CN109126781B - 一种超薄的RhPdH纳米片材料及其制备方法与应用 - Google Patents
一种超薄的RhPdH纳米片材料及其制备方法与应用 Download PDFInfo
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- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/46—Ruthenium, rhodium, osmium or iridium
- B01J23/464—Rhodium
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Abstract
本发明公开了一种超薄的RhPdH纳米片的制备及其在电催化析氢方面的应用。RhPdH纳米片的尺寸范围为200~325nm,其厚度范围为1.5~2nm。该材料通过一步溶剂热法成功制备,Rh(acac)3和Pd(acac)2为前驱体盐,甲醛为溶剂,聚乙烯吡咯烷酮为表面覆盖剂,并在此基础上引入CO气体,得到了纯净的超薄RhPdH纳米片结构。并对其进行了电催化析氢性能的研究,RhPdH纳米片表现出优良的电催化析氢性能,同时表现了超高的电催化析氢稳定性。
Description
技术领域
本发明属于清洁可持续新型能源制备应用领域,特别涉及一种超薄的RhPdH纳米片材料及其制备方法与应用。
背景技术
贵金属不同晶面对于催化活性的影响巨大,使高催化活性的晶面裸露在外成为研究的热点,于是贵金属的形貌调控应运而生。比如,当裸露晶面是(111)面时,往往呈现四面体或八面体的形貌,当(100)晶面裸露在外时呈现的是立方体的形貌。正是由于不同的裸露晶面构筑了贵金属纳米材料千姿百态的形貌。
经过几十年的发展与进步,在贵金属以及非贵金属的形貌调控方面取得了巨大的突破,一维的纳米棒,纳米线,二维的纳米片,纳米盘,三维的纳米立方体、四面体、截角八面体等形貌被成功地制备出来,使得这个大家族逐渐丰富。
二维材料由于具有高的电子迁移率、量子霍尔效应、优良的热导率以及超导性能,成为形貌调控的重点,受到研究者的广泛关注。人们又将二维材料分为层状二维材料和非层状二维材料,层状二维材料包括石墨烯、六方氮化硼、黑磷、MOFs、COFs、MXenes、MoS2等,它们具有强的层内化学键和弱的层间范德华键,具有轻微的晶格扭曲,而非层状二维材料主要包括金属及其合金,它们在三个维度方向上都具有强的化学键,并且有明显的晶格扭曲,表面原子处于低配位状态且拥有丰富的表面悬键,这赋予它优异的催化性能。
非层状二维材料的目前为止合成出的种类不多,主要集中在金属及其合金。单金属纳米片Pd、Rh、Ru、Au、Ir,双金属合金纳米片PtCu、PdCu、RhW,多金属纳米片PtAgCo、PdPtAg、PdCuBiMn等都有所报道。
PdH由于具有表面自清洁的特点,且H原子嵌入Pd的晶格使其催化活性大幅度提高,引起了研究人员的广泛关注。由于H原子进入Pd的晶格造成其对CO气体分子的吸附能力下降,使得对形貌的调控能力大大降低,很难形成纳米片的结构,文献中所涉及的形貌都是纳米粒子。所以要想进一步提高该体系的催化活性,必须使其表面积进一步增大,暴露更多的活性位点。由于二维片层材料本身特有的比表面积大的特点,是我们研究努力的方向。
本发明通过合理的设计,突破了现有技术的难题,通过引入Rh元素,形成氢化金属合金纳米片结构。
发明内容
本发明的目的在于针对现有技术的不足,提供一种超薄的RhPdH纳米片材料合成方法及其制备方法与应用。
本发明的目的是通过以下技术方案实现的:一种超薄的RhPdH纳米片电催化析氢材料,Rh、Pd、H三元素组成面心立方的合金结构,纳米片尺寸范围为200~325nm,厚度范围为1.5~2nm。
一种上述超薄的RhPdH纳米片电催化析氢材料的制备方法,包括以下步骤:
(1)称取前驱体盐Rh(acac)3和Pd(acac)2各6~10mg溶解在5~10mL的甲醛溶剂中,同时加入聚乙烯吡咯烷酮110~130mg,置于室温搅拌均匀,待前驱体盐完全溶解,形成均匀的浅黄色溶液。
(2)将上述溶液转移至水热釜中,通入一定量的CO气体,使溶液中CO气体饱和,将水热釜密封,置于马弗炉中在160℃反应6~8h。
