双功能
电催化剂
催化作用
析氧
化学工程
材料科学
碳纳米管
碳化
X射线光电子能谱
化学
纳米技术
电极
电化学
有机化学
复合材料
物理化学
扫描电子显微镜
工程类
作者
Linyi Zhang,Yu Chen,Guangsheng Liu,Zhen Li,Song Liu,Santosh K. Tiwari,Oluwafunmilola Ola,Bingyan Pang,Nannan Wang,Yan Zhu
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-04-04
卷期号:7 (15): 12846-12855
被引量:7
标识
DOI:10.1021/acsomega.2c00123
摘要
Development of a low cost, high activity, and stable nonprecious metal bifunctional catalyst for electrocatalytic water cracking is a hot topic and big challenge. In this paper, we prepared a nitrogen-doped carbon nanotube (NCNT)-enhanced three-dimensional self-supported electrocatalyst with CoP and Co2P coexistence by a two-step strategy of high-temperature carbonization and low-temperature phosphorylation. Furthermore, the induced three-dimensional carbon network skeleton facilitates rapid charge transfer. In addition, the active sites of the carbon foam (CF) are greatly increased by the construction of hollow structures. As a bifunctional electrocatalyst, CoP/Co2P/NCNT@CF exhibited excellent catalytic activity for both hydrogen evolution reaction and oxygen evolution reaction in alkaline media, requiring low overpotentials of 133 and 289 mV to obtain a current density of 10 mA cm-2, respectively. Additionally, the synthesized catalysts also exhibit good long-term stability, maintaining high catalytic activity after 20 h of continuous operation. We also confirmed the main driving force to improve the electron transfer between the heterostructures of Co and P by XPS spectra. The excellent electrocatalytic performance can be attributed to the close synergy between the highly active CoP/Co2P/NCNT and CF. This study provides a new strategy for the design of highly active bifunctional self-supporting electrocatalysts.
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