High-performance Platinum-free oxygen reduction reaction and hydrogen oxidation reaction catalyst in polymer electrolyte membrane fuel cell.
High-performance Platinum-free oxygen reduction reaction and hydrogen oxidation reaction catalyst in polymer electrolyte membrane fuel cell.
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DOI：
10.1038/s41598-018-22001-9
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发表时间：
2018-02-26
影响因子：
4.6
通讯作者：
Ramaprabhu S
中科院分区：
文献类型：
--
作者：
Chandran P;Ghosh A;Ramaprabhu S
将聚合物电解质膜燃料电池（PEMFC）电堆集成到车辆中需要替换昂贵的铂（Pt）基电催化剂，其贡献了约45%的电堆成本。实现高性能和耐用的Pt无金属催化剂用于氧还原反应（ORR）和氢氧化反应（HOR）可以显着实现燃料电池动力车辆的大规模商业化。为了实现这一目标，采用一种简单、可扩展、一步合成的方法制备了氮掺杂还原氧化石墨烯负载钯钴合金（Pd 3Co/NG）纳米复合材料。旋转环-盘电极（RRDE）对ORR的电化学活性研究表明，ORR通过近四电子机制进行。Pd_3Co/NG催化剂的质量活性比Pd/NG催化剂提高了1.6倍。在阳极使用Pd 3Co/NG、阴极与Pt/C结合以及同时在阳极和阴极处使用Pd 3Co/NG进行全燃料电池测量。68 mW/cm 2的最大功率密度是通过同时使用Pd 3Co/NG作为阳极和阴极电催化剂来实现的，其中在60 °C下单独负载量为0.5 mg/cm 2而没有任何背压。据我们所知，本研究是第一个完全非铂基PEM全电池。
The integration of polymer electrolyte membrane fuel cell (PEMFC) stack into vehicles necessitates the replacement of high-priced platinum (Pt)-based electrocatalyst, which contributes to about 45% of the cost of the stack. The implementation of high-performance and durable Pt metal-free catalyst for both oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR) could significantly enable large-scale commercialization of fuel cell–powered vehicles. Towards this goal, a simple, scalable, single-step synthesis method was adopted to develop palladium-cobalt alloy supported on nitrogen-doped reduced graphene oxide (Pd3Co/NG) nanocomposite. Rotating ring-disk electrode (RRDE) studies for the electrochemical activity towards ORR indicates that ORR proceeds via nearly four-electron mechanism. Besides, the mass activity of Pd3Co/NG shows an enhancement of 1.6 times compared to that of Pd/NG. The full fuel cell measurements were carried out using Pd3Co/NG at the anode, cathode in conjunction with Pt/C and simultaneously at both anode and cathode. A maximum power density of 68 mW/cm2 is accomplished from the simultaneous use of Pd3Co/NG as both anode and cathode electrocatalyst with individual loading of 0.5 mg/cm2 at 60 °C without any backpressure. To the best of our knowledge, the present study is the first of its kind of a fully non-Pt based PEM full cell.
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