(3)待上述混合溶液冷却到室温,用丙酮和乙醇的混合溶液进行离心、洗涤,得到超薄的RhPdH纳米片电催化析氢材料。
上述超薄RhPdH纳米片材料在电催化析氢反应中的应用。
本发明的有益效果是:
(1)本发明公开的超薄RhPdH纳米片电催化析氢材料,H原子进入RhPd合金的晶格,活化了RhPd合金的电催化析氢性能。通过引入Rh元素,调节了Pd对CO气体的吸附能力,形成了超薄RhPdH纳米片结构。超薄的RhPdH纳米片材料特有的片层结构,与其他形貌相比,拥有更大的比表面积,暴露更多的催化活性位点,使其电催化析氢性能进一步提高。
(2)采用简单的一步溶剂热法实现制备,旨在提供一种产率较高、方法简易、具有较优越电催化析氢催化性能的RhPdH纳米片的合成方法。其中,甲醛溶剂分解产生CO和H2,氢渗入铑钯合金的晶格,形成RhPdH合金,而CO气体起着形貌调控的作用,由于甲醛溶剂产生的CO气体不足,故再通入CO气体,使甲醛溶剂中CO气体饱和,加之聚乙烯吡咯烷酮的塑形作用,最终形成超薄的RHPdH纳米片结构。
附图说明
图1是本发明制备的超薄RhPdH纳米片的XRD图。
图2是本发明制备的超薄RhPdH纳米片材料的形貌图。a为超薄RhPdH纳米片的扫描电子显微镜图,b为超薄RhPdH纳米片的透射电子显微镜图,c为超薄RhPdH纳米片的高分辨透射电子显微镜图。
图3是本发明制备的超薄RhPdH纳米片边缘立起的高分辨透射电子显微镜图。
图4是本发明制备的超薄RhPdH纳米片的EDS图。
图5是为制备过程中未通入CO气体,其他条件保持不变的高分辨透射电子显微镜图。
图6是本发明制备的超薄RhPdH纳米片材料马弗炉中反应4h和马弗炉中反应6h的XRD对比图。分别以RhPdH-4、RhPdH-6表示马弗炉中反应4h和马弗炉中反应6h的超薄RhPdH纳米片。
图7是本发明制备的超薄RhPdH纳米片材料在1M氢氧化钾溶液中电催化析氢的极化曲线(Polarization curves),分别与Rh/C、Pt/C以及Rh nanosheets进行对比。
图8是本发明制备的超薄RhPdH纳米片材料在1M氢氧化钾中的稳定性测试曲线(Durability test)。
图9是本发明制备的超薄RhPdH纳米片材料析氢反应后与析氢反应前的XRD对比图。
具体实施方式
以下结合附图和实施例进一步说明本发明。
实施例1
本实施例制备超薄RhPdH纳米片材料,具体包括以下步骤:
(1)称取前驱体盐Rh(acac)3和Pd(acac)2各8mg溶解在6mL的甲醛溶剂中,同时加入聚乙烯吡咯烷酮120mg,置于室温剧烈搅拌1h,待前驱体盐完全溶解,形成均匀的浅黄色溶液。
(2)将上述溶液转入10mL的水热釜中,控制CO的流量为500mL min-1,连续通入8min,使溶液中CO气体饱和,将水热釜密封,置于马弗炉中在160℃反应6h。
(3)待上述混合溶液冷却到室温,用丙酮和乙醇的混合溶液进行离心、洗涤,反复操作5次,将得到的产物溶解在4mL乙醇中,备用。
图1是本发明制备的超薄RhPdH纳米片的XRD图。由XRD图可以看出相较Pd和Rh的标准PDF卡片,该衍射峰有明显的左移,说明了该材料并非单纯的RhPd合金,而是二者的氢化合金。
图2为本发明制备的超薄RhPdH纳米片的形貌谱图,图2a,图2b分别为本发明制备的超薄RhPdH纳米片扫描电子显微镜图和透射电子显微镜图,可以明显地看出为薄片结构。图2c为本发明制备的超薄RhPdH纳米片的高分辨透射电子显微镜图,晶面间距为0.236nm,对应RhPdH纳米片的(111)面,相对于RhPd合金(111)面的晶面间距有明显的晶格膨胀,并且与XRD图谱完全吻合。
图3为本发明制备的超薄RhPdH纳米片翘起边缘的高分辨透射电子显微镜图,其可以直观地反映RhPdH纳米片厚度,大约为1.652nm。
图4为本发明制备的超薄RhPdH纳米片的EDS图,Pd、Rh元素的比例为44.9:55.1。
图5为在合成过程中保持其它条件不变的情况下,不通CO气体的透射电子显微镜图,所得到的纳米片含有较多的颗粒杂质,并非纯净的纳米片结构。
