Ru/RuO <sub>2</sub> Heterostructures for Stable and Active Acidic Water Oxidation via Interfacial Charge Redistribution and Lattice‐Oxygen Participation
Abstract
ABSTRACT The rational design and synthesis of Ir‐free acidic oxygen evolution catalysts combining high activity with long‐term durability remains a formidable challenge. This work demonstrates an addressable and dopant‐free strategy through the construction of Ru/RuO 2 heterostructures in a solely Ru‐based system, wherein interfacial charge redistribution and lattice‐oxygen participation jointly promote catalytic enhancement. The catalyst delivers an overpotential of 182 mV at 10 mA·cm −2 and retains operational durability for over 270 h at 100 mA·cm −2 in 0.5 M H 2 SO 4 . Spectroscopic characterizations, including X‐ray absorption spectroscopy (XAS), Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS), coupled with theoretical calculations, elucidate that interfacial electron transfer from metallic‐Ru phase to RuO 2 phase, assisted by the formation of a built‐in electric field, results in increased work functions across the heterointerface and lowered interfacial Ru oxidation states, suppressing Ru‐site overoxidation into soluble RuO 4 and accounting for the exceptional durability. Lattice‐oxygen participation, which corresponds to excellent activity, was verified by operando investigations, including differential electrochemical mass spectrometry (DEMS), attenuated total reflection surface‐enhanced infrared absorption spectroscopy (ATR‐SEIRAS), and tetramethylammonium (TMA + ) chemical probing. The overall findings establish heterointerface engineering as a powerful tool for the simultaneous enhancement of the coupled activity‐stability in Ru‐based acidic OER catalysts.
Article Details
Authors (21)
Minqian Cheng
State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing P. R. China
Hanlin Ding
Shiyao Chen
Simin He
State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing P. R. China
Shitao Min
State Key Laboratory of Chemical Resource Engineering, College of Chemistry
HaoCheng Wang
Yumeng Wang
Key Laboratory of Multi-Cell Systems, Shanghai Institute of Biochemistry and Cell Biology, Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, University of Chinese Academy of Sciences
Fulin Li
State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing P. R. China
Zhouqing Gu
State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing P. R. China
Yixin Zhang
Aiqing Cao
State Key Laboratory of Chemical Resource Engineering, College of Chemistry
Jingjin Cheng
State Key Laboratory of Chemical Resource Engineering, College of Chemistry
Yaling Zhang
State Key Laboratory of Chemical Resource Engineering, College of Chemistry
Dan Kang
Gang Ma
Yun Hu
Huijun Xin
Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in Shenzhen Shenzhen P. R. China
Yun Kuang
Ocean Hydrogen Energy R&D Center
Yaping Li
State Key Laboratory of Chemical Resource Engineering, College of Chemistry
Daojin Zhou
Xiaoming Sun