“…Hence, to solve these problems, various Pt-based bimetallic alloys (PtRu, PtPd, and PtSn) have been used to enhance the catalytic activity and reduce the cost; on the other hand, these Pt-based bimetallic electrocatalysts seriously suffer from heavy aggregation [16][17][18]. To address this problem, as an alternative to precious metals, to minimize the cost of the metal catalyst, and to reduce the catalyst poisoning, various carbon supports such as graphene [19,20], multiwall carbon nanotube [21], activated carbon [22], and carbon nanofibers [23] have often been used as supporting materials for both precious and non-precious functional materials. However, as an alternative to the existing commercial activated carbon, a large number of natural sources such as nutshell, coconut shell, peanut, sugarcane bagasse, sawdust, rice husks have been used to synthesize activated carbon [24][25][26][27][28][29].…”