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Title: Electronegativity-induced charge balancing to boost stability and activity of amorphous electrocatalysts
Authors: Zhou, Yao
Hao, Wei
Zhao, Xiaoxu
Zhou, Jiadong
Yu, Huimei
Lin, Bo
Liu, Zheng
Pennycook, Stephen J.
Li, Shuzhou
Fan, Hong Jin
Keywords: Engineering::Materials
Issue Date: 2022
Source: Zhou, Y., Hao, W., Zhao, X., Zhou, J., Yu, H., Lin, B., Liu, Z., Pennycook, S. J., Li, S. & Fan, H. J. (2022). Electronegativity-induced charge balancing to boost stability and activity of amorphous electrocatalysts. Advanced Materials, 34(11), e2100537-.
Project: A1983c0026 
MOE2016-T2-1- 131 
Journal: Advanced Materials
Abstract: Amorphization is an efficient strategy to activate intrinsically inert catalysts. However, the low crystallinity of amorphous catalysts often causes high solubility and poor electrochemical stability in aqueous solution. Here, a different mechanism is developed to simultaneously stabilize and activate the water-soluble amorphous MoSx Oy via a charge-balancing strategy, which is induced by different electronegativity between the co-dopants Rh (2.28) and Sn (1.96). The electron-rich Sn prefers to stabilize the unstable apical O sites in MoSx Oy through charge transfer, which can prevent the H from attacking. Meanwhile, the Rh, as the charge regulator, shifts the main active sites on the basal plane from inert Sn to active apical Rh sites. As a result, the amorphous RhSn-MoSx Oy exhibits drastic enhancement in electrochemical stability (η10 increases only by 12 mV) after 1000 cycles and a distinct activity (η10 : 26 mV and Tafel: 30.8 mV dec-1 ) for the hydrogen evolution reaction in acidic solution. This work paves a route for turning impracticably water-soluble catalysts into treasure and inspires new ideas to design high-performance amorphous electrocatalysts.
ISSN: 0935-9648
DOI: 10.1002/adma.202100537
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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