Pt nanoparticles coated on multiwalled carbon nanotubes by the modification of small-sized molybdenum phosphide for enha
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ORIGINAL PAPER
Pt nanoparticles coated on multiwalled carbon nanotubes by the modification of small-sized molybdenum phosphide for enhanced methanol electro-oxidation Chenglong Zhou 1 & Mengyu Gan 1 & Fei Xie 1 & Li Ma 1 & Junjie Ding 1 & Jun Shen 1 & Sichen Han 1 & Deying Wei 1 & Wang Zhan 1 Received: 24 April 2020 / Revised: 6 July 2020 / Accepted: 18 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In the current paper, molybdenum phosphide/multiwalled CNTs (MoP/MWCNTs) are initially synthesized as catalyst supports by a facile and general method for direct methanol fuel cells, in which MoP nanocrystals with small-sized and well-crystallized deposited the sidewalls of multiwalled CNT. Then, Pt nanoparticles supported on MoP/MWCNTs composites by the NaBH4 reduction method. Electrochemical tests indicate that the as-prepared novel Pt-MoP/MWCNTs-3 catalyst exhibits the good catalytic activity of 1063 mA mg–1 Pt during methanol electro-oxidation reaction, which is 3.5 times than that of Pt-MWCNTs (278 mA mg–1 Pt). Moreover, Pt-MoP/MWCNTs-3 catalyst also shows the better electrocatalytic durability and CO poisoning resistance; these results vastly benefit from the interaction between Pt and MoP, and the homogeneous dispersion of Pt nanoparticles. This work demonstrates the better co-catalytic activity of MoP during methanol oxidation reaction, and which provides new insights into the further application of MoP to other electrochemical areas. Keywords Small-sized MoP . Pt-based catalyst . Co-catalytic effect . Methanol oxidation reaction
Introduction With the rising energy demand and serious environmental pollution, an increasing number of researchers devote to developing a promising power source [1–3]. Particularly, direct methanol fuel cells (DMFCs) are considered as an environmentally friendly power sources for stationary and mobile applications, having received more research interest during several types of direct liquid fuel cells [4–6]. For instance, a thrilled advancement was reported that a milestone for the commercialization of DMFC systems with 7 kW successfully running 20,000 h was achieved [7]. However, the scarcity and poor stability of Pt and electrocatalytic stability greatly hamper its large-scale application [8–10].
* Fei Xie [email protected] * Li Ma [email protected] 1
College of Chemistry & Chemical Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
To overcome the above-mentioned problems, gigantic works have been committed to increasing the CO tolerance of Pt nanoparticles (NPs) and reducing platinum usage by the immission of an earth-abundant and inexpensive co-catalyst, for instance metallic oxide (MnO2 [11], WO3 [12], CeO2 [13–15], and SnO2 [16]), the introduction of heteroatom (S, N, P) [17–20], and polymer [21, 22] et al. The incorporation of metal components and metal oxide can significantly improve the methanol oxidation activity of Pt; however, the utility and tolerance to CO poisoning of Pt-based catalysts are still weak. He
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