Title

Nanoscale heterogeneities of non-noble iron-based metallic glasses toward efficient water oxidation at industrial-level current densities

Document Type

Journal Article

Publication Title

ACS Applied Materials and Interfaces

Volume

14

Issue

8

First Page

10288

Last Page

10297

PubMed ID

35175044

Publisher

ACS

School

School of Engineering

RAS ID

43670

Funders

National Natural Science Foundation of China

Grant Number

2020A1515110236

Comments

Jia, Z., Zhao, Y., Wang, Q., Lyu, F., Tian, X., Liang, S. X., ... & Shen, B. (2022). Nanoscale Heterogeneities of Non-Noble Iron-Based Metallic Glasses toward Efficient Water Oxidation at Industrial-Level Current Densities. ACS Applied Materials & Interfaces, 14, 8, 10288–10297. https://doi.org/10.1021/acsami.1c22294

Abstract

Scaling up the production of cost-effective electrocatalysts for efficient water splitting at the industrial level is critically important to achieve carbon neutrality in our society. While noble-metal-based materials represent a high-performance benchmark with superb activities for hydrogen and oxygen evolution reactions, their high cost, poor scalability, and scarcity are major impediments to achieve widespread commercialization. Herein, a flexible freestanding Fe-based metallic glass (MG) with an atomic composition of Fe50Ni30P13C7was prepared by a large-scale metallurgical technique that can be employed directly as a bifunctional electrode for water splitting. The surface hydroxylation process created unique structural and chemical heterogeneities in the presence of amorphous FeOOH and Ni2P as well as nanocrystalline Ni2P that offered various active sites to optimize each rate-determining step for water oxidation. The achieved overpotentials for the oxygen evolution reaction were 327 and 382 mV at high current densities of 100 and 500 mA cm-2in alkaline media, respectively, and a cell voltage of 1.59 V was obtained when using the MG as both the anode and the cathode for overall water splitting at a current density of 10 mA cm-2. Theoretical calculations unveiled that amorphous FeOOH makes a significant contribution to water molecule adsorption and oxygen evolution processes, while the amorphous and nanocrystalline Ni2P stabilize the free energy of hydrogen protons (ΔGH*) in the hydrogen evolution process. This MG alloy design concept is expected to stimulate the discovery of many more high-performance catalytic materials that can be produced at an industrial scale with customized properties in the near future.

DOI

10.1021/acsami.1c22294

Access Rights

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Research Themes

Natural and Built Environments

Priority Areas

Engineering, technology and nanotechnology

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