Bimetallic‐MOF Derived Carbon with Single Pt Anchored C4 Atomic Group Constructing Super Fuel Cell with Ultrahigh Power Density And Self‐Change Ability

Abstract

AbstractPursuing high power density with low platinum catalysts loading is a huge challenge for developing high‐performance fuel cells (FCs). Herein, a new super fuel cell (SFC) is proposed with ultrahigh output power via specific electric double‐layer capacitance (EDLC) + oxygen reduction reaction (ORR) parallel discharge, which is achieved using the newly prepared catalyst, single‐atomic platinum on bimetallic metal‐organic framework (MOF)‐derived hollow porous carbon nanorods (PtSA/HPCNR). The PtSA‐1.74/HPCNR‐based SFC has a 3.4‐time higher transient specific power density and 13.3‐time longer discharge time with unique in situ self‐charge and energy storage ability than 20% Pt/C‐based FCs. X‐ray absorption fine structure, aberration‐corrected high‐angle annular dark‐field scanning transmission electron microscope, and density functional theory calculations demonstrate that the synergistic effect of Pt single‐atoms anchored on carbon defects significantly boosts its electron transfer, ORR catalytic activity, durability, and rate performance, realizing rapid “ ORR+EDLC” parallel discharge mechanism to overcome the sluggish ORR process of traditional FCs. The promising SFC leads to a new pathway to boost the power density of FCs with extra‐low Pt loading.