3 research outputs found
Dual-Functional Starfish-like P‑Doped Co–Ni–S Nanosheets Supported on Nickel Foams with Enhanced Electrochemical Performance and Excellent Stability for Overall Water Splitting
Dual-functional
electrocatalysts have recently been reported to improve the conversion
and storage of energy generated from overall water splitting in alkaline
electrolytes. Herein, for the first time, a shape-controlled synthesis
of starfish-like Co–Ni–S nanosheets on three-dimensional
(3D) hierarchically porous nickel foams (Co–Ni–S/NF)
via a one-step hydrothermal method was developed. The influence of
reaction time on the nanosheet structure and properties was intensively
studied. After 11 h reaction, the Co–Ni–S/NF-11 sample
displays the most regular structure of nanosheets and the most outstanding
electrochemical properties. As to water splitting, hydrogen evolution
reaction (HER) and oxygen evolution reaction (OER) required overpotentials
of 284.3 and 296 mV, respectively, to provide a current density of
100 mA cm<sup>–2</sup>. The marvelous electrochemical performance
can be attributed to the conductive networks of 3D layered porous
nickel skeletons that are highly interconnected, which provided a
large specific area and highly active sites. To further enhance the
electrochemical performances of the electrocatalyst, the influence
of the doping of the P element was also studied. The results proved
that the P-doped Co–Ni–S/NF maintains the starfish structure
and demonstrates outstanding properties, providing a current density
of 100 mA cm<sup>–2</sup> with only 187.4 and 292.2 mV overpotentials
for HER and OER, respectively. It exhibited far more excellent properties
than reported dual-functional electrocatalysts. Additionally, when
used as an overall water-splitting catalyst, P–Co–Ni–S/NF
can provide a 10 mA cm<sup>–2</sup> current density at a given
cell voltage of 1.60 V in 1 M KOH, which is competitive to the best-known
electrocatalysts, with high long-term stability
Controlled Electrodeposition Synthesis of Co–Ni–P Film as a Flexible and Inexpensive Electrode for Efficient Overall Water Splitting
Synthesis
of highly efficient and robust catalysts with earth-abundant resources
for overall water splitting is essential for large-scale energy conversion
processes. Herein, a series of highly active and inexpensive Co–Ni–P
films were fabricated by a one-step constant current density electrodeposition
method. These films were demonstrated to be efficient bifunctional
catalysts for both H<sub>2</sub> and O<sub>2</sub> evolution reactions
(HER and OER), while deposition time was deemed to be the crucial
factor governing electrochemical performance. At the optimal deposition
time, the obtained Co–Ni–P-2 catalyst performed remarkably
for both HER and OER in alkaline media. In particular, it requires
−103 mV overpotential for HER and 340 mV for OER to achieve
the current density of 10 mA cm<sup>–2</sup>, with corresponding
Tafel slopes of 33 and 67 mV dec<sup>–1</sup>. Moreover, it
outperforms the Pt/C//RuO<sub>2</sub> catalyst and only needs −160
mV (430 mV) overpotential for HER (OER) to achieve 200 mA cm<sup>–2</sup> current density. Co–Ni–P electrodes were also conducted
for the proof-of-concept exercise, which were proved to be flexible,
stable, and efficient, further opening a new avenue for rapid synthesis
of efficient, flexible catalysts for renewable energy resources
Controlled Electrodeposition Synthesis of Co–Ni–P Film as a Flexible and Inexpensive Electrode for Efficient Overall Water Splitting
Synthesis
of highly efficient and robust catalysts with earth-abundant resources
for overall water splitting is essential for large-scale energy conversion
processes. Herein, a series of highly active and inexpensive Co–Ni–P
films were fabricated by a one-step constant current density electrodeposition
method. These films were demonstrated to be efficient bifunctional
catalysts for both H<sub>2</sub> and O<sub>2</sub> evolution reactions
(HER and OER), while deposition time was deemed to be the crucial
factor governing electrochemical performance. At the optimal deposition
time, the obtained Co–Ni–P-2 catalyst performed remarkably
for both HER and OER in alkaline media. In particular, it requires
−103 mV overpotential for HER and 340 mV for OER to achieve
the current density of 10 mA cm<sup>–2</sup>, with corresponding
Tafel slopes of 33 and 67 mV dec<sup>–1</sup>. Moreover, it
outperforms the Pt/C//RuO<sub>2</sub> catalyst and only needs −160
mV (430 mV) overpotential for HER (OER) to achieve 200 mA cm<sup>–2</sup> current density. Co–Ni–P electrodes were also conducted
for the proof-of-concept exercise, which were proved to be flexible,
stable, and efficient, further opening a new avenue for rapid synthesis
of efficient, flexible catalysts for renewable energy resources