水热反应釜升温至80-120℃水热反应12-24h,然后洗涤,烘干得到修饰的二氧化钛P25;
2)在浓度为0.1mol/L的六水合氯化钴水溶液中,加入所得修饰的二氧化钛P25,搅拌并加入25mol/L的氢氧化钠水溶液,再加入水合肼,搅拌至溶液均一;其中,修饰的二氧化钛P25的浓度为0.01~0.156mol/L,水合肼的浓度为2.5mol/L;
3)加入水热反应釜中,150-200℃水热反应0.5-1.5h;所得Co枝晶电催化剂是由纳米棒定向组装而成的微米枝晶,微米枝晶的尺寸为5~15μm,纳米棒的长度为3~10μm,直径为0.3~1μm。
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CN101544408A (zh) * | 2009-04-17 | 2009-09-30 | 中国科学院上海硅酸盐研究所 | 水热法制备层片状Co(OH)2或Co3O4纳米棒的方法 |
CN103774218A (zh) * | 2014-02-13 | 2014-05-07 | 中国计量学院 | 一种钴纳米枝晶的可控制备方法 |
CN105252017A (zh) * | 2015-11-12 | 2016-01-20 | 沈阳工业大学 | 一种二维片状组成单元自组装成三维树枝状磁性金属钴纳米材料 |
CN105540827A (zh) * | 2015-12-17 | 2016-05-04 | 山东大学 | 一种基于表面定向生长纳米棒的分等级二氧化钛微球填料的制备方法 |
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CN103774218A (zh) * | 2014-02-13 | 2014-05-07 | 中国计量学院 | 一种钴纳米枝晶的可控制备方法 |
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