Title: Mesoporous Ni₆₀Fe₃₀Mn₁₀-alloy based metal/metal oxide composite thick films as highly active and robust oxygen evolution catalysts

Abstract

A major challenge in the field of water electrolysis is the scarcity of oxygen-evolving catalysts that are inexpensive, highly corrosion-resistant, suitable for large-scale applications and able to oxidize water at high current densities and low overpotentials. Most unsupported, non-precious metals oxygen-evolution catalysts require at least ~350 mV overpotential to oxidize water with a current density of 10 mA cm^–2 in 1 M alkaline solution. In this paper we report on a robust nanostructured porous NiFe-based oxygen evolution catalyst made by selective alloy corrosion. In 1 M KOH, our material exhibits a catalytic activity towards water oxidation of 500 mA cm^–2 at 360 mV overpotential and is stable for over eleven days. This exceptional performance is attributed to three factors. First, the small size of the ligaments and pores in our mesoporous catalyst (~10 nm) results in a high BET surface area (43 m² g^–1) and therefore a high density of oxygen-evolution catalytic sites per unit mass. Second, the open porosity facilitates effective mass transfer at the catalyst/electrolyte interface. Third and finally, the high bulk electrical conductivity of the mesoporous catalyst allows for effective current flow through the electrocatalyst, making it possible to use thick films with a high density ofmore » active sites and ~3 × 10⁴ cm² of catalytic area per cm² of electrode area. Our mesoporous catalyst is thus attractive for alkaline electrolyzers where water-based solutions are decomposed into hydrogen and oxygen as the only products, driven either conventionally or by photovoltaics.« less

Authors:

Detsi, Eric ^[1]; Cook, John B. ^[1]; Lesel, Benjamin K. ^[1]; Turner, Christopher L. ^[1]; Liang, Yu-Lun ^[1]; Robbennolt, Shauna ^[1]; Tolbert, Sarah H. ^[1]

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+ Show Author Affiliations

1. Univ. of California, Los Angeles, CA (United States)

Publication Date:

Wed Dec 09 00:00:00 EST 2015

Research Org.:

Energy Frontier Research Centers (EFRC) (United States). Molecularly Engineered Energy Materials (MEEM)

Sponsoring Org.:

Netherlands Organization for Scientific Research (NWO); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institutes of Health (NIH)

OSTI Identifier:

1370231

Grant/Contract Number:  

SC0001342; 680-50-1214; SC0014213; 1S10RR23057

Resource Type:

Accepted Manuscript

Journal Name:

Energy & Environmental Science

Additional Journal Information:

Journal Volume: 9; Journal Issue: 2; Related Information: MEEM partners with University of California, Los Angeles (lead); University of California, Berkeley; Eastern Washington University; University of Kansas; National Renewable Energy Laboratory; Journal ID: ISSN 1754-5692

Publisher:

Royal Society of Chemistry

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY