Article
Chemistry, Applied
Kirill A. Kurdin, Vitaly V. Kuznetsov, Vitaly V. Sinitsyn, Elena A. Galitskaya, Elena A. Filatova, Charles A. Belina, Keith J. Stevenson
Summary: Two simple synthetic procedures were developed for the synthesis of Pt-HxMoO3 composites, and the composition and structure of the catalysts were characterized using various physical methods. The prepared composites exhibited promising CO-tolerance, providing a potential method for the synthesis of CO-tolerant catalysts in practical fuel cells.
Article
Chemistry, Physical
Ye Peng, Ja-Yeon Choi, Liliang Tian, Kyoung Bai, Yi Zhang, Dongchu Chen, Jianhuang Zeng, Dustin Banham
Summary: The distribution of platinum group metal (PGM) nanoparticle catalysts in the carbon support significantly affects the catalyst's performance. The placement of Pt either on the outer surface or within the pores of the carbon results in different activity and performance at high current densities. To gain further insight into the catalyst's properties, a relationship between Pt distribution and relative humidity (RH) tolerance is explored. This work provides valuable information for MEA designers in selecting catalysts for specific applications.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Multidisciplinary
Jin Huang, Bosi Peng, Thomas Stracensky, Zeyan Liu, Ao Zhang, Mingjie Xu, Yang Liu, Zipeng Zhao, Xiangfeng Duan, Qingying Jia, Yu Huang
Summary: Ultra-thin platinum-cobalt nanowires (PtCoNWs) have been developed as cathode catalysts for proton-exchange membrane fuel cells, enabling ultra-low platinum loading and high-performance membrane electrode assembly. The PtCoNWs exhibit outstanding activity and stability in the oxygen reduction reaction, potentially due to the highly alloyed structure.
SCIENCE CHINA-MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Shaojie Ke, Bolan Cui, Chaoyong Sun, Yufeng Qin, Jiakun Zhang, Meiling Dou
Summary: The quality of hydrogen is crucial for the long lifetime of proton-exchange membrane fuel cell (PEMFC) vehicles, but the presence of trace H2S impurities in hydrogen has a significant impact on their durability and fuel expense. In this study, a robust PtRu alloy catalyst with impressive H2S tolerance was demonstrated as the anode for PEMFC, exhibiting superior anti-poisoning capability compared to the Pt/C anode. The use of PtRu/C as the anode allows for a higher H2S limit in hydrogen, thereby reducing the cost of hydrogen purification.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Thermodynamics
Hong Wang, Rui Lin, Xin Cai, Shengchu Liu, Di Zhong, Zhixian Hao
Summary: Reducing Pt loading in the CCL is cost-effective but leads to voltage drops, while Pt-alloy electrocatalysts offer high catalytic activities but face challenges from transition metal dissolution. A unique CCL design can effectively mitigate Ni dissolution and its impact on MEA.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Yabiao Pei, Weikang Zhu, Runfei Yue, Lianqin Wang, Ran Li, Junfeng Zhang, Yan Yin
Summary: This study focuses on the application of carbon nanotube-supported platinum catalysts in proton exchange membrane fuel cells (PEMFCs). By constructing membrane electrode assemblies (MEAs) with ultra-low Pt loading, the researchers achieved superior performance and durability. The carbon nanotube-supported cathode catalyst layer demonstrated enhanced mass transfer, graphitization of CNTs, and Pt utilization, leading to high fuel cell performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Shuai Shi, Xianglong Wen, Qinqin Sang, Shuai Yin, Kaili Wang, Jian Zhang, Min Hu, Huiming Yin, Jia He, Yi Ding
Summary: Designing catalyst layers with high proton conductivity in membrane electrode assemblies is crucial for proton exchange membrane fuel cells. The use of an ultrathin Pt-decorated nanoporous gold catalyst layer has been shown to significantly improve proton conduction and achieve excellent power density in carbon-free electrodes.
