Hydrogen Evolution: Embedding RhP<i><sub>x</sub></i> in N, P Co‐Doped Carbon Nanoshells Through Synergetic Phosphorization and Pyrolysis for Efficient Hydrogen Evolution (Adv. Funct. Mater. 33/2019)

Chi, Jing‐Qi; Zeng, Xiaojun; Shang, Xiao; Dong, Bin; Chai, Yong‐Ming; Liu, Chenguang; Marin, Melinda; Yin, Yadong

doi:10.1002/adfm.201970230

Cited by 13 publications

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“…Upon heating, NaH 2 PO 2 would decompose to generate PH 3 gas, converting the Co(OH) 2 into CoP. [ 27 ] Simultaneously, Co(OH) 2 could dehydrate under appropriate condition, forming CoO‐CoP porous heterostructure. Finally, CoFe PBA cubes were formed by in situ reaction of CoO with K 3 [Fe(CN) 6 ], [ 24,28–30 ] which endowed the preparation of CoFe PBA@CoP/NF architectures with CoFe PBA nanocubes depositing on metal phosphide nanosheets.…”

Section: Resultsmentioning

confidence: 99%

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Zhao

et al. 2021

Small Methods

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At present, to boost the sluggish kinetic of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), precious Pt and Ir/Ru-based electrocatalysts are usually employed and acknowledged as benchmark in practical application. [3,4] However, their high cost has been considered as an insurmountable barrier. [5] Therefore, numerous efforts have been undertaken to exploit alternative electrocatalysts with cost-effective and high efficiency. [6][7][8] Moreover, bifunctional electrocatalysts are especially important from the technological point of view owing to their facility for cell assembly and reduced manufacture cost accordingly. [9] Among the booming earth-abundant alternatives, including transition metalbased oxide, [10] nitrides, [11] phosphides, [12] and selenides, [13] transition metal phosphides (TMPs) have sparked considerable attention due to their metalloid characteristics and superior electrical conductivity, thus demonstrated as promising bifunctional electrocatalysts. [14] Various approaches have been proposed to enhance the electrocatalytic performance of TMPs from the aspects of incorporation of foreign metal sites or surface coating, for example the preparation of bimetallic phosphide, [15] Cu 3 P coated by a N,Pcodoped carbon shell, [16] and CoP/TiO x heterostructure, [17] etc. Moreover, rational design of a catalyst with favorable electronic and geometric structure is also of prerequisite towards the rapid electron transfer and mass transport. [18] From this perspective, 2D TMPs nanosheets can serve as one of the most prospective candidates owing to their high surface area-to-volume ratio, highly exposed active sites, large contact area with electrolyte. Benefitted from the reduced thickness of TMPs nanosheets, the low-coordinated sites on the catalysts' surface including steps, edges, and kinks will be favorable for electrocatalytic process. [19,20] Nevertheless, due to the shrinkage and fusion caused by stress and decomposition, nanosheets are prone to collapse and thus the impaired electrocatalytic activities limit their application. In this regard, rational design of hierarchical heterostructures based on 2D TMPs nanosheets is highly desirable.Prussian blue (PB) and PB analogues (PBA) formed by coordination interaction between cyanide ligands and metal ions Efficient and durable electrocatalysts are highly desirable for overall water splitting. Herein, a facile strategy is demonstrated to rationally construct CoFe Prussian blue analogues (PBA)@CoP cube-on-sheet hierarchical structure by etching reaction with intermediated CoO to form PBA nanocubes. Benefitting from the heterostructured engineering, the as-synthesized CoFe PBA@CoP presents remarkable electrocatalytic performance in 1.0 m KOH, only requiring overpotentials of 100 mV for hydrogen evolution reaction (HER) and 171 mV for oxygen evolution reaction (OER) to reach the 10 mA cm −2 current density with good stability. Extraordinarily enhanced electrocatalytic performance is ascribed to not only the rapid charge transfer ...

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Section: Resultsmentioning

confidence: 99%

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Zhao

et al. 2021

Small Methods

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“…In analysis using this metric, the lower R ct value observed for Ni 0.85 Se@NC indicates a lower proton transfer resistance and faster electron transfer ability compared to the other two samples (Figure S15, Supporting Information). [ 45,46 ] Based on the aforementioned metrics, the HER performance of the Ni x Se y @NC nanohybrids measured in 0.5 m H 2 SO 4 surpasses most high‐performance transition metal‐based catalysts (Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Accurately Regulating the Electronic Structure of Ni_xSe_y@NC Core–Shell Nanohybrids through Controllable Selenization of a Ni‐MOF for pH‐Universal Hydrogen Evolution Reaction

Huang

et al. 2020

Small

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N‐doped carbon‐encapsulated transition metal selenides (TMSs) have garnered increasing attention as promising electrocatalysts for hydrogen evolution reaction (HER). Accurately regulating the electronic structure of these nanohybrids to reveal the underlying mechanism for enhanced HER performances is still challenging and thus requires deep excavation. Herein, a series of pomegranate‐like NixSey@NC core–shell nanohybrids (including Ni0.85Se @ NC, NiSe2@NC, and NiSe@NC) through controllable selenization of a Ni‐MOF precursor is reported. The component of the nanohybrids can be fine‐tuned by tailoring the selenization temperature and feed ratio, through which the electronic structure can be synchronously regulated. Among these nanohybrids, the Ni0.85Se @ NC exhibits the optimum pH‐universal HER performance with overpotentials of 131, 135, and 183 mV in 0.5 m H2SO4, 1.0 m KOH, and 1.0 m PBS, respectively, at 10 mA cm−2, which are attributed to the increased partial density of state at the Fermi level and effective van der Waals interactions between Ni0.85Se and NC matrix explained by density functional theory calculations.

