2026-06-07T05:34:02Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/398482026-02-03T12:03:08Zcom_10630_2254col_10630_37959
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Vílchez-Cózar, Álvaro
author
Pérez-Colodrero, Rosario Mercedes
author
Olivera-Pastor, Pascual
author
Cabeza-Díaz, Aurelio
2025-09-11T09:26:15Z
2025-09-11T09:26:15Z
2025
https://hdl.handle.net/10630/39848
Transition metal phosphonates have emerged as promising precursors for durable and
efficient electrocatalysts in alkaline water electrolysis (AWE) [1]. Through controlled pyrolysis
conditions, these materials are converted into transition metal phosphides or polyphosphates
with precisely tuned phase composition and morphology [2]. This process also results in
heteroatom-doped carbon matrices, which contribute to enhancing the conductivity and
preventing nanoparticle agglomeration. Therefore, the tunable chemistry of these precursors
allows for the design of tailored P-containing catalysts with optimized catalytic performance
for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
In this work, we report the synthesis and structural characterization of several divalent
transition metal phosphonates and their corresponding bimetallic derivatives derived from the
nitrilotris(methylenephosphonic) acid (NTMPA). These materials were employed as precursors
for the preparation of metal tetraphosphonates (M2P4O12) and metal phosphides (MxP) through
pyrolysis under N2 and (5%)H2-Ar atmospheres, respectively, at temperatures ranging from 500
to 800 ºC. Their electrocatalytic performance were thoroughly evaluated for the HER and OER,
and benchmarked against noble metal-based reference electrocatalysts. To establish structureperformance relationships, pair distribution function (PDF) and differential PDF analyses were
conducted to track the structural evolution and stability of the electrocatalysts during
electrochemical reactions [3]. Finally, the most effective catalysts were integrated into AWE
systems which, after catalyst loading optimization, achieved cell voltages and stability
comparable to those of noble metal-based systems.References [1] Y.-P. Zhu, Z.-Y. Yuan, H. N. Alshareef, ACS Materials Letters, 2, 582–594 (2020). [2] R. Zhang, S. M. El-Refaei, P. A. Russo, N. Pinna, Journal of Nanoparticle Research, 20, 146 (2018). [3] Á. Vílchez-Cózar, R. M. P. Colodrero, M. Bazaga-García, D. Marrero-López, S. M. ElRefaei, P. A. Russo, N. Pinna, P. Olivera-Pastor, A. Cabeza, Applied Catalysis B: Environmental, 337, 122963 (2023).
eng
Electrocatálisis
Compuestos organofosforados
Development of Transition Metal Nitrilotris(methylenephosphonate)-derived Electrocatalysts for Alkaline Water Electrolysis
conference output
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