Cobalt Molybdenum Nitride-Based Nanosheets for Seawater Splitting

作者：Xiang Wang, Xu Han, Ruifeng Du, Congcong Xing, Xueqiang Qi, Zhifu Liang, Pablo Guardia, Jordi Arbiol, Andreu Cabot, Junshan Li · 发表于：ACS Applied Materials & Interfaces · 年份：2022 · DOI：10.1021/acsami.2c09272 · 被引用次数：96 · 研究领域：Electrocatalysts for Energy Conversion、Advanced Photocatalysis Techniques、Ammonia Synthesis and Nitrogen Reduction

The development of cost-effective bifunctional catalysts for water electrolysis is both a crucial necessity and an exciting scientific challenge. Herein, a simple approach based on a metal–organic framework sacrificial template to preparing cobalt molybdenum nitride supported on nitrogen-doped carbon nanosheets is reported. The porous structure of produced composite enables fast reaction kinetics, enhanced stability, and high corrosion resistance in critical seawater conditions. The cobalt molybdenum nitride-based electrocatalyst is tested toward both oxygen evolution reaction and hydrogen evolution reaction half-reactions using the seawater electrolyte, providing excellent performances that are rationalized using density functional theory. Subsequently, the nitride composite is tested as a bifunctional catalyst for the overall splitting of KOH-treated seawater from the Mediterranean Sea. The assembled system requires overpotentials of just 1.70 V to achieve a current density of 100 mA cm –2 in 1 M KOH seawater and continuously works for over 62 h. This work demonstrates the potential of transition-metal nitrides for seawater splitting and represents a step forward toward the cost-effective implementation of this technology.