RT Conference Proceedings
T1 Development of Transition Metal Nitrilotris(methylenephosphonate)-derived Electrocatalysts for Alkaline Water Electrolysis
A1 Vílchez-Cózar, Álvaro
A1 Pérez-Colodrero, Rosario Mercedes
A1 Olivera-Pastor, Pascual
A1 Cabeza-Díaz, Aurelio
K1 Electrocatálisis
K1 Compuestos organofosforados
AB Transition metal phosphonates have emerged as promising precursors for durable andefficient electrocatalysts in alkaline water electrolysis (AWE) [1]. Through controlled pyrolysisconditions, these materials are converted into transition metal phosphides or polyphosphateswith precisely tuned phase composition and morphology [2]. This process also results inheteroatom-doped carbon matrices, which contribute to enhancing the conductivity andpreventing nanoparticle agglomeration. Therefore, the tunable chemistry of these precursorsallows for the design of tailored P-containing catalysts with optimized catalytic performancefor both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).In this work, we report the synthesis and structural characterization of several divalenttransition metal phosphonates and their corresponding bimetallic derivatives derived from thenitrilotris(methylenephosphonic) acid (NTMPA). These materials were employed as precursorsfor the preparation of metal tetraphosphonates (M2P4O12) and metal phosphides (MxP) throughpyrolysis under N2 and (5%)H2-Ar atmospheres, respectively, at temperatures ranging from 500to 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 wereconducted to track the structural evolution and stability of the electrocatalysts duringelectrochemical reactions [3]. Finally, the most effective catalysts were integrated into AWEsystems which, after catalyst loading optimization, achieved cell voltages and stabilitycomparable to those of noble metal-based systems.
AB 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).
YR 2025
FD 2025
LK https://hdl.handle.net/10630/39848
UL https://hdl.handle.net/10630/39848
LA eng
NO Acknowledgments This work was supported by the Spanish Ministry of Economy, Industry and Competitiveness (projects PID2019-110249RB-I00, TED2021-129836B-I00 and PID2023-148883OB-I00, and the student grant PRE2020-094459).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026