问题描述：
英语翻译
The most active materials in the group catalyze
the ORR at potentials within 60 millivolts of that delivered by state-of-the-art carbon-supported
platinum,combining their high activity with remarkable performance stability for non–precious
metal catalysts (700 hours at a fuel cell voltage of 0.4 volts) as well as excellent four-electron
selectivity (hydrogen peroxide yield
The most active materials in the group catalyze
the ORR at potentials within 60 millivolts of that delivered by state-of-the-art carbon-supported
platinum,combining their high activity with remarkable performance stability for non–precious
metal catalysts (700 hours at a fuel cell voltage of 0.4 volts) as well as excellent four-electron
selectivity (hydrogen peroxide yield
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