Electroless Plating of Highly Efficient Bifunctional Boride‐Based Electrodes toward Practical Overall Water Splitting

Hao, Weiju; Wu, Renbing; Zhang, Ruiqi; Ha, Yuan; Chen, Ziliang; Wang, Lincai; Yang, Yanjing; Ma, Xiaohua; Sun, Dalin; Fang, Fang; Guo, Yanhui

doi:10.1002/aenm.201801372

Cited by 135 publications

(100 citation statements)

References 45 publications

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“…Recently, Mullins and co‐workers presented an excellent analysis of the degree of oxidation in metal chalcogenides, pnictides, and carbides during OER and summarized the various theories for their electrochemical activity. In case of metal borides as well, OER proceeds in a similar fashion by forming surface oxide/hydroxide species . Operando X‐ray absorption spectroscopy (XAS) studies on Ni x B showed that during OER, Ni–B core remains intact while the surface oxidation state changes from Ni 2+ to Ni 3+ ( Figure a,b), thus giving direct evidence of the formation of surface NiOOH layer.…”

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 96%

“…However, it must be noted that a catalyst loading of 12.3 mg cm −2 was used in this work, which is very high and hence cannot be justly compared to the standard reports. Similarly, Co–B was also deposited on Ni foam and Ni foil wherein formation of curved nanosheets with a thickness of a few nanometers was observed on surface of Co–B/Ni foam, while Co–B/Ni foil displayed a porous nodule‐like structure with large number of internal spaces. When tested in 1 m KOH, Co–B/Ni foam showed η 10 = 110 and 315 mV, for HER and OER, respectively.…”

Section: Strategies Adopted To Enhance the Performance Of Metal Boridesmentioning

confidence: 99%

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Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

315

243

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Electrocatalytic water-splitting has gained a firm hold in the area of renewable hydrogen production owing to its integrative compatibility with intermittent energy sources. However, wide-scale implementation of this technology demands discovery of new electrode materials that strike a good balance between efficiency, stability, and cost. In the pool of inexpensive electrodes capable of catalyzing hydrogen and oxygen evolution reactions, metal borides/ borates have made a big splash in the last decade. However, the research in this family of electrocatalysts remains unorganized owing to the diversity of reports. This review summarizes the past and present research progress in metal borides/borates for electrocatalytic water-splitting. The fundamental reasons for electrochemical behavior in different metal borides/borates are highlighted here, also including some comments regarding erroneous practices in the performance evaluation of metal borides/borates. Various strategies used to enhance the electrocatalytic performance of metal borides/borates are discussed in detail. Different methods evolved over the years for the synthesis of metal borides/ borates are also discussed. Finally, an assessment of the commercial viability of metal borides/borates is made and future research directions are suggested. multimetal oxides, [18,19] layered double hydroxides, [20] oxyhydroxides, [21] and perovskites. [13,18] In addition to these, there has been the family of transition-metal borides/borates that have garnered enormous interest in the recent past. Though transition-metal borides (TMBs) have been used for water electrolysis since many decades, they were not really seen as potential candidates to replace noble metal catalysts, until recently. Indeed, in 2009, the group of Daniel Nocera reported in situ formed Co [22] and Ni [23] borates as analogous catalysts to Co phosphate, [24] for near-neutral water-splitting. Later, the groups of Hu [25] and Patel [26] reported development of Mo boride and Co boride, respectively, for electrocatalytic water splitting. Following these reports, transition-metal borides/ borates [27][28][29][30][31][32] were developed using various techniques and were used extensively for water-splitting reactions, in different pH solutions. Here, we would like to inform the readers that usually boron-based catalysts that are developed in situ using electrodeposition are referred to as "borates" (denoted as M-B i , M = metal) while those catalysts prepared by any other technique are referred to as "borides" (denoted as M-B). Over the past 5-6 years, a lot of studies have been carried out on borides/borates with remarkable results, presenting new possibilities in search for non-noble electrocatalysts. The electrochemical performance, stability and other important properties of all the metal borides reported so far are enlisted in Table 1 while that of metal borates are listed in Table 2. However, there are a lot of aspects that are not yet understood completely about borides/borates. For instance, the o...

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Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 96%

Section: Strategies Adopted To Enhance the Performance Of Metal Boridesmentioning

confidence: 99%

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

315

243

View full text Add to dashboard Cite

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“…[1][2][3][4][5] So far, Pt is regarded as the most effective catalyst for hydrogen evolution reaction (HER) in acidic media, because of its appropriate adsorption of H atoms. [1][2][3][4][5] So far, Pt is regarded as the most effective catalyst for hydrogen evolution reaction (HER) in acidic media, because of its appropriate adsorption of H atoms.…”

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confidence: 99%

Ruthenium‐Based Single‐Atom Alloy with High Electrocatalytic Activity for Hydrogen Evolution

