scholarly journals Highly Electroactive Ni Pyrophosphate/Pt Catalyst toward Hydrogen Evolution Reaction

2019 ◽  
Vol 11 (5) ◽  
pp. 4969-4982 ◽  
Author(s):  
Jayaraman Theerthagiri ◽  
Eduardo S. F. Cardoso ◽  
Guilherme V. Fortunato ◽  
Gleison A. Casagrande ◽  
Baskar Senthilkumar ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Pt Catalyst

Charge pumping enabling Co-NC to outperform benchmark Pt catalyst for pH-universal hydrogen evolution reaction

2021 ◽  
Author(s):  
Ziliang Chen ◽  
Huilin Qing ◽  
Ruirui Wang ◽  
Renbing Wu
Keyword(s):  
Transition Metals ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Pt Catalyst ◽  
Charge Pumping ◽  
Comparable Activity

Transition metals (TM) coupled with N-doped carbon (NC) nanocomposite has been regarded as an alternative electrocatalyst showing Pt-comparable activity towards hydrogen evolution reaction (HER), but to date none have outperformed...

scholarly journals Atomic Pt-Clusters Decoration Triggers a High-Rate Performance on Ni@Pd Bimetallic Nanocatalyst for Hydrogen Evolution Reaction in Both Alkaline and Acidic Medium

2020 ◽  
Vol 10 (15) ◽  
pp. 5155 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Sheng-Po Wang ◽  
Shuan Lin ◽  
Che Yan ◽  
Kuan-Wen Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Current Density ◽  
Acidic Medium ◽  
Lattice Mismatch ◽  
Cathodic Current Density ◽  
Green Energy ◽  
High Rate ◽  
Pt Catalyst ◽  
Cathodic Current

The development of inexpensive and highly robust nanocatalysts (NCs) to boost electrochemical hydrogen evolution reaction (HER) strengthens the implementation of several emerging sustainable-energy technologies. Herein, we proposed a novel nano-architecture consisting of a hierarchical structured Ni@Pd nanocatalyst with Pt-clusters decoration on the surface (denoted by Ni@Pd-Pt) for HER application in acidic (0.5 M H2SO4) and alkaline (0.1 M KOH) mediums. The Ni@Pd-Pt NC is fabricated on a carbon black support via a “self-aligned” heterogeneous nucleation-crystal growth mechanism with 2 wt.% Pt-content. As-prepared Ni@Pd-Pt NC outperforms the standard Pt/C (30 wt.% Pt) catalyst in HER and delivers high-rate catalytic performance with an ultra-low overpotential (11.5 mV) at the cathodic current density of 10 mA∙cm−2 in alkaline medium, which is 161.5 mV and 14.5 mV less compared to Ni@Pd (173 mV) and standard Pt/C (26 mV) catalysts, respectively. Moreover, Ni@Pd-Pt NC achieves an exactly similar Tafel slope (42 mV∙dec−1) to standard Pt/C, which is 114 mV∙dec−1 lesser when compared to Ni@Pd NC. Besides, Ni@Pd-Pt NC exhibits an overpotential value of 37 mV at the current density of 10 mA cm−2 in acidic medium, which is competitive to standard Pt/C catalyst. By utilizing physical characterizations and electrochemical analysis, we demonstrated that such an aggressive HER activity is dominated by the increased selectivity during HER due to the reduced competition between intermediate products on the non-homogeneous NC surface. This phenomenon can be rationalized by electron localization owing to the electronegative difference (χPt > χPd > χNi) and strong lattice mismatch at the Ni@Pd heterogeneous binary interfaces. We believe that the obtained results will significantly provide a facile design strategy to develop next-generation heterogenous NCs for HER and related green-energy applications

An Atomically Dispersed Pt Catalyst Anchored on an Fe/N/C Support for Enhanced Hydrogen Evolution Reaction

2020 ◽  
Vol 124 (22) ◽  
pp. 11760-11766
Author(s):  
Haoyang Li ◽  
Guoliang Wang ◽  
Fengru Zhang ◽  
Liangliang Zou ◽  
Zhiqing Zou ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Pt Catalyst

Single-atom catalysts based on TiN for the electrocatalytic hydrogen evolution reaction: a theoretical study

2021 ◽  
Author(s):  
Bingling He ◽  
Jiansheng Shen ◽  
Bin Wang ◽  
Zhansheng Lu ◽  
Dongwei Ma
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Theoretical Study ◽  
Sustainable Production ◽  
Single Atom ◽  
Pt Catalyst ◽  
Hydrogen Fuel

Electrocatalytic hydrogen evolution reaction (HER) for the water splitting is crucial for the sustainable production of clean hydrogen fuel, while the expensiveness of Pt catalyst impedes its commercialization. Herein, we...

Mn-doped NiCoP flower-like structure as a highly efficient electrocatalyst for hydrogen evolution reaction in acidic and alkaline solutions with long duration

Nanoscale ◽  
2021 ◽  
Author(s):  
Xin Yu ◽  
Siran Xu ◽  
Zhe Wang ◽  
Xiaohong Cheng ◽  
Yeshuang Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Noble Metal ◽  
Hydrogen Evolution Reaction ◽  
Pt Catalyst ◽  
Alkaline Solutions ◽  
Highly Efficient ◽  
Long Duration ◽  
Mn Doped

The exploration of efficient non-noble metal electrocatalysts for hydrogen evolution reaction has received much attention to replace commercial Pt catalyst. It is all known that cooperative coupling of appropriate non-noble...

Core–shell, hollow-structured iridium–nickel nitride nanoparticles for the hydrogen evolution reaction

2014 ◽  
Vol 2 (3) ◽  
pp. 591-594 ◽  
Author(s):  
Kurian A. Kuttiyiel ◽  
Kotaro Sasaki ◽  
Wei-Fu Chen ◽  
Dong Su ◽  
Radoslav R. Adzic
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Pt Catalyst ◽  
Core Shell ◽  
Nickel Nitride

A core–shell structured Ni nitride capped by an Ir shell enhances the HER activity compared to a Pt catalyst.

A crystalline–amorphous Ni–Ni(OH)2 core–shell catalyst for the alkaline hydrogen evolution reaction

2020 ◽  
Vol 8 (44) ◽  
pp. 23323-23329
Author(s):  
Jing Hu ◽  
Siwei Li ◽  
Yuzhi Li ◽  
Jing Wang ◽  
Yunchen Du ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Core Shell ◽  
Alkaline Conditions

Crystalline–amorphous Ni–Ni(OH)2 core–shell assembled nanosheets exhibit outstanding electrocatalytic activity and stability for hydrogen evolution under alkaline conditions.

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

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