RT Conference Proceedings
T1 Preparation and Properties of Proton Conductors and HER Electrocatalysts Based on Multifunctional Transition Metal Sulfophosphonates.
A1 Vílchez-Cózar, Álvaro
A1 Salcedo, Inés R.
A1 Xanthopoulos, Konstantinos
A1 Pérez-Colodrero, Rosario Mercedes
A1 Bazaga-García, Montse
A1 Demadis, Konstantinos D.
A1 Olivera-Pastor, Pascual
A1 Cabeza-Díaz, Aurelio
K1 Rayos X - Difracción
K1 Estructura cristalina (Sólidos)
K1 Sincrotrones
K1 Catalizadores de metales de transición
AB Preparation and Properties of Proton Conductors and HER Electrocatalysts Based on Multifunctional Transition Metal SulfophosphonatesTransition metal phosphonates are multifunctional materials with potential applications in energy storage and conversion technologies [1]. These materials exhibit proton-conducting properties and are attractive precursors for the preparation of electrocatalysts [2,3]. Thus, their structurally tunable properties facilitate, on one hand, the formation of efficient proton transport pathways, and on the other, their pyrolytic conversion into electrocatalytically active transition metal phosphides or polyphosphates [4].Herein, we report the synthesis, structural diversity, and electrochemical characterization of a series of transition metal sulfophosphonates (M = Mn2+, Fe2+, Co2+, Zn2+) derived from 2-[bis(phosphonomethyl)amino]ethanesulfonic acid (SPA). Their crystal structures were determined using synchrotron and laboratory X-ray powder diffraction, allowing structure–property correlations to be established. Depending on the material composition, the proton conductivity values ranged from 10-4 S·cm-1 (Mn2+, Fe2+, and Co2+ derivatives) to 10-2 S·cm-1 (mixed NH4+/Zn2+ derivative) at 80°C and 95% relative humidity, with all compounds exhibiting a water-mediated proton transfer mechanism. In addition, among the transition metal materials pyrolyzed under (5%)H2–Ar atmosphere, the Co-based derivative treated at 700°C, consisting of mixed o-CoP and o-Co2P phases, exhibited the best performance in the hydrogen evolution reaction (HER), achieving overpotentials of only 91 and 95 mV at 10 mA·cm-2 under acidic and alkaline conditions, respectively, when supported on a CFP substrate.
AB References[1] P. Bhanja, J. Na, T. Jing, J. Lin, T. Wakihara, A. Bhaumik, Y. Yamauchi. Chem. Mater. 31 (2019), 5343–5362.[2] S.-S. Bao, G.K.H. Shimizu, L.-M. Zheng. Coord. Chem. Rev. 378 (2019), 577–594.[3] R. Zhang, S.M. El-Refaei, P.A. Russo, N. Pinna. J. Nanopart. Res. 20 (2018), 146.[4] Á. Vílchez-Cózar, R. M. P. Colodrero, M. Bazaga-García, D. Marrero-López, S. M. El-Refaei, P. A. Russo, N. Pinna, P. Olivera-Pastor, A. Cabeza. Appl. Catal. B 337 (2023), 122963.
YR 2025
FD 2025
LK https://hdl.handle.net/10630/39989
UL https://hdl.handle.net/10630/39989
LA eng
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026