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Supplementary Information files for: Electronic coupling strategy to boost water oxidation efficiency based on the modelling of Trimetallic Hydroxides Ni1-x-yFexCry(OH)2: from theory to experiment

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posted on 09.07.2020, 14:59 by Jun Ma, Pengsong Li, Xiao Lin, Yijun Huang, Yang Zhong, Lipeng Zhang, Xiaoming Sun, Daojin Zhou, Wen-Feng LinWen-Feng Lin, Zhenhai Xia
Supplementary Information files for: Electronic coupling strategy to boost water oxidation efficiency based on the modelling of Trimetallic Hydroxides Ni1-x-yFexCry(OH)2: from theory to experiment. Developing low-cost yet highly efficient earth-abundant electrocatalysts for oxygen evolution reaction (OER) is of great significance for industrial scale water splitting for clean hydrogen production, as well as for rechargeable metal-air batteries. In searching for advanced catalysts, it is equally important to fundamentally understand working mechanism and be able to rationally design and manipulate catalytic sites. Starting from density functional theory (DFT) calculations as a guidance, our theoretical model revealed that chromium substitution in nickel-iron hydroxides (Ni1-xFex(OH)2) not only accelerated the charge transfer but also regulated the adsorption energy of OER intermediates such to achieve optimal binding strength. Experimentally, chromium was doped into the laminate of Ni1- xFex(OH)2, resulting in enhanced catalytic performance for oxygen evolution reaction, which confirmed the predictions from the theoretical data. The porous and ultra-thin ternary Ni1-xyFexCry(OH)2 electrocatalysts were grown directly on a nickel foam (NF) substrate, with an optimum composition Ni0.66Fe0.27Cr0.07(OH)2/NF identified, which exhibited a superior OER performance, i.e., achieving a significant current density of 10 mA cm-2 at a low overpotential of 231 mV, a small Tafel slope (31 mV dec-1) and an excellent stability at a highly oxidative potential of 1.68 V vs RHE in alkaline electrolyte. The comprehensive study involving both theoretical and experimental results in this work provides an insightful guidance in designing efficient OER catalysts for chemical and electrical energy conversion and storage.

Funding

National Key Research and Development Project (2016YFF0204402 and 2017YFA0206500)

Basic theory and application research of metal-free carbon-based optical/electrocatalytic materials for constructing a new photoelectric conversion system

National Natural Science Foundation of China

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Program for Changjiang Scholars and Innovative Research Team in the University (IRT1205), US National Science Foundation (1561886)

Newton Advanced Fellowship award (NAF\R1\191294)

History

School

  • Science

Department

  • Chemical Engineering