Effects of electrodeposited Co and Co-P catalysts on the hydrogen generation properties from hydrolysis of alkaline sodium borohydride solution
Effects of electrodeposited Co and Co-P catalysts on the hydrogen generation properties from hydrolysis of alkaline sodium borohydride solution
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DOI：
10.1016/j.cattod.2006.09.004
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发表时间：
2007-02-28
期刊：
影响因子：
5.3
通讯作者：
Kwon, Hyuk Sang
中科院分区：
文献类型：
--
作者：
Cho, Keun Woo;Kwon, Hyuk Sang
在硫酸盐溶液中，以Cu为载体，分别制备了无H_2PO_2 ~-和有H_2PO_2 ~-的Co和Co-P催化剂，用于碱性NaBH_4溶液制氢。研究了电沉积过程中阴极电流密度和电镀时间对Co和Co-P催化剂微观结构和产氢性能的影响。在含H_2PO_2 ~-的硫酸盐体系中，通过电镀获得了具有微裂纹的非晶态Co-P镀层。发现在0.01 A/cm（2）下形成的非晶态Co-P催化剂对NaBH_4水解的催化活性比多晶Co催化剂高18倍。电沉积Co-P催化剂对NaBH_4水解的催化活性被发现是阴极电流密度和电镀时间的函数，即决定Co-P催化剂中P浓度的参数。尤其是Co-13原子%在阴极电流密度为0.01 A/cm ~ 2、反应时间为1080 s的条件下，在1 wt.%的催化剂中，Cu/P催化剂的最佳产氢速率为954 ml/min NaOH + 10重量% NaBH 4溶液，30 ℃。(c)2006年爱思唯尔B. V.保留所有战斗。
Co and Co-P catalysts electroplated on Cu in sulfate based solution without or with an addition of H2PO2- ions were developed for hydrogen generation from alkaline NaBH4 solution. The microstructures of the Co and Co-P catalysts and their hydrogen generation properties were analyzed as a function of cathodic current density and plating time during the electrodeposition. An amorphous Co-P electrodeposit with micro-cracks was formed by electroplating in the sulfate based solution containing H2PO2- ions. It was found that the amorphous Co-P catalyst formed at 0.01 A/cm(2) exhibited 18 times higher catalytic activity for hydrolysis of NaBH4 than did the polycrystalline Co catalyst. The catalytic activity of the electrodeposited Co-P catalyst for hydrolysis of NaBH4 was found to be a function of both cathodic current density and plating time, that is, parameters determining the concentration of P in the Co-P catalyst. Especially, Co-13 at.% P catalyst electroplated on Cu in the Co-P bath at a cathodic current density of 0.01 A/cm(2) for 1080 s showed the best hydrogen generation rate of 954 ml/min g-catalyst in 1 wt.% NaOH + 10 wt.% NaBH4 solution at 30 degrees C. (c) 2006 Elsevier B.V. All fights reserved.