Citation: Li Menggang, Xia Zhonghong, Huang Yarong, Tao Lu, Chao Yuguang, Yin Kun, Yang Wenxiu, Yang Weiwei, Yu Yongsheng, Guo Shaojun. Rh-Doped PdCu Ordered Intermetallics for Enhanced Oxygen Reduction Electrocatalysis with Superior Methanol Tolerance[J]. Acta Physico-Chimica Sinica, ;2020, 36(9): 191204. doi: 10.3866/PKU.WHXB201912049 shu

Rh-Doped PdCu Ordered Intermetallics for Enhanced Oxygen Reduction Electrocatalysis with Superior Methanol Tolerance

Li Menggang ^1,2 ,
Xia Zhonghong ² ,
Huang Yarong ¹ ,
Tao Lu ² ,
Chao Yuguang ² ,
Yin Kun ² ,
Yang Wenxiu ² ,
Yang Weiwei ^1,, ,
Yu Yongsheng ^1,, ,
Guo Shaojun ^2,3,,

1.
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China
2.
Department of Materials Science & Engineering, College of Engineering, Peking University, Beijing 100871, P. R. China
3.
BIC-ESAT, College of Engineering, Peking University, Beijing 100871, P. R. China

Corresponding author: Yang Weiwei, yangww@hit.edu.cn Yu Yongsheng, ysyu@hit.edu.cn Guo Shaojun, guosj@pku.edu.cn
Received Date: 19 December 2019
Revised Date: 23 February 2020
Accepted Date: 26 February 2020
Available Online: 6 March 2020
Fund Project: the China Postdoctoral Science Foundation 2018M631239the National Natural Science Foundation of China 51871078the National Key R & D Program of China 2016YFB0100201The project was supported by the Beijing Natural Science Foundation, China (JQ18005), the National Key R & D Program of China (2016YFB0100201), the National Natural Science Foundation of China (51671003, 21802003, 51571072, 51871078), and the China Postdoctoral Science Foundation (2018M631239)the National Natural Science Foundation of China 51671003the National Natural Science Foundation of China 51571072the National Natural Science Foundation of China 21802003the Beijing Natural Science Foundation, China JQ18005

Direct methanol fuel cells (DMFCs), as one of the important energy conversion devices, are of great interest in the fields of energy, catalysis and materials. However, the application of DMFCs is presently challenged because of the limited activity and durability of cathode catalysts as well as the poisoning issues caused by methanol permeation to the cathode during operation. Herein, we report a new class of Rh-doped PdCu nanoparticles (NPs) with ordered intermetallic structure for enhancing the activity and durability of the cathode for oxygen reduction reaction (ORR) and achieving superior methanol tolerance. The disordered Rh-doped PdCu NPs can be prepared via a simple wet-chemical method, followed by annealing to convert it to ordered phases. The results of transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), power X-ray diffraction (PXRD) analysis and high resolution TEM (HRTEM) successfully demonstrate the formation of near-spherical NPs with an average size of 6.5 ± 0.5 nm and the conversion of the phase structure. The complete phase transition temperatures of Rh-doped PdCu NPs and PdCu are 500 and 400 ℃, respectively. The molar ratio of Rh/Pd/Cu in the as-synthesized Rh-doped PdCu NPs is 5/48/47. Benefitting from Rh doping and the presence of the ordered intermetallic structure, the Rh-doped PdCu intermetallic electrocatalyst achieves the maximum ORR mass activity of 0.96 A·mg^-1 at 0.9 V versus reversible hydrogen electrode (RHE) under alkaline conditions—a 7.4-fold enhancement compared to the commercial Pt/C catalyst. For different electrocatalysts, the ORR activities follow the sequence, ordered Rh-doped PdCu intermetallics > ordered PdCu intermetallics > disordered Rh-doped PdCu NPs > disordered PdCu NPs > commercial Pt/C catalyst. In addition, the distinct structure endows the Rh-doped PdCu intermetallics with highly stable ORR durability with unaltered half-wave potential (E_1/2) and mass activity after continuous 20000 cycles, which are higher than those of other electrocatalysts. Furthermore, the E_1/2 of the Rh-doped PdCu intermetallics decreases by only 5 mV after adding 0.5 mol·L^-1 methanol to the electrolyte, while the commercial Pt/C catalyst negatively shifts by 235 mV and a distinct oxidation peak can be observed. The results indicate that the ORR activity of the Rh-doped PdCu intermetallic electrocatalyst can be well maintained even in the presence of poisoning environment. Our results have demonstrated that Rh-doped PdCu NPs with ordered intermetallic structures is a potential electrocatalyst toward the next-generation high-performance DMFCs.
- Rh doping,
- Ordered intermetallics,
- Nanoparticle,
- Oxygen reduction,
- Methanol tolerance
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