材料科学
空位缺陷
电化学
氢
纳米技术
制氢
化学物理
结晶学
物理化学
电极
有机化学
化学
物理
作者
Wei Nie,Tao Ren,Wen Zhang,Bingqing Yao,Wenhao Yuan,Xuan Li,Maha Abdullah,Jiaxun Zhang,Qiyuan Liu,Tianqing Zhang,Shang-Feng Tang,Chi He,Yiyun Fang,Xinzhe Li
标识
DOI:10.1021/acsami.4c01273
摘要
Two-dimensional (2D) van der Waals materials are increasingly seen as potential catalysts due to their unique structures and unmatched properties. However, achieving precise synthesis of these remarkable materials and regulating their atomic and electronic structures at the most fundamental level to enhance their catalytic performance remain a significant challenge. In this study, we synthesized single-crystal bulk PtTe crystals via chemical vapor transport and subsequently produced atomically thin, large PtTe nanosheets (NSs) through electrochemical cathode intercalation. These NSs are characterized by a significant presence of Te vacancy pairs, leading to undercoordinated Pt atoms on their basal planes. Experimental and theoretical studies together reveal that Te vacancy pairs effectively optimize and enhance the electronic properties (such as charge distribution, density of states near the Fermi level, and d-band center) of the resultant undercoordinated Pt atoms. This optimization results in a significantly higher percentage of dangling O-H water, a decreased energy barrier for water dissociation, and an increased binding affinity of these Pt atoms to active hydrogen intermediates. Consequently, PtTe NSs featuring exposed and undercoordinated Pt atoms demonstrate outstanding electrocatalytic activity in hydrogen evolution reactions, significantly surpassing the performance of standard commercial Pt/C catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI