3 research outputs found
MOESM1 of Process optimization for enhancing production of cis-4-hydroxy-l-proline by engineered Escherichia coli
Additional file 1. Additional tables and figures
Synergistic Utilization of a CeO<sub>2</sub>‑Anchored Bifunctionalized Metal–Organic Framework in a Polymer Nanocomposite toward Achieving High Power Density and Durability of PEMFC
The free radicals produced during
the long-term operation of fuel
cells can accelerate the chemical degradation of the proton exchange
membrane (PEM). In the present work, the widely used free radical
scavenger CeO2 was anchored on amino-functionalized metal–organic
frameworks, and flexible alkyl sulfonic acid side chains were tethered
onto the surface of inorganic nanoparticles. The prepared CeO2-anchored bifunctionalized metal–organic framework
(CeO2-MNCS) was used as a promising synergistic filler
to modify the Nafion matrix for addressing the detrimental effect
of pristine CeO2 on the performance and durability of PEMs,
including decreased proton conductivity and the migration problem
of CeO2. The obtained hybrid membranes exhibited a high
proton conductivity up to 0.239 S cm–1, enabling
them to achieve a high power density of 591.47 mW cm–2 in a H2/air PEMFC single cell, almost 1.59 times higher
than that of recast Nafion. After 115 h of acceleration testing, the
OCV decay ratio of the hybrid membrane was decreased to 0.54 mV h–1, which was significantly lower than that of recast
Nafion (2.18 mV h–1). The hybrid membrane still
maintained high power density, low hydrogen crossover, and unabated
catalytic activity of the catalyst layer after the durability test.
This study provides an effective one-stone-two-birds strategy to develop
highly durable PEMs by immobilizing CeO2 without sacrificing
proton conductivity, allowing for the realization of improvement on
the performance and sustained durability of PEMFC simultaneously
MOESM1 of Process optimization for enhancing production of cis-4-hydroxy-l-proline by engineered Escherichia coli
Additional file 1. Additional tables and figures