1,560 papers and 14,992 measured results on hydrogen storage and carrier chemistry — sodium borohydride (NaBH₄) hydrolysis and ammonia (NH₃) decomposition. Ask Claude or ChatGPT, and it answers with the source text quoted.
Nothing to install, no password — just a few clicksh2-benchhttps://h2-mcp.hydrochan.com/mcp
Click Connect on the connector you just added. An authorization window opens — follow it through:
Any Google account works — your work address or a personal Gmail. What matters is the real name: it is the only way to tell who is using the database, and it is recorded alongside your access.
The connection then stays live. It expires roughly once a month; when it does, repeat the same steps once.
Start a new chat, click + at the bottom left of the input box, and check that
h2-bench is switched on under Connectors. Then just ask. The database holds two corpora
(sbh and nh3), so naming the one you mean sharpens the answer. Examples grouped by
what you're trying to do:
"Find conversion results below 500°C for Ru/Al2O3 catalysts in NH3 decomposition"
"Which papers report NaBH₄ regeneration yields? Include DOIs"
"Show top-performing catalysts by hydrogen generation rate in NH3 decomposition, with reaction conditions, as a table"
Precious- and non-precious-metal catalysts use different bases — per gram of catalyst vs. per gram of metal — so you'll get two separate tables. Don't mix numbers across the two bases.
"Find what the paper text says about why NH3 decomposition catalysts lose activity"
This searches beyond the tabulated numbers, into the paper body and Supporting Information.
"Are there conflicting claims about the effect of Ru loading in NH3 decomposition?"
This is a layer mapping support/attack/qualify relations between papers' claims, currently available for the NH3 corpus only.
"What supports are most common in NH3 thermocatalysis papers, and how has that changed by year?"
"How many corpora are in this database, and how many papers in each?"
Every number comes with its source excerpt, page, and DOI. Treat a number without an excerpt as suspect and check the paper.
No sign-in needed to browse these maps in a plain browser — handy for a quick look at the whole landscape without a chat.
One command connects you to the same database — no web setup:
claude mcp add --transport http h2-bench https://h2-mcp.hydrochan.com/mcpThen type /mcp in Claude Code → h2-bench → Authenticate, and the same
Google sign-in → real name → approve flow opens in your browser.
ChatGPT connects to the same server. It takes a little more setup than Claude: you have to turn on developer mode first, and pick the app explicitly in every conversation. Web only, and it requires a Plus, Pro, Business, Enterprise or Edu account.
chatgpt.com/plugins). The button in the next step
only appears once developer mode is on.h2-benchhttps://h2-mcp.hydrochan.com/mcp
h2-bench. The database is not used unless you select it — unlike Claude, it is not on
by default.| What you see | What to do |
|---|---|
| "Access denied" after signing in | Tell the maintainer (Chan Kim) — you have hit the block list. |
| A different sign-in method appears instead of Google | Another account may be signed in to your browser. Try again in a private window. |
| The connector will not add | The free plan allows one custom connector. Remove an existing one first. |
| It worked, then says authentication expired | Expected. Click Connect again and repeat the Google sign-in and name step. |
| Claude does not seem to find the database | Check that h2-bench is switched on under + → Connectors. |
| (ChatGPT) No + button on the plugins page | Developer mode is still off. Turn it on under Settings → Security and login first. |
| (ChatGPT) The developer mode toggle is missing | On a work or school account an admin may have disabled it org-wide. Free accounts are not eligible. |
| (ChatGPT) Connected, but answers ignore the database | You must pick h2-bench under + → Developer mode in each conversation. |