Characterization of hydrogen generation for fuel cells via borane hydrolysis using an electroless-deposited Co–P/Ni foam catalyst
Characterization of hydrogen generation for fuel cells via borane hydrolysis using an electroless-deposited Co–P/Ni foam catalyst
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DOI：
10.1016/j.jpowsour.2009.11.084
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发表时间：
2010-05
影响因子：
9.2
通讯作者：
KwangSup Eom;MinJoong Kim;Ryounghee Kim;Do-Hwan Nam;H. Kwon
中科院分区：
文献类型：
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作者：
KwangSup Eom;MinJoong Kim;Ryounghee Kim;Do-Hwan Nam;H. Kwon
研究了化学镀Co-P/Ni泡沫催化剂对氨硼烷（NH_3BH_3）溶液中H_2生成动力学的影响以及催化剂的循环性能（耐久性）。化学沉积的Co-P由内部平坦层和由球形颗粒聚集体组成的外层组成。Co-P/Ni泡沫催化剂的H2生成速率/投影面积比Co-P/Cu片状催化剂的H2生成速率/投影面积高得多。使用Co-P/Ni泡沫催化剂水解NH3 BH 3的活化能（Ea）计算为48 kJmol −1。在第一次循环之后，H2产生速率显著降低，即，16%，由于球形Co-P颗粒的部分分离引起的表面积减小。在第一次和第六次循环之间，由于在催化表面上产生活性金属Co位点的P原子的数量减少，H2产生速率逐渐降低（14%）。在六个循环之后，约70%的初始H2生成速率保持恒定。该研究为聚合物电解质膜燃料电池提供了一种很有前途的制氢方法。
The effect of an electroless-deposited Co–P/Ni foam catalyst on H2generation kinetics in ammonia borane (NH3BH3) solution and the cyclic behaviour (durability) of the catalyst are investigated. The electroless-deposited Co–P is composed of an inner flat layer and outer layer that consists of an aggregate of spherical particles. The H2generation rate/projected area of the Co–P/Ni foam catalyst is much higher than that of a Co–P/Cu sheet catalyst. The activation energy (Ea) for the hydrolysis of NH3BH3using the Co–P/Ni foam catalyst is calculated to be 48kJmol−1. After the first cycle, the H2generation rate decreases dramatically, i.e., by 16%, due to a decrease in surface area caused by the partial separation of spherical Co–P particles. Between the first and sixth cycles, the H2generation rate decreases gradually (by 14%) on account of a decrease in the number of P atoms that create active metallic Co sites on catalytic surface. After six cycles, about 70% of the initial H2generation rate remains constant. The study reveals a promising means of hydrogen generation for polymer electrolyte membrane fuel cells.