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Ultrathin cobalt-based bimetallic oxide nanosheet prepared through room-temperature one-pot method

A bimetallic oxide, ultra-thin cobalt technology, applied in metal/metal oxide/metal hydroxide catalysts, nanotechnology, nanotechnology, etc., can solve the problems of complex synthesis process, harsh synthesis conditions, and long synthesis time. , to achieve the effect of simple operation, low cost and low energy consumption

Inactive Publication Date: 2019-07-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above method can improve the catalytic activity of oxides, the synthesis process is relatively complicated (such as long synthesis time, cumbersome steps, etc.), and the synthesis conditions are harsh.

Method used

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  • Ultrathin cobalt-based bimetallic oxide nanosheet prepared through room-temperature one-pot method
  • Ultrathin cobalt-based bimetallic oxide nanosheet prepared through room-temperature one-pot method
  • Ultrathin cobalt-based bimetallic oxide nanosheet prepared through room-temperature one-pot method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 实例1:室温一锅法超薄铁钴双金属氧化物纳米片,包括如下步骤:

[0024] (1)以去离子水作为溶剂配置0.5mol / L的K 3 Co(CN) 6 溶液和0.5mol / L的FeCl 3 溶液,以去离子水作为溶剂配置2.0mol / L NaBH 4 solution;

[0025] (2)取0.25mL的0.5mol / L的FeCl 3 溶液和1mL的0.5mol / L的K 3 Co(CN) 6 溶液混合,静置12小时;

[0026] (3)取100mL2.0mol / L NaBH 4 溶液,逐滴加入到步骤(2)的混合液中,剧烈搅拌24小时;

[0027] (4)离心取黑色沉淀物,再分别用去离子水洗涤3次,真空60℃干燥过夜,得到的粉末固体即为超薄铁钴双金属氧化物纳米片。

[0028] 结果表明,所制备的铁钴双金属氧化物纳米片厚度在3-4nm,在1M KOH溶液中电化学水氧化性能优异,电流密度为10mA / cm 2 时过电位为260mV。

example 2

[0029] 实例2:超薄镍钴双金属氧化物纳米片,包括如下步骤:

[0030] (1)以去离子水作为溶剂配置0.5mol / L的K 3 Co(CN) 6 溶液和0.5mol / L的NiCl 2 溶液,以去离子水作为溶剂配置2.0mol / L NaBH 4 solution;

[0031] (2)取0.25mL的0.5mol / L的NiCl 2 溶液和1mL的0.5mol / L的K 3 Co(CN) 6 溶液混合,静置12小时;

[0032] (3)取100mL2.0mol / L NaBH 4 溶液,逐滴加入到步骤(2)的混合液中,剧烈搅拌24小时;

[0033] (4)离心取黑色沉淀物,再分别用去离子水洗涤3次,真空60℃干燥过夜,得到的粉末固体即为超薄镍钴双金属氧化物纳米片。

[0034] 结果表明,所制备的铁钴双金属氧化物纳米片,在1M KOH溶液中电化学水氧化性能优异,电流密度为10mA / cm 2 时过电位为270mV。

example 3

[0035] 实例3:超薄铜钴双金属氧化物纳米片,包括如下步骤:

[0036] (1)以去离子水作为溶剂配置0.5mol / L的K 3 Co(CN) 6 溶液和0.5mol / L的CuCl 2 溶液,以去离子水作为溶剂配置2.0mol / L NaBH 4 solution;

[0037] (2)取0.25mL的0.5mol / L的CuCl 2 溶液和1mL的0.5mol / L的K 3 Co(CN) 6 溶液混合,静置12小时;

[0038] (3)取100mL2.0mol / L NaBH4溶液,逐滴加入到步骤(2)的混合液中,剧烈搅拌24小时;

[0039] (4)离心取黑色沉淀物,再分别用去离子水洗涤3次,真空60℃干燥过夜,得到的粉末固体即为超薄铜钴基双金属氧化物纳米片。

[0040] 结果表明,所制备的铁钴双金属氧化物纳米片,在1M KOH溶液中电化学水氧化性能优异,电流密度为10mA / cm 2 时过电位为320mV。

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Abstract

The invention relates to an ultrathin cobalt-based bimetallic oxide nanosheet prepared through a room-temperature one-pot method, and belongs to the technical field of synthesis of catalysts. According to the method, potassium hexacyanocobaltate and metal chloride serve as raw reaction materials, a strong reducing agent is added after the raw reaction materials are mixed in a certain proportion, and the cobalt-based bimetallic oxide nanosheet is obtained through a one-step reaction under the condition of room temperature and normal pressure. The ultrathin cobalt-based bimetallic oxide nanosheet is characterized in that the cobalt-based bimetallic oxide is the ultrathin nanosheet, and has oxygen enrichment defects, and excellent electrochemistry water oxidation performance, the synthesis method is simple, and energy consumption is low.

Description

technical field [0001] 本发明属于催化剂合成技术领域,具体包括室温一锅法制备超薄钴基双金属氧化物纳米片。 Background technique [0002] 金属氧化物作为光 / 电催化剂、能源存储材料、气敏材料等被广泛使用,具有成本低、耐腐蚀、资源丰富以及环境友好等优点。电化学水氧化是电解水器件与金属-空气电池涉及的关键半反应,是决定能源器件转化效率的重要因素。金属氧化物用于电化学水氧化催化剂的研究成为热点之一。传统贵金属氧化物,如氧化钌(RuO 2 )和氧化铱(IrO 2 ),虽具有优异的电化学水氧化活性,但高成本严重限制了该类贵金属催化剂的推广和应用。因此,开发具有高活性、长寿命、低成本的催化剂,对电化学水氧化及其相关技术的发展至关重要。近年来已发展出多种氧化物催化剂,如在泡沫镍上负载铁钴金属氧化物兼具优异的电催化水产氧性能和产氢性能,同时具有较好的稳定性(参见Electrochimica Acta 249,2017,253–262);在氧化钛上负载镍钴双金属氧化物同样具有高的电化学水氧化性能(参见International Journal of Hydrogen Energy,2017,42(1),119-124.)等。 [0003] 过渡金属氧化物的催化活性主要受限于以下两方面因素:1)活性位点暴露不充分,降低了反应物与活性位点之间接触的可能性;2)导电性较差,增加了催化过程中的电子转移阻力。增加氧化物表面积,有利于反应物的扩散以及暴露出更多活性位点,从而促进界面电荷的快速转移进而提高活性(参见ACS Catalysis,2018,2(3):1913–1920.);在氧化物表面引入氧空位,可以提高其导电性(参见Advanced Materials,2017,29(17):1606793.)。上述方法虽然能够提升氧化物催化活性,但合成过程较为复杂(如合成时间长、步骤繁琐等),合成条件苛刻。所以,迫切寻求简单、高效合成高性能金属氧化物催化剂的方法。 Contents of the invention [0004] 本发明目的在于克服背景技术所涉及的技术瓶颈,在室温下一锅法制备超薄钴基双金属氧化物纳米片,并用于电化学水氧化反应。 [0005] 为解决上述问题,本发明提供的技术方案为: [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/755B01J35/00B01J35/02B01J37/16B82Y30/00B82Y40/00
CPCB01J37/16B01J23/75B01J23/755B82Y30/00B82Y40/00B01J35/33B01J35/00B01J35/30
Inventor 雷永鹏王启晨刘毅周科朝
Owner CENT SOUTH UNIV