Constructing double-shell structured N-C-in-Co/N-C electrocatalysts with nanorod- and rhombic dodecahedron-shaped hollow morphologies to boost electrocatalytic activity for hydrogen evolution and triiodide reduction reaction

被引：67

作者：

Dang, Jiaoe ^{[1
]}

Yun, Sining ^{[1
,2
]}

Zhang, Yongwei ^{[1
]}

Yang, Jingjing ^{[1
]}

Liu, Zhuolei ^{[1
]}

Dang, Changwei ^{[1
]}

Wang, Yinhao ^{[1
]}

Deng, Yingying ^{[1
]}

机构：

[1] Xian Univ Architecture & Technol, Sch Mat Sci & Engn, Funct Mat Lab FML, Xian 710055, Shaanxi, Peoples R China

[2] Qinghai Bldg & Mat Res Acad Co Ltd, Key Lab Plateau Bldg & Ecocommunity Qinghai, Xining 810000, Qinghai, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 449卷

关键词：

Metal -organic frameworks; Double -shell structure; Triiodide reduction reaction; Hydrogen evolution reaction; Dye -sensitized solar cells; Counter electrode; METAL-ORGANIC FRAMEWORK; EFFICIENT BIFUNCTIONAL ELECTROCATALYST; OXYGEN REDUCTION; POROUS CARBON; COBALT NANOPARTICLES; COUNTER ELECTRODE; ACTIVATION STRATEGY; SURFACE-AREA; PERFORMANCE; CATALYST;

D O I：

10.1016/j.cej.2022.137854

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

With the increasing energy demands and impending climate change, significant concerns have been raised over the metal-organic frameworks (MOFs)-derived porous carbons and their utilization for hydrogen evolution re-action (HER) and triiodide reduction reaction (IRR). However, the provision of high intrinsic activity, active-site accessibility, and structural stability of MOF-derived Co-embedded N-doped carbon (Co/N-C) for HER and IRR is challenging. In this work, core-shell MOF-in-MOF precursors are designed to construct novel double-shell N-C-in-Co/N-C electrocatalysts with nanorod-and rhombic dodecahedron-shaped hollow morphologies (NR-H-C and RD-H-C). The double-shell structured NR-H-C and RD-H-C significantly enhance the HER and IRR activity of Co-MOF-derived Co/N-C. Specifically, NR-H-C achieves a high N-content (10.35 at.%), large specific surface area (590.87 m(2) g(-1)), and hierarchical porous configuration (micropores and mesopores). When NR-H-C is applied as the HER catalyst in alkaline electrolyte, it exhibits an admired overpotential of 123 mV at 10 mA cm(-2) and a Tafel slope of 51 mV dec(-1). The solar cell adopting NR-H-C as counter electrode for IRR achieves a high short circuit current density of 16.77 mA cm(-2), an open-circuit voltage of 0.745 V, a fill factor of 0.682, and a power conversion efficiency of 8.51%, higher than that of Pt-based solar cell (16.26 mA cm(-2), 0.744 V, 0.602, and 7.28%). The elucidatory Volmer-Heyrovsky HER mechanism and reversed Volmer-Heyrovsky IRR mechanism give a better understanding of the enhanced dual-functional activity of NR-H-C. This work provides an essential information for the rational design of high-performance dual-functional HER and IRR catalysts and further open up a new avenue for the construction of multicomponent MOFs in the energy conversion field.

引用

页数：18