Nickel-Based Hybrid Material for Electrochemical Oxygen Redox Reactions in an Alkaline Medium

Abstract

Single Crystal X-ray Diffraction Analysis: Table S1: Single Crystal Data and Refinement Results for Ni-BTB-BPE.* Parameters Compound 1 Chemical formula Ni 1.5 C 57 N 6 O 10.5 H 41 Formula weight 1066.02 Crystal system Monoclinic Space Group P2 1 /n a(Å) 8.6003 (2) b(Å) 18.6486 (5) c(Å) 34.7689 (9) α(⁰) 90 β(⁰) 96.7110 (10) γ(⁰) 90 Volume (Å 3) 5538.2 Z 4 Temperature (K) 150 Calculated density (g/cm 3) 1.279 θ range (⁰) 2.359 to 28.324 Absorption coefficient (mm-1) 0.577 Reflections collected 51299 Unique reflections 13628 Goodness-of-fit 0.994 Number of parameters 689 Final R indices [I > 2sigma(I)] R 1 = 0.0695, wR 2 = 0.1872 [a] R1 = F 0 -F c / F 0 ; wR 2 = {[w(F 0 2-F c 2) 2 ]/ [w(F 0 2) 2 ]} 1/2 ; w = 1/[σ 2 (F 0) 2 + (aP) 2 + bP];P = [max(F 0 2 ,0) + 2(F c) 2 ]/3; a = 0.1293 , b = 0.0000 *Recently the structure of this compound was reported by us (CCDC no. 1854511).

Vanadate Encapsulated Polyoxoborate Framework with [V12B18] Clusters: An Efficient Bifunctional Electrocatalyst for Oxygen and Hydrogen Evolution Reactions

“…Nowadays, massive overuse of nonrenewable fossil fuels and drastic increases of the greenhouse effect have impelled researchers to search for alternative renewable and sustainable energy sources . Among many innovative clean energy technologies such as fuel cells, alkaline cells, and metal–air batteries, electrochemical water splitting is a highly accepted and most promising technique for large-scale production of green energy with zero emission of greenhouse gases. , Generally, two fundamental half-reactions, i.e., the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), comprise the water splitting process. − Mostly, transition metal based inorganic materials, e.g., oxides/perovskite, , phosphates, , phosphides, , phosphonates, , nitrides, sulfides, ,, and many plentiful frameworks − and their composite materials ,, have exhibited remarkable catalytic activity toward the OER and HER compared to precious benchmark electrocatalysts . Such energy generation behaviors are still unexplored in the open-framework polyoxoborate family.…”

Charge Separated One-Dimensional Hybrid Cobalt/Nickel Phosphonate Frameworks: A Facile Approach to Design Bifunctional Electrocatalyst for Oxygen Evolution and Hydrogen Evolution Reactions

“…Over the past few decades, the excessive depletion of fossil fuels and severe environmental deterioration have stimulated intense research to develop renewable and sustainable clean energy conversion and storage devices composed of modern technologies such as water splitting, fuel cells, and metal–air batteries. − In these prospective techniques, the electrochemical splitting of water into hydrogen and oxygen offers a promising method for greener energy production with zero emission of greenhouse gases and can effectively fulfill the increasing clean and sustainable energy demand for global energy. − Generally, water splitting occurs in aqueous acidic or alkaline media comprising two half-reactions, viz., the cathodic hydrogen evolution reaction (HER) and the anodic oxygen evolution reaction (OER), both of which are vital to determining the overall efficiency of the water splitting process. − Although many superior state-of-the-art electrocatalysts have been explored to reduce the large overpotential and increase the reaction rate toward OER and HER, low abundance, scarcity, and high cost are major obstacles for their widespread commercial applicability. , …”

Pristine Metal–Organic Frameworks and their Composites for Renewable Hydrogen Energy Applications

“…for the improvement of conductivity and durability of the MOFs for efficient electrocatalytic HER and ORR. [170][171][172] For instance, the combination of 2D conjugated MOF (PcCuO 8 Co) MOFs with CNT can lead to high accessibility of the active CoO 4 sites, high conductivity, and porous structure. The optimal composite exhibited electrocatalytic activities toward ORR (E 1/2 = 0.83 V vs. RHE and j L = 5.3 mA cm −2 ) in alkaline media, which was comparable to the commercial Pt/C (E 1/2 = 0.85 V vs. RHE) [162] (Figure 6c).…”