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Developing an efficient and economic synthetic approach to massively prepare non-precious-metal counter electrode (CE) electrocatalysts with superior catalytic activity and electrochemical stability is highly desirable for the commercialization of dye-sensitized solar cells (DSSCs). Herein, a unique electrocatalytic architecture of Co2P and Ni2P nanoparticles linked and semiexposed at the end points of nitrogen-doped carbon nanotubes (MxP-NCNTs) were first prepared by a metal-catalyzed graphitization-nitridization driven tip-growth process and the followed phosphonation and carbothermal reduction reaction. The prepared MxP-NCNTs were evaluated as CEs in DSSCs and showed high electrocatalytic activity, electrical conductivity, and electrochemical stability for triiodide reduction. The DSSCs assembled with Co2P-NCNTs and Ni2P-NCNTs CEs reached a high power conversion efficiency of 9.76% and 9.21%, respectively, exceeding the efficiency of conventional Pt-based device (7.84%). The extraordinary DSSCs' performance was mainly attributed to the structural advantages of MxP-NCNTs CE, in which the open porous nanotube arrays and integrated heterointerfacial connection in one-dimensional nanostructure of MxP-NCNTs accelerated the electron-ion transport, and the highly dispersed and semiexposed MxP nanocrystals improved the catalytic activity for triiodide reduction. This work provides a avenue to exploring highly effective and robust non-precious-metal CE electrocatalysts for DSSCs.
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ACS APPLIED ENERGY MATERIALS
ISSN: 2574-0962
Year: 2021
Issue: 12
Volume: 4
Page: 13952-13962
6 . 9 5 9
JCR@2021
5 . 5 0 0
JCR@2023
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:142
JCR Journal Grade:1
CAS Journal Grade:3
Cited Count:
WoS CC Cited Count: 16
SCOPUS Cited Count: 15
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 3
Affiliated Colleges: