{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"626723df07007c59f63016909e52f4ca6272fddadde9a92aeeb675d41ba80e50","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"be55bad06625ff8b6d6162f993c5608e9f53b9c1eb26cd44382de17de1bd6b03","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"chem.electrode-interfaces.her-ph-dependence","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"Platinum makes hydrogen from water roughly a hundred times more slowly in basic solution than in acid. The reason for this slowdown is still disputed.","posed_since":"","precise":"Explain the drop of the exchange current density of the hydrogen evolution and oxidation reactions on Pt from pH 0 to pH 13 (about two orders of magnitude), distinguishing between hydrogen binding energy shifts, the interfacial water reorganization and the potential of zero free charge, and cation-hydroxyl interactions. An answer is a model that predicts the measured rate versus pH and versus cation identity.","problem_ref":null,"references":"","settled_by":"pH- and cation-resolved kinetics on single-crystal Pt with in situ spectroscopy, matched by constant-potential simulations of the proton or water discharge step.","status_note":"","title":"Why hydrogen evolution on platinum slows down in alkaline solution","topic_ref":"38ef827c473cdf9120a9ded3eebce465be5b9c1346fcdf8b4d4bf67117c57e38"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b5df6ecc73a1b102f5f6e736b057dca1114e38c0b0fc6a7341fb0f747864d6e7","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"4e3712aca38e99de868e868442be293296ca491ca72fe3332938e8d57f7e1aa7","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"LIRudCRjNBaynRKKrUiggleLus0Kg3pDhuXcjqYtip1fEs1-kuRkaZHBs5UPjZ3OURGlrE03Cv5VO7wpHFdLBw"},"schema":"pubphys.envelope/1"},"record_hash":"b5df6ecc73a1b102f5f6e736b057dca1114e38c0b0fc6a7341fb0f747864d6e7","leaf_index":864}