BCC-Phased PdCu Alloy as a Highly Active Electrocatalyst for Hydrogen Oxidation in Alkaline Electrolytes

Qiu, Yang; Xin, Le; Li, Yawei; McCrum, Ian T.; Guo, Fangmin; Ma, Tao; Ren, Yang; Liu, Qi; Zhou, Lin; Gu, Shuang; Janik, Michael J.; Li, Wenzhen

doi:10.1021/jacs.8b08356

Title: BCC-Phased PdCu Alloy as a Highly Active Electrocatalyst for Hydrogen Oxidation in Alkaline Electrolytes

Journal Article · 04 November 2018 · Journal of the American Chemical Society

DOI: https://doi.org/10.1021/jacs.8b08356 · OSTI ID:1504452

Qiu, Yang ^[1]; Xin, Le ^[1];

^[2]; McCrum, Ian T. ^[2]; Guo, Fangmin ^[3]; Ma, Tao ^[4]; Ren, Yang ^[3]; Liu, Qi ^[3]; Zhou, Lin ^[4]; Gu, Shuang ^[5]; Janik, Michael J. ^[2];

^[4]

Iowa State Univ., Ames, IA (United States)
Pennsylvania State Univ., University Park, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States)
Wichita State University (United States)

We report that anion-exchange membrane fuel cells hold promise to greatly reduce cost by employing nonprecious metal cathode catalysts. More efficient anode catalysts are needed, however, to improve the sluggish hydrogen oxidation reaction in alkaline electrolytes. We report that BCC-phased PdCu alloy nanoparticles, synthesized via a wet-chemistry method with a critical thermal treatment, exhibit up to 20-fold HOR improvement in both mass and specific activities, compared with the FCC-phased PdCu counterparts. HOR activity of the BCC-phased PdCu is 4 times or 2 times that of Pd/C or Pt/C, respectively, in the same alkaline electrolyte. In situ HE-XRD measurements reveal that the transformation of PdCu crystalline structure favors, at low annealing temperature (<300 °C), the formation of FCC structure. At higher annealing temperatures (300–500 °C), a BCC structure dominates the PdCu NPs. Density functional theory (DFT) computations unravel a similar H binding strength and a much stronger OH binding of the PdCu BCC surface (cf. FCC surface), both of which are simultaneously close to those of Pt surfaces. The synergistic optimization of both H and OH binding strengths is responsible for the enhancement of HOR activity on BCC-phased PdCu, which could serve as an efficient anode catalyst for anion-exchange membrane fuel cells. Lastly, this work might open a new route to develop efficient HOR catalysts from the perspective of crystalline structure transformation.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1504452

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 48 Vol. 140; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Modulating the surface segregation of PdCuRu nanocrystals for enhanced all-pH hydrogen evolution electrocatalysis Li, Menggang; Luo, Mingchuan; Xia, Zhonghong Journal of Materials Chemistry A, Vol. 7, Issue 35 https://doi.org/10.1039/c9ta06861a	journal	January 2019

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