This study reports a high-performing nonprecious metal catalyst for the oxygen reduction reaction that is composed of highly dispersed Fe centered active sites on bamboolike carbon nanotubes. NH₂-MIL-88B is used as the iron source and ZIF-8 as the carbon source. The precursors are uniformly mixed by ball milling, which destroys their crystal structures. A bamboolike carbon nanotube network results from the pyrolysis of the mixed precursors. The morphology is controlled by the proportion of the precursors and the pyrolysis temperature. The catalyst shows excellent oxygen reduction activity in both half-cell and full-cell tests. The onset potential and half-wave potential are 0.96 and 0.78 V vs RHE, respectively. In the fuel cell test, the current density reaches 0.85 A cm^–2 at 0.7 V and 1.24 A cm^–2 at 0.6 V (iR-corrected). The novel synthesis approach of the highly dispersed catalyst provides new strategy in the design of high effective nonprecious metal catalysts for fuel cell.

中文翻译：

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质子交换膜燃料电池中用于氧还原反应的高度分散的非贵金属催化剂

这项研究报告了一种用于氧还原反应的高性能非贵金属催化剂，该催化剂由竹状碳纳米管上高度分散的以Fe为中心的活性中心组成。NH ₂ -MIL-88B用作铁源，ZIF-8用作碳源。通过球磨将前体均匀混合，这会破坏其晶体结构。混合前体的热解产生了竹状碳纳米管网络。形态由前体的比例和热解温度控制。该催化剂在半电池和全电池测试中均显示出出色的氧还原活性。相对于RHE，起始电势和半波电势分别为0.96 V和0.78V。在燃料电池测试中，电流密度达到0.85 A cm ^–2在0.7 V和1.24 A cm ^{–2的情况下}在0.6 V（经iR校正）。高分散催化剂的新颖合成方法为燃料电池高效非贵金属催化剂的设计提供了新的策略。