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Fine regulation of self-supporting metal phosphonates for improved overall water splitting.

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Title: Fine regulation of self-supporting metal phosphonates for improved overall water splitting.
Authors: Wang, Li-Wen1 (AUTHOR), Yang, Wen-Peng1 (AUTHOR), Wang, Fu-Min1 (AUTHOR), Tang, Si-Fu1 (AUTHOR) tangsf@qau.edu.cn
Source: International Journal of Hydrogen Energy. Nov2024, Vol. 90, p775-783. 9p.
Subjects: Chemical kinetics, Transition metals, Water electrolysis, Hydrogen as fuel, Catalytic activity
Abstract: The exploration of high-performance water electrolysis catalysts is crucial for the development of hydrogen energy and the alleviation of increasingly serious environmental problems. Transition metal phosphonates are very promising electrocatalysts. In this work, a new nickel phosphonate has been synthesized and successfully developed into high-performance electrocatalyst through in-situ growth on nickel foam (NF), introduction of iron, and adjustment of Ni:Fe mole ratio. It is revealed that NiFe12 and NIFe13 exhibit the best OER (η 10 : 268 mV vs. RHE; Tafel slope: 54 mV dec−1) and HER (η 10 : 172 mV vs. RHE; Tafel slope: 77 mV dec−1) catalytic activity under optimized conditions, respectively, with fast reaction kinetics and long-term durability. The water electrolysis device assembled with them can drive a current density of 10 mA cm−2 at low voltage (1.68 V) with long-term durability, demonstrating promising application prospects. This work has important reference significance for the development of transition metal-based water electrolysis catalysts. [Display omitted] • A nickel phosphonate with two-dimensional crystal structure has been synthesized. • Nickel phosphonate can be developed into high-performance electrocatalyst. • The nickel phosphonate is in situ grown on nickel foam and doped with iron. • The OER and HER performance can be optimized by finely altering the Ni:Fe ratio. • Transition metal phosphonates are very promising electrocatalysts. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The exploration of high-performance water electrolysis catalysts is crucial for the development of hydrogen energy and the alleviation of increasingly serious environmental problems. Transition metal phosphonates are very promising electrocatalysts. In this work, a new nickel phosphonate has been synthesized and successfully developed into high-performance electrocatalyst through in-situ growth on nickel foam (NF), introduction of iron, and adjustment of Ni:Fe mole ratio. It is revealed that NiFe12 and NIFe13 exhibit the best OER (η 10 : 268 mV vs. RHE; Tafel slope: 54 mV dec−1) and HER (η 10 : 172 mV vs. RHE; Tafel slope: 77 mV dec−1) catalytic activity under optimized conditions, respectively, with fast reaction kinetics and long-term durability. The water electrolysis device assembled with them can drive a current density of 10 mA cm−2 at low voltage (1.68 V) with long-term durability, demonstrating promising application prospects. This work has important reference significance for the development of transition metal-based water electrolysis catalysts. [Display omitted] • A nickel phosphonate with two-dimensional crystal structure has been synthesized. • Nickel phosphonate can be developed into high-performance electrocatalyst. • The nickel phosphonate is in situ grown on nickel foam and doped with iron. • The OER and HER performance can be optimized by finely altering the Ni:Fe ratio. • Transition metal phosphonates are very promising electrocatalysts. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2024.10.021