图6为本发明制备的超薄RhPdH纳米片的XRD图,同时也给出了马弗炉中反应4h的XRD对比图,可以看出两者的氢化程度不同,马弗炉中反应6h超薄RhPdH纳米片的氢化程度更高。
用本实施例所制备的超薄RhPdH纳米片材料进行电催化析氢性能测试,主要步骤如下:
将实施例所制备的超薄RhPdH纳米片材料滴到玻碳电极上,通过ICP-MS测试,保证其负载量为15微克每平方厘米,以玻碳电极为工作电极(WE)、饱和银/氯化银电极为参比电极(RE)、铂片为对电极(CE)组成三电极体系,以1M氢氧化钾为电解液。在进行电化学测试前,通入饱和氮气,除去溶液中的氧气。并对电极进行校准E(RHE)=E(Ag/AgCl)+0.059pH+0.197V。并在保证贵金属负载量一致的情况下,马弗炉中反应6h超薄RhPdH纳米片材料Rh/C、Pt/C、Rh nanosheets以及马弗炉中反应4h的超薄RhPdH纳米片材料进行电催化析氢性能的对比。
图7为不同催化剂的催化析氢性能比较,电流密度为10mA/cm2,RhPdH-6的过电势为-54mv,明显优于其它材料的性能。
图8为RhPdH-6在-0.9V~-1.6V vs Ag/AgCl进行循环伏安稳定性测试,发现循环5000圈后材料的活性基本没有降低,说明了RhPdH-6材料超高的电催化析氢活性。
图9为超薄RhPdH纳米片材料析氢反应前后的XRD对比图,发现超薄RhPdH纳米片中的H并未脱出,更加证明了该材料的超高稳定性。
实施例2
(1)称取前驱体盐Rh(acac)3 10mg,Pd(acac)2 6mg溶解在8mL的甲醛溶剂中,同时加入聚乙烯吡咯烷酮110mg,置于室温搅拌1h,待前驱体盐完全溶解,形成均匀的浅黄色溶液。
(2)将上述溶液转入20mL的水热釜中,控制CO的流量为400mL min-1,连续通入数分钟,使溶液中CO气体饱和,将水热釜密封,置于马弗炉中在160℃反应7h。
(3)待上述混合溶液冷却到室温,用丙酮和乙醇的混合溶液进行离心、洗涤,反复操作5次,将得到的产物溶解在4mL乙醇中,备用。
经表征,按照上述步骤制备得到的产物中,Rh、Pd、H三元素组成面心立方的合金结构,纳米片尺寸范围为200~325nm,厚度范围为1.5~2nm。按照实施例1的方法进行电催化析氢性能测试,结果表明,该材料也具有超高的电催化析氢活性和稳定性。
实施例3
(1)称取前驱体盐Rh(acac)3 6mg,Pd(acac)2 8mg溶解在5mL的甲醛溶剂中,同时加入聚乙烯吡咯烷酮130mg,置于室温搅拌1h,待前驱体盐完全溶解,形成均匀的浅黄色溶液。
(2)将上述溶液转入20mL的水热釜中,控制CO的流量为600mL min-1,连续通入数分钟,使溶液中CO气体饱和,将水热釜密封,置于马弗炉中在160℃反应8h。
(3)待上述混合溶液冷却到室温,用丙酮和乙醇的混合溶液进行离心、洗涤,反复操作5次,将得到的产物溶解在4mL乙醇中,备用。
经表征,按照上述步骤制备得到的产物中,Rh、Pd、H三元素组成面心立方的合金结构,纳米片尺寸范围为200~325nm,厚度范围为1.5~2nm。按照实施例1的方法进行电催化析氢性能测试,结果表明,该材料也具有超高的电催化析氢活性和稳定性。
Claims (2)
1.一种超薄的RhPdH纳米片电催化析氢材料的制备方法,其特征在于,包括以下步骤:
(1)称取前驱体盐Rh(acac)3和Pd(acac)2各6~10 mg溶解在5~10 mL的甲醛溶剂中,同时加入聚乙烯吡咯烷酮110~130 mg,置于室温搅拌均匀,待前驱体盐完全溶解,形成均匀的浅黄色溶液;
(2)将上述溶液转移至水热釜中,通入一定量的CO气体,使溶液中CO气体饱和,将水热釜密封,置于马弗炉中在160℃反应6~8 h;
(3)待步骤(2)得到的混合溶液冷却到室温,用丙酮和乙醇的混合溶液进行离心、洗涤,得到超薄的RhPdH纳米片电催化析氢材料;所述RhPdH纳米片电催化析氢材料为Rh、Pd、H三元素组成面心立方的合金结构,纳米片尺寸范围为200~325 nm,厚度范围为1.5~2 nm。
2.一种权利要求1所述制备方法制得的超薄的RhPdH纳米片电催化析氢材料在电催化析氢反应中的应用。
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