Catalysis by design: development of a bifunctional water splitting catalyst through an operando measurement directed optimization cycle.

Chemical Science
Nikolay KornienkoErwin Reisner

Abstract

A critical challenge in energy research is the development of earth abundant and cost-effective materials that catalyze the electrochemical splitting of water into hydrogen and oxygen at high rates and low overpotentials. Key to addressing this issue lies not only in the synthesis of new materials, but also in the elucidation of their active sites, their structure under operating conditions and ultimately, extraction of the structure-function relationships used to spearhead the next generation of catalyst development. In this work, we present a complete cycle of synthesis, operando characterization, and redesign of an amorphous cobalt phosphide (CoP x ) bifunctional catalyst. The research was driven by integrated electrochemical analysis, Raman spectroscopy and gravimetric measurements utilizing a novel quartz crystal microbalance spectroelectrochemical cell to uncover the catalytically active species of amorphous CoP x and subsequently modify the material to enhance the activity of the elucidated catalytic phases. Illustrating the power of our approach, the second generation cobalt-iron phosphide (CoFePx) catalyst, developed through an iteration of the operando measurement directed optimization cycle, is superior in both hydro...Continue Reading

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Citations

Feb 15, 2020·Chemical Science·Kévin LemoineNikolay Kornienko
Jun 17, 2020·Chemical Society Reviews·Xin FangErwin Reisner
Apr 30, 2019·Frontiers in Chemistry·Matthew G QuesneC Richard A Catlow
May 3, 2019·Accounts of Chemical Research·Nikolay KornienkoErwin Reisner

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Methods Mentioned

BETA
X-ray
quartz crystal microbalance
chip
infrared spectroscopy
transmission electron microscopy

Software Mentioned

Labspec
Rad Win - IR Pro
Neofox Viewer
Artemis
XANES
IFEFFIT
Feff
Bio
Athena

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