摘要
硼氢化物水解是导致直接硼氢化物燃料电池(DBFC)燃料效率下降的主要问题之一。将Co_3O_4用于DBFC阳极催化剂并通过镀银处理以降低水解反应。以CoCl_2·6H_2O为原料制备Co_3O_4,并通过银镜反应对其进行镀银处理,制得Co_3O_4@Ag。通过X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱(EDS)对其进行物理表征,通过交流阻抗(EIS)、计时电流(CA)和电池测试对其电化学性能进行表征。结果表明,利用银镜反应成功地将Ag引入到催化剂体系,且Co_3O_4@Ag催化材料的含银量为2%。电化学测试表明,与Co_3O_4相比Co_3O_4@Ag具有更高的电催化活性。以Co_3O_4@Ag为阳极催化剂组装的燃料电池在室温下最大功率密度(55 m W·cm^(-2))和比容量(971 m A·h·g^(-1))较Co_3O_4分别提高了44.7%和32.1%,阳极催化剂性能得到显著提高。Ag在抑制水解反应的同时与Co_3O_4体现了协同催化的作用。
Hydrolysis of borohydride is one of the major problems leading to a decrease in the fuel efficiency of direct borohydride fuel cell （DBFC）. CO304 was first used as DBFC anode catalyst and to reduce the hydrolysis reaction by silver plating treatment. CO304 was prepared by using COC12 · 6H2O and silvered on its surface by silver mirror reaction to obtain C0304@Ag. The physics properties of the catalyst were investigated by X-ray diffraction （XRD）, scanning electron microscope （SEM） and energy-dispersive X-ray spectroscopy （EDS）. The electrochemical properties were investigated by electrochemical impedance spectroscopy （EIS）, chronoamperometry （CA） and fuel cell test. The characterizations demonstrate that Ag was successfully introduced into the catalyst system by silver mirror reaction and account for 2% of the C0304@Ag catalytic material. Electrochemical tests showed that C0304@Ag had a higher electro-catalytic activity than CO304. The maximum power density （55 mW · cm^-2） and specific capacity （971 mA · h · g^-l） of fuel cell, which was fabricated by using Co304@Ag as anode catalyst, increased by 44.7% and 32.1%, respectively than CO304 at room temperature. The performance of anode catalyst was significantly increased. Ag reflected the synergistic catalytic effect with Co304 when it inhibited the hydrolysis reaction.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2017年第5期2162-2168,共7页
CIESC Journal
基金
宁夏自然科学基金项目(NZ14097)
宁夏高等学校科学技术研究项目(NGY2016163)~~
关键词
电化学
燃料电池
阳极催化剂
镀银处理
水解
electrochemistry
fuel cells
anode catalyst
sliver plating treatment
hydrolysis
