双功能
材料科学
过电位
铂金
塔菲尔方程
制氢
色素敏化染料
贵金属
双功能催化剂
三碘化物
分解水
化学工程
催化作用
纳米技术
电化学
电极
有机化学
冶金
光催化
电解质
物理化学
化学
工程类
金属
作者
Ting Wang,Ming Xu,Chunhui Ma,Yitong Gu,Wei‐Chao Chen,Yunjiang Li,Jian Gong,Tuo Ji,Weilin Chen
标识
DOI:10.1021/acsami.1c06032
摘要
High-performance triiodide reduction reaction (IRR) catalysts in dye-sensitized solar cells (DSSCs) and hydrogen evolution reaction (HER) catalysts in electrochemical water splitting are extremely compelling for renewable energy conversion and storage. The best IRR and HER catalysts generally rely on the use of noble metal platinum (Pt), which suffers obstacles in real-world implementation. The rational design of efficient bifunctional IRR and HER catalysts based on inexpensive and earth-abundant elements to replace scarce Pt could enable low-cost photoelectric conversion and hydrogen production but is challenging and rarely reported. Herein, we present a bifunctional NiFeCoW@NC hybrid with the unique architecture of WC loaded on the in situ formed carbon nanotubes embedded with Co-doped FeNi3 nanoparticles based on the anisotropic integration design principle, which operates efficiently for DSSCs and hydrogen evolution. The assembled DSSCs using the designed multimetal-based NiFeCoW@NC counter electrode delivered a high power conversion efficiency of 6.92% and long-term stability superior to bimetal-based NiFe@NC, CoW@NC, and Pt counterparts. It also exhibited eminent hydrogen evolution performance with a low overpotential of 127.8 mV to drive a 10 mA cm–2 current density, a Tafel slope of 60.4 mV dec–1, and satisfactory durable stability in 0.5 M H2SO4. This work provides a design principle for low-cost and highly active bifunctional catalysts to replace Pt for DSSCs and hydrogen evolution.
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