Issue 14, 2024

An ultra-high mass-loading transition metal phosphide electrocatalyst for efficient water splitting and ultra-durable zinc–air batteries

Abstract

The development of sustainable energy conversion and storage technologies is an effective approach to relieve the increasingly severe global energy crisis. Herein, a facile reductive electrosynthesis approach, using Pluronic P123 as a structure-directing agent, is reported to prepare an electrically conductive, electrochemically stable, and porous Ni–Co–Mn phosphide (NCMP) electrocatalyst with a super-high mass loading of 22.6 mg cm−2, feasible for industrial-level applications. The NCMP electrocatalyst exhibits superior trifunctional electrocatalytic activities toward the hydrogen evolution reaction (ηj=10 = 100 mV), oxygen evolution reaction (ηj=50 = 218 mV), and oxygen reduction reaction (half-wave potential = 0.74 V vs. reversible hydrogen electrode) in alkaline electrolytes. The NCMP-based cell delivers an overall water-splitting voltage of 1.53 V at a rate of 10 mA cm−2, which is lower than that of the benchmark Pt/C(−)–RuO2/C(+) system. The NCMP-based zinc–air battery exhibits a high power density of 148 mW cm−2, a high specific energy of ∼932 W h kgZn−1, and excellent cycling stability of over 6000 cycles at 5 mA cm−2. Mechanistic studies through theoretical calculations revealed that a trimetallic species formed by Ni, Co, and Mn is the most catalytically active site. It is anticipated that this novel reductive electrosynthesis approach may extend to other electrodeposition processes and pave the way to better meet the existing and expected energy demands.

Graphical abstract: An ultra-high mass-loading transition metal phosphide electrocatalyst for efficient water splitting and ultra-durable zinc–air batteries

Supplementary files

Article information

Article type
Paper
Submitted
04 jan 2024
Accepted
07 jun 2024
First published
20 jun 2024

Energy Environ. Sci., 2024,17, 5200-5215

An ultra-high mass-loading transition metal phosphide electrocatalyst for efficient water splitting and ultra-durable zinc–air batteries

N. Khodayar, A. Noori, M. S. Rahmanifar, M. Moloudi, N. Hassani, M. Neek-Amal, M. F. El-Kady, N. B. Mohamed, X. Xia, Y. Zhang, R. B. Kaner and M. F. Mousavi, Energy Environ. Sci., 2024, 17, 5200 DOI: 10.1039/D4EE00042K

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