Ni-Co-B nanosheets coupled with reduced graphene oxide towards enhanced electrochemical oxygen evolution

Sun, Jikang; Zhang, Wen; Wang, Shiying; Ren, Yibin; Liu, Qingyun; Sun, Yanfang; Tang, Lin; Guo, Jinxue; Zhang, Xiao

doi:10.1016/j.jallcom.2018.10.296

Cited by 40 publications

(32 citation statements)

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“…The group of Zhang et al also synthesized Co–Ni–B and found that the molar ratio of Ni/(Ni + Co) = 10% yields the best performance for OER in 1 m KOH. Co–Ni–B supported on Ni foam, carbon cloth and rGO were reported by different groups in a bid to lower down the overpotential. For HER, Co–Ni–B/CC shows a lower overpotential of η 10 = 80 mV ( Figure a), which was also attributed to the formation of very small‐sized particles with average diameter of 5–10 nm (Figure b).…”

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

337

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: 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

337

243

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“…Similar method was used to prepare NiCoBx nanosheets. [11][12] The crystallinity of NBC sample is also poor [Figure S2(a)]. Minor amount of Ni nanocrystals [JCPDS 65-2865] are also observed [Figure S1(c-f)] which was also reported.…”

mentioning

confidence: 61%

Boron leaching: Creating vacancy-rich Ni for enhanced hydrogen evolution

Han

Wang

et al. 2021

Nano Res.

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Creating vacancy is often highly effective in enhancing the hydrogen evolution performance of transition metal-based catalysts. Vacancy-rich Ni nanosheets has been fabricated via topochemical formation of 2D Ni2B on graphene precursor followed by boron leaching.Anchored on graphene, a few atomic layered Ni2B nanosheets are first obtained by reduction and annealing. Large number of atomic vacancies are then generated in the Ni2B layer via leaching boron atoms. When used for hydrogen evolution reaction (HER), the vacancy-rich Ni/Ni(OH)2 heterostructure nanosheets demonstrate remarkable performance with a low overpotential of 159 mV at a current density of 10 mA•cm -2 in alkaline solution, a dramatic improvement over 262 mV of its precursor. This enhancement is associated with the formation of vacancies which introduce more active sites for HER along Ni/Ni(OH)2 heterointerfaces. This work offers a facile and universal route to introduce vacancies and improve catalytic activity. TOC GRAPHICSHydrogen is a promising energy carrier since it has high energy density, is naturally abundant, and produces no pollutants when consumed. 1-2 Hydrogen evolution reaction (HER) via water electrolysis has long been considered as the most sustainable way to produce hydrogen; but the

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“…15). 88 The XRD pattern showed a broad peak at 26°, corresponding to rGO, and characteristic peaks of orthorhombic Ni 3 B and Co 4 B. The Raman spectrum exhibited a D band, corresponding to disordered carbon, and G band, corresponding to sp 2 carbon.…”

Section: Doping-induced Modified Graphene Compositesmentioning

confidence: 95%