Journal
JOURNAL OF POWER SOURCES
Volume 435, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.226798
Keywords
Platinum-rhodium; Lamellar nanoalloy aerogel; Hydrogen oxidation reaction; Hydrogen evolution reaction; Anion exchange membrane fuel cell
Funding
- National Natural Science Foundation of China [51874243, 51271148, 50971100]
- Research Fund of State Key Laboratory of Solidification Processing in China [150-ZH-2016]
- Aeronautic Science Foundation Program of China [2012ZF53073]
- Project of Transformation of Scientific and Technological Achievements of NWPU [19-2017]
- Open Fund of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) [2018-KF-18]
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Hydrogen oxidation and evolution reactions (HOR and HER) in alkaline media are very kinetically sluggish, which becomes one of major barriers for the breakthrough of anion exchange membrane fuel cells. Thus, developing highly active and economically competitive HOR/HER electrocatalysts for alkaline electrolytes is of critical importance to realize future hydrogen economy. Herein, we for the first time report a new class of platinum-rhodium nanoalloy aerogel (PtRh NAA) via a facile and controllable strategy as exceptional HOR/HER electrocatalysts in alkaline environment. The as-synthesized PtRh NAA features unique lamellar architecture, hierarchical pores system and abundant low-coordinated sites. Benefiting from the combined structural and electronic effects as well as bifunctional synergetic effects, the lamellar PtRh NAA delivers an excellent HOR specific activity of 1.25 mA cm(pt+Rh)(-2), which is 5.5 times higher than that of the commercial Pt/C (0.225 mA cm(pt)(-2)). Meanwhile, its HER overpotential at -10 mA cm(-2) can be lowered to -55 mV, representing one of the highest HER activity so far. Moreover, no obvious deactivations are observed even after 5000 potential cycles for both HOR and HER, exhibiting excellent operation stability. These findings open a new field to design more advanced aerogels with high electrocatalytic performance.
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