A PHP Error was encountered

Severity: Warning

Message: file_get_contents(https://...@pubfacts.com&api_key=b8daa3ad693db53b1410957c26c9a51b4908&a=1): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests

Filename: helpers/my_audit_helper.php

Line Number: 176

Backtrace:

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 176
Function: file_get_contents

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 250
Function: simplexml_load_file_from_url

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3122
Function: getPubMedXML

File: /var/www/html/application/controllers/Detail.php
Line: 575
Function: pubMedSearch_Global

File: /var/www/html/application/controllers/Detail.php
Line: 489
Function: pubMedGetRelatedKeyword

File: /var/www/html/index.php
Line: 316
Function: require_once

Silver Vanadium Diphosphate AgVPO: Electrochemistry and Characterization of Reduced Material providing Mechanistic Insights. | LitMetric

Silver vanadium phosphorous oxides (AgVPO) are notable battery cathode materials due to their high energy density and demonstrated ability to form in-situ Ag metal nanostructured electrically conductive networks within the cathode. While analogous silver vanadium diphosphate materials have been prepared, electrochemical evaluations of these diphosphate based materials have been limited. We report here the first electrochemical study of a silver vanadium diphosphate, AgVPO, where the structural differences associated with phosphorous oxides versus diphosphates profoundly affect the associated electrochemistry. Reminiscent of AgVOPO reduction, formation of silver metal nanoparticles was observed with reduction of AgVPO. However, counter to AgVOPO reduction, AgVPO demonstrates a significant decrease in conductivity upon continued electrochemical reduction. Structural analysis contrasting the crystallography of the parent AgVPO with that of the proposed LiVPO reduction product is employed to gain insight into the observed electrochemical reduction behavior, where the structural rigidity associated with the diphosphate anion may be associated with the observed particle fracturing upon deep electrochemical reduction. Further, the diphosphate anion structure may be associated with the high thermal stability of the partially reduced AgVPO materials, which bodes well for enhanced safety of batteries incorporating this material.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4389692PMC
http://dx.doi.org/10.1016/j.jssc.2013.01.020DOI Listing

Publication Analysis

Top Keywords

silver vanadium
16
vanadium diphosphate
12
electrochemical reduction
12
diphosphate agvpo
8
phosphorous oxides
8
agvopo reduction
8
reduction agvpo
8
diphosphate anion
8
agvpo
7
reduction
7

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!