Scholarlink

<p>Mesoporous nanocarbons have gained significant attention as multifunctional materials for electrocatalysis and energy storage. This work reports a sol-gel strategy using trace fumed silica (3 wt%) to construct nanocarbon with predominant mesoporosity (96% mesopore surface area). The obtained material features uniform 6 ~ 8&#xa0;nm mesopores and well-defined nanostructures. Systematic characterization indicates that the fumed silica simultaneously blocks existing micropores and suppresses new micropore formation during carbonization, reducing microporosity to 3% surface area. When supporting low Pt loading (5 wt%), this mesoporous carbon demonstrates superior oxygen reduction reaction (ORR) durability, showing a 30 mV half-wave potential shift after 30,000 cycles under accelerated durability testing. This performance surpasses commercial Pt/C (64 mV shift after 3,000 cycles) by an order of magnitude in cycle stability. Enhanced durability correlates with the fumed silica radical scavenging capability. This pore-engineering approach offers a practical route to design stable catalyst support through controlled mesopore construction.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mesoporous-dominant carbon support templated by trace fumed silica for durable oxygen reduction catalyst

  • 期刊论文

  • 发表日期：

    2025年7月17日

查看全文
  • Yunpeng Xiao,
  • Shibao Dong,
  • Shuaishuai Zhang,
  • JianQiang Hu,
  • Yi Luo

摘要

Mesoporous nanocarbons have gained significant attention as multifunctional materials for electrocatalysis and energy storage. This work reports a sol-gel strategy using trace fumed silica (3 wt%) to construct nanocarbon with predominant mesoporosity (96% mesopore surface area). The obtained material features uniform 6 ~ 8 nm mesopores and well-defined nanostructures. Systematic characterization indicates that the fumed silica simultaneously blocks existing micropores and suppresses new micropore formation during carbonization, reducing microporosity to 3% surface area. When supporting low Pt loading (5 wt%), this mesoporous carbon demonstrates superior oxygen reduction reaction (ORR) durability, showing a 30 mV half-wave potential shift after 30,000 cycles under accelerated durability testing. This performance surpasses commercial Pt/C (64 mV shift after 3,000 cycles) by an order of magnitude in cycle stability. Enhanced durability correlates with the fumed silica radical scavenging capability. This pore-engineering approach offers a practical route to design stable catalyst support through controlled mesopore construction.