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“…The superior electroactivity of nanoporous CuAlNiMoFe is also reflected by the lowest Tafel slope of ≈50 mV dec −1 , compared with those of nanoporous CuAlNiMo (≈58 mV dec −1 ), CuAlNi (≈148 mV dec −1 ), and Pt/C (≈60 mV dec −1 ) (Figure 6c). To the best of our knowledge, the Tafel slope and overpotential at 10 mA cm −2 of the nanoporous CuAlNiMoFe are lowest in the values reported for non‐noble HER catalysts operating in neutral media (Table S3, Supporting Information), such as CrO x /Cu–Ni (48 mV and 64 mV dec −1 ), [ 7 ] RhP x (38 mV and 56 mV dec −1 ), [ 58 ] MoP (84 mV and 63 mV dec −1 ). [ 59 ] Moreover, galvanostatic and potential cycling measurements demonstrate the superior electrochemical durability of nanoporous CuAlNiMoFe hybrid electrode in the 1 m PBS solution.…”

Section: Resultsmentioning

confidence: 86%

Nanoporous Surface High‐Entropy Alloys as Highly Efficient Multisite Electrocatalysts for Nonacidic Hydrogen Evolution Reaction

Yao

Zhou

Shi

et al. 2020

Adv Funct Materials

214

106

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Electrocatalytic hydrogen evolution in alkaline and neutral media offers the possibility of adopting platinum‐free electrocatalysts for large‐scale electrochemical production of pure hydrogen fuel, but most state‐of‐the‐art electrocatalytic materials based on nonprecious transition metals operate at high overpotentials. Here, a monolithic nanoporous multielemental CuAlNiMoFe electrode with electroactive high‐entropy CuNiMoFe surface is reported to hold great promise as cost‐effective electrocatalyst for hydrogen evolution reaction (HER) in alkaline and neutral media. By virtue of a surface high‐entropy alloy composed of dissimilar Cu, Ni, Mo, and Fe metals offering bifunctional electrocatalytic sites with enhanced kinetics for water dissociation and adsorption/desorption of reactive hydrogen intermediates, and hierarchical nanoporous Cu scaffold facilitating electron transfer/mass transport, the nanoporous CuAlNiMoFe electrode exhibits superior nonacidic HER electrocatalysis. It only takes overpotentials as low as ≈240 and ≈183 mV to reach current densities of ≈1840 and ≈100 mA cm−2 in 1 m KOH and pH 7 buffer electrolytes, respectively; ≈46‐ and ≈14‐fold higher than those of ternary CuAlNi electrode with bimetallic Cu–Ni surface alloy. The outstanding electrocatalytic properties make nonprecious multielemental alloys attractive candidates as high‐performance nonacidic HER electrocatalytic electrodes in water electrolysis.

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Hydrogen Evolution: Embedding RhP_x in N, P Co‐Doped Carbon Nanoshells Through Synergetic Phosphorization and Pyrolysis for Efficient Hydrogen Evolution (Adv. Funct. Mater. 33/2019)

Abstract: In article number 1901790, Bin Dong, Yadong Yin, and co‐workers describe a unique pyrolysis strategy for the synthesis of uniform RhPx nanoparticles dispersed in carbon nanoshells, which can serve as efficient and stable electrocatalysts for splitting water and producing hydrogen.

Cited by 13 publications

References 0 publications

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Accurately Regulating the Electronic Structure of Ni_xSe_y@NC Core–Shell Nanohybrids through Controllable Selenization of a Ni‐MOF for pH‐Universal Hydrogen Evolution Reaction

Nanoporous Surface High‐Entropy Alloys as Highly Efficient Multisite Electrocatalysts for Nonacidic Hydrogen Evolution Reaction

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Hydrogen Evolution: Embedding RhPx in N, P Co‐Doped Carbon Nanoshells Through Synergetic Phosphorization and Pyrolysis for Efficient Hydrogen Evolution (Adv. Funct. Mater. 33/2019)

Abstract: In article number 1901790, Bin Dong, Yadong Yin, and co‐workers describe a unique pyrolysis strategy for the synthesis of uniform RhPx nanoparticles dispersed in carbon nanoshells, which can serve as efficient and stable electrocatalysts for splitting water and producing hydrogen.

Cited by 13 publications

References 0 publications

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Hierarchically Assembling CoFe Prussian Blue Analogue Nanocubes on CoP Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Accurately Regulating the Electronic Structure of NixSey@NC Core–Shell Nanohybrids through Controllable Selenization of a Ni‐MOF for pH‐Universal Hydrogen Evolution Reaction

Nanoporous Surface High‐Entropy Alloys as Highly Efficient Multisite Electrocatalysts for Nonacidic Hydrogen Evolution Reaction

Contact Info

Product

Resources

About

Hydrogen Evolution: Embedding RhP_x in N, P Co‐Doped Carbon Nanoshells Through Synergetic Phosphorization and Pyrolysis for Efficient Hydrogen Evolution (Adv. Funct. Mater. 33/2019)

Accurately Regulating the Electronic Structure of Ni_xSe_y@NC Core–Shell Nanohybrids through Controllable Selenization of a Ni‐MOF for pH‐Universal Hydrogen Evolution Reaction