PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation
PdNi/N-doped graphene aerogel with over wide potential activity for formic acid electrooxidation
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DOI：
10.1016/j.jechem.2020.12.007
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发表时间：
2021-08-01
影响因子：
13.1
通讯作者：
Feng, Ligang
中科院分区：
文献类型：
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作者：
Bao, Yufei;Zha, Meng;Feng, Ligang
在燃料电池技术中，抗CO中毒能力对于甲酸氧化具有重要意义。在此，研究发现负载于N掺杂石墨烯气凝胶上的PdNi合金（PdNi/GA-N）由于抗CO中毒能力的提高，在较宽的电位范围内对甲酸的电氧化具有催化能力。该催化剂通过简单的冷冻干燥石墨烯气凝胶、聚乙烯吡咯烷酮、Pd 2+和Ni 2+的混合溶液，随后在N2/H2气氛中热退火还原的方法制备。Pd-Ni合金颗粒锚定在折叠的N掺杂石墨烯表面上，在3D方向上具有多孔分级架构结构。在较宽的电位范围（0.2 - 0.6 V）内，其对甲酸氧化的最大质量活性为836 mA mg（-1）。CO反萃实验表明其抗CO中毒能力大大提高，峰电位为0.67 V，与Pd/GA-N和Pd/C样品相比分别降低了约60和40 mV。3D GA-N载体与Pd-Ni合金之间的相互作用所产生的高抗CO中毒能力和强的电子效应使其成为一种有前途的直接甲酸燃料电池催化剂。(C)2020科学出版社、中国科学院大连化学物理研究所。由ELSEVIER B.V.和科学出版社出版。All rights reserved.
Anti-CO poisoning ability is significant in formic acid oxidation in the fuel cell technique. Herein, PdNi alloy supported on N-doped graphene aerogel (PdNi/GA-N) was found to have catalytic ability toward formic acid electrooxidation over a wide potential range because of the improved anti-CO poisoning ability. This catalyst was fabricated by simple freeze-drying of mixture solution of graphene aerogel, polyvinylpyrrolidone, Pd2+ and Ni2+ and the subsequent thermal annealing reduction approach in the N-2/H-2 atmosphere. Pd-Ni alloy particles anchored over the folding N-doped graphene surface with a porous hierarchical architecture structure in the 3D directions. It showed the catalytic performance of its maximum mass activity of 836 mA mg(-1) in a broad potential range (0.2-0.6 V) for formic acid oxidation. The CO stripping experiment demonstrated its largely improved anti-CO poisoning ability with the peak potential of 0.67 V, approximately 60 and 40 mV less compared to those of Pd/GA-N and Pd/C samples. The high anti-CO poisoning ability and strong electronic effect resulting from the interaction between the 3D GA-N support and the Pd-Ni alloy makes it a promising catalyst for application in direct formic acid fuel cells. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.