Journal ArticleDOI
Earth-Abundant Iron Diboride (FeB2) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting
Hui Li,Peng Wen,Qi Li,Chaochao Dun,Junheng Xing,Chang Lu,Shiba P. Adhikari,Lin Jiang,David L. Carroll,Scott M. Geyer +9 more
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TLDR
In this article, the authors reported that FeB2 nanoparticles, prepared by a facile chemical reduction of Fe2+ using LiBH4 in an organic solvent, are a superb bifunctional electrocatalyst for overall water splitting.Abstract:
Developing efficient, durable, and earth-abundant electrocatalysts for both hydrogen and oxygen evolution reactions is important for realizing large-scale water splitting. The authors report that FeB2 nanoparticles, prepared by a facile chemical reduction of Fe2+ using LiBH4 in an organic solvent, are a superb bifunctional electrocatalyst for overall water splitting. The FeB2 electrode delivers a current density of 10 mA cm−2 at overpotentials of 61 mV for hydrogen evolution reaction (HER) and 296 mV for oxygen evolution reaction (OER) in alkaline electrolyte with Tafel slopes of 87.5 and 52.4 mV dec−1, respectively. The electrode can sustain the HER at an overpotential of 100 mV for 24 h and OER for 1000 cyclic voltammetry cycles with negligible degradation. Density function theory calculations demonstrate that the boron-rich surface possesses appropriate binding energy for chemisorption and desorption of hydrogen-containing intermediates, thus favoring the HER process. The excellent OER activity of FeB2 is ascribed to the formation of a FeOOH/FeB2 heterojunction during water oxidation. An alkaline electrolyzer is constructed using two identical FeB2-NF electrodes as both anode and cathode, which can achieve a current density of 10 mA cm−2 at 1.57 V for overall water splitting with a faradaic efficiency of nearly 100%, rivalling the integrated state-of-the-art Pt/C and RuO2/C.read more
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Three-dimensional porous nanoarchitecture constructed by ultrathin NiCoBOx nanosheets as a highly efficient and durable electrocatalyst for oxygen evolution reaction
TL;DR: In this paper, a 3D porous nano-architecture of borate anchored ultrathin cobalt-nickel-boron oxide (NiCoBOx) nanosheets is synthesized by a facile borohydride/amine hydrolysis strategy.
Journal ArticleDOI
Tuning Surface Electronic Structure of Two‐Dimensional Cobalt‐Based Hydroxide Nanosheets for Highly Efficient Water Oxidation
Chen Qiao,Souleymen Rafai,Tai Cao,Zhitao Wang,Haoyu Wang,Youqi Zhu,Xilan Ma,Pengcheng Xu,Chuanbao Cao +8 more
TL;DR: In this article, an in-situ surface modification strategy for α and β Co(OH)2 nanosheets was proposed to boost their OER activities via a simple substitution of their surface hydroxyl functional groups by carboxylate or acetic anhydridate ones, respectively.
Journal ArticleDOI
Effect of phosphate variation on morphology and electrocatalytic activity (OER) of hydrous nickel pyrophosphate thin films
Supriya J. Marje,Pranav K. Katkar,S.B. Kale,Abhishek C. Lokhande,C.D. Lokhande,Umakant M. Patil +5 more
TL;DR: In this paper, the effect of phosphate variation was studied via preparing thin films with different nickel and phosphate molar weight ratio, as decreasing phosphate concentration in the reaction bath willow leaf like morphology changes to compact microflower with rectangular petals.
Journal ArticleDOI
Hierarchical Hollow Nanocages Derived from Polymer/CobaltComplexes for Electrochemical Overall Water Splitting
Yixin Chen,Mingyue Wang,Siyuan Xiang,Jingwei Liu,Siyang Feng,Congcong Wang,Nan Zhang,Tanglue Feng,Mingxi Yang,Kai Zhang,Bai Yang +10 more
TL;DR: In this paper, a hierarchical hollow nanocomposite that is made of CoP hollow nanoparticles (NPs) and hollow N-doped carbon nanocages (CoP@NCHNCs) derived from polydopamine (PDA)/cobalt nanocontainers through a pyrolysis-phosphidation method was designed.
Journal ArticleDOI
Efficient electrocatalytic water splitting by bimetallic cobalt iron boride nanoparticles with controlled electronic structure.
Chenchen Qiang,Liang Zhang,Hengli He,Yangyang Liu,Yueying Zhao,Tian Sheng,Shoujie Liu,Xi-Lin Wu,Zhen Fang +8 more
TL;DR: In this article, a new Co-Fe-B ternary catalyst with improved crystallinity is successfully synthesized by combining the chemical reduction and subsequent solid-state reaction method.
References
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Journal ArticleDOI
Solar Water Splitting Cells
Michael G. Walter,Emily L. Warren,James R. McKone,Shannon W. Boettcher,Qixi Mi,Elizabeth A. Santori,Nathan S. Lewis +6 more
TL;DR: The biggest challenge is whether or not the goals need to be met to fully utilize solar energy for the global energy demand can be met in a costeffective way on the terawatt scale.
Journal ArticleDOI
Noble metal-free hydrogen evolution catalysts for water splitting
Xiaoxin Zou,Yu Zhang +1 more
TL;DR: This review highlights the recent research efforts toward the synthesis of noble metal-free electrocatalysts, especially at the nanoscale, and their catalytic properties for the hydrogen evolution reaction (HER), and summarizes some important examples showing that non-Pt HER electrocatsalysts could serve as efficient cocatalysts for promoting direct solar-to-hydrogen conversion in both photochemical and photoelectrochemical water splitting systems, when combined with suitable semiconductor photocatalyst.
Journal ArticleDOI
Design of electrocatalysts for oxygen- and hydrogen-involving energy conversion reactions
TL;DR: The emphasis of this review is on the origin of the electrocatalytic activity of nanostructured catalysts toward a series of key clean energy conversion reactions by correlating the apparent electrode performance with their intrinsic electrochemical properties.
Journal ArticleDOI
In Situ Formation of an Oxygen-Evolving Catalyst in Neutral Water Containing Phosphate and Co2+
TL;DR: A catalyst that forms upon the oxidative polarization of an inert indium tin oxide electrode in phosphate-buffered water containing cobalt (II) ions is reported that not only forms in situ from earth-abundant materials but also operates in neutral water under ambient conditions.
Journal ArticleDOI
Solar Energy Supply and Storage for the Legacy and Nonlegacy Worlds
Timothy R. Cook,Dilek K. Dogutan,Steven Y. Reece,Yogesh Surendranath,Thomas S. Teets,Daniel G. Nocera +5 more
TL;DR: The Scope of Review: Large-Scale Centralized Energy Storage, Chemical Energy Storage: Solar Fuels, and Capacitors 6486 5.1.2.