Journal ArticleDOI
Ultrathin Nanotube Structure for Mass-Efficient and Durable Oxygen Reduction Reaction Catalysts in PEM Fuel Cells.
Jieyuan Liu,Shiyuan Liu,Fangzheng Yan,Zishu Wen,Weiwei Chen,Xiaofang Liu,Qingtao Liu,Jia-Xiang Shang,Ronghai Yu,Dong-dong Su,Jianglan Shui +10 more
Reads0
Chats0
TLDR
In this article , an ultrathin holey nanotube (UHT)-structured Pt-M (M = Ni, Co) alloy catalysts that achieve unprecedented comprehensive performance were presented.Abstract:
It remains a challenge for platinum-based oxygen reduction reaction catalysts to simultaneously possess high mass activity and high durability in proton-exchange-membrane fuel cells. Herein, we report ultrathin holey nanotube (UHT)-structured Pt-M (M = Ni, Co) alloy catalysts that achieve unprecedented comprehensive performance. The nanotubes have ultrathin walls of 2-3 nm and construct self-supporting network-like catalyst layers with thicknesses of less than 1 μm, which have efficient mass transfer and 100% surface exposure, thus enabling high utilization of Pt atoms. Combined with the high intrinsic activity produced by the alloying effect, the catalysts achieve high mass activity. Moreover, the nanotube structure not only avoids the agglomeration problem of nanoparticles, but the low curvature of the tube wall also gives UHT a low surface energy (less than 1/3 of that of the same size nanoparticle), so UHT is more resistant to the Ostwald ripening and is stable. For the first time, the U.S. DOE mass activity target and dual durability targets for load and start-stop cycles are achieved on one catalyst. This study provides an effective structural strategy for the preparation of electrocatalysts with high atomic efficiency and excellent durability.read more
Citations
More filters
Journal ArticleDOI
Heteroatom Doped Amorphous/Crystalline Ruthenium Oxide Nanocages as a Remarkable Bifunctional Electrocatalyst for Overall Water Splitting.
TL;DR: In this article , a heteroatom-doped amorphous/crystalline ruthenium oxide-based hollow nanocages (M-ZnRuOx (M�Co, Ni, Fe)) through delicate control of composition and structure is reported.
Journal ArticleDOI
Design and Synthesis of Noble Metal-Based Alloy Electrocatalysts and Their Application in Hydrogen Evolution Reaction.
TL;DR: In this paper , a review of the application of noble metal-based alloy electrocatalysts in the field of hydrogen production from water electrolysis is summarized, and an example analysis of practical application studies on alloy ECs in hydrogen production is presented.
Journal ArticleDOI
Pt loading-dependent transport kinetics and effectiveness of Pt in proton exchange membrane fuel cells
TL;DR: In this paper , the effects of Pt loading on the transport kinetics and catalyst effectiveness in PEMFCs were investigated via detailed experimental characterizations, model analysis and numerical simulations, and the results showed that the Rlocal values corresponding to per mass of Pt actually decrease at low-Pt electrodes due to enhanced contribution of CCL|PEM interface to electrochemical surface area, which, together with reduced transport paths of gas, proton, and water in thickness direction, result in much enhanced Pt effectiveness.
Journal ArticleDOI
Progress and Perspective for In Situ Studies of Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cells
TL;DR: In this paper , the in situ studies of the ORR mechanism as well as the failure mechanisms of ORR catalysts in terms of Pt nanoparticle degradation, Pt oxidation, and poisoning by air contaminants are elaborated.
Journal ArticleDOI
Engineering carbon semi-tubes supported platinum catalyst for efficient oxygen reduction electrocatalysis
TL;DR: In this paper , the contribution of interfacial Pt-N bond between N-CST support and Pt nanoparticles with electrons transfer from N-cST support to P nanoparticles is found by electron paramagnetic resonance and X-ray absorption fine structure (XAFS) spectroscopy.
References
More filters
Journal ArticleDOI
Lattice-strain control of the activity in dealloyed core–shell fuel cell catalysts
Peter Strasser,Peter Strasser,Shirlaine Koh,Toyli Anniyev,Jeffrey Greeley,Karren L. More,Chengfei Yu,Zengcai Liu,Sarp Kaya,Dennis Nordlund,Hirohito Ogasawara,Michael F. Toney,Anders Nilsson +12 more
TL;DR: It is shown how lattice strain can be used experimentally to tune the catalytic activity of dealloyed bimetallic nanoparticles for the oxygen-reduction reaction, a key barrier to the application of fuel cells and metal-air batteries.
Journal ArticleDOI
High-performance transition metal–doped Pt3Ni octahedra for oxygen reduction reaction
Xiaoqing Huang,Zipeng Zhao,Liang Cao,Yu Chen,Enbo Zhu,Zhaoyang Lin,Mufan Li,Aiming Yan,Aiming Yan,Alex Zettl,Alex Zettl,Y. Morris Wang,Xiangfeng Duan,Tim Mueller,Yu Huang +14 more
TL;DR: In this article, surface-doped Pt3Ni octahedra supported on carbon with transition metals, termed M•Pt3Ni/C, where M is vanadium, chromium, manganese, iron, cobalt, molybdenum (Mo), tungsten, or rhenium.
Journal ArticleDOI
Instability of Pt ∕ C Electrocatalysts in Proton Exchange Membrane Fuel Cells A Mechanistic Investigation
Paulo J. Ferreira,Yang Shao-Horn,Dane Morgan,Rohit Makharia,Shyam S. Kocha,Hubert A. Gasteiger +5 more
TL;DR: In this article, a short-stack of proton exchange membrane fuel cells PEMFCs operated at open-circuit voltage 0.95 V was shown to have higher surface area loss than another operated under load 0.75 V.
Journal ArticleDOI
Fe–N–C electrocatalyst with dense active sites and efficient mass transport for high-performance proton exchange membrane fuel cells
Xin Wan,Xiaofang Liu,Yongcheng Li,Ronghai Yu,Lirong Zheng,Wensheng Yan,Hui Wang,Ming Xu,Jianglan Shui +8 more
TL;DR: Shui et al. as mentioned in this paper reported a class of concave Fe-N-C single-atom catalysts possessing an enhanced external surface area and mesoporosity that meets the 2018 PGM-free catalyst activity target.
Journal ArticleDOI
Tuning the activity of Pt alloy electrocatalysts by means of the lanthanide contraction
María Escudero-Escribano,María Escudero-Escribano,Paolo Malacrida,Martin Hangaard Hansen,Martin Hangaard Hansen,Ulrik Grønbjerg Vej-Hansen,Amado Velázquez-Palenzuela,Vladimir Tripkovic,Jakob Schiøtz,Jan Rossmeisl,Jan Rossmeisl,Ifan E. L. Stephens,Ifan E. L. Stephens,Ib Chorkendorff +13 more
TL;DR: It is demonstrated how the lanthanide contraction can be used to control strain effects and tune the activity, stability, and reactivity of these materials.