Article
Engineering, Chemical
Wei Hong, Xinran Shen, Jian Wang, Xin Feng, Wenjing Zhang, Jing Li, Zidong Wei
Summary: To improve the performance of membrane electrode assembly (MEA) at large current density, reducing the catalyst layer thickness is an effective strategy. This study demonstrates that constructing high loading Pt-alloy catalysts on carbon can achieve this goal, although high loading might lead to particle aggregation. The H-PtNi/C catalyst with 33% Pt loading exhibits higher peak power density and mass transfer limiting current density in H-2-O-2 MEA, attributed to the thinner catalyst layer and enhanced mass transfer.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Electrochemistry
Nagappan Ramaswamy, Swami Kumaraguru, Wenbin Gu, Ratandeep Singh Kukreja, Kang Yu, Daniel Groom, Paulo Ferreira
Summary: The durability of carbon supported PtCo-alloy based nanoparticle catalysts is crucial for the longevity of proton-exchange membrane fuel cells in electric vehicle applications. Factors causing performance degradation of PtCo-based cathode catalyst layers over time include ECSA loss, specific activity loss, H+/O-2-transport changes, and Co2+ contamination effects. Accelerated stress test voltage cycling protocol compares the durability of Pt and PtCo catalysts, revealing that PtCo catalysts exhibit larger cell voltage loss at high current densities due to secondary effects of leached Co2+ cations contaminating the electrode ionomer. A 1D performance model quantifies cell voltage losses from various degradation factors of the membrane electrode assembly.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Thermodynamics
Xiaojing Cheng, Guanghua Wei, Chao Wang, Shuiyun Shen, Junliang Zhang
Summary: Carbon support has significant impacts on the oxygen transport resistance in cathode catalyst layers, with surface properties and geometrical morphology being key factors.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Chemistry, Physical
Chengming Huang, Wenjing Zhang, Jing Li, Zidong Wei
Summary: Polymer electrolyte membrane fuel cells (PEMFCs) are promising energy conversion devices with advantages of cleanliness, efficiency, low-temperature operation, abundant fuel sources, and portability. The use of noble metal Pt catalysts in the oxygen reduction reaction (ORR) needs to be reduced for large-scale commercial application of PEMFCs. Alloying with transition metals to develop ORR catalysts with high activity and stability by reducing Pt usage and increasing Pt utilization is the main research focus in recent years.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Dongjiang Jiang, Ying Shi, Guofeng Zhao, Xiaodi Gong, Jichang Liu, Dengpeng Lan, Lidong Zhang, Jianping Ge, Huimin Fang, Denghui Cheng, Haitao Xu
Summary: This study demonstrates a feasible strategy for converting CO2 into CO using nanocable catalysts Pt-Ni@UiO-67, and the catalytic performance can be improved by adjusting the thickness of the UiO-67 membrane. The results show that an appropriate thickness of the UiO-67 membrane can enhance CO2 conversion.
MATERIALS TODAY ENERGY
(2022)
Article
Chemistry, Physical
Chenzhao Li, Limin Zhu, Liang Song, Guangqi Zhu, Qi Zhang, Yuyue Zhao, Qing Gong, Chengjun Sun, Yuzi Liu, Kotaro Sasaki, Jian Xie
Summary: This study focuses on the stability of Pt nanoparticles on a carbon support, which is crucial for the lifespan of fuel cells and electrocatalysis systems. The covalently grafted polyaniline on carbon is shown to stabilize Pt nanoparticles by alleviating particle migration and mitigating Ostwald ripening, resulting in increased redox potential and resistance to oxidation of the Pt nanoparticles.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Electrochemistry
Ershuai Liu, Qingying Jia, James Waldecker, Kai Sun, Li Jiao, Thomas Stracensky, Sanjeev Mukerjee
Summary: In this study, the interaction between Pt and O in the Pt/NbOx/C catalyst was found to play a crucial role in its oxygen reduction reaction activity, while the formation of metallic Nb phase during long-term PEMFC operation led to severe particle growth of Pt.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Review
Chemistry, Multidisciplinary
Xuewei Zhang, Haiou Li, Jian Yang, Yijie Lei, Cheng Wang, Jianlong Wang, Yaping Tang, Zongqiang Mao
Summary: This article examines the advancements in Pt-based ORR electrocatalysts to enhance activity and durability, as well as compares the performance of developed electrocatalysts in MEA.