Chen

et al. 2019

Advanced Energy Materials

296

217

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performance and low price for working in alkaline solution.Ruthenium, as a member of platinumgroup metals with 1/30 price of Pt, [14] has been proved to be a promising catalyst for HER in alkaline solution due to its high efficiency on water dissociation, [15][16][17][18] however, the strong interaction between Ru and H atoms impedes the subsequent hydrogen evolution because of the well-known scaling relationship for heterogeneous catalysts. [17,[19][20][21] Many efforts had been devoted to constructing Rubased heterostructures (e.g., Ru/carbon quantum dots, [22] Ru/C 2 N, [18] RuCo/ nitrogen-doped graphene, [23] fcc-Ru/ C 3 N 4 /C, [17] Ru/nitrogen-doped carbon, [24] Ru/graphene [25] ), which show great advantages on promoting water dissociation by synergistic effect. Nevertheless, less attention was paid on the improvement of hydrogen adsorption. Recently, singleatom alloys (SAAs), which comprise separated solute atoms in metallic matrix, show great potential on circumventing scaling relationships. [23,26,27] meanwhile, the interaction between the solute atoms and matrix can modify their electronic structure, [26,28,29] leading to a suitable adsorption energy for hydrogen. Consequently, constructing Ru-based SAAs opens a new avenue toward high HER performance.Herein, we reported the synthesis of RuAu SAAs through a laser ablation in liquid (LAL) technique, which possesses strong quenching effect so as to fabricate metastable nanostructures with novel properties. [30,31] We choose Au as the alloying element on the basis of the following considerations: First, Au is known as an inert metal with weak hydrogen adsorption thus can counteract the strong hydrogen adsorption of Ru matrix. Second, the immiscibility between Au and Ru may create a unique geometric and electronic structure in RuAu SAAs. [32,33] Finally, chemically inert Au favors long-term durability during the reaction. As such, the as-prepared RuAu catalyst exhibits a low overpotential, 24 mV@10 mA cm −2 , which is much lower than Pt/C (46 mV@10 mA cm −2 ) in alkaline media. Moreover, the turnover frequency (TOF) of RuAu SAAs is three times that of the Pt/C catalyst. Density functional theory (DFT) computation reveals that the high performance originates from the relay catalysis of Ru host (for water dissociation) and Au dopant (for hydrogen evolution). To the best of our knowledge, this is the first report on the synthesis of RuAu SAAs with outstanding HER performance in alkaline media. Furthermore, the idea of the mixing immiscible metallic elements by LAL can be facilely Highly efficient and stable catalysts for the hydrogen evolution reaction, especially in alkaline conditions are crucial for the practical demands of electrochemical water splitting. Here, the synthesis of a novel RuAu single-atom alloy (SAA) by laser ablation in liquid is reported. The SAA exhibits a high stability and a low overpotential, 24 mV@10 mA cm −2 , which is much lower than that of a Pt/C catalyst (46 mV) in alkaline media. Moreover, the turnover frequency of RuAu SAA is th...

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“…A constant current of 10 mA cm −2 can be well maintained for 15 h, with bubbles continuously evolved and released from the surfaces of both electrodes (Figure b). The performance of Ni−B−O@Ni 3 B is superior to the Pt−C and IrO 2 couple for overall water splitting ,. This makes the Ni−B−O@Ni 3 B one of the best reported bifunctional catalysts among the transition metal borides ,.…”

Section: Resultsmentioning

confidence: 98%

“…The performance of Ni−B−O@Ni 3 B is superior to the Pt−C and IrO 2 couple for overall water splitting ,. This makes the Ni−B−O@Ni 3 B one of the best reported bifunctional catalysts among the transition metal borides ,. Thus, surface oxidization strategy may be used on the development of practical bifunctional metal boride electrodes for overall water splitting.…”

Section: Resultsmentioning

confidence: 99%

Performance of Surface‐Oxidized Ni₃B, Ni₂B, and NiB₂ Electrocatalysts for Overall Water Splitting

et al. 2018

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The development of efficient and earth-abundant bifunctional electrocatalysts is of great important for energy conversion and storage technologies. Three surface oxidized nickel borides of NiÀ BÀ O@Ni 3 B, NiÀ BÀ O@Ni 2 B and NiÀ BÀ O@NiB 2 electrocatalysts have been prepared and investigated. Surface oxidation, which is inevitable for the bifunctional nickel borides, promotes the activity for the oxygen evolution reaction (OER), but leads to activity degradation for the hydrogen evolution reaction (HER).Meanwhile, boron is found to play a crucial role in the oxidation of nickel, facilitating the formation of an active intermediate for the OER. NiÀ BÀ O@Ni 3 B turns out to be the best bifunctional electrocatalyst. An alkaline electrolyzer constructed using NiÀ BÀ O@Ni 3 B electrodes as both anode and cathode has achieved a current density of 10 mA cm À 2 at 1.58 V for overall water splitting with satisfied durability, rivaling the integrated noble metal electrode.

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Electroless Plating of Highly Efficient Bifunctional Boride‐Based Electrodes toward Practical Overall Water Splitting

Cited by 135 publications

References 45 publications

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Ruthenium‐Based Single‐Atom Alloy with High Electrocatalytic Activity for Hydrogen Evolution

Performance of Surface‐Oxidized Ni₃B, Ni₂B, and NiB₂ Electrocatalysts for Overall Water Splitting

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Electroless Plating of Highly Efficient Bifunctional Boride‐Based Electrodes toward Practical Overall Water Splitting

Cited by 135 publications

References 45 publications

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Ruthenium‐Based Single‐Atom Alloy with High Electrocatalytic Activity for Hydrogen Evolution

Performance of Surface‐Oxidized Ni3B, Ni2B, and NiB2 Electrocatalysts for Overall Water Splitting

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Resources

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Performance of Surface‐Oxidized Ni₃B, Ni₂B, and NiB₂ Electrocatalysts for Overall Water Splitting