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Hierarchical tri-functional electrocatalysts derived from bimetallic–imidazolate framework for overall water splitting and rechargeable zinc–air batteries

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/c9ta01340g· OSTI ID:1598255
 [1];  [2]
  1. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program, Texas Materials Institute; Chosun Univ., Gwangju (Korea); University of Texas at Austin
  2. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program, Texas Materials Institute
+ Show Author Affiliations

There is a growing need for an efficient multi-functional electrocatalyst that can produce industry-level high currents at low overpotentials. In this article, we report a highly efficient, robust tri-functional catalytic electrode that simultaneously catalyzes three different electrochemical reactions: the oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR). The catalytic electrodes with a hierarchical structure are converted from a hierarchical nickel-rich, nickel–cobalt bimetallic–imidazolate framework directly grown onto a nickel foam. Catalytic electrodes composed of bimetallic phosphides exhibit excellent OER and HER catalytic activity (an overpotential of 201/250 mV at 20/100 mA cm-2 for OER and an overpotential of 67/110 mV at 20/100 mA cm-2 for HER), as well as ORR activity with a half-wave potential at 0.82 V vs. RHE. Furthermore, the bimetal–nitrogen–carbon (M–N–C) catalytic electrode also exhibits tunable tri-functional catalytic activity, including excellent ORR activity with a half-wave potential at 0.88 V vs. RHE. Lastly, the high potential of these multi-functional electrocatalysts from single nickel-rich bimetallic–organic complexes is demonstrated by employing them as robust alkaline water electrolyzers, as well as decoupled air electrodes for rechargeable zinc–air batteries (ZABs).

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Research Foundation of Korea (NRF)
Grant/Contract Number:
SC0005397
OSTI ID:
1598255
Alternate ID(s):
OSTI ID: 1503944
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 14 Vol. 7; ISSN JMCAET; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Nanosheets assembled into nickel sulfide nanospheres with enriched Ni 3+ active sites for efficient water-splitting and zinc–air batteries journal January 2019

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