Activity and durability of Pt-Ni nanocage electocatalysts in proton exchange membrane fuel cells

被引：92

作者：

Peng, Xiong ^{[1
]}

Zhao, Shuai ^{[1
]}

Omasta, Travis J. ^{[1
]}

Roller, Justin M. ^{[2
]}

Mustain, William E. ^{[1
]}

机构：

[1] Univ Connecticut, Dept Chem & Biomol Engn, 191 Auditorium Dr, Storrs, CT 06269 USA

[2] FEI, 5350 NE Dawson Creek Dr, Hillsboro, OR 97124 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2017年 / 203卷

关键词：

PEM fuel cell; Nanocage; Oxygen reduction; High performance; Stability; OXYGEN REDUCTION REACTION; ALLOY; NANOPARTICLES; DEGRADATION; NANOFRAMES; CATALYSTS; ELECTROCATALYSIS; CONSTRUCTION; SURFACES; CATHODE;

D O I：

10.1016/j.apcatb.2016.10.081

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A Ni-rich Pt-Ni alloy was synthesized via a solvothermal method and transformed into platinum-nickel nanocage catalysts (PNCs) by applying a two-phase corrosion process. The catalysts were physically and electrochemically characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and both cyclic and linear sweep voltammetry using a rotating disk electrode (RDE). During the RDE testing, the half-wave potential of the PNC was 30 mV higher compared to that of a commercial Pt/C catalyst for the oxygen reduction reaction (ORR). The RDE experiments showed that the specific and mass activity of the PNC was 2 and 4 times greater than Pt/C, respectively, at 0.9 V. Catalyst-coated membranes (CCMs) were fabricated with the Pt-Ni nanocages using an automated air-assisted cylindrical liquid jet sprayer system. The PNC CCMs were loaded into proton exchange membrane fuel cells (PEMFC) for activity and stability testing. The CCMs showed no obvious Pt and Ni dissolution and redeposition in the membrane even after 30 K cycles. The performance and electrochemically active surface area (ECSA) retention of the PNC was far superior to commercial Pt/C, just short of the US Department of Energy (DOE) 2020 targets, suggesting that Pt-alloy nanocages are very promising candidates for high-performing commercial PEMFCs. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：927 / 935

页数：9