Well-Defined Metal Nanoparticles for Electrocatalysis
9
Citation
119
Reference
10
Related Paper
Citation Trend
Keywords:
Nanomaterial-based catalyst
Electrochemical energy conversion
Oxygen evolution
Abstract Sustainable production of H 2 through electrochemical water splitting is of great importance in the foreseeable future. Transition‐metal metaphosphates (TMMPs) have a three‐dimensional (3D) open‐framework structure and a high content of P (which exists as PO 3 − ), and therefore have been recognized as highly efficient catalysts for oxygen evolution reaction (OER) and the bottleneck of electrochemical water splitting. Furthermore, TMMPs can also contribute to hydrogen evolution reaction (HER) in alkaline and neutral media by facilitating water dissociation, and thus, overall water splitting can be achieved using this kind of material. In this timely review, we summarize the recent advances in the synthesis of TMMPs and their applications in OER and HER. We present a brief introduction of the structure and synthetic strategies of TMMPs in the first two parts. Then, we review the latest progress made in research on TMMPs as OER, HER, and overall water‐splitting electrocatalysts. In this part, the intrinsic activity of TMMPs as well as the current strategy for improving the catalytic activity will be discussed systematically. Finally, we present the future opportunities and the remaining challenges for the application of TMMPs in the electrocatalysis field.
Oxygen evolution
Electrolysis of water
Cite
Citations (49)
Oxygen evolution
Overpotential
Cite
Citations (31)
Oxygen evolution
Overpotential
Alkaline earth metal
Cite
Citations (113)
Exploring noble-metal-free electrocatalysts with high efficiency for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) holds promise for advancing the production of H2 fuel through water splitting. Herein, one-pot synthesis was introduced for MoS2–Ni3S2 heteronanorods supported by Ni foam (MoS2–Ni3S2 HNRs/NF), in which the Ni3S2 nanorods were hierarchically integrated with MoS2 nanosheets. The hierarchical MoS2–Ni3S2 heteronanorods allow not only the good exposure of highly active heterointerfaces but also the facilitated charge transport along Ni3S2 nanorods anchored on conducting nickel foam, accomplishing the promoted kinetics and activity for HER, OER, and overall water splitting. The optimal MoS2–Ni3S2 HNRs/NF presents low overpotentials (η10) of 98 and 249 mV to reach a current density of 10 mA cm–2 in 1.0 M KOH for HER and OER, respectively. Assembled as an electrolyzer for overall water splitting, such heteronanorods show a quite low cell voltage of 1.50 V at 10 mA cm–2 and remarkable stability for more than 48 h, which are among the best values of current noble-metal-free electrocatalysts. This work elucidates a rational design of heterostructures as efficient electrocatalysts, shedding some light on the development of functional materials in energy chemistry.
Oxygen evolution
Nanorod
Noble metal
Electrolysis of water
Cite
Citations (1,039)
Oxygen evolution
Cite
Citations (29)
Oxygen evolution
Electrochemical energy conversion
Cite
Citations (351)
In article number 1904688, Jian Zhang, Xing'ao Li, and co-workers present atom-scale modulation of electronic regulation in nonprecious-based electrocatalysts VOOH-3Fe (3% Fe, mole ratio) exhibiting a low overpotential of 90, 195 and 300 mV at the current density of 10 mA cm−2 for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and overall water splitting in alkaline media, respectively.
Overpotential
Oxygen evolution
Cite
Citations (27)
Abstract The sustainable and scalable production of hydrogen through hydrogen evolution reaction (HER) and oxygen through oxygen evolution reaction (OER) in water splitting demands efficient and robust electrocatalysts. Currently, state‐of‐the‐art electrocatalysts of Pt and IrO 2 /RuO 2 exhibit the benchmark catalytic activity toward HER and OER, respectively. However, expanding their practical application is hindered by their exorbitant price and scarcity. Therefore, the development of alternative effective electrocatalysts for water splitting is crucial. In the last few decades, substantial effort has been devoted to the development of alternative HER/OER and water splitting catalysts based on various transition metals (including Fe, Co, Ni, Mo, and atomic Pt) which show promising catalytic activities and durability. In this review, after a brief introduction and basic mechanism of HER/OER, the authors systematically discuss the recent progress in design, synthesis, and application of single atom and cluster‐based HER/OER and water splitting catalysts. Moreover, the crucial factors that can tune the activity of catalysts toward HER/OER and water splitting such as morphology, crystal defects, hybridization of metals with nonmetals, heteroatom doping, alloying, and formation of metals inside graphitic layered materials are discussed. Finally, the existing challenges and future perspectives for improving the performance of electrocatalysts for water splitting are addressed.
Oxygen evolution
Nanomaterials
Cite
Citations (662)
Abstract Bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline electrolyte may improve the efficiency of overall water splitting. Nickel cobaltite (NiCo 2 O 4 ) has been considered a promising electrode material for the OER. However, NiCo 2 O 4 that can be used as an electrocatalyst in HER has not been studied yet. Herein, we report self‐assembled hierarchical NiCo 2 O 4 hollow microcuboids for overall water splitting including both the HER and OER reactions. The NiCo 2 O 4 electrode shows excellent activity toward overall water splitting, with 10 mA cm −2 water‐splitting current reached by applying just 1.65 V and 20 mA cm −2 by applying just 1.74 V across the two electrodes. The synthesis of NiCo 2 O 4 microflowers confirms the importance of structural features for high‐performance overall water splitting.
Oxygen evolution
Cobaltite
Cite
Citations (627)